Abstract:
:The volume of electron flow through the cbb3 branch of the electron transport chain and the redox state of the quinone pool generate signals that regulate photosynthesis gene expression in Rhodobacter sphaeroides. An inhibitory signal is generated at the level of the catalytic subunit of the cbb3 cytochrome c oxidase and is transduced through the membrane-localized PrrC polypeptide to the PrrBA two-component activation system, which controls the expression of most of the photosynthesis genes in response to O2. The redox state of the quinone pool is monitored by the redox-active AppA antirepressor protein, which determines the functional state of the PpsR repressor protein. The antirepressor/repressor system as well as a modulator of AppA function, TspO, together with FnrL and PrrA stringently control photopigment gene expression. These regulatory elements, together with spectral complex-specific assembly factors, control the ultimate cellular levels and composition of the photosynthetic membrane.
journal_name
Mol Microbioljournal_title
Molecular microbiologyauthors
Oh JI,Kaplan Sdoi
10.1111/j.1365-2958.2001.02299.xsubject
Has Abstractpub_date
2001-03-01 00:00:00pages
1116-23issue
5eissn
0950-382Xissn
1365-2958pii
mmi2299journal_volume
39pub_type
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