National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35 GM118090
米国
引用
ジャーナル: Structure / 年: 2021 タイトル: Molecular mechanism of N-terminal acetylation by the ternary NatC complex. 著者: Sunbin Deng / Leah Gottlieb / Buyan Pan / Julianna Supplee / Xuepeng Wei / E James Petersson / Ronen Marmorstein / 要旨: 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 ...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 cryoelectron microscopy structure of S. pombe NatC with a NatE/C-type bisubstrate analog and inositol hexaphosphate (IP), and associated biochemistry studies. We find that the presence of three subunits is a prerequisite for normal NatC acetylation activity in yeast and that IP binds tightly to NatC to stabilize the complex. We also describe the molecular basis for IP-mediated NatC complex stabilization and the overlapping yet distinct substrate profiles of NatC and NatE.