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. 1995 May;177(9):2543–2549. doi: 10.1128/jb.177.9.2543-2549.1995

Comparative analyses reveal a highly conserved endoglucanase in the cellulolytic genus Fibrobacter.

C Lin 1, D A Stahl 1
PMCID: PMC176915  PMID: 7730288

Abstract

An RNA probe complementary to the endoglucanase 3 gene (cel-3) of Fibrobacter succinogenes S85 hybridized to chromosomal DNAs from isolates representing the genetic diversity of the genus. The probe was subsequently used to identify putative cel-3-containing clones from genomic libraries of representative Fibrobacter isolates. Comparative sequence analyses of the cloned cel-3 genes confirmed that cel-3 is conserved among Fibrobacter isolates and that the ancestral cel-3 gene appears to have coevolved with the genus, since the same genealogy was inferred from sequence comparisons of 16S rRNAs and cel-3 genes. Hybridization comparisons using a xylanase gene probe suggested similar conservation of this gene. Together the data indicate that the cellulolytic apparatus is conserved among Fibrobacter isolates and that comparative analyses of homologous elements of the apparatus from different members, in relationship to the now established phylogeny of the genus, could serve to better define the enzymatic basis of fiber digestion in this genus.

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Selected References

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