Structural comparison of the free and DNA-bound forms of the purine repressor DNA-binding domain.

Structural comparison of the free and DNA-bound forms of the purine repressor DNA-binding domain.
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嘌呤阻遏物 DNA 结合结构域的游离形式和 DNA 结合形式的结构比较。

DOI:
10.1016/s0969-2126(01)00257-x
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发表时间:
1995
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Brennan,RG
Brennan,RG
中科院分区:
--
文献类型:
--
作者:
Nagadoi,A;Morikawa,S;Nakamura,H;Enari,M;Kobayashi,K;Yamamoto,H;Sampei,G;Mizobuchi,K;Schumacher,MA;Brennan,RG

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背景:嘌呤阻遏物(PurR)调节编码嘌呤生物合成酶的基因。PurR具有双结构域结构,具有N-末端DNA结合结构域(DBD)和C-末端辅阻遏物结合结构域(CBD)。最近已确定的三维结构的三元复合物的PurR结合到corepressor和一个特定的DNA序列的X-射线crystallography.ResultsWe确定的溶液结构的PurR DBD的NMR。它含有三个螺旋,第一个和第二个螺旋形成螺旋-转角-螺旋基序。三个螺旋的三级结构与三元复合物中相应区域的三级结构非常相似。然而,铰链螺旋区的结构,这使得特定的碱基接触的DNA的小沟,是无序的DNA-自由form.ConclusionThe稳定形成的PurR铰链螺旋需要PurR二聚化,这使得铰链区彼此接近。铰链螺旋的二聚化可能受CBD二聚化界面控制,但由特异性DNA结合诱导。
Background:The purine repressor (PurR) regulates genes that encode enzymes for purine biosynthesis. PurR has a two domain structure with an N-terminal DNA-binding domain (DBD) and a C-terminal corepressor-binding domain (CBD). The three-dimensional structure of a ternary complex of PurR bound to both corepressor and a specific DNA sequence has recently been determined by X-ray crystallography.ResultsWe have determined the solution structure of the PurR DBD by NMR. It contains three helices, with the first and second helices forming a helix-turn-helix motif. The tertiary structure of the three helices is very similar to that of the corresponding region in the ternary complex. The structure of the hinge helical region, however, which makes specific base contacts in the minor groove of DNA, is disordered in the DNA-free form.ConclusionThe stable formation of PurR hinge helices requires PurR dimerization, which brings the hinge regions proximal to each other. The dimerization of the hinge helices is likely to be controled by the CBD dimerization interface, but is induced by specific-DNA binding.
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发表时间: 1990-01-26
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影响因子: --
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影响因子: 11.1
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