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Interaction IDMol ATypeSpeciesVerbNatureMol BTypeSpecies
55723TTF1ProteinHomo sapiens-eBinddirectERBB2DNAHomo sapiens-e
TTF-1 binds to and transactivates the erbB-2 and LHRH promoters, but represses transcription of the preproenkephalin gene.
55725TTF1ProteinHomo sapiens-eIncreases activitydirectERBB2DNAHomo sapiens-e
TTF-1 binds to and transactivates the erbB-2 and LHRH promoters, but represses transcription of the preproenkephalin gene.
193130Protein kinase, cAMP-dependent, catalytic subunitSubunit groupHomo sapiens-eIncreases activityindirectTTF1ProteinHomo sapiens-e
We asked whether PKA directly activates TTF1. We show that cAMP/PKA activates pTg and a synthetic target promoter carrying TTF1 binding site repeats in several cell types. Activation depends on TTF1.Phosphopeptide mapping indicates that TTF1 is constitutively phosphorylated at multiple sites, and that cAMP stimulated phosphorylation of one site, serine 337, in vivo. However, alanine substitution at this residue or at all sites of phosphorylation did not reduce PKA activation of pTg. Thus, PKA stimulates TTF1 transcriptional activity in an indirect manner, perhaps by recruiting to or removing from the target promoter another regulatory factor(s).