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. 1986 Feb;165(2):612–619. doi: 10.1128/jb.165.2.612-619.1986

Cloning of the Bacillus subtilis DLG beta-1,4-glucanase gene and its expression in Escherichia coli and B. subtilis.

L M Robson, G H Chambliss
PMCID: PMC214463  PMID: 3003033

Abstract

The gene encoding beta-1,4-glucanase in Bacillus subtilis DLG was cloned into both Escherichia coli C600SF8 and B. subtilis PSL1, which does not naturally produce beta-1,4-glucanase, with the shuttle vector pPL1202. This enzyme is capable of degrading both carboxymethyl cellulose and trinitrophenyl carboxymethyl cellulose, but not more crystalline cellulosic substrates (L. M. Robson and G. H. Chambliss, Appl. Environ. Microbiol. 47:1039-1046, 1984). The beta-1,4-glucanase gene was localized to a 2-kilobase (kb) EcoRI-HindIII fragment contained within a 3-kb EcoRI chromosomal DNA fragment of B. subtilis DLG. Recombinant plasmids pLG4000, pLG4001a, pLG4001b, and pLG4002, carrying this 2-kb DNA fragment, were stably maintained in both hosts, and the beta-1,4-glucanase gene was expressed in both. The 3-kb EcoRI fragment apparently contained the beta-1,4-glucanase gene promoter, since transformed strains of B. subtilis PSL1 produced the enzyme in the same temporal fashion as the natural host B. subtilis DLG. B. subtilis DLG produced a 35,200-dalton exocellular beta-1,4-glucanase; intracellular beta-1,4-glucanase was undetectable. E. coli C600SF8 transformants carrying any of the four recombinant plasmids produced two active forms of beta-1,4-glucanase, an intracellular form (51,000 +/- 900 daltons) and a cell-associated form (39,000 +/- 400 daltons). Free exocellular enzyme was negligible. In contrast, B. subtilis PSL1 transformed with recombinant plasmid pLG4001b produced three distinct sizes of active exocellular beta-1,4-glucanase: approximately 36,000, approximately 35,200, and approximately 33,500 daltons. Additionally, B. subtilis PSL1(pLG4001b) transformants contained a small amount (5% or less) of active intracellular beta-1,4-glucanase of three distinct sizes: approximately 50,500, approximately 38,500 and approximately 36,000 daltons. The largest form of beta-1,4-glucanase seen in both transformants may be the primary, unprocessed translation product of the gene.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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