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The distribution of two xylanase genes was examined by Southern hybridization among 26 strains of the rumen anaerobic bacterium Prevotella (Bacteroides) ruminicola. Hybridization with a xylanase/endoglucanase gene from the type strain 23 was found in six strains while hybridization with a xylanase gene from strain D31d was found in 14 strains. Sequences related to both genes were present, on different restriction fragments, in six strains, whereas no hybridization to either gene was detected in five other strains capable of hydrolysing xylan, or in seven strains that showed little or no xylanase activity. Zymogram analyses of seven xylanolytic strains of P. ruminicola demonstrated interstrain variation in the apparent molecular masses of the major xylanases and carboxymethylcellulases that could be renatured following SDS polyacrylamide gel electrophoresis.

Distribution of xylanase genes and enzymes among strains of Prevotella (Bacteroides) ruminicola from the rumen