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1ox5

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Revision as of 07:17, 9 December 2020

TOWARDS UNDERSTANDING THE MECHANISM OF THE COMPLEX CYCLIZATION REACTION CATALYZED BY IMIDAZOLE GLYCEROPHOSPHATE SYNTHASE

Structural highlights

1ox5 is a 2 chain structure with sequence from Atcc 18824. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
NonStd Res:
Related:	1jvn, 1ox4, 1ox6
Gene:	HIS7 (ATCC 18824)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[HIS5_YEAST] IGPS catalyzes the conversion of PRFAR and glutamine to IGP, AICAR and glutamate. The glutamine amidotransferase domain provides the ammonia necessary to the cyclase domain to produce IGP and AICAR from PRFAR.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Imidazole glycerol phosphate synthase catalyzes formation of the imidazole ring in histidine biosynthesis. The enzyme is also a glutamine amidotransferase, which produces ammonia in a glutaminase active site and channels it through a 30-A internal tunnel to a cyclase active site. Glutaminase activity is impaired in the resting enzyme, and stimulated by substrate binding in the cyclase active site. The signaling mechanism was investigated in the crystal structure of a ternary complex in which the glutaminase active site was inactivated by a glutamine analogue and the unstable cyclase substrate was cryo-trapped in the active site. The orientation of N(1)-(5'-phosphoribulosyl)-formimino-5-aminoimidazole-4-carboxamide ribonucleotide in the cyclase active site implicates one side of the cyclase domain in signaling to the glutaminase domain. This side of the cyclase domain contains the interdomain hinge. Two interdomain hydrogen bonds, which do not exist in more open forms of the enzyme, are proposed as molecular signals. One hydrogen bond connects the cyclase domain to the substrate analogue in the glutaminase active site. The second hydrogen bond connects to a peptide that forms an oxyanion hole for stabilization of transient negative charge during glutamine hydrolysis. Peptide rearrangement induced by a fully closed domain interface is proposed to activate the glutaminase by unblocking the oxyanion hole. This interpretation is consistent with biochemical results [Myers, R. S., et al., (2003) Biochemistry 42, 7013-7022, the accompanying paper in this issue] and with structures of the free enzyme and a binary complex with a second glutamine analogue.

Toward understanding the mechanism of the complex cyclization reaction catalyzed by imidazole glycerolphosphate synthase: crystal structures of a ternary complex and the free enzyme.,Chaudhuri BN, Lange SC, Myers RS, Davisson VJ, Smith JL Biochemistry. 2003 Jun 17;42(23):7003-12. PMID:12795595^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Chaudhuri BN, Lange SC, Myers RS, Davisson VJ, Smith JL. Toward understanding the mechanism of the complex cyclization reaction catalyzed by imidazole glycerolphosphate synthase: crystal structures of a ternary complex and the free enzyme. Biochemistry. 2003 Jun 17;42(23):7003-12. PMID:12795595 doi:http://dx.doi.org/10.1021/bi034320h

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1ox5"

@@ Line 1: / Line 1: @@
 ==TOWARDS UNDERSTANDING THE MECHANISM OF THE COMPLEX CYCLIZATION REACTION CATALYZED BY IMIDAZOLE GLYCEROPHOSPHATE SYNTHASE==
-<StructureSection load='1ox5' size='340' side='right' caption='[[1ox5]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
+<StructureSection load='1ox5' size='340' side='right'caption='[[1ox5]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[1ox5]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_18824 Atcc 18824]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1OX5 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1OX5 FirstGlance]. <br>
+<table><tr><td colspan='2'>[[1ox5]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_18824 Atcc 18824]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1OX5 OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=1OX5 FirstGlance]. <br>
-</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=1PR:PHOSPHORIC+ACID+MONO-[5-({[5-CARBAMOYL-3-(5-PHOSPHONOOXY-5-DEOXY-RIBOFURANOSYL)-+3H-IMIDAZOL-4-YLAMINO]-METHYL}-AMINO)-2,3,4-TRIHYDROXY-PENTYL]+ESTER'>1PR</scene>, <scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</scene></td></tr>
+</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=1PR:PHOSPHORIC+ACID+MONO-[5-({[5-CARBAMOYL-3-(5-PHOSPHONOOXY-5-DEOXY-RIBOFURANOSYL)-+3H-IMIDAZOL-4-YLAMINO]-METHYL}-AMINO)-2,3,4-TRIHYDROXY-PENTYL]+ESTER'>1PR</scene>, <scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</scene></td></tr>
 <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=5CS:2-AMINO-3-(CYSTEIN-S-YL)-ISOXAZOLIDIN-5-YL-ACETIC+ACID'>5CS</scene></td></tr>
-<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1jvn|1jvn]], [[1ox4|1ox4]], [[1ox6|1ox6]]</td></tr>
+<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1jvn|1jvn]], [[1ox4|1ox4]], [[1ox6|1ox6]]</div></td></tr>
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">HIS7 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=4932 ATCC 18824])</td></tr>
-<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1ox5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ox5 OCA], [http://pdbe.org/1ox5 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1ox5 RCSB], [http://www.ebi.ac.uk/pdbsum/1ox5 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1ox5 ProSAT]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=1ox5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1ox5 OCA], [http://pdbe.org/1ox5 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1ox5 RCSB], [http://www.ebi.ac.uk/pdbsum/1ox5 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1ox5 ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 36: / Line 36: @@
 </StructureSection>
 [[Category: Atcc 18824]]
+[[Category: Large Structures]]
 [[Category: Chaudhuri, B N]]
 [[Category: Smith, J L]]

1ox5

From Proteopedia

Revision as of 07:17, 9 December 2020

TOWARDS UNDERSTANDING THE MECHANISM OF THE COMPLEX CYCLIZATION REACTION CATALYZED BY IMIDAZOLE GLYCEROPHOSPHATE SYNTHASE

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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