Solution structure of the helicase-interaction domain of the primase DnaG: a model for helicase activation.

Solution structure of the helicase-interaction domain of the primase DnaG: a model for helicase activation.
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DOI:
10.1016/j.str.2005.01.022
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发表时间:
2005-04
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Waltho JP
Waltho JP
中科院分区:
其他
文献类型:
--
作者:
Syson K;Thirlway J;Hounslow AM;Soultanas P;Waltho JP

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解旋酶-引物酶相互作用是 DNA 复制中的关键事件,由引物酶内推定的解旋酶相互作用结构域介导。 DnaG 解旋酶相互作用结构域的溶液结构表明,它由两个独立的子结构域组成:N 端六螺旋模块和 C 端二螺旋模块,其中包含先前确定在与解旋酶相互作用中重要的引物酶残基。我们表明,单独的双螺旋模块足以使引物酶和解旋酶之间牢固结合,但无法激活解旋酶;解旋酶激活需要两个子域。引物酶的六螺旋模块只有一个紧密的结构同源物,即相应解旋酶的N端结构域。这种令人惊讶的结构关系,加上两个分子表面特性的差异,表明解旋酶相互作用结构域如何扰乱解旋酶的结构并导致激活。
The helicase-primase interaction is a critical event in DNA replication and is mediated by a putative helicase-interaction domain within the primase. The solution structure of the helicase-interaction domain of DnaG reveals that it is made up of two independent subdomains: an N-terminal six-helix module and a C-terminal two-helix module that contains the residues of the primase previously identified as important in the interaction with the helicase. We show that the two-helix module alone is sufficient for strong binding between the primase and the helicase but fails to activate the helicase; both subdomains are required for helicase activation. The six-helix module of the primase has only one close structural homolog, the N-terminal domain of the corresponding helicase. This surprising structural relationship, coupled with the differences in surface properties of the two molecules, suggests how the helicase-interaction domain may perturb the structure of the helicase and lead to activation.
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