Photosynthetic apparatus regulatory protein regA REGA_RHOCA MAEEEFAELGSDRSLLLVDDDNAFLTRLARAMEKRGFQTEIAETVSAGKAIVQNRAPAYAVIDLRLEDGNGLEVVEALRERRPEARIVVLTGYGAIATAVAAVKMGATDYLSKPADANDITNALLAKGEALPPPPENPMSADRVRWEHIQRVYELCDRNVSETARRLNMHRRTLQRILAKRSPR regA Member of the two-component regulatory system regB/regA. Involved in transactivating anaerobic expression of the photosynthetic apparatus. It is a transcriptional regulator that is responsible for activating expression of the puf, puh, and puc operons in response to a decrease in oxygen tension. :PTM: Phosphorylated by regB (Probable). 184