This model represents the transcriptional regulator PpsR which is strictly associated with photosynthetic proteobacteria and found in photosynthetic operons. PpsR has been reported to be a repressor. These proteins contain a Helix-Turn_Helix motif of the "fis" type (pfam02954). [Energy metabolism, Photosynthesis, Regulatory functions, DNA interactions]
Jiyao W et al.(2023). "The conserved domain database in 2023.",