A small engineered protein lacks structural uniqueness by increasing the side-chain conformational entropy.

A small engineered protein lacks structural uniqueness by increasing the side-chain conformational entropy.
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小型工程蛋白通过增加侧链构象熵而缺乏结构独特性。

DOI:
10.1073/pnas.93.24.13583
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发表时间:
1996
影响因子:
11.1
通讯作者:
H. Nakamura
H. Nakamura
中科院分区:
综合性期刊1区
文献类型:
--
作者:
K. Furukawa;M. Oda;H. Nakamura

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为了了解天然蛋白的结构独特性,我们设计了一个小的球形蛋白,它是c-Myb dna结合域的第三个重复序列,由54个氨基酸残基组成。这个小蛋白有三个α -螺旋,形成一个螺旋-螺旋-螺旋结构,由三个Ile残基的疏水核心维持。其中一个突变蛋白的两个隐藏的Ile (Ile-155和Ile-181)被Leu残基取代,通过13C-和15n标记的蛋白的异核磁共振谱监测显示出多种构象。侧链构象熵的增加是由于将α -螺旋上的Ile变为Leu残基而引起的,这可能导致结构独特性的缺乏。在天然蛋白质中,不仅β支链侧链的构象,而且邻近的大链侧链的构象都可以受到很大的限制,这取决于局部的主链结构。
A small globular protein, the third repeat of the c-Myb DNA-binding domain, which is composed of 54 amino acid residues, was engineered so as to understand the structural uniqueness of native proteins. This small protein has three alpha-helices that form a helix-turn-helix structure, which is maintained by the hydrophobic core with three Ile residues. One of the mutant proteins, with two of the buried Ile (Ile-155 and Ile-181) substituted with Leu residues, showed multiple conformations, as monitored by heteronuclear magnetic resonance spectroscopy for 13C- and 15N-labeled proteins. The increase in the side-chain conformational entropy, caused by changing the Ile to a Leu residue on an alpha-helix, could engender the lack of structural uniqueness. In native proteins, the conformations of not only the beta-branched side chains, but also those of the neighboring bulky side chains, can be greatly restricted, depending upon the local backbone structure.
DOI: 10.1006/jmbi.1993.1417
发表时间: 1993-07-20
影响因子: 5.6
作者:
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通讯作者: MAKHATADZE, GI
当间距为 i, i 4 时,酪氨酸和亮氨酸或缬氨酸之间的螺旋稳定相互作用。
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影响因子: 5.6
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期刊: SCIENCE
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发表时间: 1995-07-11
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发表时间: 1992-03-15
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