Abstract
The synthesis of nitrate, nitrite, and nitrous oxide reductases is highly enhanced by the addition of nitrate during growth of Rhodobacter sphaeroides forma sp. denitrificans. Contrary to what is observed in many denitrifiers, the synthesis of these enzymes is not repressed by oxygen at concentrations as high as 37% air saturation. When oxygen concentration is increased up to 100% air saturation, the synthesis of nitrite and nitrous oxide reductases is repressed while the nitrate reductase is still synthesized. Two proteins, one periplasmic (35kDa) and the other cytoplasmic (32kDa), are also induced by nitrate, but not by trimethylamine-N-oxide or oxygen. Although their function is not yet known, these two proteins appear to be specifically linked to the denitrification pathway. The amino acid sequences of tryptic peptides and of the N-terminal ends of these proteins indicate no significant similarity with the sequences in the Swiss Prot Data Bank. However, a very good alignment is obtained between the amino acid sequences of the periplasmic nitrate reductase of Alcaligenes eutrophus H16 and those of various tryptic peptides of the nitrate reductase of R. sphaeroides forma sp. denitrificans.
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Abbreviations
- 2D :
-
Two-dimensional
- DTT :
-
Dithiotreitol
- PAGE :
-
Polyacrylamide gel electrophoresis
- TMAO :
-
Trimethylamine-N-oxide
- DMSO :
-
Dimethylsulfoxide
- TMPD N,N,N′,N′ :
-
tetramethyl-p-phenylenediamine
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Sabaty, M., Gagnon, J. & Verméglio, A. Induction by nitrate of cytoplasmic and periplasmic proteins in the photodenitrifier Rhodobacter sphaeroides forma sp. denitrificans under anaerobic or aerobic condition. Arch. Microbiol. 162, 335–343 (1994). https://doi.org/10.1007/BF00263781
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DOI: https://doi.org/10.1007/BF00263781