Multiple states of a nucleotide-bound group 2 chaperonin

被引:32
作者
Clare, Daniel K. [1 ,2 ]
Stagg, Scott [3 ]
Quispe, Joel [3 ]
Farr, George W. [4 ,5 ]
Horwich, Arthur L. [4 ,5 ,6 ]
Saibil, Helen R. [1 ,2 ]
机构
[1] Univ London Birkbeck Coll, Dept Crystallog, London WC1E 7HX, England
[2] Univ London, Inst Struct Mol Biol, London WC1E 7HX, England
[3] Scripps Res Inst, Dept Cell Biol, La Jolla, CA 92037 USA
[4] Howard Hughes Med Inst, Chevy Chase, MD 20815 USA
[5] Yale Univ, Sch Med, Boyer Ctr, New Haven, CT 06510 USA
[6] Scripps Res Inst, Dept Mol Biol, La Jolla, CA 92037 USA
基金
英国惠康基金;
关键词
D O I
10.1016/j.str.2008.01.016
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Chaperonin action is controlled by cycles of nucleotide binding and hydrolysis. Here, we examine the effects of nucleotide binding on an archaeal group 2 chaperonin. In contrast to the ordered apo state of the group 1 chaperonin GroEL, the unliganded form of the homo-16-mer Methanococcus maripaludis group 2 chaperonin is very open and flexible, with intersubunit contacts only in the central double belt of equatorial domains. The intermediate and apical domains are free of contacts and deviate significantly from the overall 8-fold symmetry. Nucleotide binding results in three distinct, ordered 8-fold symmetric conformations-open, partially closed, and fully closed. The partially closed ring encloses a 40% larger volume than does the GroEL-GroES folding chamber, enabling it to encapsulate proteins up to 80 kDa, in contrast to the fully closed form, whose cavities are 20% smaller than those of the GroEL-GroES chamber.
引用
收藏
页码:528 / 534
页数:7
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