In the absence of SA, NIMIN1/NPR1/TGA complex downregulate the transcriotion of PR1 genes

In the presence of SA activated NPR1/NH1 binds to TGA and the resulting complex promotes transcription of PR1 genes

SSN2, a DNA repair protein has a DNA binding domain which can bind to PR1, and in the presence of SA by complexing with activated NPR1/TGA it promotes the transcription of PR1 its binding to the PR1 (inferred from Arabidopsis thaliana)

WRKY42 negatively regulates the PRI like genes

In the absence of SA SNI1 binds to CBNAC to promote repression of PR1 transcription

WRKY76 is postulated to downregulate defense proteins and compounds