Structure of prokaryotic polyamine deacetylase reveals evolutionary functional relationships with eukaryotic histone deacetylases.

Structure of prokaryotic polyamine deacetylase reveals evolutionary functional relationships with eukaryotic histone deacetylases.
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原核多胺脱乙酰基酶的结构揭示了与真核组织蛋白脱乙酰基酶的进化功能关系。

DOI:
10.1021/bi101859k
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发表时间:
2011-03-22
期刊:
影响因子:
2.9
通讯作者:
Christianson DW
Christianson DW
中科院分区:
生物学3区
文献类型:
--
作者:
Lombardi PM;Angell HD;Whittington DA;Flynn EF;Rajashankar KR;Christianson DW

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多胺是一种普遍存在的聚阳离子小分子,可以通过与核酸结合来影响基因表达。可逆多胺乙酰化调节核酸结合,是正常细胞周期进程和增殖所必需的。在这里,我们报道了分枝杆菌拉莫萨乙酰多胺酰胺水解酶(APAH)与过渡态类似物和羟酸酯抑制剂络合的结构,以及与两种乙酰多胺底物络合的失活突变体的结构。APAH的结构是第一个组蛋白去乙酰酶样低聚物,揭示了L2环中的18个残基插入物促进二聚化,并在二聚体界面形成一个18-Å长的“L”形活性位点隧道,只能通过狭窄和柔性底物进入。二聚体对多胺去乙酰化酶功能的重要性导致人们认为类似的二聚体或双结构域组蛋白去乙酰化酶可以催化真核生物中的多胺去乙酰化反应。
Polyamines are a ubiquitous class of polycationic small molecules that can influence gene expression by binding to nucleic acids. Reversible polyamine acetylation regulates nucleic acid binding and is required for normal cell cycle progression and proliferation. Here, we report the structures of Mycoplana ramosa acetylpolyamine amidohydrolase (APAH) complexed with a transition state analogue and a hydroxamate inhibitor, and an inactive mutant complexed with two acetylpolyamine substrates. The structure of APAH is the first of a histone deacetylase-like oligomer and reveals that an 18-residue insert in the L2 loop promotes dimerization and the formation of an 18-Å long “L”-shaped active site tunnel at the dimer interface, accessible only to narrow and flexible substrates. The importance of dimerization for polyamine deacetylase function leads to the suggestion that a comparable dimeric or double-domain histone deacetylase could catalyze polyamine deacetylation reactions in eukaryotes.
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发表时间: 2009-10-01
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