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TitleA hybrid approach reveals the allosteric regulation of GTP cyclohydrolase I.
Journal, issue, pagesProc Natl Acad Sci U S A, Vol. 117, Issue 50, Page 31838-31849, Year 2020
Publish dateDec 15, 2020
AuthorsRebecca Ebenhoch / Simone Prinz / Susann Kaltwasser / Deryck J Mills / Robert Meinecke / Martin Rübbelke / Dirk Reinert / Margit Bauer / Lisa Weixler / Markus Zeeb / Janet Vonck / Herbert Nar /
PubMed AbstractGuanosine triphosphate (GTP) cyclohydrolase I (GCH1) catalyzes the conversion of GTP to dihydroneopterin triphosphate (H2NTP), the initiating step in the biosynthesis of tetrahydrobiopterin (BH4). ...Guanosine triphosphate (GTP) cyclohydrolase I (GCH1) catalyzes the conversion of GTP to dihydroneopterin triphosphate (H2NTP), the initiating step in the biosynthesis of tetrahydrobiopterin (BH4). Besides other roles, BH4 functions as cofactor in neurotransmitter biosynthesis. The BH4 biosynthetic pathway and GCH1 have been identified as promising targets to treat pain disorders in patients. The function of mammalian GCH1s is regulated by a metabolic sensing mechanism involving a regulator protein, GCH1 feedback regulatory protein (GFRP). GFRP binds to GCH1 to form inhibited or activated complexes dependent on availability of cofactor ligands, BH4 and phenylalanine, respectively. We determined high-resolution structures of human GCH1-GFRP complexes by cryoelectron microscopy (cryo-EM). Cryo-EM revealed structural flexibility of specific and relevant surface lining loops, which previously was not detected by X-ray crystallography due to crystal packing effects. Further, we studied allosteric regulation of isolated GCH1 by X-ray crystallography. Using the combined structural information, we are able to obtain a comprehensive picture of the mechanism of allosteric regulation. Local rearrangements in the allosteric pocket upon BH4 binding result in drastic changes in the quaternary structure of the enzyme, leading to a more compact, tense form of the inhibited protein, and translocate to the active site, leading to an open, more flexible structure of its surroundings. Inhibition of the enzymatic activity is not a result of hindrance of substrate binding, but rather a consequence of accelerated substrate binding kinetics as shown by saturation transfer difference NMR (STD-NMR) and site-directed mutagenesis. We propose a dissociation rate controlled mechanism of allosteric, noncompetitive inhibition.
External linksProc Natl Acad Sci U S A / PubMed:33229582 / PubMed Central
MethodsEM (single particle) / X-ray diffraction
Resolution1.726 - 3.0 Å
Structure data

11113

6z80

EMDB-11113, PDB-6z80:
stimulatory human GTP cyclohydrolase I - GFRP complex
Method: EM (single particle) / Resolution: 3.0 Å

11114

6z85

EMDB-11114, PDB-6z85:
inhibitory human GTP cyclohydrolase I - GFRP complex
Method: EM (single particle) / Resolution: 2.9 Å

PDB-6z86:
human GTP cyclohydrolase I in complex with 7-deaza-GTP
Method: X-RAY DIFFRACTION / Resolution: 2.206 Å

PDB-6z87:
human GTP cyclohydrolase I
Method: X-RAY DIFFRACTION / Resolution: 2.564 Å

PDB-6z88:
human GTP cyclohydrolase I in complex with allosteric inhibitor
Method: X-RAY DIFFRACTION / Resolution: 2.687 Å

PDB-6z89:
human GTP cyclohydrolase I in complex with allosteric inhibitor
Method: X-RAY DIFFRACTION / Resolution: 2.366 Å

PDB-7acc:
human GTP cyclohydrolase I feedback regulatory protein (GFRP)
Method: X-RAY DIFFRACTION / Resolution: 2.04 Å

PDB-7al9:
human GTP cyclohydrolase I feedback regulatory protein (GFRP) in complex with phenylalanine
Method: X-RAY DIFFRACTION / Resolution: 1.745 Å

PDB-7ala:
human GCH-GFRP inhibitory complex
Method: X-RAY DIFFRACTION / Resolution: 1.846 Å

PDB-7alb:
human GCH-GFRP stimulatory complex 7-deaza-GTP bound
Method: X-RAY DIFFRACTION / Resolution: 1.979 Å

PDB-7alc:
human GCH-GFRP stimulatory complex
Method: X-RAY DIFFRACTION / Resolution: 1.726 Å

Chemicals

ChemComp-ZN:
Unknown entry

ChemComp-PHE:
PHENYLALANINE

ChemComp-8GT:
8-OXO-GUANOSINE-5'-TRIPHOSPHATE

ChemComp-HBI:
7,8-DIHYDROBIOPTERIN

ChemComp-QBQ:
7-deaza-GTP

ChemComp-HOH:
WATER

ChemComp-QBK:
5-azanyl-[1,3]thiazolo[5,4-d]pyrimidine-2,7-dione

ChemComp-K:
Unknown entry

ChemComp-5RW:
2-azanyl-8-[(4-fluorophenyl)methylsulfanyl]-1,7-dihydropurin-6-one

ChemComp-NA:
Unknown entry

Source
  • homo sapiens (human)
KeywordsHYDROLASE / GTP cyclohydrolase GFTP / I / EC:3.5.4.16 / Tetrahydrobiopterin (BH4) synthesis / Cytosol / Zinc Ion Binding / Hydrolase Activity / Metal Ion Binding / Nucleotide Binding / allosteric enzyme / substrate analogue bound / allosteric inhibited / GTP cyclohydrolase I / allosteric inhibitor / PROTEIN BINDING / GTP cyclohydrolase 1 feedback regulatory protein / regulatory protein / L-phenylalanine binding (Phe) synthesis allosteric regulation / GTP cyclohydrolase 1 / GTPCH1 / GTP cyclohydrolase I regulatory protein / GFRP / allosteric regulation / complex / allosteric regulator

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