Solubility of the catalytic domains of Botulinum neurotoxin serotype E subtypes.

Abstract:

:The Clostridium botulinum neurotoxins (BoNTs) are the most potent protein toxins known to humans. There are seven serotypes of the BoNTs (A-G), among which serotypes A, B, E and F are known to cause natural human intoxication. To date, eleven subtypes of LC/E, termed E1∼E11, have been identified. The LCs of BoNT/E were insoluble, prohibiting studies towards understanding the mechanisms of toxin action and substrate recognition. In this work, the molecular basis of insolubility of the recombinant LCs of two representative subtypes of BoNT/E, E1(Beluga) and E3 (Alaska), was determined. Hydrophobicity profile and structural modeling predicted a C-terminal candidate region responsible for the insolubility of LC/Es. Deletion of C-terminal 19 residues of LC/E(1-400) resulted in enhanced solubility, from 2 to ∼50% for LC/EAlaska and from 16 to ∼95% for LC/EBeluga. In addition, resides 230-236 were found to contribute to a different solubility level of LC/EAlaska when compared to LC/EBeluga. Substituting residues (230)TCI(232) in LC/EAlaska to the corresponding residues of (230)KYT(232) in LC/EBeluga enhanced the solubility of LC/EAlaska to a level approaching that of LC/EBeluga. Among these LC/Es and their derivatives, LC/EBeluga 1-400 was the most soluble and stable protein. Each LC/E derivative possessed similar catalytic activity, suggesting that the C-terminal region of LC/Es contributed to protein solubility, but not catalytic activity. In conclusion, this study generated a soluble and stable recombinant LC/E and provided insight into the structural components that govern the solubility and stability of the LCs of other BoNT serotypes and Tetanus toxin.

journal_name

Protein Expr Purif

authors

Chen S,Barbieri JT

doi

10.1016/j.pep.2015.10.003

subject

Has Abstract

pub_date

2016-02-01 00:00:00

pages

18-24

eissn

1046-5928

issn

1096-0279

pii

S1046-5928(15)30083-8

journal_volume

118

pub_type

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