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J Bacteriol. 1990 July; 172(7): 3837-3841

research-article

DNA sequence of a Fibrobacter succinogenes mixed-linkage beta-glucanase (1,3-1,4-beta-D-glucan 4-glucanohydrolase) gene.

Animal Research Centre, Research Branch, Agriculture Canada, Ottawa, Ontario.

ABSTRACT

The DNA sequence of a mixed-linkage beta-glucanase (1,3-1,4-beta-D-glucan 4-glucanohydrolase [EC 3.2.1.73]) gene from Fibrobacter succinogenes cloned in Escherichia coli was determined. The general features of this gene are very similar to the consensus features for other gram-negative bacterial genes. The gene product was processed for export in E. coli. There is a high level of sequence homology between the structure of this glucanase and the structure of a mixed-linkage beta-glucanase from Bacillus subtilis. The nonhomologous region of the amino acid sequence includes a serine-rich region containing five repeats of the sequence Pro-Xxx-Ser-Ser-Ser-Ser-(Ala or Val) which may be functionally related to the serine-rich region observed in Pseudomonas fluorescens cellulase and the serine- and/or threonine-rich regions observed in Cellulomonas fimi endoglucanase and exoglucanase, in Clostridium thermocellum endoglucanases A and B, and in Trichoderma reesei cellobiohydrolase I, cellobiohydrolase II, and endoglucanase I.

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