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
Gaskin,F
中科院分区:
生物学3区
文献类型:
--
作者:
Roychowdhury,S;Gaskin,F

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1988年6月7日收到的修订稿摘要:用鸟苷5/-0-(2-硫代三磷酸)(GTP/3S)的非对映异构体A(SP)和B(RP)研究了微管蛋白可交换核苷酸结合部位的活性部位,其中硫原子是手性的。浊度测量用于跟踪动力学,电子显微镜用于评估聚合物的形态。在含有0.1M2-(/V-吗啉)乙磺酸、30%甘油、3 mM氯化镁和1 mM EGTA的缓冲液中,pH 6.6,23-37℃GTP/?S(A)促进了微管的组装,但在电子显微镜下也发现了一些束。然而,GTP/3S(B)诱导微管蛋白组装成片状和微管束。正如预期的那样,0.5 mM GTP诱导微管蛋白组装成微管、薄片和几束。GTP和GTP/3S(A)均在微管蛋白聚合物中发生水解性反应。然而,95%以上的结合GTP/3S(B)没有被水解。较高浓度的GTP/3S(B),即
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
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DOI: 10.1016/0003-9861(78)90086-3
发表时间: 1978
影响因子: 3.9
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发表时间: 1984
影响因子: 4.8
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