Molecular mechanism of N-terminal acetylation by the ternary NatC complex.

Molecular mechanism of N-terminal acetylation by the ternary NatC complex.
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三元NatC复合物N-末端乙酰化的分子机制。

DOI:
10.1016/j.str.2021.05.003
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发表时间:
2021-10-07
期刊:
Structure (London, England : 1993)
影响因子:
--
通讯作者:
Marmorstein R
Marmorstein R
中科院分区:
其他
文献类型:
--
作者:
Deng S;Gottlieb L;Pan B;Supplee J;Wei X;Petersson EJ;Marmorstein R

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蛋白质N-末端乙酰化主要是核糖体相关修饰,NatA-E是主要的酶。NatC是这些酶中最不寻常的,含有一个Naa 30催化亚基和两个辅助亚基,Naa 35和Naa 38;底物选择性与NatE重叠。本文报道了S.粟酒酵母NatC与NatE/C型双底物类似物和肌醇六磷酸(IP 6),以及相关的生物化学研究。我们发现,三个亚基的存在下,是一个先决条件,正常的NatC乙酰化活性在酵母和IP 6紧密结合NatC,以稳定复杂的。我们还描述了IP 6介导的NatC复合物稳定化的分子基础以及NatC和NatE重叠但不同的底物谱。NatC是蛋白质N-末端乙酰转移酶中一个不寻常的成员,需要一个小的Naa 38亚基的活性。Deng等人发现Naa 38是正常NatC乙酰化所需的,肌醇六磷酸结合有助于酵母NatC复合物的稳定性,并且NatC采用具有独特底物谱的独特NAT结构。
Protein N-terminal acetylation is predominantly a ribosome-associated modification, with NatA-E serving as the major enzymes. NatC is the most unusual of these enzymes, containing one Naa30 catalytic subunit and two auxiliary subunits, Naa35 and Naa38; and substrate selectivity profile that overlaps with NatE. Here, we report the Cryo-EM structure of S. pombe NatC with a NatE/C-type bisubstrate analogue and inositol hexaphosphate (IP6), and associated biochemistry studies. We find that the presence of three subunits is a prerequisite for normal NatC acetylation activity in yeast and that IP6 binds tightly to NatC to stabilize the complex. We also describe the molecular basis for IP6-mediated NatC complex stabilization and the overlapping yet distinct substrate profiles of NatC and NatE. NatC is an unusual member of protein N-terminal acetyltransferases in requiring a small Naa38 subunit for activity. Deng et al. finds that Naa38 is required for normal NatC acetylation, Inositol hexaphosphate binding contributes to yeast NatC complex stability and NatC adopts a unique NAT architecture with a distinct substrate profile.
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