In this issue of Structure, Deng et al. (2019) determine the structure of the yeast N-terminal acetyltransferases Naa10 and Naa50 in complex with Naa15 and demonstrate that Naa50 has negligible catalytic activity on its own but modulates Naa10/Naa15. This study provides insights into mechanisms involving amino-terminal acetylation of proteins.
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