کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2092879 1081826 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Isolation and characterization of novel cellulase genes from uncultured microorganisms in different environmental niches
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی بیوتکنولوژی یا زیست‌فناوری
پیش نمایش صفحه اول مقاله
Isolation and characterization of novel cellulase genes from uncultured microorganisms in different environmental niches
چکیده انگلیسی

SummaryFour different environmental DNA libraries were prepared from microbial consortium collected from forest soil, dung of elephant, cow rumen and rotted tree. Seven independent clones specifying cellulase activities (five endo-β-1,4-glucanases and two β-glucosidases) were isolated and identified. Sequence analysis of the retrieved genes revealed that the encoded products of these cellulase genes shared less than 50% identities and 70% similarities to cellulases in the databases. Domain analysis predicted that four endo-β-1,4-glucanases conform to glycolsyl hydrolase family 5 (GHF 5) and one endo-β-1,4-glucanase to glycolsyl hydrolase family 9 (GHF 9), while both β-glucosidases belong to glycolsyl hydrolase family 3 (GHF 3). Further sequence analysis indicated that although a solid affiliation could be made for the two endo-β-1,4-glucanases to the typical ruminal microbe Prevotella ruminicola, the rest formed deep-branched lineages with no close relatives. The revelation of the phylogenetic novelty provided a snapshot on the great diversity of cellulases in these natural environments.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Microbiological Research - Volume 164, Issue 6, 29 November 2009, Pages 650–657
نویسندگان
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