Relationship of structure and function of DNA-binding domain in vitamin D receptor.

Relationship of structure and function of DNA-binding domain in vitamin D receptor.
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维生素D受体DNA结合域结构与功能的关系

DOI:
10.3390/molecules200712389
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发表时间:
2015-07-07
期刊:
Molecules (Basel, Switzerland)
影响因子:
--
通讯作者:
Wu JF
Wu JF
中科院分区:
其他
文献类型:
--
作者:
Wan LY;Zhang YQ;Chen MD;Liu CB;Wu JF

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虽然维生素D受体(VDR)的DNA结合结构域(DBD)的结构已被非常详细地确定,但其结构域的作用以及如何结合其靶基因的基序仍存在争议。VDR DBD由两个锌指模块和一个C-末端延伸(CTE)组成,每个结构的C-末端末端呈现α-螺旋。在第一锌指结构中,N37和S-box参与与9-顺式维甲酸X受体(RXR)形成二聚体,V26、R50、P-box和S-box参与与VDR反应元件(VDRE)结合。对于第二锌指结构,P61、F62和H75在VDR同源二聚体的结构中是必需的,其具有配偶体VDR下游的残基N37、E92和F93,其形成DBD间界面。CTE的T盒,特别是F93和I94,在异源二聚体化和异源二聚体-VDRE结合中起关键作用。VDR的CTE α-螺旋的六个必需残基(R102、K103、M106、I107、K109和R110)构成一个相互作用面,其与相邻对称配对物的DBD核心挤压。在1,25(OH)2D 3激活的信号传导中,VDR-RXR异二聚体可以与其靶基因的DR 3型VDRE和ER 9型VDRE结合,直接导致反式激活,也可以与其靶基因的DR 3样nVDRE结合,直接导致反式阻遏。除此之外,1α,25(OH)2D 3配体VDR-RXR可能通过VEGFR 2与1αnVDRE间接结合,导致靶基因的反式阻遏。结合1α,25(OH)2D 3后,VDR可反式激活和反式抑制其靶基因,这取决于DBD结合的DNA基序。
While the structure of the DNA-binding domain (DBD) of the vitamin D receptor (VDR) has been determined in great detail, the roles of its domains and how to bind the motif of its target genes are still under debate. The VDR DBD consists of two zinc finger modules and a C-terminal extension (CTE), at the end of the C-terminal of each structure presenting α-helix. For the first zinc finger structure, N37 and S-box take part in forming a dimer with 9-cis retinoid X receptor (RXR), while V26, R50, P-box and S-box participate in binding with VDR response elements (VDRE). For the second zinc finger structure, P61, F62 and H75 are essential in the structure of the VDR homodimer with the residues N37, E92 and F93 of the downstream of partner VDR, which form the inter-DBD interface. T-box of the CTE, especially the F93 and I94, plays a critical role in heterodimerization and heterodimers–VDRE binding. Six essential residues (R102, K103, M106, I107, K109, and R110) of the CTE α-helix of VDR construct one interaction face, which packs against the DBD core of the adjacent symmetry mate. In 1,25(OH)2D3-activated signaling, the VDR-RXR heterodimer may bind to DR3-type VDRE and ER9-type VDREs of its target gene directly resulting in transactivation and also bind to DR3-liked nVDRE of its target gene directly resulting in transrepression. Except for this, 1α,25(OH)2D3 ligand VDR-RXR may bind to 1αnVDRE indirectly through VDIR, resulting in transrepression of the target gene. Upon binding of 1α,25(OH)2D3, VDR can transactivate and transrepress its target genes depending on the DNA motif that DBD binds.
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