2v81

From Proteopedia

(Difference between revisions)
Jump to: navigation, search
Line 1: Line 1:
-
[[Image:2v81.png|left|200px]]
+
==NATIVE KDPGAL STRUCTURE==
 +
<StructureSection load='2v81' size='340' side='right' caption='[[2v81]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
 +
== Structural highlights ==
 +
<table><tr><td colspan='2'>[[2v81]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2V81 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2V81 FirstGlance]. <br>
 +
</td></tr><tr><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=MSE:SELENOMETHIONINE'>MSE</scene></td></tr>
 +
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[2j6n|2j6n]], [[2j6q|2j6q]], [[2v82|2v82]]</td></tr>
 +
<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/2-dehydro-3-deoxy-6-phosphogalactonate_aldolase 2-dehydro-3-deoxy-6-phosphogalactonate aldolase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=4.1.2.21 4.1.2.21] </span></td></tr>
 +
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=2v81 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2v81 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2v81 RCSB], [http://www.ebi.ac.uk/pdbsum/2v81 PDBsum]</span></td></tr>
 +
<table>
 +
== Evolutionary Conservation ==
 +
[[Image:Consurf_key_small.gif|200px|right]]
 +
Check<jmol>
 +
<jmolCheckbox>
 +
<scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/v8/2v81_consurf.spt"</scriptWhenChecked>
 +
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
 +
<text>to colour the structure by Evolutionary Conservation</text>
 +
</jmolCheckbox>
 +
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf].
 +
<div style="clear:both"></div>
 +
<div style="background-color:#fffaf0;">
 +
== Publication Abstract from PubMed ==
 +
2-Keto-3-deoxy-6-phosphogluconate (KDPG) and 2-keto-3-deoxy-6-phosphogalactonate (KDPGal) aldolases catalyze an identical reaction differing in substrate specificity in only the configuration of a single stereocenter. However, the proteins show little sequence homology at the amino acid level. Here we investigate the determinants of substrate selectivity of these enzymes. The Escherichia coli KDPGal aldolase gene, cloned into a T7 expression vector and overexpressed in E. coli, catalyzes retro-aldol cleavage of the natural substrate, KDPGal, with values of k(cat)/K(M) and k(cat) of 1.9x10(4)M(-1)s(-1) and 4s(-1), respectively. In the synthetic direction, KDPGal aldolase efficiently catalyzes an aldol addition using a limited number of aldehyde substrates, including d-glyceraldehyde-3-phosphate (natural substrate), d-glyceraldehyde, glycolaldehyde, and 2-pyridinecarboxaldehyde. A preparative scale reaction between 2-pyridinecarboxaldehyde and pyruvate catalyzed by KDPGal aldolase produced the aldol adduct of the R stereochemistry in &gt;99.7% ee, a result complementary to that observed using the related KDPG aldolase. The native crystal structure has been solved to a resolution of 2.4A and displays the same (alpha/beta)(8) topology, as KDPG aldolase. We have also determined a 2.1A structure of a Schiff base complex between the enzyme and its substrate. This model predicts that a single amino acid change, T161 in KDPG aldolase to V154 in KDPGal aldolase, plays an important role in determining the stereochemical course of enzyme catalysis and this prediction was borne out by site-directed mutagenesis studies. However, additional changes in the enzyme sequence are required to prepare an enzyme with both high catalytic efficiency and altered stereochemistry.
-
{{STRUCTURE_2v81| PDB=2v81 | SCENE= }}
+
Characterization and crystal structure of Escherichia coli KDPGal aldolase.,Walters MJ, Srikannathasan V, McEwan AR, Naismith JH, Fierke CA, Toone EJ Bioorg Med Chem. 2008 Jan 15;16(2):710-20. Epub 2007 Oct 18. PMID:17981470<ref>PMID:17981470</ref>
-
===NATIVE KDPGAL STRUCTURE===
+
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
-
 
+
</div>
-
{{ABSTRACT_PUBMED_17981470}}
+
-
 
+
-
==About this Structure==
+
-
[[2v81]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2V81 OCA].
+
==See Also==
==See Also==
*[[Aldolase|Aldolase]]
*[[Aldolase|Aldolase]]
-
 
+
== References ==
-
==Reference==
+
<references/>
-
<ref group="xtra">PMID:017981470</ref><references group="xtra"/>
+
__TOC__
 +
</StructureSection>
[[Category: 2-dehydro-3-deoxy-6-phosphogalactonate aldolase]]
[[Category: 2-dehydro-3-deoxy-6-phosphogalactonate aldolase]]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]

Revision as of 07:04, 29 September 2014

NATIVE KDPGAL STRUCTURE

2v81, resolution 2.40Å

Drag the structure with the mouse to rotate

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2v81"
Views
Personal tools
Navigation
Toolbox