Flexibility and Communication within the Structure of the Mycobacterium Smegmatis Methionyl-tRNA Synthetase.Ingvarsson, H., Unge, T.
(2010) FEBS J. 277: 3947
- PubMed: 20796028
- DOI: 10.1111/j.1742-4658.2010.07784.x
- Primary Citation of Related Structures:
- PubMed Abstract:
- Crystallization of Mycobacterium Smegmatis Methionyl-tRNA Synthetase in the Presence of Methionine and Adenosine.
Ingvarsson, H.,Jones, T.A.,Unge, T.
(2009) Acta Crystallogr.,Sect.F 65: 618
Two structures of monomeric methionyl-tRNA synthetase, from Mycobacterium smegmatis, in complex with the ligands methionine/adenosine and methionine, were analyzed by X-ray crystallography at 2.3 Å and at 2.8 Å, respectively. The structures demonstra ...
Two structures of monomeric methionyl-tRNA synthetase, from Mycobacterium smegmatis, in complex with the ligands methionine/adenosine and methionine, were analyzed by X-ray crystallography at 2.3 Å and at 2.8 Å, respectively. The structures demonstrated the flexibility of the multidomain enzyme. A new conformation of the structure was identified in which the connective peptide domain bound more closely to the catalytic domain than described previously. The KMSKS(301-305) loop in our structures was in an open and inactive conformation that differed from previous structures by a rotation of the loop of about 90° around hinges located at Asn297 and Val310. The binding of adenosine to the methionyl-tRNA synthetase methionine complex caused a shift in the KMSKS domain that brought it closer to the catalytic domain. The potential use of the adenosine-binding site for inhibitor binding was evaluated and a potential binding site for a specific allosteric inhibitor was identified.
Department of Cell and Molecular Biology, Uppsala Biomedical Center, Uppsala University, Uppsala, Sweden.