Structural correspondence between the α-helix and the random-flight chain resolves how unfolded proteins can have native-like properties
Structural correspondence between the α-helix and the random-flight chain resolves how unfolded proteins can have native-like properties
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α 螺旋和随机飞行链之间的结构对应关系解决了未折叠蛋白质如何具有类似天然的特性
DOI:
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发表时间:
2003
期刊:
影响因子:
--
通讯作者:
V. Pande
中科院分区:
文献类型:
--
作者:
B. Žagrović;V. Pande
Recently, we have proposed that, on average, the structure of the unfolded state of small, mostly α-helical proteins may be similar to the native structure (the 'mean-structure' hypothesis). After examining thousands of simulations of both the folded and the unfolded states of five polypeptides in atomistic detail at room temperature, we report here a result that seems at odds with the mean-structure hypothesis. Specifically, the average inter-residue distances in the collapsed unfolded structures agree well with the statistics of the ideal random-flight chain with link length of 3.8 Å (the length of one amino acid). A possible resolution of this apparent contradiction is offered by the observation that the inter-residue distances in a typical α-helix over short stretches are close to the average distances in an ideal random-flight chain.
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