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1i1q

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Revision as of 09:23, 10 January 2018

STRUCTURE OF THE COOPERATIVE ALLOSTERIC ANTHRANILATE SYNTHASE FROM SALMONELLA TYPHIMURIUM

Structural highlights

1i1q is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:
Activity:	Anthranilate synthase, with EC number 4.1.3.27
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[TRPE_SALTY] Part of a heterotetrameric complex that catalyzes the two-step biosynthesis of anthranilate, an intermediate in the biosynthesis of L-tryptophan. In the first step, the glutamine-binding beta subunit (TrpG) of anthranilate synthase (AS) provides the glutamine amidotransferase activity which generates ammonia as a substrate that, along with chorismate, is used in the second step, catalyzed by the large alpha subunit of AS (TrpE) to produce anthranilate. In the absence of TrpG, TrpE can synthesize anthranilate directly from chorismate and high concentrations of ammonia.^[1] [TRPGD_SALTY] Part of a heterotetrameric complex that catalyzes the two-step biosynthesis of anthranilate, an intermediate in the biosynthesis of L-tryptophan. In the first step, the glutamine-binding beta subunit (TrpG) of anthranilate synthase (AS) provides the glutamine amidotransferase activity which generates ammonia as a substrate that, along with chorismate, is used in the second step, catalyzed by the large alpha subunit of AS (TrpE) to produce anthranilate. In the absence of TrpG, TrpE can synthesize anthranilate directly from chorismate and high concentrations of ammonia. In addition to synthesizing anthranilate, it also catalyzes the second step of the pathway, the transfer of the phosphoribosyl group of 5-phosphorylribose-1-pyrophosphate (PRPP) to anthranilate.^[2]

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

We have determined the X-ray crystal structure of the cooperative anthranilate synthase heterotetramer from Salmonella typhimurium at 1.9 A resolution with the allosteric inhibitor l-tryptophan bound to a regulatory site in the TrpE subunit. Tryptophan binding orders a loop that in turn stabilizes the inactive T state of the enzyme by restricting closure of the active site cleft. Comparison with the structure of the unliganded, noncooperative anthranilate synthase heterotetramer from Sulfolobus solfataricus shows that the two homologs have completely different quarternary structures, even though their functional dimer pairs are structurally similar, consistent with differences in the cooperative behavior of the enzymes. The structural model rationalizes mutational and biochemical studies of the enzyme and establishes the structural differences between cooperative and noncooperative anthranilate synthase homologs.

Structure of the cooperative allosteric anthranilate synthase from Salmonella typhimurium.,Morollo AA, Eck MJ Nat Struct Biol. 2001 Mar;8(3):243-7. PMID:11224570^[3]

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

References

↑ Grieshaber M, Bauerle R. Monomeric and dimeric forms of component II of the anthranilate synthetase--anthranilate 5-phosphoribosylpyrophosphate phosphoribosyltransferase complex of Salmonella typhimurium. Implications concerning the mode of assembly of the complex. Biochemistry. 1974 Jan 15;13(2):373-83. PMID:4358945
↑ Nagano H, Zalkin H. Some physicochemical properties of anthranilate synthetase component I from Salmonella typhimurium. J Biol Chem. 1970 Jun;245(12):3097-103. PMID:4914739
↑ Morollo AA, Eck MJ. Structure of the cooperative allosteric anthranilate synthase from Salmonella typhimurium. Nat Struct Biol. 2001 Mar;8(3):243-7. PMID:11224570 doi:10.1038/84988

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/1i1q"

Categories: Anthranilate synthase | Eck, M J | Morollo, A A | Lyase | Tryptophan biosynthesis

@@ Line 1: / Line 1: @@
 ==STRUCTURE OF THE COOPERATIVE ALLOSTERIC ANTHRANILATE SYNTHASE FROM SALMONELLA TYPHIMURIUM==
 <StructureSection load='1i1q' size='340' side='right' caption='[[1i1q]], [[Resolution|resolution]] 1.90&Aring;' scene=''>
@@ Line 5: / Line 6: @@
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=TRP:TRYPTOPHAN'>TRP</scene></td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Anthranilate_synthase Anthranilate synthase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.3.27 4.1.3.27] </span></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=1i1q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1i1q OCA], [http://pdbe.org/1i1q PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1i1q RCSB], [http://www.ebi.ac.uk/pdbsum/1i1q PDBsum]</span></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=1i1q FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1i1q OCA], [http://pdbe.org/1i1q PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1i1q RCSB], [http://www.ebi.ac.uk/pdbsum/1i1q PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1i1q ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 13: / Line 14: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/i1/1i1q_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/i1/1i1q_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

1i1q

From Proteopedia

Revision as of 09:23, 10 January 2018

STRUCTURE OF THE COOPERATIVE ALLOSTERIC ANTHRANILATE SYNTHASE FROM SALMONELLA TYPHIMURIUM

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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