View source for 6gta


==Alpha-galactosidase mutant D378A from Thermotoga maritima in complex with intact cyclohexene-based carbasugar mimic of galactose with 3,5 difluorophenyl leaving group==
<StructureSection load='6gta' size='340' side='right' caption='[[6gta]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6gta]] is a 1 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6GTA OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6GTA FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=F9W:(1~{R},2~{S},3~{S},6~{S})-6-[3,5-bis(fluoranyl)phenoxy]-4-(hydroxymethyl)cyclohex-4-ene-1,2,3-triol'>F9W</scene>, <scene name='pdbligand=MG:MAGNESIUM+ION'>MG</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Alpha-galactosidase Alpha-galactosidase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.22 3.2.1.22] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6gta FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6gta OCA], [http://pdbe.org/6gta PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6gta RCSB], [http://www.ebi.ac.uk/pdbsum/6gta PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6gta ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/AGAL_THEMA AGAL_THEMA]] Hydrolyzes the short-chain alpha-galactosaccharides raffinose, melibiose and stachyose.<ref>PMID:25486100</ref> <ref>PMID:9741105</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Mechanism-based glycoside hydrolase inhibitors are carbohydrate analogs that mimic the natural substrate's structure. Their covalent bond formation with the glycoside hydrolase makes these compounds excellent tools for chemical biology and potential drug candidates. Here we report the synthesis of cyclohexene-based alpha-galactopyranoside mimics and the kinetic and structural characterization of their inhibitory activity toward an alpha-galactosidase from Thermotoga maritima (TmGalA). By solving the structures of several enzyme-bound species during mechanism-based covalent inhibition of TmGalA, we show that the Michaelis complexes for intact inhibitor and product have half-chair ((2)H3) conformations for the cyclohexene fragment, while the covalently linked intermediate adopts a flattened half-chair ((2)H3) conformation. Hybrid QM/MM calculations confirm the structural and electronic properties of the enzyme-bound species and provide insight into key interactions in the enzyme-active site. These insights should stimulate the design of mechanism-based glycoside hydrolase inhibitors with tailored chemical properties.

Revealing the mechanism for covalent inhibition of glycoside hydrolases by carbasugars at an atomic level.,Ren W, Pengelly R, Farren-Dai M, Shamsi Kazem Abadi S, Oehler V, Akintola O, Draper J, Meanwell M, Chakladar S, Swiderek K, Moliner V, Britton R, Gloster TM, Bennet AJ Nat Commun. 2018 Aug 13;9(1):3243. doi: 10.1038/s41467-018-05702-7. PMID:30104598<ref>PMID:30104598</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6gta" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Alpha-galactosidase]]
[[Category: Gloster, T M]]
[[Category: Pengelly, R J]]
[[Category: Carbohydrate processing enzyme]]
[[Category: Galactosidase]]
[[Category: Glycoside hydrolase]]
[[Category: Hydrolase]]
[[Category: Inhibitor]]