View source for 2qz9


==crystal structure of aspartate semialdehyde dehydrogenase II from vibrio cholerae==
<StructureSection load='2qz9' size='340' side='right'caption='[[2qz9]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2qz9]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Vibrio_cholerae Vibrio cholerae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2QZ9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2QZ9 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2&#8491;</td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2qz9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2qz9 OCA], [https://pdbe.org/2qz9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2qz9 RCSB], [https://www.ebi.ac.uk/pdbsum/2qz9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2qz9 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DHAS2_VIBCH DHAS2_VIBCH] Catalyzes the NADPH-dependent formation of L-aspartate-semialdehyde (L-ASA) by the reductive dephosphorylation of L-aspartyl-4-phosphate.<ref>PMID:12071715</ref> 
== 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/qz/2qz9_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/main_output.php?pdb_ID=2qz9 ConSurf].
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== Publication Abstract from PubMed ==
Aspartate-beta-semialdehyde dehydrogenase (ASADH) is an essential enzyme that is found in bacteria, fungi and plants but not in humans. ASADH produces the first branch-point metabolite in the biosynthetic pathways that lead to the production of lysine, threonine, methionine and isoleucine as well as the cell-wall precursor diaminopimelate. As a consequence, ASADH appears to be an excellent target for the development of novel antibiotics, especially for Gram-negative bacteria that require diaminopimelate for cell-wall biosynthesis. In contrast to the Gram-negative ASADHs, which readily formed well diffracting crystals, the second isoform of aspartate-beta-semialdehyde dehydrogenase from Vibrio cholerae (vcASADH2) was less well behaved in initial crystallization trials. In order to obtain good-quality single crystals of vcASADH2, a buffer-optimization protocol was used in which the initial purification buffer was exchanged into a new condition derived from a pre-crystalline hit. The unliganded structure of vcASADH2 has been determined to 2.2 A resolution to provide additional insight into the structural and functional evolution of the ASADH enzyme family. The overall fold and domain organization of this new structure is similar to the Gram-negative, Gram-positive and archeal ASADH structures determined previously, despite having less than 50% sequence identity to any of these family members. The substrate-complex structure reveals that the binding of L-aspartate-beta-semialdehyde (ASA) to vcASADH2 is accommodated by structural changes in the amino-acid binding site and in the helical subdomain that is involved in the dimer interface. Structural alignments show that this second isoform from Gram-negative V. cholerae most closely resembles the ASADH from a Gram-positive organism and is likely to bind the coenzyme in a different conformation to that observed in the other V. cholerae isoform.

The structure of a redundant enzyme: a second isoform of aspartate beta-semialdehyde dehydrogenase in Vibrio cholerae.,Viola RE, Liu X, Ohren JF, Faehnle CR Acta Crystallogr D Biol Crystallogr. 2008 Mar;64(Pt 3):321-30. Epub 2008, Feb 20. PMID:18323627<ref>PMID:18323627</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2qz9" style="background-color:#fffaf0;"></div>

==See Also==
*[[Aspartate-semialdehyde dehydrogenase 3D structures|Aspartate-semialdehyde dehydrogenase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Vibrio cholerae]]
[[Category: Faehnle CR]]
[[Category: Liu X]]
[[Category: Ohren JF]]
[[Category: Viola RE]]