GO_REF:0000002

Gene Ontology annotation through association of InterPro records with GO terms

GO_REF:0000041

Gene Ontology annotation based on UniPathway vocabulary mapping

PMID:11069685

A novel NO-responding regulator controls the reduction of nitric oxide in Ralstonia eutropha.

Ralstonia NorR is required for NO-responsive transcription of nitric oxide reductase genes.

"norB1 gene transcription requires a functional rpoN gene and the regulator NorR, a novel member of the NtrC family of response regulators."
NorR controls nitric oxide reduction but not the other denitrification reduction steps.

"This reaction is not strictly co-ordinated on the regulatory level with the other nitrogen oxide-reducing steps of the denitrification chain that are independent of NorR."

PMID:15667304

Transcriptional regulation of nitric oxide reduction in Ralstonia eutropha H16.

NorR is a sigma-54-dependent transcriptional activator that binds upstream activator sequences at norA.

"A NorR derivative containing MalE in place of the N-terminal domain binds to a 73 bp region upstream of norA that includes three copies of the putative upstream activator sequence GGT-(N(7))-ACC."

PMID:16193057

A non-haem iron centre in the transcription factor NorR senses nitric oxide.

NorR-family proteins sense NO through the regulatory domain and couple NO binding to ATPase-dependent transcription activation.

"Binding of NO stimulates the ATPase activity of NorR, enabling the activation of transcription by RNA polymerase."

file:CUPNH/norR1/norR1-uniprot.txt

UniProt record for norR1

UniProt describes NorR1 as required for NO-induced expression of nitric oxide reductase and lists denitrification as regulatory pathway context.

file:CUPNH/norR1/norR1-deep-research-falcon.md

Falcon deep research for norR1

Deep research separates organism-specific Ralstonia/Cupriavidus NorR genetics from family-level NorR mechanism and supports treating NorR1 as an NO-responsive sigma-54 transcriptional activator, not a direct denitrification enzyme.

file:interpro/panther/PTHR32071/PTHR32071-deep-research-falcon.md

Falcon family deep research for PTHR32071 sigma-54-dependent transcriptional regulators

Family research found that sigma-54 enhancer-binding proteins conserve an AAA+ transcription-activation core but diverge mainly through sensory domains and pathway-specific regulatory inputs, supporting a specific NorR regulatory annotation rather than broad BP propagation.