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Molecular Cloning and Expression of a Novel β-Glucosidase Gene from Phialophora sp. G5.
MedLine Citation:
PMID:  23292244     Owner:  NLM     Status:  Publisher    
A novel β-glucosidase gene, bgl1G5, was cloned from Phialophora sp. G5 and successfully expressed in Pichia pastoris. Sequence analysis indicated that the gene consists of a 1,431-bp open reading frame encoding a protein of 476 amino acids. The deduced amino acid sequence of bgl1G5 showed a high identity of 85 % with a characterized β-glucosidase from Humicola grisea of glycoside hydrolase family 1. Compared with other fungal counterparts, Bgl1G5 showed similar optimal activity at pH 6.0 and 50 °C and was stable at pH 5.0-9.0. Moreover, Bgl1G5 exhibited good thermostability at 50 °C (6 h half-life) and higher specific activity (54.9 U mg(-1)). The K (m) and V (max) values towards p-nitrophenyl β-D-glucopyranoside (pNPG) were 0.33 mM and 103.1 μmol min(-1) mg(-1), respectively. The substrate specificity assay showed that Bgl1G5 was highly active against pNPG, weak on p-nitrophenyl β-D-cellobioside (pNPC) and p-nitrophenyl-β-D-galactopyranoside (ONPG), and had no activity on cellobiose. This result indicated Bgl1G5 was a typical aryl β-glucosidase.
Xuejun Li; Junqi Zhao; Pengjun Shi; Peilong Yang; Yaru Wang; Huiying Luo; Bin Yao
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-8
Journal Detail:
Title:  Applied biochemistry and biotechnology     Volume:  -     ISSN:  1559-0291     ISO Abbreviation:  Appl. Biochem. Biotechnol.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8208561     Medline TA:  Appl Biochem Biotechnol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute, Chinese Academy of Agricultural Sciences, No. 12 Zhongguancun South Street, Beijing, 100081, People's Republic of China.
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