期刊
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
卷 74, 期 1, 页码 113-124出版社
SPRINGER
DOI: 10.1007/s00253-006-0645-6
关键词
metagenomics; environmental DNA; glucanase; mannanase; xylanase; multidomain
资金
- Biotechnology and Biological Sciences Research Council [D19624] Funding Source: researchfish
- Biotechnology and Biological Sciences Research Council [D19624] Funding Source: Medline
A unique multifunctional glycosyl hydrolase was discovered by screening an environmental DNA library prepared from a microbial consortium collected from cow rumen. The protein consists of two adjacent catalytic domains. Sequence analysis predicted that one domain conforms to glycosyl hydrolase family 5 and the other to family 26. The enzyme is active on several different beta-linked substrates and possesses mannanase, xylanase, and glucanase activities. Site-directed mutagenesis studies on the catalytic residues confirmed the presence of two functionally independent catalytic domains. Using site-specific mutations, it was shown that one catalytic site hydrolyzes beta-1,4-linked mannan substrates, while the second catalytic site hydrolyzes beta-1,4-linked xylan and beta-1,4-linked glucan substrates. Polysaccharide Analysis using Carbohydrate gel Electrophoresis (PACE) also confirmed that the enzyme has discrete domains for binding and hydrolysis of glucan- and mannan-linked polysaccharides. Such multifunctional enzymes have many potential industrial applications in plant processing, including biomass saccharification, animal feed nutritional enhancement, textile, and pulp and paper processing.
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