期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 131, 期 33, 页码 11727-11733出版社
AMER CHEMICAL SOC
DOI: 10.1021/ja900438b
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资金
- Wenner-Gren Foundations (Sweden)
- Italian Ministero dell'Istruzione dell'Universita e del la Ricerca [2007B57EAB-004, 20074TJ3ZB_005, RBRN07BMCT_007]
To understand the role of sequence connectivity in protein folding pathways, we explored by Phi-value analysis the folding pathway of an engineered circularly permuted PDZ domain. This variant has the same sequence connectivity as naturally occurring circularly permuted PDZ domains and displays a symmetrical distribution of secondary structure elements (i.e., beta beta alpha beta beta alpha beta beta) while maintaining the same tertiary interactions of the well-characterized second PDZ domain from PTP-BL (PDZ2). Reliable Phi values were obtained for both a low-energy intermediate and the late rate-limiting transition state, allowing a description of both early and late events in folding. A comparison with Phi values obtained for wild-type PDZ2 reveals that while the structure of the late transition state is robust and unaffected by circular permutation, the folding intermediate is stabilized by a different nucleus involving residues located at the new N- and C-termini. The results suggest that folding is driven by competing nuclei whose stabilities may be selectively tuned by circular permutation.
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