title: Electron paramagnetic resonance studies of cobalt-substituted angiotensin I-converting enzyme.
abstract: Electron paramagnetic resonance (EPR) spectroscopy has been used to study the metal coordination sphere geometry in the cobalt-substituted Zn-protein angiotensin I-converting enzyme (ACE). It has been shown that ACE contains two distinct metal-binding sites. In the presence of the two structurally different inhibitors, captopril and ramiprilat, it is found that the metal binding sites are nearly structurally identical and are separated more than 10 A from each other. The metal atoms are most likely four- to five-coordinated, and it is argued that the inhibitor binds directly to the metal ion.
authors.affiliation: Department of Biochemistry and Biophysics, Göteborg University, Sweden.
authors.forename: E
authors.initials: E
authors.lastname: Carvalho
authors.forename: R
authors.initials: R
authors.lastname: Aasa
authors.forename: P O
authors.initials: PO
authors.lastname: Göthe
mesh_terms: D000818:Animals; D001665:Binding Sites; D002417:Cattle; D002852:Chromatography, Ion Exchange; D003035:Cobalt; D004578:Electron Spin Resonance Spectroscopy; D007700:Kinetics; D008168:Lung / Q000201:enzymology*; D007703:Peptidyl-Dipeptidase A / Q000737:chemistry* / Q000302:isolation & purification / Q000378:metabolism; D014462:Ultrafiltration; D015032:Zinc
chemical_list: D003035:Cobalt; D007703:Peptidyl-Dipeptidase A; D015032:Zinc