title: NMR analyses of the interactions of human annexin I with ATP, Ca2+, and Mg2+.
abstract: Human annexin I is a member of the annexin family of calcium-dependent phospholipid binding proteins. The structure of an N-terminally truncated human annexin I (delta-annexin I) and its interactions with Ca2+, Mg2+, and ATP were studied at the atomic level using nuclear magnetic resonance (NMR) spectroscopy. Since delta-annexin I is a large protein, with a molecular weight of 35 kDa, a site-specific (carbonyl-13C, amide-15N) labeling technique was used to determine the interaction sites of delta-annexin I with Ca2+, Mg2+, and ATP. The 13C NMR study focused on the carbonyl carbon resonances of the histidine residues of delta-annexin I. We found that ATP binds to delta-annexin I, and that the ATP binding site is located in the 1-domain of annexin I. We also found that histidine-52 is involved in that site, and that the binding ratio of ATP to delta-annexin I is 1:1.
authors.affiliation: Department of Pharmacy, Seoul National University, South Korea.
authors.forename: H Y
authors.initials: HY
authors.lastname: Han
authors.forename: Y H
authors.initials: YH
authors.lastname: Lee
authors.forename: J Y
authors.initials: JY
authors.lastname: Oh
authors.forename: D S
authors.initials: DS
authors.lastname: Na
authors.forename: B J
authors.initials: BJ
authors.lastname: Lee
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism*; D017305:Annexin A1 / Q000378:metabolism*; D001665:Binding Sites / Q000502:physiology; D002118:Calcium / Q000378:metabolism*; D006639:Histidine / Q000737:chemistry; D006801:Humans; D008274:Magnesium / Q000378:metabolism*; D009682:Magnetic Resonance Spectroscopy; D008958:Models, Molecular; D011485:Protein Binding / Q000502:physiology
chemical_list: D017305:Annexin A1; D006639:Histidine; D000255:Adenosine Triphosphate; D008274:Magnesium; D002118:Calcium