GTP cyclohydrolase 1 feedback regulatory protein is an enzyme that in humans is encoded by the GCHFRgene.[5][6][7]
GTP cyclohydrolase I feedback regulatory protein binds to and mediates tetrahydrobiopterin inhibition of GTP cyclohydrolase I. The regulatory protein, GCHFR, consists of a homodimer. It is postulated that GCHFR may play a role in regulating phenylalanine metabolism in the liver and in the production of biogenic amine neurotransmitters and nitric oxide.[7]
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Bader G, Schiffmann S, Herrmann A, et al. (2001). "Crystal structure of rat GTP cyclohydrolase I feedback regulatory protein, GFRP". J. Mol. Biol. 312 (5): 1051–7. doi:10.1006/jmbi.2001.5011. PMID11580249.
Gesierich A, Niroomand F, Tiefenbacher CP (2003). "Role of human GTP cyclohydrolase I and its regulatory protein in tetrahydrobiopterin metabolism". Basic Res. Cardiol. 98 (2): 69–75. doi:10.1007/s00395-003-0394-y. PMID12607127. S2CID19864675.
Kalivendi S, Hatakeyama K, Whitsett J, et al. (2006). "Changes in tetrahydrobiopterin levels in endothelial cells and adult cardiomyocytes induced by LPS and hydrogen peroxide--a role for GFRP?". Free Radic. Biol. Med. 38 (4): 481–91. doi:10.1016/j.freeradbiomed.2004.11.004. PMID15649650.
Ohta E, Funayama M, Ichinose H, et al. (2006). "Novel mutations in the guanosine triphosphate cyclohydrolase 1 gene associated with DYT5 dystonia". Arch. Neurol. 63 (11): 1605–10. doi:10.1001/archneur.63.11.1605. PMID17101830.
Kontostavlaki DP, Panayotacopoulou MT, Sluijs JA, et al. (2007). "Co-expression of tyrosine hydroxylase and GTP cyclohydrolase I in arginine vasopressin-synthesizing neurons of the human supraoptic nucleus demonstrated by laser microdissection and real-time PCR". Neuroendocrinology. 84 (6): 386–95. doi:10.1159/000097487. PMID17135716. S2CID40550512.