FIG. 1.
Proposed electron transfer pathways in the light involved in H2 production and uptake in Synechocystis sp. strain PCC 6803. Abbreviations: H2ase, hydrogenase; PS I, photosystem I; PS II, photosystem II; cyt, cytochrome; cyt b6f, cytochrome b6f complex; cyt ox, cytochrome aa3 oxidase; SDH, succinate dehydrogenase; NDH-1, type I NAD(P)H-dehydrogenase; PQ, plastoquinone; PC, plastocyanin; FNR, ferredoxin-NADP+ reductase; Fd, ferredoxin. Electron transfers are represented by solid arrows; DCMU and DBMIB inhibition sites are indicated by thick white arrows. Enzyme names are in italics. Grey flash arrows indicate pathways which are impaired in the ndhB mutant M55.