RecOR complex including RecR N-N dimer and RecO monomer displays a high affinity for ssDNA.

RecOR complex including RecR N-N dimer and RecO monomer displays a high affinity for ssDNA.
复制标题

包含 RecR N-N 二聚体和 RecO 单体的 RecOR 复合物对 ssDNA 表现出高亲和力

DOI:
10.1093/nar/gks889
复制
发表时间:
2012-11
影响因子:
14.9
通讯作者:
Liang DC
Liang DC
中科院分区:
生物学2区
文献类型:
--
作者:
Tang Q;Gao P;Liu YP;Gao A;An XM;Liu S;Yan XX;Liang DC

文献摘要

参考文献

被引文献

相似文献

RecR是RecFOR途径中重要的重组介导蛋白。RecR与RecO和RecF一起促进RecA核蛋白丝的形成和同源配对。腾冲嗜热厌氧杆菌RecR(Thermoanaerobactertengcongensis RecR,TTERecR)及其系列突变体的结构和生化研究表明,TTERecR以N-N二聚体为基本功能单元,与TTERecO单体相互作用。两个TTERecR N-N二聚体通过它们的C-末端区域之间的相互作用形成环状四聚体。四聚体仅是结晶的结果。两个TTERecR单体的N-末端区域内的整个螺旋-发夹-螺旋结构域之间的疏水相互作用对于形成RecR功能性N-N二聚体是必需的。TTERecR N-N二聚体构象还影响疏水补丁的形成,这在TTERecR Toprim结构域中产生TTERecO的结合位点。此外,我们证明,TTERecR不结合单链DNA(ssDNA),并结合双链DNA非常弱,而TTERecOR复合物可以稳定地结合DNA,与ssDNA的亲和力比双链DNA。基于这些结果,我们提出了RecOR:ssDNA复合物的相互作用模型。
RecR is an important recombination mediator protein in the RecFOR pathway. RecR together with RecO and RecF facilitates RecA nucleoprotein filament formation and homologous pairing. Structural and biochemical studies of Thermoanaerobacter tengcongensis RecR (TTERecR) and its series mutants revealed that TTERecR uses the N-N dimer as a basic functional unit to interact with TTERecO monomer. Two TTERecR N-N dimers form a ring-shaped tetramer via an interaction between their C-terminal regions. The tetramer is a result of crystallization only. Hydrophobic interactions between the entire helix-hairpin-helix domains within the N-terminal regions of two TTERecR monomers are necessary for formation of a RecR functional N-N dimer. The TTERecR N-N dimer conformation also affects formation of a hydrophobic patch, which creates a binding site for TTERecO in the TTERecR Toprim domain. In addition, we demonstrate that TTERecR does not bind single-stranded DNA (ssDNA) and binds double-stranded DNA very weakly, whereas TTERecOR complex can stably bind DNA, with a higher affinity for ssDNA than double-stranded DNA. Based on these results, we propose an interaction model for the RecOR:ssDNA complex.
DOI: 10.1073/pnas.252633399
发表时间: 2002-11-26
影响因子: 11.1
作者:
Kantake, N;Madiraju, MVVM;Kowalczykowski, C
通讯作者: Kowalczykowski, C
DOI: 10.1107/s0907444904019158
发表时间: 2004-12-01
影响因子: 2.2
作者:
Emsley, P;Cowtan, K
通讯作者: Cowtan, K
DOI: 10.1038/sj.emboj.7600222
发表时间: 2004-05-19
期刊: EMBO JOURNAL
影响因子: 11.4
作者:
Lee, BI;Kim, KH;Suh, SW
通讯作者: Suh, SW
DOI: 10.1128/jb.177.3.566-572.1995
发表时间: 1995-02-01
影响因子: 3.2
作者:
LUISIDELUCA, C
通讯作者: LUISIDELUCA, C
DOI: 10.1107/s0907444909052925
发表时间: 2010-02
期刊: Acta crystallographica. Section D, Biological crystallography
影响因子: --
作者:
Adams PD;Afonine PV;Bunkóczi G;Chen VB;Davis IW;Echols N;Headd JJ;Hung LW;Kapral GJ;Grosse-Kunstleve RW;McCoy AJ;Moriarty NW;Oeffner R;Read RJ;Richardson DC;Richardson JS;Terwilliger TC;Zwart PH
通讯作者: Zwart PH