View source for 1xxx


==Crystal structure of Dihydrodipicolinate Synthase (DapA, Rv2753c) from Mycobacterium tuberculosis==
<StructureSection load='1xxx' size='340' side='right'caption='[[1xxx]], [[Resolution|resolution]] 2.28&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1xxx]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Mycobacterium_tuberculosis Mycobacterium tuberculosis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1XXX OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1XXX 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]] 2.28&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=DTT:2,3-DIHYDROXY-1,4-DITHIOBUTANE'>DTT</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene></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=1xxx FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1xxx OCA], [https://pdbe.org/1xxx PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1xxx RCSB], [https://www.ebi.ac.uk/pdbsum/1xxx PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1xxx ProSAT], [https://www.topsan.org/Proteins/XMTB/1xxx TOPSAN]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DAPA_MYCTU DAPA_MYCTU] Catalyzes the condensation of (S)-aspartate-beta-semialdehyde [(S)-ASA] and pyruvate to 4-hydroxy-tetrahydrodipicolinate (HTPA) (Probable).<ref>PMID:18062777</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/xx/1xxx_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1xxx ConSurf].
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== Publication Abstract from PubMed ==
The three-dimensional structure of the enzyme dihydrodipicolinate synthase (KEGG entry Rv2753c, EC 4.2.1.52) from Mycobacterium tuberculosis (Mtb-DHDPS) was determined and refined at 2.28 A (1 A=0.1 nm) resolution. The asymmetric unit of the crystal contains two tetramers, each of which we propose to be the functional enzyme unit. This is supported by analytical ultracentrifugation studies, which show the enzyme to be tetrameric in solution. The structure of each subunit consists of an N-terminal (beta/alpha)(8)-barrel followed by a C-terminal alpha-helical domain. The active site comprises residues from two adjacent subunits, across an interface, and is located at the C-terminal side of the (beta/alpha)(8)-barrel domain. A comparison with the other known DHDPS structures shows that the overall architecture of the active site is largely conserved, albeit the proton relay motif comprising Tyr(143), Thr(54) and Tyr(117) appears to be disrupted. The kinetic parameters of the enzyme are reported: K(M)(ASA)=0.43+/-0.02 mM, K(M)(pyruvate)=0.17+/-0.01 mM and V(max)=4.42+/-0.08 micromol x s(-1) x mg(-1). Interestingly, the V(max) of Mtb-DHDPS is 6-fold higher than the corresponding value for Escherichia coli DHDPS, and the enzyme is insensitive to feedback inhibition by (S)-lysine. This can be explained by the three-dimensional structure, which shows that the (S)-lysine-binding site is not conserved in Mtb-DHDPS, when compared with DHDPS enzymes that are known to be inhibited by (S)-lysine. A selection of metabolites from the aspartate family of amino acids do not inhibit this enzyme. A comprehensive understanding of the structure and function of this important enzyme from the (S)-lysine biosynthesis pathway may provide the key for the design of new antibiotics to combat tuberculosis.

Crystal structure and kinetic study of dihydrodipicolinate synthase from Mycobacterium tuberculosis.,Kefala G, Evans GL, Griffin MD, Devenish SR, Pearce FG, Perugini MA, Gerrard JA, Weiss MS, Dobson RC Biochem J. 2008 Apr 15;411(2):351-60. PMID:18062777<ref>PMID:18062777</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Dihydrodipicolinate synthase|Dihydrodipicolinate synthase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Mycobacterium tuberculosis]]
[[Category: Janowski R]]
[[Category: Kefala G]]
[[Category: Panjikar S]]
[[Category: Weiss MS]]