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Spin trapping evidence for formation of the sulfite radical anion during chloroplast-mediated oxidation of bisulfite ion

1985; Elsevier BV; Volume: 843; Issue: 1-2 Linguagem: Inglês

10.1016/0304-4165(85)90062-5

1872-8006

Patrick S. Covello, J. E. Thompson,

Photosynthetic Processes and Mechanisms

Abstract Spin trapping experiments have provided evidence for formation of the sulfite radical anion (SO3−) as an intermediate in the chloroplast-catalyzed oxidation of bisulfite ion. Formation of SO3− is inhibited by superoxide dismutase, but there is no enhanced production of superoxide (O2−). Thus, O2− appears to be involved in the initiation of chloroplast-mediated sulfite oxidation but not in propagation of the free radical chain reaction.