Environmental context Arsenic biotransformation processes play a key role in the cycling of
arsenic in aquatic systems. We show that a freshwater cyanobacterium can convert …

Abstract O-Acetylserine (thiol)-lyase (cysteine synthase) was purified from Azospirillum
brasilense Sp7. After hydrolysis of the purified protein, amino acid sequences of five …

Sulfide was used as an electron donor early in the evolution of photosynthesis, with many
extant photosynthetic bacteria still capable of using sulfur compounds such as hydrogen …

Reduced inorganic sulfur compounds are utilized by many bacteria as electron donors to
photosynthetic or respiratory electron transport chains. This metabolism is a key component …

Green sulfur bacteria (GSB) constitute a closely related group of photoautotrophic and
thiotrophic bacteria with limited phenotypic variation. They typically oxidize sulfide and …

During sulfur (S) deprivation, the unicellular alga Chlamydomonas reinhardtii exhibits
increased expression of numerous genes. These genes encode proteins associated with …

Purple sulfur bacteria, which are known to be the most ancient among anoxygenic
phototrophs, play an important role in the global sulfur cycle. Allochromatium vinosum …

Sulfur-oxidizing epsilonproteobacteria are common in a variety of sulfidogenic
environments. These autotrophic and mixotrophic sulfur-oxidizing bacteria are believed to …

Despite detailed studies of marine sulfur-oxidizing bacteria, our knowledge concerning their
counterparts in freshwater lake ecosystems is limited. Genome sequencing of the freshwater …

Through the fixation of atmospheric nitrogen and photosynthesis, marine diazotrophs play a
critical role in the global cycling of nitrogen and carbon. Crocosphaera watsonii is a recently …