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Efficient production of a correctly folded mouse α-defensin, cryptdin-4, by refolding during inclusion body solubilization.

Abstract：

:Mammalian α-defensins contribute to innate immunity by exerting antimicrobial activity against various pathogens. To perform structural and functional analysis of α-defensins, large amounts of α-defensins are essential. Although many expression systems for the production of recombinant α-defensins have been developed, attempts to obtain large amounts of α-defensins have been only moderately successful. Therefore, in this study, we applied a previously developed aggregation-prone protein coexpression method for the production of mouse α-defensin cryptdin-4 (Crp4) in order to enhance the formation of inclusion bodies in Escherichia coli expression system. By using this method, we succeeded in obtaining a large amount of Crp4 in the form of inclusion bodies. Moreover, we attempted to refold Crp4 directly during the inclusion-body solubilization step under oxidative conditions. Surprisingly, even without any purification, Crp4 was efficiently refolded during the solubilization step of inclusion bodies, and the yield was better than that of the conventional refolding method. NMR spectra of purified Crp4 suggested that it was folded into its correct tertiary structure. Therefore, the method described in this study not only enhances the expression of α-defensin as inclusion bodies, but also eliminates the cumbersome and time-consuming refolding step.

journal_name

Protein Expr Purif

journal_title

Protein expression and purification

authors

Tomisawa S,Sato Y,Kamiya M,Kumaki Y,Kikukawa T,Kawano K,Demura M,Nakamura K,Ayabe T,Aizawa T

doi

10.1016/j.pep.2015.04.007

subject

Has Abstract

pub_date

2015-08-01 00:00:00

pages

21-8

eissn

1046-5928

issn

1096-0279

pii

S1046-5928(15)00087-X

journal_volume

112

pub_type

杂志文章

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