title: Proton magnetic resonance spectra of Rhodospirillum rubrum cytochrome c2.
abstract: Nuclear magnetic resonance spectra of ferro- and ferricytochrome C(2) from the facultative photoheterotroph, Rhodospirillum rubrum, obtained with a 220-MHz spectrometer, are presented. Assignments to protons of various important structural groups in contact with or near the prosthetic heme group are given. These include (a) in the ferro-form, methyl, cbeta and cgamma protons of the extraplanar ligand residue, methionine 91, and methyl protons of the residue leucine 32; and (b) corresponding protons in the ferri-form with the addition of methyl protons from the condensation of a heme vinyl group with cysteine 17, a single proton from the condensation involving cysteine 14, and protons from the ring methyls. These resonances are compared with those corresponding to the same groups in horse heart cytochrome c.
mesh_terms: D055598:Chemical Phenomena; D002621:Chemistry; D003574:Cytochrome c Group; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D008715:Methionine; D011522:Protons; D012247:Rhodospirillum rubrum / Q000201:enzymology*; D013237:Stereoisomerism
chemical_list: D003574:Cytochrome c Group; D008024:Ligands; D011522:Protons; D008715:Methionine