Document Detail

Improvement of Vitreoscilla hemoglobin function by Bacillus licheformis glutamate-specific endopeptidase treatment.
MedLine Citation:
PMID:  22963793     Owner:  NLM     Status:  Publisher    
Vitreoscilla hemoglobin (VHb) was widely used in metabolic engineering to improve oxygen utilization in the low oxygen environment. It is sometimes necessary to remove affinity tags because they may impede functions of target proteins. Here we report an efficient method employing Glutamate-specific endopeptidase from Bacillus licheformis (GSE-BL) to perform the cleavage between VHb and His-tag. The optimal length of GSE-BL treatment was 15min. Results of SDS-PAGE and western blot demonstrated that the His-tag of VHb-His(6) was nearly completely removed, the purity of VHb was enhanced from 74% to 99.5%, and the yield of tagless VHb from VHb-His(6) was 92.2%. Results of CO difference spectrum suggested that tagless VHb was more prone to bind to CO compared with VHb-His(6). It was observed that tagless VHb displayed higher catalase activity than VHb-His(6). The enhancement of welan gum yield was more significant by addition of tagless VHb compared with addition of VHb-His(6). This method can be utilized to mass-produce tagless VHb, thus widening the application of VHb in various industries.
Wei Ye; Min Liu; Yi Ma; Haiying Wang; Xinhui Wang; Jufang Wang; Xiaoning Wang
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-31
Journal Detail:
Title:  Protein expression and purification     Volume:  -     ISSN:  1096-0279     ISO Abbreviation:  Protein Expr. Purif.     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-9-11     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9101496     Medline TA:  Protein Expr Purif     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012. Published by Elsevier Inc.
School of Bioscience and Bioengineering, South China University of Technology, Guangzhou 510006, PR China.
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