Published by De Gruyter

Volume 62 Issue 1-2

Issue of Zeitschrift für Naturforschung C

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Journal Overview

Open Access June 2, 2014

Simultaneous Identification and Determination of Major Taxoids from Extracts of Taxus chinensis Cell Cultures

Chun F. Zhao, Long J. Yu, Li Q. Li, Fu Xiang

Page range: 1-10

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Abstract

Liquid chromatography electrospray ionization tandem mass spectrometry (LC/ESI-MS/ MS) and high-performance liquid chromatography (HPLC) methods have been used to identify and quantify the major taxoids from extracts of Taxus chinensis cell cultures. Chromatography was carried out on a reverse phase C18 column with isocratic-mode elution. By analytically comparing LC/ESI-MS/MS of the extracts with that of the available reference substances and literature, six taxoids were identified as taxuyunnanine C (Tc, 1), yunnanxane (2), 2α,5α,10β-triacetoxy-14β-propionyloxytaxa-4(20),11-diene (3), 2α,5α,10β-triacetoxy-14β- (2-methyl)butyryloxytaxa-4(20),11-diene (4), taxol (5), and baccatin III (B III, 6), respectively. Among them, 2, 3 and 4 were assigned in the absence of the corresponding reference substances, and 3 and 4 were detected in this cell line for the first time. The identification was validated by NMR spectra. The precise quantification of 1 and 5 was made using HPLC. The limit of detection (LOD), 0.5 μg/ml for 5, 1.5 μg/ml for 1, and the linearity and accuracy of the quantitative method were evaluated, indicating a wide linear range and satisfactory accuracy. The amounts of other identified taxoids were calculated on the basis of comparison of the absolute response factors of similar structural substances. The proposed method provides a rapid, conventional and reliable tool to characterize and study cell lines for elucidating the taxane biosynthesis.

Open Access June 2, 2014

Phomopsidone, a Novel Depsidone from an Endophyte of the Medicinal Plant Eupatorium arnottianum

Janine Meister, Daniela Weber, Virginia Martino, Olov Sterner, Timm Anke

Page range: 11-15

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Abstract

The medicinal plant Eupatorium arnottianum can be found in the Northeast and center of Argentina and the South of Bolivia. From plant material collected in Argentina an endophytic Phomopsis was isolated. The fungus was identified by microscopic features and analysis of its ITS sequence. Cultures yielded, besides mellein and nectriapyrone, a novel depsidone derivative for which we propose the name phomopsidone (1). The structure of 1 was determined from its spectroscopic data.

Open Access June 2, 2014

Narcotic Alkaloids of Four Papaver Species from Iran

Peyman Salehi, Ali Sonboli, Alireza Fakhari Zavareh, Fatemeh Sefidkon, Bahram Cheraghi, Manijeh Dayeni

Page range: 16-18

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Abstract

Four native Papaver species of Iran, i. e. P. glaucum, P. tenuifolium, P. dubium and P. fugax, were collected from their natural habitat and subjected to HPLC analysis for determination of their morphine, codeine and thebaine content. P. dubium and P. glaucum contained all of the three mentioned narcotic alkaloids, while morphine was not found in P. fugax, and P. tenuifolium was free from codeine.

Open Access June 2, 2014

Antiviral and Antimicrobial Profiles of Selected Isoquinoline Alkaloids from Fumaria and Corydalis Species

Ilkay Orhan, Berrin Özçelik, Taner Karaoğlu, Bilge Şener

Page range: 19-26

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Abstract

In the current study, 33 isoquinoline alkaloids belonging to protopine-, benzylisoquinoline-, benzophenanthridine-, spirobenzylisoquinoline-, phthalideisoquinoline-, aporphine-, protoberberine-, cularine-, and isoquinolone-types as well as 7 derivatives of them obtained from some Fumaria and Corydalis species growing in Turkey have been evaluated for their in vitro antiviral and antimicrobial activities. Both DNA virus Herpes simplex (HSV) and RNA virus Parainfluenza (PI-3) were employed for antiviral assessment of the compounds using Madine- Darby bovine kidney and Vero cell lines and their maximum non-toxic concentrations (MNTC) and cytopathogenic effects (CPE) were determined using acyclovir and oseltamivir as the references. Antibacterial and antifungal activities of the alkaloids were tested against Escherichia coli, Pseudomonas aeruginosa, Proteus mirabilis, Klebsiella pneumoniae, Acinetobacter baumannii, Staphylococcus aureus, Bacillus subtilis, and Candida albicans by the microdilution method and compared to ampicilline, ofloxacine, and ketocanazole as the references. The alkaloids did not present any notable antibacterial effect, while they had significant antifungal activity at 8 μg/ml concentration. On the other hand, the alkaloids were found to have selective inhibition against the PI-3 virus ranging between 0.5 and 64 μg/ml as minimum and maximum CPE inhibitory concentrations, whereas they were completely inactive towards HSV.

Open Access June 2, 2014

New Anti-Inflammatory Agents

Mosaad S. Mohamed, Aymn E. Rashad, Mostafa Adbel-Monem, Samar S. Fatahalla

Page range: 27-31

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Abstract

The pyrrole derivatives 1a, b and 2a, b were used as precursors for the preparation of N-substituted pyrrole derivatives 3a, b-9a, b and pyrrolo[2,3-d]pyrimidines 13-16. Also, all the newly prepared products were tested for anti-inflammatory activity as analogues to fenamates, and some of them revealed moderate anti-inflammatory activity compared to the standard drug indomethacin.

Open Access June 2, 2014

Polyphenols of Rosa L. Leaves Extracts and their Radical Scavenging Activity

Renata Nowak, Urszula Gawlik-Dziki

Page range: 32-38

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Abstract

Antioxidant potential of Rosa L. leaves methanolic extracts was evaluated in vitro using a spectrophotometric method based on measuring the radical scavenging effect on 2,2-diphenyl- 1-picrylhydrazyl (DPPH) radicals. The contents of ellagic acid, quercetin and kaempferol in the extracts from leaves of seventeen rose species were determined using SPE-RPHPLC methods. Additionally, total phenolic content was determined spectrophotometrically according to the Folin-Ciocalteu procedure and calculated as gallic acid equivalents (GAE). Remarkable high antioxidant activity and high total phenolic content (5.7% < GAE < 15.2%), large ellagic acid (EA) content from 9.37 to 19.42 mg/g of dry weight, a quercetin content ranging from 3.68 to 15.81 mg/g of dry weight and kaempferol content from 1.25 to 9.41mg/g of dry weight were found in rose leaves. Significant correlation between EA (r 2 = 0.6131), quercetin (r 2 = 0.5158), total phenolic content (r 2 = 0.8485) and antioxidant activity was observed. Basing on the studies conducted one may assume that the extracts of rose leaves are a rich source of natural antioxidants and could be used to prevent free-radical-induced deleterious effects.

Open Access June 2, 2014

Antinociceptive Activity of Structural Analogues of Rotundifolone: Structure-Activity Relationship

Damião P. de Sousa, Edison V. M. Júnior, Fernando S. Oliveira, Reinaldo N. de Almeida, Xirley P. Nunes, José M. Barbosa-Filho

Page range: 39-42

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Abstract

Rotundifolone, a monoterpene isolated from the essential oil of the leaves of Mentha x villosa, is a constituent of several essential oils and known to have antinociceptive activity. Our recent study demonstrated that the analogues of rotundifolone showed also a significant antinociceptive effect. In the present report, to investigate the correlation between the structure and antinociceptive activity, rotundifolone and its analogues were evaluated in the acetic acid-induced writhing test in mice. All compounds showed to be more antinociceptive than rotundifolone against the pain response induced by acetic acid. Comparing the antinociceptive effect of rotundifolone with limonene oxide and (+)-pulegone, the results demonstrated that the epoxide group contributes as much as the ketone group to the antinociceptive activity of rotundifolone. Similarly, pulegone oxide and carvone epoxide were more antinociceptive than rotundifolone, thereby suggesting that the position of the functional group on the ring also influences the antinociceptive activity. (D)-Carvone produced maximal inhibition of the writhing response and was slightly more active than (+)-carvone. The study showed that by appropriate structural modification it may be possible to develop novel antinociceptive agents.

Open Access June 2, 2014

Root Cultures of Linum Species Section Syllinum as Rich Sources of 6-Methoxypodophyllotoxin

Abdolali Mohagheghzadeh, Azra Gholami, Shiva Hemmati, Mohammad Reza Shams Ardakani, Thomas J. Schmidt, A. Wilhelm Alfermann

Page range: 43-49

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Abstract

Linum spp. from section Syllinum are promising for the production of aryltetralin lignans like podophyllotoxin (PTOX) and 6-methoxypodophyllotoxin (MPTOX). MPTOX is a PTOX congener that has cytotoxic activity comparable with PTOX. In this study root cultures of Linum Bungei from section Dasyllinum, L. strictum from section Linastrum, L. album, L. mucronatum ssp. mucronatum and L. nodiflorum from section Syllinum were established and their MPTOX levels were investigated in 1000 ml flasks. Root cultures of L. mucronatum ssp. mucronatum and L. nodiflorum were used to examine cell growth and production of MPTOX during a culture period of 36 days in 250 ml flasks. Considerable amounts of MPTOX in root cultures (1000 ml flasks) of L. album (6 mg/100 g DW), L. mucronatum ssp. mucronatum (770 mg/100 g DW) and L. nodiflorum (91 mg/100 g DW) were detected while it wasn’t detected in root cultures of L. Bungei and L. strictum. In time course experiments, the maximum amount of MPTOX in L. nodiflorum root culture was at day 16 with 480 mg/ 100 g DW and the maximum amount of MPTOX in L. mucronatum ssp. mucronatum root culture was at day 12 with 130 mg/100 g DW. The results showed that root cultures of Linum species from section Syllinum are rich sources of MPTOX and since this lignan has remarkable cytotoxic activity, it can be used as a precursor for the production of antitumor agents.

Open Access June 2, 2014

Induction of Phenolic Compounds in Wheat (Triticum aestivum L.) Tissue Cultures by Streptomycin

Atiat M. A. Hassan

Page range: 50-54

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Abstract

The tissue cultures of wheat (Triticum aestivum L.) were induced from the mature embryos (explants) of the dry grains and grown on MS medium containing kinetin (0.1 mg/l) and 2,4 D (1.0 mg/l). The cultures were incubated for two weeks at (25 ± 2) °C under a light/dark regime (16 h light daily). The formed calli were subcultured at the beginning of the stationary growth phase (15 days) with fresh MS medium containing 0, 5, 10, 25, 50, 100, 150 mg/l streptomycin elicitor and maintained for two weeks for three subcultures. A significant increase in phenylalanine ammonia lyase (PAL) activity coincided with the increase of the total phenolic compounds after elicitation with streptomycin. Maximum induction was recorded during the first two weeks, then gradually declined during the rest of the experimental period, but the values attained were still markedly higher than that of the control. The endogenous cinnamic acid content was also increased significantly with the increase in PAL activity making about 2-18% of the total phenolic acids. The growth and accumulation of phenolic compounds were inversely related. However, accumulation of phenolic compounds became limited for growth of wheat tissue culture especially during the long term cultivation.

Open Access June 2, 2014

The Influence of Plant Hormones on Phospholipid Monolayer Stability

Barbara Gzyl-Malcher, Maria Filek, Gerald Brezesinski, Antje Fischer

Page range: 55-60

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Abstract

The influence of hormones in water subphase on the stability of monolayers built of phospholipid mixtures extracted from embryogenic (PLE) and nonembryogenic (PLNE) wheat calli was examined. Additionally, experiments on individual lipids, dipalmitoylphosphatidylcholine (DPPC) and dipalmitoylphosphatidic acid (DPPA), were performed. DPPC was chosen because it was the main phospholipid present in both calli. Negatively charged DPPA could mimic a negatively charged natural mixture of lipids. As hormones, auxins (IAA and 2,4-D), cytokinins (zeatin and kinetin) and zearalenone were chosen. The time of monolayer stability for PLNE calli was much longer than for PLE calli. Kinetics of monolayer stability of PLNE was similar to DPPA, whereas that of PLE was similar to DPPC. Generally, hormones increased the time after which the monolayer stability was reached and decreased the surface pressure. The greatest effect was observed for auxins (especially IAA), whereas cytokinins affected the monolayer stability to a lesser degree.

Open Access June 2, 2014

Scoparone Inhibits Ultraviolet Radiation-Induced Lipid Peroxidation

Paul Sourivong, Kristina Schronerová, Melánia Babincová

Page range: 61-64

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Abstract

Antioxidant capabilities of scoparone, the component of Artemisia scoparia and other medicinal plants, against lipid peroxidation induced by ultraviolet radiation or Fenton reaction have been analyzed. Lipid peroxidation was monitored by measuring the absorption spectra of the conjugated dienes and quantified by the Klein oxidation index. Obtained results imply that scoparone is a very efficient inhibitor of ultraviolet radiation-induced lipid peroxidation and damage.

Open Access June 2, 2014

Ultracytochemical Localization of Acid Phosphatase in Humicola lutea Conidia and Mycelia

Dimitrina Spasova, Penka Aleksieva, Lilyana Nacheva, Spasimira Radoevska

Page range: 65-69

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Abstract

Electron microscopic cytochemical procedures were used to determine the cellular location of acid phosphatase in the fungus Humicola lutea grown in casein-containing medium lacking in mineral orthophosphates. In our investigations acid phosphatase in nongerminating conidia was localized on the outer side of the cell wall, in the cell wall, and on the exterior surface of the plasma membrane. The reaction product of acid phosphatase in germinating conidia was seen in the outer wall layer while in young mycelium on the cell surface and in the exocellular space. The relationship between phosphatase activities localized in the cell wall and their role in the enzymatic degradation of the phosphoprotein casein providing available phosphates for cell growth is discussed.

Open Access June 2, 2014

Effect of Copper on Acid Phosphatase Activity in Yeast Yarrowia lipolytica

Hiroyasu Ito, Masahiro Inouhe, Hiroshi Tohoyama, Masanori Joho

Page range: 70-76

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Abstract

Acid phosphatase (APase) activity of the yeast Yarrowia lipolytica increased with increasing Cu 2+ concentrations in the medium. Furthermore, the enzyme in soluble form was stimulated in vitro by Cu 2+ , Co 2+ , Ni 2+ , Mn 2+ and Mg 2+ and inhibited by Ag + and Cd 2+ . The most effective ion was Cu 2+ , especially for the enzyme from cultures in medium containing Cu 2+ , whereas APase activity in wall-bound fragments was only slightly activated by Cu 2+ . The content of cellular phosphate involving polyphosphate was decreased by adding Cu 2+ , regardless of whether or not the medium was rich in inorganic phosphate. Overproduction of the enzyme stimulated by Cu 2+ might depend on derepression of the gene encoding the APase isozyme.

Open Access June 2, 2014

Copper Extrusion after Accumulation during Growth of Copper-Tolerant Yeast Yarrowia lipolytica

Hiroyasu Ito, Masahiro Inouhe, Hiroshi Tohoyama, Masanori Joho

Page range: 77-82

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Abstract

The Cu 2+ -tolerant yeast Yarrowia lipolytica accumulated Cu 2+ until the late logarithmic phase. Thereafter, Cu 2+ was temperature-dependently extruded into phosphate-limited culture medium containing high concentrations of heavy metal ions but not into 10 mm 2-(Nmorpholino) ethane sulfonic acid (MES) buffer (pH 6.0). Peptone in the culture medium played an important role in the extrusion, which proceeded even when peptone was substituted with cysteine or histidine, but not with any other amino acid tested.

Open Access June 2, 2014

Influence of Various Phenolic Compounds on Phenol Hydroxylase Activity of a Trichosporon cutaneum Strain

Maria Gerginova, Jordan Manasiev, Nedka Shivarova, Zlatka Alexieva

Page range: 83-86

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Abstract

The phenol-degrading strain Trichosporon cutaneum R57 utilizes various aromatic and aliphatic compounds as a sole carbon and energy source. The intracellular activities of phenol hydroxylase [EC 1.14.13.7] of a Trichosporon cutaneum R57 strain grown on phenol (0.5 g/l) were measured. Different toxic phenol derivatives (cresols, nitrophenols and hydroxyphenols) were used as substrates in the reaction mixture for determination of the enzyme activity. The data obtained showed that the investigated enzyme was capable to hydroxylate all applied aromatic substrates. The measured activities of phenol hydroxylase varied significantly depending on the aromatic compounds used as substrates. The rate of phenol hydroxylase activity with phenol as a substrate (1.0 U/mg total cell protein) was accepted as 100%.

Open Access June 2, 2014

Bacterial Decolorization of Acid Orange 7 in the Presence of Ionic and Non-Ionic Surfactants

Tatyana Avramova, Lilyana Stefanova, Blaga Angelova, Sava Mutafov

Page range: 87-92

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Abstract

The effects of the non-ionic surfactant Triton ® X-100, the cationic surfactant cetyltrimethylammonium bromide (CTAB) and the anionic surfactant sodium N-lauroyl sarcosinate (SLS) on the decolorization of the reaction medium containing the monoazo dye Acid Orange 7 (AO7) by Alcaligenes faecalis and Rhodococcus erythropolis were studied. It was found that the surfactants influenced in different ways the rate of decolorization. At all concentrations tested the non-ionic surfactant Triton X-100 decreased the decolorization rate of R. erythropolis. At concentrations above the critical micelle concentration (CMC) Triton X-100 upset the usually observed exponential decay of the dye with A. faecalis due probably to the existence of an outer membrane in this organism. In concentrations above the CMC the anionic surfactant SLS inhibited the decolorization and, at prolonged incubation, caused partial release of the bound dye. The cationic surfactant CTAB in concentrations above and below the CMC accelerated drastically the binding of AO7 to the cells causing a rapid staining of the biomass and complete decolorization of the reaction medium. An attempt was made for explanation of the observed differences by the negative electrostatic charge of the living bacterial cell.

Open Access June 2, 2014

Inhibition of Anodic Galvanotaxis of Green Paramecia by T-Type Calcium Channel Inhibitors

Miki Aonuma, Takashi Kadono, Tomonori Kawano

Page range: 93-102

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Abstract

Calcium ion (Ca 2+ ) is one of the key regulatory elements for ciliary movements in the Paramecium species. It has long been known that members of Paramecium species including green paramecia (Paramecium bursaria) exhibit galvanotaxis which is the directed movement of cells toward the anode by swimming induced in response to an applied voltage. However, our knowledge on the mode of Ca 2+ action during green paramecia anodic galvanotactic response is still largely limited. In the present study, quantification of anodic galvanotaxis was carried out in the presence and absence of various inhibitors of calcium signaling and calcium channels. Interestingly, galvanotactic movement of the cells was completely inhibited by a variety of Ca 2+ -related inhibitors. Such inhibitors include a Ca 2+ chelator (EGTA), general calcium channel blockers (such as lanthanides), inhibitors of intracellular Ca 2+ release (such as ruthenium red and neomycin), and inhibitors of T-type calcium channels (such as NNC 55-0396, 1-octanol and Ni 2+ ). However, L-type calcium channel inhibitors such as nimodipine, nifedipine, verapamil, diltiazem and Cd 2+ showed no inhibitory action. This may be the first implication for the involvement of T-type calcium channels in protozoan cellular movements.

Open Access June 2, 2014

Isolation and Identification of Potential Phosphate Solubilizing Bacteria from the Rhizoplane of Oryza sativa L. cv. BR29 of Bangladesh

Md. Tofazzal Islam, Abhinandan Deora, Yasuyuki Hashidoko, Atiqur Rahman, Toshiaki Ito, Satoshi Tahara

Page range: 103-110

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Abstract

A total of 30 bacteria were isolated from the rhizoplane of rice cv. BR29 cultivated in Mymensingh, Bangladesh and from the seedlings obtained from surface-sterilized seeds of BR29. Upon screening, 6 isolates showed varying levels of phosphate solubilizing activity in both agar plate and broth assays using National Botanical Research Institute’s phosphate medium. The bacterial isolates were identified based on their phenotypic and 16S rRNA genes sequencing data as Acinetobacter sp. BR-12, Klebsiella sp. BR-15, Acinetobacter sp. BR-25, Enterobacter sp. BR-26, Microbacterium sp. BRS-1 and Pseudomonas sp. BRS-2. The BR-25 exhibited highest phosphate solubilizing activity followed by BR-15. They grew rapidly in the liquid medium at pH 5 and 7 but almost no growth occurred at pH 3. The pH value of the culture medium was decreased with bacterial growth suggesting that they might secrete organic acids to solubilize insoluble phosphorus. Scanning electron microscope analysis of two-week-old rice seedlings germinated from seeds previously inoculated with BR-25 and BR-15 revealed dense colonization at the root surfaces presumably using fimbriae on the bacterial cells.

Open Access June 2, 2014

Excess Boron Reduces Polyphenol Oxidase Activities in Embryo and Endosperm of Maize Seed during Germination

Hülya Ölçer, İsmail Kocaçalışkan

Page range: 111-115

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Abstract

The effects of increasing concentrations of boron (0, 0.1, 1, 10 and 20 mм) as boric acid on the rate of germination and polyphenol oxidase activities in embryo and endosperm tissues of maize seeds (Zea mays L. cv. Arifiye) were studied. The germination percentage of maize seeds was not affected by boron concentrations up to 10 mм, and decreased by 20 mм. Distilled water and lower boron concentrations (0.1 and 1 mм) increased polyphenol oxidase activities at the beginning of germination up to 12 h whereas its excess levels (10 and 20 mм) decreased polyphenol oxidase activities in embryos and endosperm during germination. Polyphenol oxidase activities with o-diphenolic substrates (caffeic acid, catechol and dopa) were found to be higher than with a monophenolic substrat (tyrosine) in both embryos and endosperms. Further, caffeic acid oxidizing polyphenol oxidase was found to show more activity in embryos of the seeds germinating in distilled water when compared to other substrates.

Open Access June 2, 2014

Genetic Variability and Relationships among Thirty Genotypes of Finger Millet (Eleusine coracana L. Gaertn.) Using RAPD Markers

Swanalata Das, Rama Chandra Mishra, Gyana Ranjan Rout, Subhashree Aparajita

Page range: 116-122

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Abstract

Ragi or finger millet (Eleusine coracana L.) is an important crop used for food, forage, and industrial products. It is distributed in tropical and temperate regions of the world. The germplasm identification and characterization is an important link between the conservation and utilization of plant genetic resources. Traditionally, species or varieties identification has relied on morphological characters like growth habit, leaf architecture or floral morphology. Investigation through RAPD (random amplified polymorphic DNA) markers was undertaken for identification and determination of the genetic variation among thirty genotypes of ragi of the family Poaceae. Thirteen selected decamer primers were used for genetic analysis. A total of 124 distinct DNA fragments ranging from 300-3000 bp was amplified by using selected random RAPD marker. The genetic similarity was evaluated on the basis of the presence or absence of bands. Cluster analysis was made by the similarity coefficient. It indicated that the 30 genotypes of ragi form two major clusters, first, a major cluster having only one genotype, i. e. Dibyasinha and a second major cluster having twenty-nine genotypes. The second major cluster again subdivides into two minor clusters. A first minor cluster has only three varieties, i. e. Neelachal, OEB-56 and Chilika. The genotypes Neelachal and OEB- 56 exhibit a 86% similarity with each other and 80% similarity with Chilika. A second minor cluster has 26 genotypes and is divided into two sub-minor clusters. The first sub-minor cluster has only one genotype (VL-322). The second sub-minor cluster again subdivides into two groups. One group has one genotype and the second group again is divided into two sub-groups, one with 13 genotypes and the other with 11 genotypes. The highest similarity coefficient was detected in a genotype collected from southern India and the least from northern India. The genotypes of finger millet collected from diverse agroclimatic regions of India constitute a wide genetic base. This is helpful in breeding programs and a major input into conservation biology of cereal crop.

Open Access June 2, 2014

Nuclear-Localized Plastid DNA Fragments in Protozoa, Metazoa and Fungi

Shu Yuan, Xin Sun, Lin-Chun Mu, Wen-Juan Liu, Tao Lei, Jian-Hui Wang, Jun-Bo Du, Hong-Hui Lin

Page range: 123-132

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Abstract

We analyzed nuclear-localized plastid-like DNA (nupDNA) fragments in protozoa, metazoa and fungi. Most eukaryotes that do not have plastids contain 40-5000 bp nupDNAs in their nuclear genomes. These nupDNA fragments are mainly derived from repeated regions of plastids and distribute through the whole genomes. A majority of nupDNA fragments is located on coding regions with very important functions. Similar to plastids, these nupDNAs most possibly originate from cyanobacteria. Analysis of them suggests that through millions of years of universal endosymbiosis and gene transfer they may have occurred in ancient protists before divergence of plants and animals/fungi, and some transferred fragments have been reserved till now even in modern mammals.

Open Access June 2, 2014

Binding of FKBP23 to BiP in ER Shown by Gel Filtration Chromatography

Chen Chen, Hui Ma, Huaifeng Mi, Ying Wang

Page range: 133-137

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Abstract

FKBP23 was found in mouse endoplasmic reticulum (ER) in 1998. It consists of an N-terminal peptidyl-prolyl cis/trans isomerase (PPIase) domain and a C-terminal domain with Ca 2+ binding sites. Previously, we reported that FKBP23 specifically binds to BiP, the main protein of the molecular chaperone Hsp70 in ER lumen, and the binding is interrelated with the Ca 2+ concentration. In this work we have found the existence of the complex FKBP23/BiP by separation of an ER extract using gel filtration chromatography (GFC), and that the existence of this complex is Ca 2+ -interrelated. This result further verified the Ca 2+ - interrelated binding of these two proteins in vivo.

Open Access June 2, 2014

Identification of Minor Sex Pheromone Components of the Poplar Clearwing Moth Paranthrene tabaniformis (Lepidoptera, Sesiidae)

Raimondas Mozūraitis, Vidmantas Karalius

Page range: 138-142

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Abstract

A chemical analysis of the crude sex pheromone gland extracts of virgin calling Paranthrene tabaniformis females, obtained from the European part of Kazakhstan, revealed the presence of five compounds: (3E,13Z)-octadeca-3,13-dien-1-ol (E3,Z13-18:OH), (3Z,13Z)- octadeca-3,13-dien-1-ol (Z3,Z13-18:OH), (2E,13Z)-octadeca-2,13-dien-1-ol (E2,Z13-18:OH), (13Z)-octadec-13-en-1-ol (Z13-18:OH), and octadecan-1-ol (18:OH) at the ratios 64.0 : 32.4 : 1.4 : 0.9 :1.3, which are structurally related to sex pheromone components of clearwing moths. Our previous field tests showed synergistic effects of Z3,Z13-18:OH and E2,Z13-18:OH to attract P. tabaniformis males, when these compounds were tested in binary mixtures with the known sex pheromone E3,Z13-18:OH. The three dienic alcohols should all be considered as sex pheromone components of the P. tabaniformis species, while the role of Z13-18:OH and 18:OH remained unclear.

Open Access June 2, 2014

Anisaldehyde, a Melanogenesis Potentiator

Teruhiko Nitoda, Maria D. Fan, Isao Kubo

Page range: 143-149

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Abstract

Anisaldehyde (4-methoxybenzaldehyde), previously reported as a tyrosinase inhibitor, did not inhibit melanogenesis in cultured B16-F10 melanoma cells but rather enhanced it. This adverse effect of anisaldehyde was accompanied by melanocytotoxicity in a dose-dependent manner up to 2 mм. The melanin content per cell at 1 mм was increased 5-fold compared to control and morphological observations showed the deposition of melanin pigments. Anisaldehyde was also examined against cultured human A375 melanoma cells.

Open Access June 2, 2014

New Findings about Ellman’s Method to Determine Cholinesterase Activity

Alena Komersová, Karel Komers, Alexandr Čegan

Page range: 150-154

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Abstract

The original Ellman’s spectrophotometrical method for cholinesterase activity determination uses 5,5′-dithiobis-2-nitrobenzoic acid (DTNB, Ellman’s reagent) as a chromogen and records the level of cholinesterase activity as an increase of absorbance at 412 nm. Although this procedure usually poses no problem, exceptions arise when the concentration of DTNB is far higher than the concentration of acetylthiocholine (ATCH). It was found that the ratio of concentrations of DTNB/ATCH is an important parameter for the ATCH hydrolysis course: high excess of DTNB decreases the hydrolysis rate resulting in a lower measured enzyme activity. Our experiments indicate that this influence of DTNB concentration can be explained by the inhibition of ATCH hydrolysis by DTNB.

About this journal

Objective

A Journal of Biosciences: Zeitschrift für Naturforschung C (ZNC) is an international scientific journal and a community resource for the emerging field of natural and natural-like products.

The journal publishes original research on the isolation (including structure elucidation), bio-chemical synthesis and bioactivities of natural products, their biochemistry, pharmacology, biotechnology, and their biological activity and innovative developed computational methods for predicting the structure and/or function of natural products.

A Journal of Biosciences: Zeitschrift für Naturforschung C (ZNC) welcomes research papers in fields on the chemistry-biology boundary which address scientific ideas and approaches to generate and understand natural compounds on a molecular level and/or use them to stimulate and manipulate biological processes.

Topics

Bio-chemical synthesis and bioactivities of natural products
Isolation (including structure elucidation)
Biochemistry
Biotechnology
Pharmacology
Chemistry
Biology

Article formats

Original research articles, research notes, letters and review articles

Please have a look at the call for papers for two upcoming Special Issues:

Special Issue on CAZymes

Special Issue on Chitin Structures and Pathways as Targets for Biopesticides and Drugs