Direct probing of solvent accessibility and mobility at the binding interface of polymerase (Dpo4)-DNA complex.
Direct probing of solvent accessibility and mobility at the binding interface of polymerase (Dpo4)-DNA complex.
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DOI:
10.1021/jp410051w
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发表时间:
2013-12-19
期刊:
影响因子:
--
通讯作者:
Zhong D
中科院分区:
文献类型:
--
作者:
Qin Y;Yang Y;Zhang L;Fowler JD;Qiu W;Wang L;Suo Z;Zhong D
Water plays essential structural and dynamical roles in protein-DNA recognition through contributing to enthalpic or entropic stabilization of binding complex and by mediating intermolecular interactions and fluctuations for biological function. These interfacial water molecules are confined by the binding partners in nanospace but in many cases they are highly mobile and exchange with outside bulk solution. Here, we report our studies of the interfacial water dynamics in the binary and ternary complexes of a polymerase (Dpo4) with DNA and an incoming nucleotide using a site-specific tryptophan probe with femtosecond resolution. By systematic comparison of the interfacial water motions and local sidechain fluctuations in the apo, binary and ternary states of Dpo4, we observed that the DNA binding interface and active site is dynamically solvent accessible and the interfacial water dynamics are similar to the surface hydration water fluctuations on picosecond time scales. Our molecular dynamics simulations also show the binding interface full of water molecules and nonspecific weak interactions. Such a fluid binding interface facilitates the polymerase sliding on DNA for fast translocation while the spacious and mobile hydrated active site contributes to the low fidelity of the lesion-bypass Y-family DNA polymerase.
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DOI:
10.1021/jp9048082
发表时间:
2009-10-08
期刊:
The journal of physical chemistry. B
影响因子:
--
作者:
Grebenkov DS;Goddard YA;Diakova G;Korb JP;Bryant RG
通讯作者:
Bryant RG
影响因子:
15
作者:
Chang, Chih-Wei;He, Ting-Fang;Guo, Lijun;Stevens, Jeffrey A.;Li, Tanping;Wang, Lijuan;Zhong, Dongping
通讯作者:
Zhong, Dongping
影响因子:
2.7
作者:
Gorfe, AA;Caflisch, A;Jelesarov, I
通讯作者:
Jelesarov, I
影响因子:
2.9
作者:
Matsika, S
通讯作者:
Matsika, S
影响因子:
2.9
作者:
Fiala, KA;Suo, Z
通讯作者:
Suo, Z