Abstract
SUMMARY: The adaptation of cells of Rhodopseudomonas sphaeroides f. sp. denitrificans for growth under denitrifying conditions in the light has been studied. The presence of nitrate in photosyntheti-cally grown bacterial cultures resulted in a drastic reduction of carotenoid and bacteriochloro-phyll contents as well as a loss of one of the polypeptides of the light harvesting complex, resulting in colour changes. Denitrifying cells had high activities of nitrate, nitrite and nitrous oxide reductases. The polypeptides corresponding to subunits of these enzymes were separated by PAGE. Synthesis of these enzymes was studied by pulse-chase labelling techniques. Nitrate and nitrite reductases are constitutive enzymes and it is likely that copies of mRNA for synthesis of these enzymes are “long lived” in the cells.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
