基因
大肠杆菌
生物
PBR322电话
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分子生物学
分子克隆
序列分析
遗传学
基因表达
肽序列
作者
Ernst Lüthi,Nila Bhana Jasmat,R A Grayling,Donald R. Love,Peter L. Bergquist
标识
DOI:10.1128/aem.57.3.694-700.1991
摘要
A lambda recombinant phage expressing beta-mannanase activity in Escherichia coli has been isolated from a genomic library of the extremely thermophilic anaerobe "Caldocellum saccharolyticum." The gene was cloned into pBR322 on a 5-kb BamHI fragment, and its location was obtained by deletion analysis. The sequence of a 2.1-kb fragment containing the mannanase gene has been determined. One open reading frame was found which could code for a protein of Mr 38,904. The mannanase gene (manA) was overexpressed in E. coli by cloning the gene downstream from the lacZ promoter of pUC18. The enzyme was most active at pH 6 and 80 degrees C and degraded locust bean gum, guar gum, Pinus radiata glucomannan, and konjak glucomannan. The noncoding region downstream from the mannanase gene showed strong homology to celB, a gene coding for a cellulase from the same organism, suggesting that the manA gene might have been inserted into its present position on the "C. saccharolyticum" genome by homologous recombination.
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