Abstract:
:The hypA-E operon is involved in the maturation of all three NiFe hydrogenases in Escherichia coli. Two hyp promoters have been described; a sigma54-dependent promoter upstream of hypA, and a sigma70-dependent promoter (PhypA) within the hypA coding region. Here it is shown that the oxygen-responsive transcription factor FNR regulates PhypA under anaerobic conditions only. PhypA does not possess a canonical FNR recognition sequence, but two FNR half-sites are present. Studies using PHYPA::lacZ fusions carrying lesions in one or both FNR half-sites indicated that although some residual anaerobic activity was retained by the promoter containing only the downstream FNR half-site, both half-sites are required for maximal PhypA activity in vivo. In vitro gel retardation analysis suggested that the primary interaction occurs at the downstream FNR half-site. Possible explanations for these observations and the implications for other FNR-regulated promoters are discussed.
journal_name
FEMS Microbiol Lettjournal_title
FEMS microbiology lettersauthors
Messenger SL,Green Jdoi
10.1016/S0378-1097(03)00726-2keywords:
subject
Has Abstractpub_date
2003-11-07 00:00:00pages
81-6issue
1eissn
0378-1097issn
1574-6968pii
S0378109703007262journal_volume
228pub_type
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