Condensed phosphate deposition,sulfur amino acid use,and unidirectional transsulfuration in Synechococcus leopoliensis |
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Authors: | Nelson H. Lawry Thomas E. Jensen |
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Affiliation: | (1) R. D. no. 1, Box 452, 03820 Dover, NH, USA;(2) Department of Biological Sciences, Lehman College of the City University of New York, 10468 Bronx, NY, USA |
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Abstract: | Cells of the cyanobacterium, Synechococcus leopoliensis, have previously been shown to exhibit diminished growth, increased condensed phosphate accumulation, enlarged polyphosphate bodies, and severe chlorosis when cultured under conditions of sulfur deficiency. These characteristics were used to identify which of several sulfur amino acids and a tripeptide served as a sole sulfur source for this unicellular microorganism. Completely serving sulfur compounds were l-cystine, dl-lanthionine, l-djenkolic acid, and glutathione. Sulfur amino acids serving poorly or not at all were l-cystathionine, dl-homocystine, l-methionine, l-cysteic acid, and taurine. This pattern of use suggests that the unidirectional transsulfuration pathway demonstrated in enteric bacteria and green plants, i.e. l-cysteine to l-homocysteine, operates as well in cyanobacteria of the Synechococcus type. |
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Keywords: | Blue-green algae Condensed phosphate Cyanobacteria Polyphosphate Sulfur amino acids Synechococcus leopoliensis Transsulfuration |
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