Construction of an atomic model for tropomyosin and implications for interactions with actin.
Construction of an atomic model for tropomyosin and implications for interactions with actin.
复制标题
原肌球蛋白原子模型的构建及其与肌动蛋白相互作用的影响。
DOI:
10.1016/0022-2836(86)90469-9
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发表时间:
1986
影响因子:
5.6
通讯作者:
PhillipsJr,GN
中科院分区:
文献类型:
--
作者:
PhillipsJr,GN
An atomic model of tropomyosin has been constructed that includes precise information about the three-dimensional winding of the molecule in the crystal, the crystallographically determined pitch of the coiled coil, stereochemically reasonable bond lengths and angles, and intermeshed hydrophobic side-chains at the interface of the two a-helices. This model allows a visualization of the atomic structure of tropomyosin, and is useful for modeling the molecule’s interactions with troponin and actin.The length of a tropomyosin molecule is such that it spans seven actin monomers along the thin filament. On this basis, a periodic structure might be expected for tropomyosin. The long-range periodicities in the amino acid sequence of tropomyosin that Parry (1975a) and McLachlan & Stewart (1976) identified as likely actin-binding regions have now been re-examined by including three-dimensional information. In their quantitative analysis of periodicities, the molecule was treated as a linear string of amino acids, and Fourier transforms were used to measure the statistical significance of “seven-ness” or “fourteenness” of charge distributions. They concluded that the fundamental sequence repeat was 14-fold on the basis of the analysis, but go on to say that the 14 sites are divided into two alternating sets of seven sites, termed a-zones and p-zones (not to be confused with a-and fi-isoforms of tropomyosin from different tissues). They further emphasize the consistent features of the a-sites relative to the p-sites. Here, we extend the quantitative analysis to include information about the relative azimuthal positions of the amino acid side-chains, and arrive at the conclusion that sevenfold periodicity is the fundamental feature.
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影响因子:
4.8
作者:
M. Pato;A. Mak;L. Smillie
通讯作者:
L. Smillie
影响因子:
4.8
作者:
L. Greene
通讯作者:
L. Greene
DOI:
--
发表时间:
1985
期刊:
Journal of Biochemistry (Tokyo)
影响因子:
--
作者:
C. Toyoshima;T. Wakabayashi
通讯作者:
T. Wakabayashi
影响因子:
5.6
作者:
T. Yanagida;F. Oosawa
通讯作者:
F. Oosawa
DOI:
--
发表时间:
1967
期刊:
影响因子:
--
作者:
D. Parry;A. Elliott
通讯作者:
A. Elliott