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Interaction of GroEL and GroEL/GroES complexes with a nonnative subtilisin variant: a small-angle neutron scattering study.

Abstract：

:Small-angle neutron scattering and contrast variation were used to study the solution structure of GroEL and GroEL/GroES chaperonins complexed with a nonnative variant of the polypeptide substrate, subtilisin (PJ9). The subtilisin was 86% deuterated (dPJ9) so that it contrasted sufficiently with the chaperonin, allowing the contrast variation technique to be used to separate the scattering from the two components bound in the complex. Both the native double-ring GroEL and a single-ring mutant were used with dPJ9 bound in a 1:1 stoichiometry per GroEL toroid. This allowed both the position and the shape of dPJ9 in the GroEL/dPJ9 complexes to be determined. A single-ring GroEL/GroES variant complexed with one dPJ9 molecule was used to study the structural changes of dPJ9 in GroEL/GroES/dPJ9 complexes formed with ADP and with ATP. It was found that both the shape and the position of the bound dPJ9 in the GroEL/GroES/dPJ9 complex with ADP were the same as those in the GroEL/dPJ9 complex. However, dPJ9 assumed a more symmetric shape when bound in the GroEL/GroES/dPJ9 complex with ATP. This important observation reflects the relative ability of ATP to promote refolding of protein substrates relative to that of ADP.

journal_name

J Struct Biol

journal_title

Journal of structural biology

authors

Krueger S,Gregurick SK,Zondlo J,Eisenstein E

doi

10.1016/s1047-8477(03)00002-9

keywords:

subject

Has Abstract

pub_date

2003-03-01 00:00:00

pages

240-58

issue

3

eissn

1047-8477

issn

1095-8657

pii

S1047847703000029

journal_volume

141

pub_type

杂志文章

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