Download MendeleyA novel dimeric structure of the RimL Nalpha-acetyltransferase from Salmonella typhimurium.
Vetting, M.W., de Carvalho, L.P., Roderick, S.L., Blanchard, J.S.(2005) J Biol Chem 280: 22108-22114
- PubMed: 15817456
- DOI: https://doi.org/10.1074/jbc.M502401200
- Primary Citation of Related Structures:
1S7F, 1S7K, 1S7L, 1S7N - PubMed Abstract:
RimL is responsible for converting the prokaryotic ribosomal protein from L12 to L7 by acetylation of its N-terminal amino group. We demonstrate that purified RimL is capable of posttranslationally acetylating L12, exhibiting a V(max) of 21 min(-1). We have also determined the apostructure of RimL from Salmonella typhimurium and its complex with coenzyme A, revealing a homodimeric oligomer with structural similarity to other Gcn5-related N-acetyltransferase superfamily members. A large central trough located at the dimer interface provides sufficient room to bind both L12 N-terminal helices. Structural and biochemical analysis indicates that RimL proceeds by single-step transfer rather than a covalent-enzyme intermediate. This is the first structure of a Gcn5-related N-acetyltransferase family member with demonstrated activity toward a protein N(alpha)-amino group and is a first step toward understanding the molecular basis for N(alpha)acetylation and its function in cellular regulation.
Organizational Affiliation:
Department of Biochemistry, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461-1602, USA.
