6ygc
Crystal structure of the NatC complex bound to Arl3 peptide and CoA
Structural highlights
FunctionNAA30_YEAST Catalytic component of the NatC N-terminal acetyltransferase, which catalyzes acetylation of the N-terminus Met of L-A virus GAG protein and possibly GRH1.[1] [2] Publication Abstract from PubMedThe heterotrimeric NatC complex, comprising the catalytic Naa30 and the two auxiliary subunits Naa35 and Naa38, co-translationally acetylates the N-termini of numerous eukaryotic target proteins. Despite its unique subunit composition, its essential role for many aspects of cellular function and its suggested involvement in disease, structure and mechanism of NatC have remained unknown. Here, we present the crystal structure of the Saccharomyces cerevisiae NatC complex, which exhibits a strikingly different architecture compared to previously described N-terminal acetyltransferase (NAT) complexes. Cofactor and ligand-bound structures reveal how the first four amino acids of cognate substrates are recognized at the Naa30-Naa35 interface. A sequence-specific, ligand-induced conformational change in Naa30 enables efficient acetylation. Based on detailed structure-function studies, we suggest a catalytic mechanism and identify a ribosome-binding patch in an elongated tip region of NatC. Our study reveals how NAT machineries have divergently evolved to N-terminally acetylate specific subsets of target proteins. Divergent architecture of the heterotrimeric NatC complex explains N-terminal acetylation of cognate substrates.,Grunwald S, Hopf LVM, Bock-Bierbaum T, Lally CCM, Spahn CMT, Daumke O Nat Commun. 2020 Nov 2;11(1):5506. doi: 10.1038/s41467-020-19321-8. PMID:33139728[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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