EPR characteristics of chloride-depleted photosystem II membranes in the presence of other anions.
Chloride is an essential cofactor for the oxidation of water to oxygen. Anion substitution (Br(-), I(-), NO(2)(-), F(-)) in Cl(-)-depleted PS II membranes brings out significant changes in the EPR signals arising from the S(2) state and from the iron-quinone complex of PS II. On the basis of the changes observed in the S(2) state multiline signal and the Q(A)Fe(3+) EPR signal in Cl(-)-depleted PS II membranes after substituting with various anions, we report a possible binding site of anions such as chloride and bromide at the PS II donor side as well as at the acceptor side.
Jajoo
Anjana
A
School of Life Sciences, Vigyan Bhawan Khandwa Road, Devi Ahilya Vishwavidyalaya, Indore 452 017, M.P., India. anjanajajoo@hotmail.com
Bharti
Sudhakar
S
Kawamori
Asako
A
D000838:Anions / Q000737:chemistry* / Q000528:radiation effects; D002712:Chlorides / Q000737:chemistry* / Q000528:radiation effects; D004578:Electron Spin Resonance Spectroscopy / Q000379:methods; D007425:Intracellular Membranes / Q000737:chemistry; D008280:Magnetics; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry / Q000528:radiation effects; D045332:Photosystem II Protein Complex / Q000737:chemistry* / Q000528:radiation effects; D011809:Quinones / Q000737:chemistry / Q000528:radiation effects
D000838:Anions; D002712:Chlorides; D045332:Photosystem II Protein Complex; D011809:Quinones; D010100:Oxygen