A noncovalent peptide complex as a model for an early folding intermediate of cytochrome c.

A noncovalent peptide complex as a model for an early folding intermediate of cytochrome c.
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作为细胞色素 c 早期折叠中间体模型的非共价肽复合物。

DOI:
10.1021/bi00089a050
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发表时间:
1993
期刊:
影响因子:
2.9
通讯作者:
Roder,H
Roder,H
中科院分区:
生物学3区
文献类型:
--
作者:
Wu,LC;Laub,PB;Elöve,GA;Carey,J;Roder,H

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Revised Manuscript Received July 16, 19939 abstract: Horse heart cytochrome c is one of a small number of proteins for which the folding pathway has been elucidated in structural detail by pulsed hydrogen exchange and NMR. Those studies indicated that a partially folded intermediate with interacting N-and C-terminal helices is formed at an early stage of folding when most of the chain is still disordered. This report describes a peptide model for this early intermediate, consisting of a noncovalent complex between a heme-containing N-terminal fragment (residues 1-38) and a synthetic peptide corresponding to the C-terminal helix (residues 87-104). Far-UV circular dichroism and proton NMR indicate that the isolated peptides are largely disordered, but when combined, they form a flexible, yet tightly bound complex with enhanced helical structure. These results emphasize the importance of interactions between marginally stable elements of secondary structure in forming tertiary subdomains in protein folding.A major goal in the study of protein folding is to characterize intermediate structures along the folding pathway, in hope of elucidating the mechanism of protein folding. This effort is hindered, however, by the cooperative nature of folding and the short lifetimes of transient intermediates, which make it difficult to isolate and characterize partially folded states. Several approaches have been developed to circumvent this problem, including trapping of disulfide-bonded intermediates (Creighton, 1978; Weissman & Kim, 1991), pulsed hydrogen exchange with NMR analysis of refolding kinetics (Udgaonkar
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