Download MendeleyThe Crystal Structure of Mycobacterium Tuberculosis Adenylate Kinase in Complex with Two Molecules of Adp and Mg2+ Supports an Associative Mechanism for Phosphoryl Transfer.
Bellinzoni, M., Haouz, A., Grana, M., Munier-Lehmann, H., Shepard, W., Alzari, P.M.(2006) Protein Sci 15: 1489
- PubMed: 16672241
- DOI: https://doi.org/10.1110/ps.062163406
- Primary Citation of Related Structures:
2CDN - PubMed Abstract:
The crystal structure of Mycobacterium tuberculosis adenylate kinase (MtAK) in complex with two ADP molecules and Mg2+ has been determined at 1.9 A resolution. Comparison with the solution structure of the enzyme, obtained in the absence of substrates, shows significant conformational changes of the LID and NMP-binding domains upon substrate binding. The ternary complex represents the state of the enzyme at the start of the backward reaction (ATP synthesis). The structure is consistent with a direct nucleophilic attack of a terminal oxygen from the acceptor ADP molecule on the beta-phosphate from the donor substrate, and both the geometry and the distribution of positive charge in the active site support the hypothesis of an associative mechanism for phosphoryl transfer.
- Unité de Biochimie Structurale, CNRS-URA 2185, Institut Pasteur, F-75724 Paris, France.
Organizational Affiliation:
