Abstract:
:Overexpression and purification are procedures used to allow functional and structural characterization of proteins. Many overexpressed proteins are partially or completely insoluble, and can not be easily purified. The NifA protein is an enhancer-binding protein involved in activating the expression of nif and some fix genes. The NifA protein from many organisms is usually insoluble when over-expressed, and therefore difficult to work with in vitro. In this work we have overexpressed the central + C-terminal and the central domains of the Herbaspirrilum seropedicae NifA protein in an Escherichia coli background. Expression was induced with either IPTG or lactose. The data showed that induction with lactose promoted a significantly higher percentage of these proteins in the soluble fraction than with IPTG. This probably reflects a slower kinetics of induction by lactose.
journal_name
Can J Microbioljournal_title
Canadian journal of microbiologyauthors
Monteiro RA,Souza EM,Yates MG,Pedrosa FO,Chubatsu LSdoi
10.1139/w00-094subject
Has Abstractpub_date
2000-11-01 00:00:00pages
1087-90issue
11eissn
0008-4166issn
1480-3275journal_volume
46pub_type
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