The 2.2 A structure of the rRNA methyltransferase ErmC' and its complexes with cofactor and cofactor analogs: implications for the reaction mechanism.Schluckebier, G., Zhong, P., Stewart, K.D., Kavanaugh, T.J., Abad-Zapatero, C.
(1999) J.Mol.Biol. 289: 277-291
- PubMed: 10366505
- DOI: 10.1006/jmbi.1999.2788
- Primary Citation of Related Structures:
- PubMed Abstract:
- Crystal structure of ErmC', an RNA-methyltransferase which mediates antibiotic resistance in bacteria
Bussiere, D.E.,Muchmore, S.W.,Dealwis, C.G.,Schluckebier, G.,Nienaber, V.L.,Edalji, R.P.,Walter, K.A.,Ladror, U.S.,Holzman, T.F.,Abad-Zapatero, C.
(1998) Biochemistry 37: 7103
The rRNA methyltransferase ErmC' transfers methyl groups from S -adenosyl-l-methionine to atom N6 of an adenine base within the peptidyltransferase loop of 23 S rRNA, thus conferring antibiotic resistance against a number of macrolide antibiotics. Th ...
The rRNA methyltransferase ErmC' transfers methyl groups from S -adenosyl-l-methionine to atom N6 of an adenine base within the peptidyltransferase loop of 23 S rRNA, thus conferring antibiotic resistance against a number of macrolide antibiotics. The crystal structures of ErmC' and of its complexes with the cofactor S -adenosyl-l-methionine, the reaction product S-adenosyl-l-homocysteine and the methyltransferase inhibitor Sinefungin, respectively, show that the enzyme undergoes small conformational changes upon ligand binding. Overall, the ligand molecules bind to the protein in a similar mode as observed for other methyltransferases. Small differences between the binding of the amino acid parts of the different ligands are correlated with differences in their chemical structure. A model for the transition-state based on the atomic details of the active site is consistent with a one-step methyl-transfer mechanism and might serve as a first step towards the design of potent Erm inhibitors.
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