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1f91

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(New page: 200px<br /><applet load="1f91" size="450" color="white" frame="true" align="right" spinBox="true" caption="1f91, resolution 2.4&Aring;" /> '''BETA-KETOACYL-[ACYL-C...)
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[[Image:1f91.gif|left|200px]]<br /><applet load="1f91" size="450" color="white" frame="true" align="right" spinBox="true"
 
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caption="1f91, resolution 2.4&Aring;" />
 
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'''BETA-KETOACYL-[ACYL-CARRIER-PROTEIN] SYNTHASE I IN COMPLEX WITH C10 FATTY ACID SUBSTRATE'''<br />
 
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==Overview==
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==BETA-KETOACYL-[ACYL-CARRIER-PROTEIN] SYNTHASE I IN COMPLEX WITH C10 FATTY ACID SUBSTRATE==
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BACKGROUND: beta-ketoacyl-acyl carrier protein synthase (KAS) I is vital, for the construction of the unsaturated fatty acid carbon skeletons, characterizing E. coli membrane lipids. The new carbon-carbon bonds are, created by KAS I in a Claisen condensation performed in a three-step, enzymatic reaction. KAS I belongs to the thiolase fold enzymes, of which, structures are known for five other enzymes. RESULTS: Structures of the, catalytic Cys-Ser KAS I mutant with covalently bound C10 and C12 acyl, substrates have been determined to 2.40 and 1.85 A resolution, respectively. The KAS I dimer is not changed by the formation of the, complexes but reveals an asymmetric binding of the two substrates bound to, the dimer. A detailed model is proposed for the catalysis of KAS I. Of the, two histidines required for decarboxylation, one donates a hydrogen bond, to the malonyl thioester oxo group, and the other abstracts a proton from, the leaving group. CONCLUSIONS: The same mechanism is proposed for KAS II, which also has a Cys-His-His active site triad. Comparison to the active, site architectures of other thiolase fold enzymes carrying out a, decarboxylation step suggests that chalcone synthase and KAS III with, Cys-His-Asn triads use another mechanism in which both the histidine and, the asparagine interact with the thioester oxo group. The acyl binding, pockets of KAS I and KAS II are so similar that they alone cannot provide, the basis for their differences in substrate specificity.
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<StructureSection load='1f91' size='340' side='right'caption='[[1f91]], [[Resolution|resolution]] 2.40&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[1f91]] 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=1F91 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1F91 FirstGlance]. <br>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.4&#8491;</td></tr>
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DKA:DECANOIC+ACID'>DKA</scene>, <scene name='pdbligand=OH:HYDROXIDE+ION'>OH</scene></td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1f91 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1f91 OCA], [https://pdbe.org/1f91 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1f91 RCSB], [https://www.ebi.ac.uk/pdbsum/1f91 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1f91 ProSAT]</span></td></tr>
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</table>
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== Function ==
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[https://www.uniprot.org/uniprot/FABB_ECOLI FABB_ECOLI] Catalyzes the condensation reaction of fatty acid synthesis by the addition to an acyl acceptor of two carbons from malonyl-ACP. Specific for elongation from C-10 to unsaturated C-16 and C-18 fatty acids.
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== Evolutionary Conservation ==
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[[Image:Consurf_key_small.gif|200px|right]]
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Check<jmol>
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<jmolCheckbox>
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/f9/1f91_consurf.spt"</scriptWhenChecked>
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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</jmolCheckbox>
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</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=1f91 ConSurf].
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<div style="clear:both"></div>
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==About this Structure==
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==See Also==
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1F91 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of sequence from [http://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] with OH and DKA as [http://en.wikipedia.org/wiki/ligands ligands]. Active as [http://en.wikipedia.org/wiki/Beta-ketoacyl-acyl-carrier-protein_synthase_I Beta-ketoacyl-acyl-carrier-protein synthase I], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=2.3.1.41 2.3.1.41] Full crystallographic information is available from [http://ispc.weizmann.ac.il/oca-bin/ocashort?id=1F91 OCA].
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*[[Acyl carrier protein synthase 3D structures|Acyl carrier protein synthase 3D structures]]
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__TOC__
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==Reference==
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</StructureSection>
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Structures of beta-ketoacyl-acyl carrier protein synthase I complexed with fatty acids elucidate its catalytic machinery., Olsen JG, Kadziola A, von Wettstein-Knowles P, Siggaard-Andersen M, Larsen S, Structure. 2001 Mar 7;9(3):233-43. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=11286890 11286890]
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[[Category: Beta-ketoacyl-acyl-carrier-protein synthase I]]
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[[Category: Escherichia coli]]
[[Category: Escherichia coli]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Kadziola, A.]]
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[[Category: Kadziola A]]
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[[Category: Larsen, S.]]
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[[Category: Larsen S]]
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[[Category: Olsen, J.G.]]
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[[Category: Olsen JG]]
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[[Category: Siggaard-Andersen, M.]]
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[[Category: Siggaard-Andersen M]]
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[[Category: Wettstein-Knowles, P.V.]]
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[[Category: Wettstein-Knowles PV]]
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[[Category: DKA]]
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[[Category: OH]]
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[[Category: dimer]]
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[[Category: thiolase fold family]]
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''Page seeded by [http://ispc.weizmann.ac.il/oca OCA ] on Tue Nov 20 14:43:15 2007''
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Current revision

BETA-KETOACYL-[ACYL-CARRIER-PROTEIN] SYNTHASE I IN COMPLEX WITH C10 FATTY ACID SUBSTRATE

PDB ID 1f91

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