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[[Image:1szu.gif|left|200px]]


{{Structure
==The structure of gamma-aminobutyrate aminotransferase mutant: V241A==
|PDB= 1szu |SIZE=350|CAPTION= <scene name='initialview01'>1szu</scene>, resolution 2.52&Aring;
<StructureSection load='1szu' size='340' side='right'caption='[[1szu]], [[Resolution|resolution]] 2.52&Aring;' scene=''>
|SITE=
== Structural highlights ==
|LIGAND= <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=PLP:PYRIDOXAL-5&#39;-PHOSPHATE'>PLP</scene> and <scene name='pdbligand=PMP:4&#39;-DEOXY-4&#39;-AMINOPYRIDOXAL-5&#39;-PHOSPHATE'>PMP</scene>
<table><tr><td colspan='2'>[[1szu]] is a 4 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=1SZU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1SZU FirstGlance]. <br>
|ACTIVITY= [http://en.wikipedia.org/wiki/4-aminobutyrate_transaminase 4-aminobutyrate transaminase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.6.1.19 2.6.1.19]  
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.52&#8491;</td></tr>
|GENE= GABT, B2662 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=562 Escherichia coli])
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=PLP:PYRIDOXAL-5-PHOSPHATE'>PLP</scene>, <scene name='pdbligand=PMP:4-DEOXY-4-AMINOPYRIDOXAL-5-PHOSPHATE'>PMP</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=1szu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1szu OCA], [https://pdbe.org/1szu PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1szu RCSB], [https://www.ebi.ac.uk/pdbsum/1szu PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1szu ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/GABT_ECOLI GABT_ECOLI] Catalyzes the transfer of the amino group from gamma-aminobutyrate (GABA) to alpha-ketoglutarate (KG) to yield succinic semialdehyde (SSA).<ref>PMID:20639325</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/sz/1szu_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=1szu ConSurf].
<div style="clear:both"></div>


'''The structure of gamma-aminobutyrate aminotransferase mutant: V241A'''
==See Also==
 
*[[Aminotransferase 3D structures|Aminotransferase 3D structures]]
 
== References ==
==Overview==
<references/>
The E. coli isozyme of gamma-aminobutyrate aminotransferase (GABA-AT) is a tetrameric pyridoxal phosphate-dependent enzyme that catalyzes transamination between primary amines and alpha-keto acids. The roles of the active site residues V241, E211, and I50 in the GABA-AT mechanism have been probed by site-directed mutagenesis. The beta-branched side chain of V241 facilitates formation of external aldimine intermediates with primary amine substrates, while E211 provides charge compensation of R398 selectively in the primary amine half-reaction and I50 forms a hydrophobic lid at the top of the substrate binding site. The structures of the I50Q, V241A, and E211S mutants were solved by X-ray crystallography to resolutions of 2.1, 2.5, and 2.52 A, respectively. The structure of GABA-AT is similar in overall fold and active site structure to that of dialkylglycine decarboxylase, which catalyzes both transamination and decarboxylation half-reactions in its normal catalytic cycle. Therefore, an attempt was made to convert GABA-AT into a decarboxylation-dependent aminotransferase similar to dialkylglycine decarboxylase by systematic mutation of E. coli GABA-AT active site residues. Two of the twelve mutants presented, E211S/I50G/C77K and E211S/I50H/V80D, have approximately 10-fold higher decarboxylation activities than the wild-type enzyme, and the E211S/I50H/V80D has formally changed the reaction specificity to that of a decarboxylase.
__TOC__
 
</StructureSection>
==About this Structure==
1SZU 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=1SZU OCA].
 
==Reference==
Kinetic and crystallographic analysis of active site mutants of Escherichia coli gamma-aminobutyrate aminotransferase., Liu W, Peterson PE, Langston JA, Jin X, Zhou X, Fisher AJ, Toney MD, Biochemistry. 2005 Mar 1;44(8):2982-92. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/15723541 15723541]
[[Category: 4-aminobutyrate transaminase]]
[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Fisher, A J.]]
[[Category: Fisher AJ]]
[[Category: Jin, X.]]
[[Category: Jin X]]
[[Category: Langston, J A.]]
[[Category: Langston JA]]
[[Category: Liu, W.]]
[[Category: Liu W]]
[[Category: Peterson, P E.]]
[[Category: Peterson PE]]
[[Category: Toney, M D.]]
[[Category: Toney MD]]
[[Category: Zhou, X.]]
[[Category: Zhou X]]
[[Category: EDO]]
[[Category: PLP]]
[[Category: PMP]]
[[Category: SO4]]
[[Category: gaba-at]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Mar 23 13:40:30 2008''

Latest revision as of 08:36, 1 May 2024

The structure of gamma-aminobutyrate aminotransferase mutant: V241A

1szu, resolution 2.52Å

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