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2acq

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Revision as of 07:22, 9 May 2018

AN ANION BINDING SITE IN HUMAN ALDOSE REDUCTASE: MECHANISTIC IMPLICATIONS FOR THE BINDING OF CITRATE, CACODYLATE, AND GLUCOSE-6-PHOSPHATE

Structural highlights

2acq is a 1 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Activity:	Aldehyde reductase, with EC number 1.1.1.21
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[ALDR_HUMAN] Catalyzes the NADPH-dependent reduction of a wide variety of carbonyl-containing compounds to their corresponding alcohols with a broad range of catalytic efficiencies.

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

Aldose reductase is a NADPH-dependent aldo-keto reductase involved in the pathogenesis of some diabetic and galactosemic complications. The published crystal structure of human aldose reductase [Wilson et al. (1992) Science 257, 81-84] contains a hitherto unexplained electron density positioned within the active site pocket facing the nicotinamide ring of the NADPH and other key active site residues (Tyr48, His110, and Cys298). In this paper we identify the electron density as citrate, which is present in the crystallization buffer (pH 5.0), and provide confirmatory evidence by both kinetic and crystallographic experiments. Citrate is an uncompetitive inhibitor in the forward reaction with respect to aldehyde (reduction of aldehyde), while it is a competitive inhibitor with respect to alcohol in the backward reaction (oxidation of alcohol), indicating that it interacts with the enzyme-NADP(+)-product complex. Citrate can be replaced in the crystalline enzyme complex by cacodylate or glucose 6-phosphate; the structure of each of these complexes shows the specific molecule bound in the active site. All of the structures have been determined to a nominal resolution of 1.76 A and refined to R-factors below 18%. While cacodylate can be bound within the active site under the crystallization conditions, it does not inhibit the wild-type enzyme in solution. Glucose 6-phosphate, however, is a substrate for aldose reductase. The similar location of the negative charges of citrate, cacodylate, and glucose 6-phosphate within the active site suggests an anion-binding site delineated by the C4N of nicotinamide, the OH of Tyr48, and the N epsilon of His110. The location of citrate binding in the active site leads to a plausible catalytic mechanism for aldose reductase.

An anion binding site in human aldose reductase: mechanistic implications for the binding of citrate, cacodylate, and glucose 6-phosphate.,Harrison DH, Bohren KM, Ringe D, Petsko GA, Gabbay KH Biochemistry. 1994 Mar 1;33(8):2011-20. PMID:8117658^[1]

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

References

↑ Harrison DH, Bohren KM, Ringe D, Petsko GA, Gabbay KH. An anion binding site in human aldose reductase: mechanistic implications for the binding of citrate, cacodylate, and glucose 6-phosphate. Biochemistry. 1994 Mar 1;33(8):2011-20. PMID:8117658

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2acq"

@@ Line 1: / Line 1: @@
 ==AN ANION BINDING SITE IN HUMAN ALDOSE REDUCTASE: MECHANISTIC IMPLICATIONS FOR THE BINDING OF CITRATE, CACODYLATE, AND GLUCOSE-6-PHOSPHATE==
 <StructureSection load='2acq' size='340' side='right' caption='[[2acq]], [[Resolution|resolution]] 1.76&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=G6P:ALPHA-D-GLUCOSE-6-PHOSPHATE'>G6P</scene>, <scene name='pdbligand=NAP:NADP+NICOTINAMIDE-ADENINE-DINUCLEOTIDE+PHOSPHATE'>NAP</scene></td></tr>
 <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Aldehyde_reductase Aldehyde reductase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=1.1.1.21 1.1.1.21] </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=2acq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2acq OCA], [http://pdbe.org/2acq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2acq RCSB], [http://www.ebi.ac.uk/pdbsum/2acq 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=2acq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2acq OCA], [http://pdbe.org/2acq PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2acq RCSB], [http://www.ebi.ac.uk/pdbsum/2acq PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2acq 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/ac/2acq_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ac/2acq_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

2acq

From Proteopedia

Revision as of 07:22, 9 May 2018

AN ANION BINDING SITE IN HUMAN ALDOSE REDUCTASE: MECHANISTIC IMPLICATIONS FOR THE BINDING OF CITRATE, CACODYLATE, AND GLUCOSE-6-PHOSPHATE

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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