The molecular basis for Histone H4- and H2A-specific amino-terminal acetylation by NatD

Robert S. Magin, Glen P. Liszczak, Ronen Marmorstein

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

N-terminal acetylation is among the most common protein modifications in eukaryotes and is mediated by evolutionarily conserved N-terminal acetyltransferases (NATs). NatD is among the most selective NATs; its only known substrates are histones H4 and H2A, containing the N-terminal sequence SGRGK in humans. Here we characterize the molecular basis for substrate-specific acetylation by NatD by reporting its crystal structure bound to cognate substrates and performing related biochemical studies. A novel N-terminal segment wraps around the catalytic core domain to make stabilizing interactions, and the α1-α2 and β6-β7 loops adopt novel conformations to properly orient the histone N termini in the binding site. Ser1 and Arg3 of the histone make extensive contacts to highly conserved NatD residues in the substrate binding pocket, and flanking glycine residues also appear to contribute to substrate-specific binding by NatD, together defining a Ser-Gly-Arg-Gly recognition sequence. These studies have implications for understanding substrate-specific acetylation by NAT enzymes.

Original languageEnglish (US)
Pages (from-to)332-341
Number of pages10
JournalStructure
Volume23
Issue number2
DOIs
StatePublished - Feb 3 2015
Externally publishedYes

ASJC Scopus subject areas

  • Structural Biology
  • Molecular Biology

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