pfam06399: GFRP (this model, PSSM-Id:399415 is obsolete and has been replaced by 461897)
GTP cyclohydrolase I feedback regulatory protein (GFRP)
Tetrahydrobiopterin, the cofactor required for hydroxylation of aromatic amino acids regulates its own synthesis in via feedback inhibition of GTP cyclohydrolase I. This mechanism is mediated by the regulatory subunit called GTP cyclohydrolase I feedback regulatory protein (GFRP).