View source for 1e5m


==Beta ketoacyl acyl carrier protein synthase II (KASII) from Synechocystis sp.==
<StructureSection load='1e5m' size='340' side='right'caption='[[1e5m]], [[Resolution|resolution]] 1.54&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1e5m]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Synechocystis_sp._PCC_6803 Synechocystis sp. PCC 6803]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1E5M OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1E5M 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]] 1.54&#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=1e5m FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1e5m OCA], [https://pdbe.org/1e5m PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1e5m RCSB], [https://www.ebi.ac.uk/pdbsum/1e5m PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1e5m ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/FABF_SYNY3 FABF_SYNY3] Catalyzes the condensation reaction of fatty acid synthesis by the addition to an acyl acceptor of two carbons from malonyl-ACP. Has a preference for short chain acid substrates.
== 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/e5/1e5m_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=1e5m ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Condensing enzymes, catalyzing the formation of carbon-carbon bonds in several biosynthetic pathways, have lately been recognized as potential drug targets against cancer and tuberculosis, as crucial for combinatorial biosynthesis of antibiotics and related compounds, and as determinants of plant oil composition. beta-Ketoacyl-ACP synthases (KAS) are the condensing enzymes present in the fatty acid biosynthesis pathway and are able to elongate an acyl chain bound to either co-enzyme A (CoA) or acyl carrier protein (ACP) with a two-carbon unit derived from malonyl-ACP. Several isoforms of KAS with different substrate specificity are present in most species. We have determined the crystal structure of KAS II from Synechocystis sp. PCC 6803 to 1.54 A resolution giving a detailed description of the active site geometry. In order to analyze the structure-function relationships in this class of enzymes in more detail, we have compared all presently known three-dimensional structures of condensing enzymes from different pathways. The comparison reveals that these enzymes can be divided into three structural and functional classes. This classification can be related to variations in the catalytic mechanism and the set of residues in the catalytic site, e.g. due to differences in the nature of the second substrate providing the two-carbon elongation unit. The variation in the acyl-carrier (ACP or CoA) specificity might also be connected to this classification and residues involved in ACP binding in structure class 2 can be suggested based on the comparison. Finally, the two subunits in the dimer contribute differently to formation of the substrate binding-pocket in the three structural classes.

The crystal structure of beta-ketoacyl-acyl carrier protein synthase II from Synechocystis sp. at 1.54 A resolution and its relationship to other condensing enzymes.,Moche M, Dehesh K, Edwards P, Lindqvist Y J Mol Biol. 2001 Jan 19;305(3):491-503. PMID:11152607<ref>PMID:11152607</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 1e5m" style="background-color:#fffaf0;"></div>

==See Also==
*[[Acyl carrier protein synthase 3D structures|Acyl carrier protein synthase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Synechocystis sp. PCC 6803]]
[[Category: Dehesh K]]
[[Category: Edwards P]]
[[Category: Lindqvist Y]]
[[Category: Moche M]]