View source for 2p2v


==Crystal structure analysis of monofunctional alpha-2,3-sialyltransferase Cst-I from Campylobacter jejuni==
<StructureSection load='2p2v' size='340' side='right'caption='[[2p2v]], [[Resolution|resolution]] 1.85&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2p2v]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/"campylobacter_fetus_subsp._jejuni"_smibert_1974 "campylobacter fetus subsp. jejuni" smibert 1974]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2P2V OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2P2V FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=CSF:CYTIDINE-5-MONOPHOSPHATE-3-FLUORO-N-ACETYL-NEURAMINIC+ACID'>CSF</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1ro7|1ro7]], [[1ro8|1ro8]], [[2drj|2drj]], [[2p56|2p56]]</div></td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">cst-I ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=197 "Campylobacter fetus subsp. jejuni" Smibert 1974])</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=2p2v FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2p2v OCA], [https://pdbe.org/2p2v PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2p2v RCSB], [https://www.ebi.ac.uk/pdbsum/2p2v PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2p2v ProSAT]</span></td></tr>
</table>
== 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/p2/2p2v_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=2p2v ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Sialic acid is an essential sugar in biology that plays key roles in numerous cellular processes and interactions. The biosynthesis of sialylated glycoconjugates is catalyzed by five distinct families of sialyltransferases. In the last 25 years, there has been much research on the enzymes themselves, their genes, and their reaction products, but we still do not know the precise molecular mechanism of action for this class of glycosyltransferase. We previously reported the first detailed structural and kinetic characterization of Cst-II, a bifunctional sialyltransferase (CAZy GT-42) from the bacterium Campylobacter jejuni [Chiu et al. (2004) Nat. Struct. Mol. Biol. 11, 163-170]. This enzyme can use both Gal-beta-1,3/4-R and Neu5Ac-alpha-2,3-Gal-beta-1,3/4-R as acceptor sugars. A second sialyltransferase from this bacterium, Cst-I, has been shown to utilize solely Gal-beta-1,3/4-R as the acceptor sugar in its transferase reaction. We report here the structural and kinetic characterization of this monofunctional enzyme, which belongs to the same sialyltransferase family as Cst-II, in both apo and substrate bound form. Our structural data show that Cst-I adopts a similar GTA-type glycosyltransferase fold to that of the bifunctional Cst-II, with conservation of several key noncharged catalytic residues. Significant differences are found, however, between the two enzymes in the lid domain region, which is critical to the creation of the acceptor sugar binding site. Furthermore, molecular modeling of various acceptor sugars within the active sites of these enzymes provides significant new insights into the structural basis for substrate specificities within this biologically important enzyme class.

Structural analysis of the alpha-2,3-sialyltransferase Cst-I from Campylobacter jejuni in apo and substrate-analogue bound forms.,Chiu CP, Lairson LL, Gilbert M, Wakarchuk WW, Withers SG, Strynadka NC Biochemistry. 2007 Jun 19;46(24):7196-204. Epub 2007 May 23. PMID:17518445<ref>PMID:17518445</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 2p2v" style="background-color:#fffaf0;"></div>

==See Also==
*[[Sialyltransferase 3D structures|Sialyltransferase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Campylobacter fetus subsp. jejuni smibert 1974]]
[[Category: Large Structures]]
[[Category: Chiu, C P]]
[[Category: Gilbert, M]]
[[Category: Lairson, L L]]
[[Category: Strynadka, N C]]
[[Category: Wakarchuk, W W]]
[[Category: Withers, S G]]
[[Category: Mixed alpha-beta]]
[[Category: Transferase]]