Stereoselectivity of the guanyl-exchangeable nucleotide-binding site of tubulin probed by guanosine 5'-O-(2-thiotriphosphate) diastereoisomers.
Stereoselectivity of the guanyl-exchangeable nucleotide-binding site of tubulin probed by guanosine 5'-O-(2-thiotriphosphate) diastereoisomers.
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通过鸟苷 5-O-(2-硫代三磷酸) 非对映异构体探测微管蛋白的鸟苷基可交换核苷酸结合位点的立体选择性。
DOI:
10.1021/bi00420a032
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发表时间:
1988
期刊:
影响因子:
2.9
通讯作者:
Gaskin,F
中科院分区:
文献类型:
--
作者:
Roychowdhury,S;Gaskin,F
Revised Manuscript Received June 7, 1988 abstract: The active site of the exchangeable nucleotide-binding site of tubulin was studied by using diastereoisomers A (SP) and B (RP) of guanosine 5/-0-(2-thiotriphosphate)(GTP/3S) where thephosphorus atom to whichsulfur is attached is chiral. Turbidimetric measurements were used to follow kinetics, and electron microscopy was used to evaluatepolymeric forms. Both isomers at 0.5 mM promoted the assembly of tubulin in buffer containing 0.1 M 2-(/V-morpholino) ethanesulfonic acid, 30% glycerol, 3 mM MgCl2, and 1 mM EGTA, pH 6.6, 23-37 C. GTP/? S (A) promotedassembly into microtubules, although a few bundles were also found by electron microscopy. However, GTP/3S (B) induced assembly of tubulin into bundles of sheets and microtubules. As expected, 0.5 mM GTP induced tubulin to assemble into microtubules, thin sheets, and a few bundles. Both GTP and GTP/3S (A) were hydrolyzed in the tubulin polymers. However, more than 95% of the bound GTP/3S (B) was not hydrolyzed. Higher concentrations of GTP/3S (B), ie,
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影响因子:
5.6
作者:
S. Penningroth;M. Kirschner
通讯作者:
M. Kirschner
影响因子:
4.8
作者:
M. Kirsch;L. Yarbrough
通讯作者:
L. Yarbrough
DOI:
--
发表时间:
1978
期刊:
影响因子:
--
作者:
M. McKeag;P. Brown
通讯作者:
P. Brown
影响因子:
3.9
作者:
R. MacNeal;D. Purich
通讯作者:
D. Purich
影响因子:
4.8
作者:
E. Hamel;A. D. del Campo;C. Lin
通讯作者:
C. Lin