Abstract:
:The photosynthetic bacterium Rhodobacter sulfidophilus is able to grow chemotrophically and phototrophically at a broad range of light intensities. In contrast to other facultative phototrophs, R. sulfidophilus synthesizes reaction center and light-harvesting (LH) complexes, B870 (LHI) and B800-850 (LHII) even under full aerobic conditions in the dark. The content of bacteriochlorophyll (BChl) varied from 3.8 micrograms Bchl per mg cell protein when grown at high light intensity (20,000 lux) to 60 micrograms Bchl per mg cell protein when grown at low light intensities (6 lux). After a shift from high light to low light conditions, the size of the photosynthetic unit increased by a factor of 4. Chromatographic analysis of the LHII complex, isolated and purified from cells grown phototrophically (at high and low light intensities) and chemotrophically, could resolve only one type of alpha and one type of beta polypeptide in the purified complex, of which the N-terminal sequences have been determined.
journal_name
FEMS Microbiol Lettjournal_title
FEMS microbiology lettersauthors
Hagemann GE,Gad'on N,Garcia A,Drews G,Tadros MHdoi
10.1111/j.1574-6968.1995.tb07382.xsubject
Has Abstractpub_date
1995-02-01 00:00:00pages
7-11issue
1eissn
0378-1097issn
1574-6968pii
037810979400518Vjournal_volume
126pub_type
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