Stimulating the Substrate Folding Activity of a Single Ring GroEL Variant by Modulating the Cochaperonin GroES

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2011 Jul 16

PMID 21757689

Citations 12

Authors

Melissa Illingworth

Andrew Ramsey

Zhida Zheng

Lingling Chen

Affiliations

Soon will be listed here.

Abstract

In mediating protein folding, chaperonin GroEL and cochaperonin GroES form an enclosed chamber for substrate proteins in an ATP-dependent manner. The essential role of the double ring assembly of GroEL is demonstrated by the functional deficiency of the single ring GroEL(SR). The GroEL(SR)-GroES is highly stable with minimal ATPase activity. To restore the ATP cycle and the turnover of the folding chamber, we sought to weaken the GroEL(SR)-GroES interaction systematically by concatenating seven copies of groES to generate groES(7). GroES Ile-25, Val-26, and Leu-27, residues on the GroEL-GroES interface, were substituted with Asp on different groES modules of groES(7). GroES(7) variants activate ATP activity of GroEL(SR), but only some restore the substrate folding function of GroEL(SR), indicating a direct role of GroES in facilitating substrate folding through its dynamics with GroEL. Active GroEL(SR)-GroES(7) systems may resemble mammalian mitochondrial chaperonin systems.

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