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Appl Environ Microbiol. 1990 October; 56(10): 3204-3208

Genes from Cellvibrio mixtus encoding beta-1,3 endoglucanase.

Department of Microbiology, University of Queensland, St. Lucia, Australia.

ABSTRACT

Two genes encoding beta-1,3 glucanase activity were cloned from the gram-negative soil bacterium Cellvibrio mixtus. The two clones, designated cwd (cell wall degradation) and lam (laminarin degradation), had distinct endonuclease restriction patterns and encoded enzymes with distinct substrate specificities. The 3.7-kilobase cwd insert encoded an enzyme which degraded yeast cell walls as well as the soluble beta-1,3 glucan laminarin and the insoluble beta-1,3 glucans zymosan and pachyman. The 1.8-kilobase lam insert encoded an enzyme which degraded laminarin only. Both enzymes degraded laminarin in an endohydrolytic manner to yield laminarobiose, laminarotriose, and laminarotetraose as major end products. Radiolabeled translation products of the cwd and lam transcripts were identified.

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