engleski

Redox regulation of photosynthesis - Z-scheme requires TROL

Molecular mechanisms involved in regulation of the fundamental process of oxygenic photosynthesis appear to be much more complex then previously anticipated. Particularly, various auxiliary proteins linking photosynthesis with physiological responses are still missing. Recently, several protein kinases involved in photosystem II phosphorylation and photosynthetic acclimation have been characterized. It has been proposed that those processes are regulated via redox-state of the thylakoid membrane. By using antisense and gene inactivation strategies we have identified a novel component of non-apressed thylakoid membranes which is responsible for anchoring of ferredoxin-NAD(P)+ oxidoreductase, the enzyme which catalyses the final electron transfer of oxygenic photosynthesis from ferredoxin to NAD(P). Depletion of this integral membrane protein entitled TROL (thylakoid rhodanese-like protein) leads to an over-reduction of photosynthetic machinery in conditions of elevated light intensity. Thus, TROL is necessary for sustaining of linear electron flow, as well as for redox-regulation of key thylakoid signal-transduction pathways.

chloroplast; photosynthesis; FNR; thylakoid membranes

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