1hq2

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[[Image:1hq2.gif|left|200px]]
[[Image:1hq2.gif|left|200px]]
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{{Structure
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<!--
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|PDB= 1hq2 |SIZE=350|CAPTION= <scene name='initialview01'>1hq2</scene>, resolution 1.25&Aring;
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The line below this paragraph, containing "STRUCTURE_1hq2", creates the "Structure Box" on the page.
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|SITE=
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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|LIGAND= <scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=APC:DIPHOSPHOMETHYLPHOSPHONIC+ACID+ADENOSYL+ESTER'>APC</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=PH2:2-AMINO-6-HYDROXYMETHYL-7,8-DIHYDRO-3H-PTERIDIN-4-ONE'>PH2</scene>
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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|ACTIVITY= <span class='plainlinks'>[http://en.wikipedia.org/wiki/2-amino-4-hydroxy-6-hydroxymethyldihydropteridine_diphosphokinase 2-amino-4-hydroxy-6-hydroxymethyldihydropteridine diphosphokinase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.7.6.3 2.7.6.3] </span>
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or leave the SCENE parameter empty for the default display.
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|GENE=
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|DOMAIN=
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{{STRUCTURE_1hq2| PDB=1hq2 | SCENE= }}
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|RELATEDENTRY=[[1hka|1HKA]], [[1eqm|1EQM]], [[1eq0|1EQ0]], [[1eqo|1EQO]], [[1ex8|1EX8]], [[1cbk|1CBK]], [[1dy3|1DY3]], [[1f9y|1F9Y]], [[1f9h|1F9H]], [[1g4c|1G4C]]
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|RESOURCES=<span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1hq2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1hq2 OCA], [http://www.ebi.ac.uk/pdbsum/1hq2 PDBsum], [http://www.rcsb.org/pdb/explore.do?structureId=1hq2 RCSB]</span>
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}}
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'''CRYSTAL STRUCTURE OF A TERNARY COMPLEX OF E.COLI HPPK(R82A) WITH MGAMPCPP AND 6-HYDROXYMETHYL-7,8-DIHYDROPTERIN AT 1.25 ANGSTROM RESOLUTION'''
'''CRYSTAL STRUCTURE OF A TERNARY COMPLEX OF E.COLI HPPK(R82A) WITH MGAMPCPP AND 6-HYDROXYMETHYL-7,8-DIHYDROPTERIN AT 1.25 ANGSTROM RESOLUTION'''
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[[Category: Ji, X.]]
[[Category: Ji, X.]]
[[Category: 6-hydroxymethyl-7,8-dihydropterin]]
[[Category: 6-hydroxymethyl-7,8-dihydropterin]]
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[[Category: antimicrobial agent]]
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[[Category: Antimicrobial agent]]
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[[Category: catalytic mechanism]]
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[[Category: Catalytic mechanism]]
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[[Category: drug design]]
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[[Category: Drug design]]
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[[Category: folate]]
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[[Category: Folate]]
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[[Category: hppk]]
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[[Category: Hppk]]
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[[Category: pterin]]
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[[Category: Pterin]]
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[[Category: pyrophosphokinase]]
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[[Category: Pyrophosphokinase]]
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[[Category: pyrophosphoryl transfer]]
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[[Category: Pyrophosphoryl transfer]]
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[[Category: substrate specificity]]
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[[Category: Substrate specificity]]
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[[Category: ternary complex]]
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[[Category: Ternary complex]]
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[[Category: x-ray crystallography]]
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[[Category: X-ray crystallography]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 19:06:32 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 30 21:08:58 2008''
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Revision as of 16:06, 2 May 2008

Image:1hq2.gif

Template:STRUCTURE 1hq2

CRYSTAL STRUCTURE OF A TERNARY COMPLEX OF E.COLI HPPK(R82A) WITH MGAMPCPP AND 6-HYDROXYMETHYL-7,8-DIHYDROPTERIN AT 1.25 ANGSTROM RESOLUTION


Overview

6-Hydroxymethyl-7,8-dihydropterin pyrophosphokinase (HPPK) catalyzes the pyrophosphoryl transfer from ATP to 6-hydroxymethyl-7,8-dihydropterin (HP), the first reaction in the folate biosynthetic pathway. Arginine residues 82 and 92, strictly conserved in 35 HPPK sequences, play dynamic roles in the catalytic cycle of the enzyme. At 0.89-A resolution, two distinct conformations are observed for each of the two residues in the crystal structure of the wild-type HPPK in complex with two HP variants, two Mg(2+) ions, and an ATP analogue. Structural information suggests that R92 first binds to the alpha-phosphate group of ATP and then shifts to interact with the beta-phosphate as R82, which initially does not bind to ATP, moves in and binds to alpha-phosphate when the pyrophosphoryl transfer is about to occur. The dynamic roles of R82 and R92 are further elucidated by five more crystal structures of two mutant proteins, R82A and R92A, with and without bound ligands. Two oxidized forms of HP are observed with an occupancy ratio of 0.50:0.50 in the 0.89-A structure. The oxidation of HP has significant impact on its binding to the protein as well as the conformation of nearby residue W89.

About this Structure

1HQ2 is a Single protein structure of sequence from Escherichia coli. Full crystallographic information is available from OCA.

Reference

Dynamic roles of arginine residues 82 and 92 of Escherichia coli 6-hydroxymethyl-7,8-dihydropterin pyrophosphokinase: crystallographic studies., Blaszczyk J, Li Y, Shi G, Yan H, Ji X, Biochemistry. 2003 Feb 18;42(6):1573-80. PMID:12578370 Page seeded by OCA on Fri May 2 19:06:32 2008

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