Premium
Sulfide‐dependent hydrogen evolution in the cyanobacterium Oscillatoria limnetica
Author(s) -
Belkin Shimshon,
Padan Etana
Publication year - 1978
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(78)80959-4
Subject(s) - oscillatoria , sulfide , cyanobacteria , hydrogen sulfide , chemistry , chemical engineering , chemical physics , biology , bacteria , sulfur , organic chemistry , paleontology , engineering
Of the oxygenic plant-type phototrophs, only cyanobacteria (blue-green algae) can use both hydrogen and sulfide as electron donors for CO* photoassimilation in a facultative anoxygenic photosystem I-driven reaction [l-6] . This, together with their procaryotic structure, may be relics of the long cyanobacterial evolutionary history [7] . Hydrogen evolution, endogenous or with the aid of artificial electron donors, has also been demonstrated in cyanobacteria, including those capable of facultative anoxygenic photosynthesis with sulfide as electron donor [4,8-l I]. The present work shows that sulfide electrons are passed into the photosynthetic electron transport chain culminating in hydrogen evolution or COz photoassimilation in a photosystem I driven reaction in Oscillatoria limnetica cells. This occurs when the cells are induced to anoxygenic photosynthesis in the presence of sulfide.