In:
Journal of Bacteriology, American Society for Microbiology, Vol. 180, No. 7 ( 1998-04), p. 1965-1969
Abstract:
A Rhodobacter capsulatus reporter strain, carrying a constitutively expressed nifA gene and a nifH-lacZ gene fusion, was used for random transposon Tn 5 mutagenesis to search for genes required for the NtrC-independent ammonium repression of NifA activity. A mutation in hvrA , which is known to be involved in low-light activation of the photosynthetic apparatus, released both ammonium and oxygen control of nifH expression in this reporter strain, demonstrating a regulatory link of nitrogen fixation and photosynthesis via HvrA. In addition, a significant increase in bacteriochlorophyll a (BChl a ) content was found in cells under nitrogen-fixing conditions. HvrA was not involved in this up-regulation of BChl a . Instead, the presence of active nitrogenase seemed to be sufficient for this process, since no increase in BChl a content was observed in different nif mutants.
Type of Medium:
Online Resource
ISSN:
0021-9193
,
1098-5530
DOI:
10.1128/JB.180.7.1965-1969.1998
Language:
English
Publisher:
American Society for Microbiology
Publication Date:
1998
detail.hit.zdb_id:
2968-3
detail.hit.zdb_id:
1481988-0
SSG:
12
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