PhotoSynLab

Sulfur in Cyanobacteria

https://www.dropbox.com/s/aouapvzoej3sac2/Aklujkar%282013%29_Microbiol.pdf?dl=0

Papers with this topic:

L.J. STAL and W.E. KRUMBEIN (1984) METABOLISM OF CYANOBACTERIA IN ANAEROBIC MARINE SEDIMENTSGERBAM — Deuxième Colloque International de Bactériologie marine — CNRS, Brest, 1-5 octobre 1984 1FREMER, Actes de Colloques, 3, 1986, pp. 301-309

Reference provided by Niels-Ulrik Frigaard.
This paper cites the two papers below:

Sheridan RP, Castenholz RW (1968) Production of hydrogen sulphide by a thermophilic blue-green alga. Nature, 217: 1063-1064.

Summary

Light has been found to stimulate the production of hydrogen sulphide in the unicellular blue-green alga Synechococcus lividus Copeland (axenic clone Y 52). The culture was initially isolated in 1964 from one of the Fairy Springs, Lower Geyser Basin, Yellowstone National Park. The cells were collected at 52° C and the thiosulphate ion content of the water was probably about 9.0 p.p.m. (ref.

Sheridan R.P. (1973) Hydrogen sulfide production by Synechococcus lividus Y52-s. J Phycology. 9: 437–445

SUMMARY

Under anaerobic conditions and in the absence of CO2, the thermophilic blue-green alga Synechococcus lividus Y52-s, evolved hydrogen sulfide in both darkness and light. The mechanism of this process was investigated and compared with photo- and dark reductions in organisms representing several phyla. The photoproduction of H2S from either sulfate or thiosulfate was inhibited by 3-(3,4-dichlorophenyl)-1, 1-dimethyl urea (DCMU) and carbonyl m-chlorophenyl-hydrazone (m-Cl-CCP). The inhibitory effect of DCMU showed the requirement for photosystem II as electron donor. Inhibition by m-Cl-CCP also implicated ATP as an energy source. Monofluoroacetate partially inhibited photoproduction of H2S. This indicated that oxidative metabolism may act us a source of electrons to reduce the photooxidant under certain conditions. Thiosulfate acts only as electron acceptor and is reductively cleaved to S= and SO3=. Thiosulfate and sulfate appeared to replace CO2 in the light and O2 in darkness as electron acceptors. The phosphorylation uncouplers dinitrophenol and m-Cl-CCP stimulated dark H2S production.

Jorgensen B B (1990) Sulfur cycle of freshwater sediments: role of thiosulfate. Limnol Oceanogr 35: 1329–1342.

Jorgensen B B, Bak F (1991) Pathways and microbiology of thiosulfate transformations and sulfate reduction in a marine sediment (Kattegat, Denmark) Appl Environ Microbiol 57: 847–856.

Jorgensen B B (1994) Sulfate reduction and thiosulfate transformations in a cyanobacterial mat during a diel oxygen cycle. FEMS Microbiol Ecol 13: 303–312.