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Open Life Sciences

formerly Central European Journal of Biology

Editor-in-Chief: Ratajczak, Mariusz

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Volume 7, Issue 4


Volume 10 (2015)

Gene expression and activity analysis of the first thermophilic U32 peptidase

Andrius Jasilionis / Algirdas Kaupinis / Marija Ger / Mindaugas Valius / Donaldas Chitavichius / Nomeda Kuisiene
Published Online: 2012-06-03 | DOI: https://doi.org/10.2478/s11535-012-0047-y


Peptidase family U32 is one of the few whose catalytic type and structure has not yet been described. It is generally accepted that U32 peptidases represent putative collagenases and contribute to the pathogenicity of some bacteria. Meanwhile, U32 peptidases are also found in nonpathogenic bacteria including thermophiles and hyperthermophiles. Here we report cloning of the U32.002 peptidase gene from thermophilic Geobacillus thermoleovorans DSM 15325 and demonstrate expression and characterization of the recombinant protein. It has been determined that U32.002 peptidase is constitutively expressed in the cells of thermophilic G. thermoleovorans DSM 15325. The recombinant oligomeric enzyme showed its activity only against heat-treated collagen. It was unable to degrade albumin, casein, elastin, gelatine and keratin. In contrast to this, the monomeric recombinant protein showed no activity at all. This paper is the first report about the thermophilic U32 peptidase. As the thermophilic bacteria are non-pathogenic, the role of constitutively expressed extracellular collagenolytic U32 peptidase in these bacteria is unclear.

Keywords: Constitutive expression; Collagenolytic activity; Thermophilic collagenase; Geobacillus thermoleovorans; Geobacillus lituanicus

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About the article

Published Online: 2012-06-03

Published in Print: 2012-08-01

Citation Information: Open Life Sciences, Volume 7, Issue 4, Pages 587–595, ISSN (Online) 2391-5412, DOI: https://doi.org/10.2478/s11535-012-0047-y.

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© 2012 Versita Warsaw. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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