Binding of myosin subfragment-1 to F-actin.

Binding of myosin subfragment-1 to F-actin.
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肌球蛋白亚片段 1 与 F-肌动蛋白的结合。

DOI:
10.1016/0006-291x(92)92354-z
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发表时间:
1992
影响因子:
3.1
通讯作者:
Borejdo,J
Borejdo,J
中科院分区:
生物学4区
文献类型:
--
作者:
Andreev,O;Borejdo,J

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在水解循环的一部分中,肌球蛋白头(S1)不携带核苷酸,并与肌动蛋白丝牢固结合,形成严格的结合。在僵直状态下,S1与肌动蛋白形成1:1的复合物。然而,我们提供的证据表明,在某些条件下,S1也可以与细丝中的2个肌动蛋白单体形成复合物(Andreev,OA & Borejdo,J.(1991)Biochem. Biophys. 177,350-356)。这一观点最近受到了Carlier & Didry(Carlier,MF。& Didry,D.(1992)Biochem. Biophys. Res.Comm.183,970-974),他通过暗示F-肌动蛋白经历简单的解聚来解释我们的数据,并暗示当仅对F-形式的肌动蛋白进行评分时,我们实验中的真实的化学计量是1:1。我们在这里表明,在我们的实验条件下,不到8%的肌动蛋白解聚。此外,我们在鬼笔环肽的存在下重复了实验,并表明在这些条件下,当S1缓慢加入到固定浓度的F-肌动蛋白中时,它与F-肌动蛋白形成的复合物与快速加入时不同。这证实了我们最初的结论,即S1可以以两种不同的方式结合肌动蛋白,并表明F-actin的解聚不是导致这一发现的原因。
During a part of the hydrolytic cycle, myosin head (S1) carries no nucleotide and binds strongly to an actin filament forming a rigor bond. At saturating concentration of S1 in rigor, S1 is well known to form 1: 1 complex with actin. However, we have provided evidence that under certain conditions S1 could also form a complex with 2 actin monomers in a filament (Andreev, OA & Borejdo, J.(1991) Biochem. Biophys. Res. Comm. 177, 350–356). This view was recently challenged by Carlier & Didry (Carlier, MF. & Didry, D.(1992) Biochem. Biophys. Res. Comm. 183, 970–974) who interpreted our data by suggesting that F-actin underwent a simple depolymerization and implied that, when only actin in the F-form was scored, the real stoichiometry in our experiments was 1: 1. We show here that under conditions of our experiments less than 8% of actin was depolymerized. Moreover, we have repeated the experiments in the presence of phalloidin and show that under these conditions too, when S1 was added slowly to a fixed concentration of F-actin, it formed a different complex with F-actin than when it was added quickly. This confirms our original conclusion that S1 can bind actin in two different ways and shows that depolymerization of F-actin is not responsible for this finding.
腺苷基-5-基亚胺二磷酸、ADP 和 PPi 解离肌动蛋白亚片段 1 复合物。
DOI: --
发表时间: 1980
影响因子: 4.8
作者:
L. Greene;E. Eisenberg
通讯作者: E. Eisenberg
重 meromyosin 和 subfragment-1 与肌原纤维和单肌纤维中的细丝结合。
DOI: 10.1021/bi00562a033
发表时间: 1980
期刊: Biochemistry
影响因子: 2.9
作者:
J. Borejdo;O. Assulin
通讯作者: O. Assulin
肌球蛋白头可以结合两个肌动蛋白单体。
DOI: 10.1016/0006-291x(91)91990-t
发表时间: 1991
影响因子: 3.1
作者:
O. Andreev;J. Borejdo
通讯作者: J. Borejdo
DOI: 10.1126/science.164.3886.1356
发表时间: 1969-01-01
期刊: SCIENCE
影响因子: 56.9
作者:
HUXLEY, HE
通讯作者: HUXLEY, HE
DOI: --
发表时间: 1973
影响因子: 5.6
作者:
S. Margossian;S. Margossian;Susan Lowey;Susan Lowey
通讯作者: Susan Lowey