1fb1: Difference between revisions
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|PDB= 1fb1 |SIZE=350|CAPTION= <scene name='initialview01'>1fb1</scene>, resolution 3.10Å | |PDB= 1fb1 |SIZE=350|CAPTION= <scene name='initialview01'>1fb1</scene>, resolution 3.10Å | ||
|SITE= | |SITE= | ||
|LIGAND= <scene name='pdbligand= | |LIGAND= <scene name='pdbligand=IPA:ISOPROPYL+ALCOHOL'>IPA</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> | ||
|ACTIVITY= [http://en.wikipedia.org/wiki/GTP_cyclohydrolase_I GTP cyclohydrolase I], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.4.16 3.5.4.16] | |ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/GTP_cyclohydrolase_I GTP cyclohydrolase I], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.5.4.16 3.5.4.16] </span> | ||
|GENE= | |GENE= | ||
|DOMAIN= | |||
|RELATEDENTRY= | |||
|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1fb1 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1fb1 OCA], [http://www.ebi.ac.uk/pdbsum/1fb1 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1fb1 RCSB]</span> | |||
}} | }} | ||
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==Overview== | ==Overview== | ||
The crystal structure of recombinant human GTP cyclohydrolase I was solved by Patterson search methods by using the coordinates of the Escherichia coli enzyme as a model. The human as well as bacterial enzyme were shown to contain an essential zinc ion coordinated to a His side chain and two thiol groups in each active site of the homodecameric enzymes that had escaped detection during earlier studies of the E. coli enzyme. The zinc ion is proposed to generate a hydroxyl nucleophile for attack of imidazole ring carbon atom eight of the substrate, GTP. It may also be involved in the hydrolytic release of formate from the intermediate, 2-amino-5-formylamino-6-ribosylamino-4(3H)-pyrimidinone 5'-triphosphate, and in the consecutive Amadori rearrangement of the ribosyl moiety. | The crystal structure of recombinant human GTP cyclohydrolase I was solved by Patterson search methods by using the coordinates of the Escherichia coli enzyme as a model. The human as well as bacterial enzyme were shown to contain an essential zinc ion coordinated to a His side chain and two thiol groups in each active site of the homodecameric enzymes that had escaped detection during earlier studies of the E. coli enzyme. The zinc ion is proposed to generate a hydroxyl nucleophile for attack of imidazole ring carbon atom eight of the substrate, GTP. It may also be involved in the hydrolytic release of formate from the intermediate, 2-amino-5-formylamino-6-ribosylamino-4(3H)-pyrimidinone 5'-triphosphate, and in the consecutive Amadori rearrangement of the ribosyl moiety. | ||
==About this Structure== | ==About this Structure== | ||
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[[Category: Neukamm, M.]] | [[Category: Neukamm, M.]] | ||
[[Category: Richardson, J.]] | [[Category: Richardson, J.]] | ||
[[Category: allosteric enzyme]] | [[Category: allosteric enzyme]] | ||
[[Category: hydrolase]] | [[Category: hydrolase]] | ||
[[Category: phosphorylation]] | [[Category: phosphorylation]] | ||
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 20:19:24 2008'' | ||
Revision as of 17:19, 30 March 2008
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| 1fb1, resolution 3.10Å | |||||||||||||
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| Ligands: | IPA, ZN | ||||||||||||
| Activity: | GTP cyclohydrolase I, with EC number 3.5.4.16 | ||||||||||||
| Resources: | FirstGlance, OCA, PDBsum, RCSB | ||||||||||||
| Coordinates: | save as pdb, mmCIF, xml | ||||||||||||
CRYSTAL STRUCTURE OF HUMAN GTP CYCLOHYDROLASE I
Overview
The crystal structure of recombinant human GTP cyclohydrolase I was solved by Patterson search methods by using the coordinates of the Escherichia coli enzyme as a model. The human as well as bacterial enzyme were shown to contain an essential zinc ion coordinated to a His side chain and two thiol groups in each active site of the homodecameric enzymes that had escaped detection during earlier studies of the E. coli enzyme. The zinc ion is proposed to generate a hydroxyl nucleophile for attack of imidazole ring carbon atom eight of the substrate, GTP. It may also be involved in the hydrolytic release of formate from the intermediate, 2-amino-5-formylamino-6-ribosylamino-4(3H)-pyrimidinone 5'-triphosphate, and in the consecutive Amadori rearrangement of the ribosyl moiety.
About this Structure
1FB1 is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Zinc plays a key role in human and bacterial GTP cyclohydrolase I., Auerbach G, Herrmann A, Bracher A, Bader G, Gutlich M, Fischer M, Neukamm M, Garrido-Franco M, Richardson J, Nar H, Huber R, Bacher A, Proc Natl Acad Sci U S A. 2000 Dec 5;97(25):13567-72. PMID:11087827
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