Document Detail

Facile production of native-like kappa-bungarotoxin in yeast: an enhanced system for the production of a neuronal nicotinic acetylcholine receptor probe.
MedLine Citation:
PMID:  8711755     Owner:  NLM     Status:  MEDLINE    
Research on the mammalian central nervous system had been hindered by the limited number and meager supply of naturally occurring toxins that can be used as pharmacological reagents. The kappa-neurotoxins in particular are not found abundantly in nature and are difficult to obtain and isolate in quantities sufficient for research purposes. Here we report the expression and isolation of relatively large quantities of the kappa-neurotoxin, kappa-bungarotoxin, in an active form using a yeast, Pichia pastoris, expression system. The resultant product of the expression system has a short amino-terminal amino acid extension relative to venom-derived kappa-bungarotoxin, but is equivalent to the native toxin in physical and biological properties, as judged by the CD spectra, the ability to form dimers in solution, and the activity on chick ciliary ganglia. The yeast system produces approximately 0.2 mg from a 2 liter culture and the purification takes approximately 2 days. In contrast, E. coli, the only other available expression system for this toxin, produces one-fifth to one-half as much active material from a 5 liter high-density fermentation and the resulting protein takes over a week to purify. No high mol. wt disulfide-bonded aggregates were found in the yeast expression system product, indicating that the product is that of a biologically assisted folding process. This has significant implications not only for the efficient production of native toxin but also for the production of mutant proteins to study the structure-function relationship in these proteins.
J J Fiordalisi; P L James; Y Zhang; G A Grant
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Toxicon : official journal of the International Society on Toxinology     Volume:  34     ISSN:  0041-0101     ISO Abbreviation:  Toxicon     Publication Date:  1996 Feb 
Date Detail:
Created Date:  1996-09-12     Completed Date:  1996-09-12     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  1307333     Medline TA:  Toxicon     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  213-24     Citation Subset:  IM    
Department of Molecular Biology and Pharmacology, Washington University School of Medicine, St Louis, MO 63110, USA.
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MeSH Terms
Acetylcholine / pharmacology*
Amino Acid Sequence
Base Sequence
Bungarotoxins / biosynthesis*,  chemistry,  toxicity
Chromatography, Ion Exchange
Gene Expression / genetics
Molecular Sequence Data
Neurons / metabolism*
Polymerase Chain Reaction / methods
Receptors, Nicotinic / genetics,  metabolism*
Recombinant Fusion Proteins / biosynthesis,  chemistry
Yeasts / metabolism*
Grant Support
Reg. No./Substance:
0/Bungarotoxins; 0/Receptors, Nicotinic; 0/Recombinant Fusion Proteins; 51-84-3/Acetylcholine

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