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[[Image:2aal.gif|left|200px]]<br /><applet load="2aal" size="350" color="white" frame="true" align="right" spinBox="true"
caption="2aal, resolution 1.65&Aring;" />
'''Crystal Structures of the Wild-type, Mutant-P1A and Inactivated Malonate Semialdehyde Decarboxylase: A Structural Basis for the Decarboxylase and Hydratase Activities'''<br />


==Overview==
==Crystal Structures of the Wild-type, Mutant-P1A and Inactivated Malonate Semialdehyde Decarboxylase: A Structural Basis for the Decarboxylase and Hydratase Activities==
Malonate semialdehyde decarboxylase (MSAD) from Pseudomonas pavonaceae 170 is a tautomerase superfamily member that converts malonate semialdehyde to acetaldehyde by a mechanism utilizing Pro-1 and Arg-75. Pro-1 and Arg-75 have also been implicated in the hydratase activity of MSAD in which 2-oxo-3-pentynoate is processed to acetopyruvate. Crystal structures of MSAD (1.8 A resolution), the P1A mutant of MSAD (2.7 A resolution), and MSAD inactivated by 3-chloropropiolate (1.6 A resolution), a mechanism-based inhibitor activated by the hydratase activity of MSAD, have been determined. A comparison of the P1A-MSAD and MSAD structures reveals little geometric alteration, indicating that Pro-1 plays an important catalytic role but not a critical structural role. The structures of wild-type MSAD and MSAD covalently modified at Pro-1 by 3-oxopropanoate, the adduct resulting from the incubation of MSAD and 3-chloropropiolate, implicate Asp-37 as the residue that activates a water molecule for attack at C-3 of 3-chloropropiolate to initiate a Michael addition of water. The interactions of Arg-73 and Arg-75 with the C-1 carboxylate group of the adduct suggest these residues polarize the alpha,beta-unsaturated acid and facilitate the addition of water. On the basis of these structures, a mechanism for the inactivation of MSAD by 3-chloropropiolate can be formulated along with mechanisms for the decarboxylase and hydratase activities. The results also provide additional evidence supporting the hypothesis that MSAD and trans-3-chloroacrylic acid dehalogenase, a tautomerase superfamily member preceding MSAD in the trans-1,3-dichloropropene degradation pathway, diverged from a common ancestor but retained the key elements for the conjugate addition of water.
<StructureSection load='2aal' size='340' side='right'caption='[[2aal]], [[Resolution|resolution]] 1.65&Aring;' scene=''>
 
== Structural highlights ==
==About this Structure==
<table><tr><td colspan='2'>[[2aal]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Pseudomonas_pavonaceae Pseudomonas pavonaceae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2AAL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2AAL FirstGlance]. <br>
2AAL is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Pseudomonas_pavonaceae Pseudomonas pavonaceae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2AAL OCA].  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.65&#8491;</td></tr>
 
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=MLI:MALONATE+ION'>MLI</scene></td></tr>
==Reference==
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=2aal FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2aal OCA], [https://pdbe.org/2aal PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2aal RCSB], [https://www.ebi.ac.uk/pdbsum/2aal PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2aal ProSAT]</span></td></tr>
Crystal structures of the wild-type, P1A mutant, and inactivated malonate semialdehyde decarboxylase: a structural basis for the decarboxylase and hydratase activities., Almrud JJ, Poelarends GJ, Johnson WH Jr, Serrano H, Hackert ML, Whitman CP, Biochemistry. 2005 Nov 15;44(45):14818-27. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=16274229 16274229]
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q9EV83_PSEPV Q9EV83_PSEPV]
== 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/aa/2aal_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=2aal ConSurf].
<div style="clear:both"></div>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Pseudomonas pavonaceae]]
[[Category: Pseudomonas pavonaceae]]
[[Category: Single protein]]
[[Category: Almrud JJ]]
[[Category: Almrud, J J.]]
[[Category: Hackert ML]]
[[Category: Hackert, M L.]]
[[Category: Johnson Jr WH]]
[[Category: Jr., W H.Johnson.]]
[[Category: Poelarends GJ]]
[[Category: Poelarends, G J.]]
[[Category: Serrano H]]
[[Category: Serrano, H.]]
[[Category: Whitman CP]]
[[Category: Whitman, C P.]]
[[Category: tautomerase superfamily; beta-alpha-beta; homotrimeric]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 16:25:30 2008''

Latest revision as of 13:15, 27 March 2024

Crystal Structures of the Wild-type, Mutant-P1A and Inactivated Malonate Semialdehyde Decarboxylase: A Structural Basis for the Decarboxylase and Hydratase ActivitiesCrystal Structures of the Wild-type, Mutant-P1A and Inactivated Malonate Semialdehyde Decarboxylase: A Structural Basis for the Decarboxylase and Hydratase Activities

Structural highlights

2aal is a 6 chain structure with sequence from Pseudomonas pavonaceae. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 1.65Å
Ligands:
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

Q9EV83_PSEPV

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

2aal, resolution 1.65Å

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