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[[Image:1s5t.gif|left|200px]]
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{{STRUCTURE_1s5t|  PDB=1s5t  |  SCENE=  }}
'''Crystal Structure Analysis of a mutant of DIHYDRODIPICOLINATE SYNTHASE--residue thr44 to val44'''


==Crystal Structure Analysis of a mutant of DIHYDRODIPICOLINATE SYNTHASE--residue thr44 to val44==
<StructureSection load='1s5t' size='340' side='right'caption='[[1s5t]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1s5t]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1S5T OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1S5T 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]] 2.3&#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=1s5t FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1s5t OCA], [https://pdbe.org/1s5t PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1s5t RCSB], [https://www.ebi.ac.uk/pdbsum/1s5t PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1s5t ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/DAPA_ECOLI DAPA_ECOLI] Catalyzes the condensation of (S)-aspartate-beta-semialdehyde [(S)-ASA] and pyruvate to 4-hydroxy-tetrahydrodipicolinate (HTPA).<ref>PMID:20503968</ref> <ref>PMID:8993314</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/s5/1s5t_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=1s5t ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Dihydrodipicolinate synthase (DHDPS, EC 4.2.1.52) catalyses the branchpoint reaction of lysine biosynthesis in plants and microbes: the condensation of (S)-aspartate-beta-semialdehyde and pyruvate. The crystal structure of wild-type DHDPS has been published to 2.5A, revealing a tetrameric molecule comprised of four identical (beta/alpha)(8)-barrels, each containing one active site. Previous workers have hypothesised that the catalytic mechanism of the enzyme involves a catalytic triad of amino acid residues, Tyr133, Thr44 and Tyr107, which provide a proton shuttle to transport protons from the active site to solvent. We have tested this hypothesis using site-directed mutagenesis to produce three mutant enzymes: DHDPS-Y133F, DHDPS-T44V and DHDPS-Y107F. Each of these mutants has substantially reduced activity, consistent with the catalytic triad hypothesis. We have determined each mutant crystal structure to at least 2.35A resolution and compared the structures to the wild-type enzyme. All mutant enzymes crystallised in the same space group as the wild-type form and only minor differences in structure are observed. These results suggest that the catalytic triad is indeed in operation in wild-type DHDPS.


==Overview==
The crystal structure of three site-directed mutants of Escherichia coli dihydrodipicolinate synthase: further evidence for a catalytic triad.,Dobson RC, Valegard K, Gerrard JA J Mol Biol. 2004 Apr 23;338(2):329-39. PMID:15066435<ref>PMID:15066435</ref>
Dihydrodipicolinate synthase (DHDPS, EC 4.2.1.52) catalyses the branchpoint reaction of lysine biosynthesis in plants and microbes: the condensation of (S)-aspartate-beta-semialdehyde and pyruvate. The crystal structure of wild-type DHDPS has been published to 2.5A, revealing a tetrameric molecule comprised of four identical (beta/alpha)(8)-barrels, each containing one active site. Previous workers have hypothesised that the catalytic mechanism of the enzyme involves a catalytic triad of amino acid residues, Tyr133, Thr44 and Tyr107, which provide a proton shuttle to transport protons from the active site to solvent. We have tested this hypothesis using site-directed mutagenesis to produce three mutant enzymes: DHDPS-Y133F, DHDPS-T44V and DHDPS-Y107F. Each of these mutants has substantially reduced activity, consistent with the catalytic triad hypothesis. We have determined each mutant crystal structure to at least 2.35A resolution and compared the structures to the wild-type enzyme. All mutant enzymes crystallised in the same space group as the wild-type form and only minor differences in structure are observed. These results suggest that the catalytic triad is indeed in operation in wild-type DHDPS.


==About this Structure==
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
1S5T is a [[Single protein]] structure of 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=1S5T OCA].
</div>
<div class="pdbe-citations 1s5t" style="background-color:#fffaf0;"></div>


==Reference==
==See Also==
The crystal structure of three site-directed mutants of Escherichia coli dihydrodipicolinate synthase: further evidence for a catalytic triad., Dobson RC, Valegard K, Gerrard JA, J Mol Biol. 2004 Apr 23;338(2):329-39. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15066435 15066435]
*[[Dihydrodipicolinate synthase|Dihydrodipicolinate synthase]]
[[Category: Dihydrodipicolinate synthase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Dobson, R C.J.]]
[[Category: Dobson RCJ]]
[[Category: Gerrard, J A.]]
[[Category: Gerrard JA]]
[[Category: Valegard, K.]]
[[Category: Valegard K]]
[[Category: Dihydrodipicolinate]]
[[Category: Synthase]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 08:20:13 2008''

Latest revision as of 07:25, 25 October 2023

Crystal Structure Analysis of a mutant of DIHYDRODIPICOLINATE SYNTHASE--residue thr44 to val44

1s5t, resolution 2.30Å

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