Photosynthesis-independent regulation of bacteriochlorophyll synthesis by light intensity in Rhodobacter capsulatus

Abstract The amounts of bacteriochlorophyll a in a Rhodobacter capsulatus mutant strain which lacks the light-harvesting I and reaction center complexes were measured in cultures grown with different light intensities. Light intensity regulation of bacteriochlorophyll synthesis was found, manifested...

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Bibliographic Details
Published in:FEMS microbiology letters 1996-12, Vol.145 (2), p.221-225
Main Authors: Yurkova, N., Beatty, J.T.
Format: Article
Language:English
Subjects:
Bacteriochlorophyll
Bacteriochlorophyll synthesis
Enzymatic activity
Gene expression
Light
Light intensity
Light intensity regulation
Light‐harvesting complex II
Luminous intensity
Microbiology
Mutants
Photosynthesis
Rhodobacter capsulatus
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Summary:Abstract The amounts of bacteriochlorophyll a in a Rhodobacter capsulatus mutant strain which lacks the light-harvesting I and reaction center complexes were measured in cultures grown with different light intensities. Light intensity regulation of bacteriochlorophyll synthesis was found, manifested as differences in the amounts of a light harvesting complex II-like absorption peak in vivo, and the amount of organic solvent-extracted bacteriochlorophyll a, in comparisons between low and high light-grown cells. This light regulation was also evaluated by use of puc::lacZ fusions, which indicated that control is exerted independently of puc gene transcription or translation. We suggest that this light regulation might operate at the level of the enzymatic activity of bacteriochlorophyll biosynthetic enzymes.
ISSN:0378-1097
1574-6968
DOI:10.1111/j.1574-6968.1996.tb08581.x