Abstract
Tetrabromo-4-hydroxypyridine (J820) inhibited ferredoxin-catalysed cyclic photophosphorylation at micromolar concentrations but did not inhibit or uncouple the AQS-catalysed system. At 2 μM it did not abolish the slow phase of the electrochromic shift or affect the turnover of cytochromes b-563 and f. At higher concentrations (10 μM) it decreased the rate of re-reduction of cytochrome f, whilst inhibiting the reduction of cytochrome b-563. It is concluded that tetrabromo-4-hydroxpyridine does not bind to the quinone reduction site of the cytochrome bf complex, but inhibits the putative ferredoxin-plastoquinone reductase.
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