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4sli

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{{Seed}}
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==LEECH INTRAMOLECULAR TRANS-SIALIDASE COMPLEXED WITH 2-PROPENYL-NEU5AC, AN INACTIVE SUBSTRATE ANALOGUE==
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[[Image:4sli.png|left|200px]]
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<StructureSection load='4sli' size='340' side='right' caption='[[4sli]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[4sli]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Macde Macde]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4SLI OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4SLI FirstGlance]. <br>
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</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CNP:2-PROPENYL-N-ACETYL-NEURAMIC+ACID'>CNP</scene><br>
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<tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">T7 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=6405 MACDE])</td></tr>
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<tr><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Exo-alpha-sialidase Exo-alpha-sialidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.18 3.2.1.18] </span></td></tr>
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<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4sli FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4sli OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4sli RCSB], [http://www.ebi.ac.uk/pdbsum/4sli PDBsum]</span></td></tr>
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<table>
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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/sl/4sli_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/chain_selection.php?pdb_ID=2ata ConSurf].
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<div style="clear:both"></div>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Intramolecular trans-sialidase from leech (Macrobdella decora) is the first member of the sialidase superfamily found to exhibit strict specificity towards the cleavage of terminal Neu5Acalpha2--&gt;3Gal linkage in sialoglycoconjugates. Its release of 2,7-anhydro-Neu5Ac instead of Neu5Ac indicates that it catalyzes an intramolecular trans-sialosyl reaction. Crystal structures of its complexes with an inactive substrate analogue 2-propenyl-Neu5Ac, and with the product 2,7-anhydro-Neu5Ac, have been determined to 1.8 A resolution. The boat conformation of the pyranose observed in the complexes supports the proposed enzymatic mechanism that O7 of an axial 6-glycerol group attacks the positively charged C2 of the intermediate. A generalized mechanism is proposed for the sialidase superfamily.
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The 1.8 A structures of leech intramolecular trans-sialidase complexes: evidence of its enzymatic mechanism.,Luo Y, Li SC, Li YT, Luo M J Mol Biol. 1999 Jan 8;285(1):323-32. PMID:9878409<ref>PMID:9878409</ref>
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The line below this paragraph, containing "STRUCTURE_4sli", creates the "Structure Box" on the page.
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You may change the PDB parameter (which sets the PDB file loaded into the applet)
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or the SCENE parameter (which sets the initial scene displayed when the page is loaded),
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or leave the SCENE parameter empty for the default display.
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-->
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{{STRUCTURE_4sli| PDB=4sli | SCENE= }}
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===LEECH INTRAMOLECULAR TRANS-SIALIDASE COMPLEXED WITH 2-PROPENYL-NEU5AC, AN INACTIVE SUBSTRATE ANALOGUE===
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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== References ==
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<!--
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<references/>
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The line below this paragraph, {{ABSTRACT_PUBMED_9878409}}, adds the Publication Abstract to the page
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__TOC__
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(as it appears on PubMed at http://www.pubmed.gov), where 9878409 is the PubMed ID number.
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</StructureSection>
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-->
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{{ABSTRACT_PUBMED_9878409}}
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==About this Structure==
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4SLI is a 1 chain structure of sequence from [http://en.wikipedia.org/wiki/Macrobdella_decora Macrobdella decora]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4SLI OCA].
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==Reference==
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<ref group="xtra">PMID:9878409</ref><references group="xtra"/>
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[[Category: Exo-alpha-sialidase]]
[[Category: Exo-alpha-sialidase]]
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[[Category: Macrobdella decora]]
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[[Category: Macde]]
[[Category: Li, S C.]]
[[Category: Li, S C.]]
[[Category: Li, Y T.]]
[[Category: Li, Y T.]]
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[[Category: Enzyme]]
[[Category: Enzyme]]
[[Category: Intramolecular trans-sialidase]]
[[Category: Intramolecular trans-sialidase]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Feb 16 20:11:08 2009''
 

Revision as of 07:32, 5 June 2014

LEECH INTRAMOLECULAR TRANS-SIALIDASE COMPLEXED WITH 2-PROPENYL-NEU5AC, AN INACTIVE SUBSTRATE ANALOGUE

4sli, resolution 1.80Å

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