GO biological process

regulation of transcription, DNA-dependent (GO:0006355), signal transduction (GO:0007165), detection of visible light (GO:0009584), red, far-red light phototransduction (GO:0009585), protein-tetrapyrrole linkage (GO:0017006), peptidyl-histidine phosphorylation (GO:0018106), protein-chromophore linkage (GO:0018298)

GO cellular component

membrane (GO:0016020)

GO molecular function

two-component sensor activity (GO:0000155), protein histidine kinase activity (GO:0004673), signal transducer activity (GO:0004871), protein binding (GO:0005515), ATP binding (GO:0005524), G-protein coupled photoreceptor activity (GO:0008020), photoreceptor activity (GO:0009881), protein homodimerization activity (GO:0042803)