Download MendeleyCan enzymatic activity, or otherwise, be inferred from structural studies of annexin III?
Perron, B., Lewit-Bentley, A., Geny, B., Russo-Marie, F.(1997) J Biol Chem 272: 11321-11326
- PubMed: 9111038
- DOI: https://doi.org/10.1074/jbc.272.17.11321
- Primary Citation of Related Structures:
1AII - PubMed Abstract:
Annexin III, a putative inositol (1,2)-phosphohydrolase, was co-crystallized with inositol 2-phosphate, the inhibitor of the reaction, and its structure was solved to 1.95 A resolution. No enzyme active site was observed in the structure. Assays for enzymatic activity were also negative. Search for annexin III-inositol phosphate interactions using the BIAcoreTM system revealed an affinity for inositol cyclic (1,2)-phosphate, suggesting annexin III may sequester the molecule in the cell. The BIAcoreTM system used with different phospholipids showed that annexin III displays specificity for phosphatidylethanolamine, but not for phosphatidylinositols. Interestingly, a molecule of ethanolamine was found bound to the protein in the crystal structure. Coupled with the fact that this is a particularly abundant phospholipid in granules specific to neutrophils, cells where annexin III is highly expressed, our finding could be pointing to a physiological role of annexin III.
Organizational Affiliation:
Institut Cochin de Génétique Moléculaire, U332 INSERM, 22 rue Méchain, 75014 Paris, France.
