The effects of methyl mercury binding to microtubules.

The effects of methyl mercury binding to microtubules.
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甲基汞与微管结合的影响。

DOI:
10.1016/0041-008x(85)90392-8
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发表时间:
1985
影响因子:
3.8
通讯作者:
Mottet,NK
Mottet,NK
中科院分区:
医学3区
文献类型:
--
作者:
Vogel,DG;Margolis,RL;Mottet,NK

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研究了氢氧化甲基汞(MeHg)对微管体外聚合和解聚的影响。3.0 × 10−5m MeHg时,聚合完全被抑制,1.0 × 10−5m MeHg时发生解聚,5.0 × 10−5m MeHg时解聚速率最大,为- 0.33%/min。在1.0 × 10−4m MeHg或更高时,在聚合和解聚体系中均形成汞-蛋白聚集体。每个微管蛋白二聚体确定了15个游离巯基,MeHg与所有15个巯基结合。当甲基汞与每个二聚体仅结合2个游离巯基时,它抑制聚合。甲基汞与暴露在微管表面的自由巯基以及暴露在末端的自由巯基结合。这些结果表明甲基汞在体外是一种有效的微管组装抑制剂,与微管蛋白二聚体的化学计量比。甲基汞对微管的影响可能是通过甲基汞与微管末端和表面的游离巯基结合而介导的。微管表面存在的结合位点(游离巯基)表明甲基汞有多种结合位点。
The effects of methyl mercury hydroxide (MeHg) on the in vitro polymerization and depolymerization of microtubules were studied. Polymerization was totally inhibited at 3.0 × 10−5m MeHg and depolymerization occurred at concentrations above 1.0 × 10−5m MeHg, reaching a maximal rate of −0.33%/min at 5.0 × 10−5m MeHg. At or above 1.0 × 10−4m MeHg, a mercury-protein aggregate formed in both the polymerization and depolymerization systems. Fifteen free sulfhydryl groups per tubulin dimer were determined, and MeHg bound to all 15. When MeHg bound to only 2 free sulfhydryl groups per dimer, it inhibited polymerization. MeHg bound to free sulfhydryl groups exposed uniquely on the surface of microtubules, as well as those free sulfhydryl groups exposed on the ends. These results show MeHg in vitro to be a potent microtubule assembly inhibitor at ratios stoichiometric with the tubulin dimer. The effects of MeHg on microtubules are presumably mediated through MeHg binding to free sulfhydryl groups both on the ends and on the surface of microtubules. The presence of binding sites (free sulfhydryl groups) on the microtubule surface suggests multiple classes of binding sites for MeHg.
DOI: --
发表时间: 1979
影响因子: 5.6
作者:
Ignacio V. Sandoval;Klaus Weber
通讯作者: Klaus Weber
甲基汞作为有丝分裂干扰剂。
DOI: --
发表时间: 1969
期刊: Nihon Ishikai zasshi. Journal of the Japan Medical Association
影响因子: --
作者:
C. Ramel
通讯作者: C. Ramel
DOI: 10.1093/oxfordjournals.jbchem.a131247
发表时间: 1976-01-01
影响因子: 2.7
作者:
KURIYAMA, R
通讯作者: KURIYAMA, R
DOI: 10.1073/pnas.74.8.3466
发表时间: 1977-01-01
影响因子: 11.1
作者:
MARGOLIS, RL;WILSON, L
通讯作者: WILSON, L
氯化甲基汞对人体外活细胞有丝分裂的破坏作用
DOI: --
发表时间: 1977
期刊:
影响因子: --
作者:
D. Rożynkowa;B. Raczkiewicz
通讯作者: B. Raczkiewicz