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Cloning and comparison of xylanase genes from ruminal and colonicBacteroides species

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Abstract

The gene encoding xylanase activity in the ruminal bacteriumBacteroides ruminicola D31d was cloned and expressed inEscherichia coli with the plasmid vector pUC18. The gene was isolated on a 4.7-kilobase pair partialPstI genomic DNA fragment. The xylanase activity expressed inE. coli was cell associated and could degrade both oatspelt xylan and Remazol Brilliant Blue-xylan. The xylanase did not have detectable activity against carboxymethylcellulose. Utilization of an endogenous promoter byE. coli was indicated by expression of xylanase activity after subcloning of the insert into pBR322 in opposite orientations. TheB. ruminicola D31d xylanase gene was compared by Southern hybridization analyses with xylanase genes cloned fromB. ruminocola 23 andB. ovatus V975, a human intestinal isolate. The D31d xylanase gene did not cross-hybridize with either of the other two genes. In addition, the 23 xylanase gene did not cross-hybridize with the other two genes according to the same technique. These results indicate that the three cloned genes do not share a high degree of genetic similarity, despite the similar enzymatic activities. This is the first study to compare cloned genes from ruminal and colonicBacteroides species.

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  1. Agricultural Research Service, Fermentation Biochemistry Research Unit, Northern Regional Research Center, USDA, 1815 N. University Street, 61604, Peoria, IL, USA

    Terence R. Whitehead & David A. Lee

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  1. Terence R. Whitehead
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  2. David A. Lee
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The mention of firm names or trade products does not imply that they are endorsed or recommended by the U.S. Department of Agriculture over other firms or similar products not mentioned.

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Whitehead, T.R., Lee, D.A. Cloning and comparison of xylanase genes from ruminal and colonicBacteroides species. Current Microbiology 23, 15–19 (1991). https://doi.org/10.1007/BF02092303

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