title: Spectroscopic investigations of Panulirus interruptus hemocyanin in the crystalline state.
abstract: Single-crystal ultraviolet spectroscopy, X-ray absorption spectroscopy and EPR measurements have been used to examine the oxidation and oxygenation state of the dinuclear copper site of several types of hemocyanin crystals. The crystals contain Panulirus interruptus hemocyanin which forms hexameric molecules with a molecular mass of approximately 470 kDa. Three types of crystals have been investigated. Type-I monoclinic crystals, which have been used for the X-ray structure determination, contain virtually only deoxyhemocyanin. Type-II monoclinic crystals, which are less well ordered than the type-I crystals, contain a mixture of deoxy, oxy and met forms. Older crystals contain relatively more methemocyanin. A third, hexagonal, crystal form is also partially oxygenated, and, like the type-II monoclinic form, subject to gradual conversion to methemocyanin.
authors.affiliation: Laboratory of Chemical Physics, University of Groningen, The Netherlands.
authors.forename: A
authors.initials: A
authors.lastname: Volbeda
authors.forename: M C
authors.initials: MC
authors.lastname: Feiters
authors.forename: M G
authors.initials: MG
authors.lastname: Vincent
authors.forename: E
authors.initials: E
authors.lastname: Bouwman
authors.forename: B
authors.initials: B
authors.lastname: Dobson
authors.forename: K H
authors.initials: KH
authors.lastname: Kalk
authors.forename: J
authors.initials: J
authors.lastname: Reedijk
authors.forename: W G
authors.initials: WG
authors.lastname: Hol
mesh_terms: D000818:Animals; D003300:Copper / Q000032:analysis; D003460:Crystallization; D004578:Electron Spin Resonance Spectroscopy; D006433:Hemocyanins / Q000031:analogs & derivatives / Q000032:analysis*; D008121:Nephropidae / Q000378:metabolism*; D010084:Oxidation-Reduction; D013056:Spectrophotometry, Ultraviolet; D013057:Spectrum Analysis; D014965:X-Rays
chemical_list: C019325:deoxyhemocyanin; C015985:methemocyanin; D003300:Copper; D006433:Hemocyanins