Biochemical analysis of the N-terminal domain of human RAD54B.

Biochemical analysis of the N-terminal domain of human RAD54B.
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DOI:
10.1093/nar/gkn516
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发表时间:
2008-10
影响因子:
14.9
通讯作者:
Yokoyama S
Yokoyama S
中科院分区:
生物学2区
文献类型:
--
作者:
Sarai N;Kagawa W;Fujikawa N;Saito K;Hikiba J;Tanaka K;Miyagawa K;Kurumizaka H;Yokoyama S

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人 RAD54B 蛋白是 RAD54 蛋白的旁系同源物,在同源重组中发挥重要作用。 RAD54B 包含 SWI2/SNF2 结构域外部的 N 末端区域,与 RAD54 中的相应区域相比具有较少的保守性。尽管已知 RAD54 中的相应区域与 RAD51 发生物理相互作用,但 RAD54B 该区域的生化作用尚不清楚。在本研究中,我们对 RAD54B 的 N 末端片段进行了生化表征,该片段由氨基酸残基 26-225 (RAD54B26-225) 组成。该片段在溶液中形成稳定的二聚体并与分支 DNA 结构结合。无论 DNA 存在还是不存在,RAD54B26-225 也会与 DMC1 相互作用。制备了跨越DMC1序列整个区域的10个DMC1片段,并且发现含有氨基酸残基153-214和296-340的两个片段直接结合至RAD54B的N端结构域。 DMC1 与伏氏甲烷球菌 RadA 蛋白(螺旋丝形式的 DMC1 同源物)的结构比对表明,这些 RAD54B 结合位点位于 DMC1 螺旋丝中单体-单体界面处的 ATP 结合位点附近。因此,RAD54B 结合可能影响 DMC1 的四级结构。这些观察结果表明 RAD54B 的 N 末端结构域在同源重组中发挥多种作用。
The human RAD54B protein is a paralog of the RAD54 protein, which plays important roles in homologous recombination. RAD54B contains an N-terminal region outside the SWI2/SNF2 domain that shares less conservation with the corresponding region in RAD54. The biochemical roles of this region of RAD54B are not known, although the corresponding region in RAD54 is known to physically interact with RAD51. In the present study, we have biochemically characterized an N-terminal fragment of RAD54B, consisting of amino acid residues 26–225 (RAD54B26–225). This fragment formed a stable dimer in solution and bound to branched DNA structures. RAD54B26–225 also interacted with DMC1 in both the presence and absence of DNA. Ten DMC1 segments spanning the entire region of the DMC1 sequence were prepared, and two segments, containing amino acid residues 153–214 and 296–340, were found to directly bind to the N-terminal domain of RAD54B. A structural alignment of DMC1 with the Methanococcus voltae RadA protein, a homolog of DMC1 in the helical filament form, indicated that these RAD54B-binding sites are located near the ATP-binding site at the monomer–monomer interface in the DMC1 helical filament. Thus, RAD54B binding may affect the quaternary structure of DMC1. These observations suggest that the N-terminal domain of RAD54B plays multiple roles of in homologous recombination.
DOI: 10.1038/nsb901
发表时间: 2003-03-01
期刊: NATURE STRUCTURAL BIOLOGY
影响因子: --
作者:
Alexeev, A;Mazin, A;Kowalczykowski, SC
通讯作者: Kowalczykowski, SC
DOI: 10.1074/jbc.m212779200
发表时间: 2003-04-18
影响因子: 4.8
作者:
Mazin, AV;Alexeev, AA;Kowalczykowski, SC
通讯作者: Kowalczykowski, SC
DOI: 10.1074/jbc.m701992200
发表时间: 2007-07-20
影响因子: 4.8
作者:
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通讯作者: Mazin, Alexander V.
DOI: 10.1038/35003501
发表时间: 2000-03-02
期刊: NATURE
影响因子: 64.8
作者:
Cox, MM;Goodman, MF;Marians, KJ
通讯作者: Marians, KJ
DOI: 10.1016/s1097-2765(03)00343-5
发表时间: 2003-09-01
期刊: MOLECULAR CELL
影响因子: 16
作者:
Osman, F;Dixon, J;Whitby, MC
通讯作者: Whitby, MC