Abstract
Fibronectin type III (FNIII) domains were first identified in the eukaryotic plasma protein fibronectin, where they act as structural spacers or enable protein-protein interactions. Recently we characterized two large and multi-domain amylases in Microbacterium aurum B8.A that both carry multiple FNIII and carbohydrate binding modules (CBMs). The role of (multiple) FNIII domains in such carbohydrate acting enzymes is currently unclear. Four hypothetical functions are considered here: a substrate surface disruption domain, a carbohydrate binding module, as a stable linker, or enabling protein-protein interactions. We performed a phylogenetic analysis of all FNIII domains identified in proteins listed in the CAZy database. These data clearly show that the FNIII domains in eukaryotic and archaeal CAZy proteins are of bacterial origin and also provides examples of interkingdom gene transfer from Bacteria to Archaea and Eucarya. FNIII domains occur in a wide variety of CAZy enzymes acting on many different substrates, suggesting that they have a non-specific role in these proteins. While CBM domains are mostly found at protein termini, FNIII domains are commonly located between other protein domains. FNIII domains in carbohydrate acting enzymes thus may function mainly as stable linkers to allow optimal positioning and/or flexibility of the catalytic domain and other domains, such as CBM.
References
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