Electrostatic forces contribute to interactions between trp repressor dimers.

Electrostatic forces contribute to interactions between trp repressor dimers.
复制标题

静电力有助于色氨酸阻遏物二聚体之间的相互作用。

DOI:
10.1016/s0006-3495(94)80898-7
复制
发表时间:
1994
影响因子:
3.4
通讯作者:
Lee,JC
Lee,JC
中科院分区:
生物学3区
文献类型:
--
作者:
Martin,KS;Royer,CA;Howard,KP;Carey,J;Liu,YC;Matthews,K;Heyduk,E;Lee,JC

文献摘要

参考文献

被引文献

相似文献

尽管通常认为大肠杆菌(TR)的trp阻遏物是二聚体的,但是已经通过外源性标记的蛋白质的荧光各向异性显示,其在微摩尔范围内的蛋白质浓度下在溶液中经历寡聚化(Fernando,T.,和C. A. Royer 1992.生物化学。31:3429-3441)。提供证据表明,低聚化是TR的固有特性,本研究使用化学交联,分析超离心,和分子筛色谱法证明,未修饰的TR二聚体形成更高阶的聚集体。在化学交联实验中,在1和40 μ M之间的浓度下观察到四聚体和更高阶物种。分析超离心和凝胶过滤色谱法的结果与四聚体和二聚体之间的平均分子量值一致,尽管在研究的浓度范围内没有明显的关联平台,表明存在更高阶的物质。在辅阻遏物存在下的分析超离心数据暗示辅阻遏物结合使高阶聚集体不稳定,这一观察结果与早期的荧光工作一致。通过研究低聚反应的盐和pH依赖性,本研究揭示了TR二聚体之间的相互作用的静电分量。
The trp repressor of Escherichia coli (TR), although generally considered to be dimeric, has been shown by fluorescence anisotropy of extrinsically labeled protein to undergo oligomerization in solution at protein concentrations in the micromolar range (Fernando, T., and C. A. Royer 1992. Biochemistry. 31:3429–3441). Providing evidence that oligomerization is an intrinsic property of TR, the present studies using chemical cross-linking, analytical ultracentrifugation, and molecular sieve chromatography demonstrate that unmodified TR dimers form higher order aggregates. Tetramers and higher order species were observed in chemical cross-linking experiments at concentrations between 1 and 40 microM. Results from analytical ultracentrifugation and gel filtration chromatography were consistent with average molecular weight values between tetramer and dimer, although no plateaus in the association were evident over the concentration ranges studied, indicating that higher order species are populated. Analytical ultracentrifugation data in presence of corepressor imply that corepressor binding destabilizes the higher order aggregates, an observation that is consistent with the earlier fluorescence work. Through the investigation of the salt and pH dependence of oligomerization, the present studies have revealed an electrostatic component to the interactions between TR dimers.
DOI: 10.1016/0968-0004(91)90164-q
发表时间: 1991-11-01
影响因子: 13.8
作者:
ROEDER, RG
通讯作者: ROEDER, RG
Trp 阻遏蛋白与溴脱氧尿苷取代操纵子的相互作用以序列依赖性方式改变紫外线诱导的扰动模式。
DOI: 10.1021/bi00091a002
发表时间: 1993
期刊: Biochemistry
影响因子: 2.9
作者:
Liu,YC;Matthews,KS
通讯作者: Matthews,KS
大肠杆菌细胞内色氨酸阻遏蛋白水平
DOI: --
发表时间: 1986
影响因子: 3.2
作者:
R. Gunsalus;A. G. Miguel;G. Gunsalus
通讯作者: G. Gunsalus
trp 阻遏蛋白如何与其操纵子结合?
DOI: --
发表时间: 1991
期刊: The Journal of biological chemistry
影响因子: --
作者:
Carey,J;Lewis,DE;Lavoie,TA;Yang,J
通讯作者: Yang,J
DOI: 10.1111/j.1432-1033.1989.tb21083.x
发表时间: 1989
期刊: European journal of biochemistry
影响因子: --
作者:
Hyde,EI;Ramesh,V;Roberts,GC;Arrowsmith,CH;Treat-Clemons,L;Klaic,B;Jardetzky,O
通讯作者: Jardetzky,O