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The xynC gene of Fibrobacter succinogenes S85 codes for a 66.4-kDa xylanase which consists of three distinct domains separated by two flexible regions rich in serine residues. Domains A and B of XynC code for catalytic domains with 56.5% identity and 9.6% similarity with each other, and both domains share homology with xylanases of Ruminococcus flavefaciens, Neocallimastix patriciarum, Clostridium acetobutylicum, Bacillus pumilus, Bacillus subtilis, and Bacillus circulans. More than 88% of the xylanase activity of Escherichia coli cells carrying the original 13-kb recombinant plasmid was released from intact cells by cold water washes. The major products of hydrolysis of xylan by both domains were xylose and xylobiose, indicating that the xynC gene product exhibits catalytic properties similar to those of the XynA xylanases from R. flavefaciens and N. patriciarum. So far, these features are not shared broadly with bacteria from other environments and may indicate specific selection for this domain structure in the highly competitive environment of the rumen.

The xynC gene from Fibrobacter succinogenes S85 codes for a xylanase with two similar catalytic domains