View source for 3wms


==The crystal structure of Y195I mutant alpha-cyclodextrin glycosyltransferase from Paenibacillus macerans==
<StructureSection load='3wms' size='340' side='right'caption='[[3wms]], [[Resolution|resolution]] 2.30&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[3wms]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Paenibacillus_macerans Paenibacillus macerans]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3WMS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=3WMS 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]] 2.3&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></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=3wms FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3wms OCA], [https://pdbe.org/3wms PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=3wms RCSB], [https://www.ebi.ac.uk/pdbsum/3wms PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=3wms ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/CDGT1_PAEMA CDGT1_PAEMA] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Cyclodextrin glycosyltransferase (EC 2.4.1.19) (CGTase) is an extracellular bacterial enzyme which has the unique capability of forming cyclodextrins from starch. Our previous investigation revealed that a mutant Y195I alpha-CGTase drastically altered the cyclodextrin specificity by switching toward the synthesis of both beta- and gamma-CDs (Xie et al., 2013a,b). In this study, we determined one X-ray structure of the mutant Y195I alpha-CGTase at 2.3A. The overall structure was similar to that of the typical beta-CGTase from Bacillus circulans 251, with minor difference in flexible domains since they showed about 70% homogeneity of amino acid sequences. The central site with isoleucine tended to be more flexible than tyrosine thus made the sugar chain, during the cyclization process, form a larger cyclodextrin like beta- and gamma-CDs surrounding the central site instead of alpha-CD. Superposition of the structure of Y195I alpha-CGTase with those of beta-CGTase and gamma-CGTase showed that residues Lys232, Lys89 and Arg177 at subsites +2, -3 and -7 could form smaller substrate binding cavity. In summary, the crystal structure revealed that moderate increase of mobility of the central site resulted in the switched product specificity from alpha-CD to beta- and gamma-CDs of the mutant Y195I alpha-CGTase. The space differences alongside the active domain may be another factor that impacts the product specificity of the CGTase.

Structural basis of a mutant Y195I alpha-cyclodextrin glycosyltransferase with switched product specificity from alpha-cyclodextrin to beta-/gamma-cyclodextrin.,Xie T, Hou Y, Li D, Yue Y, Qian S, Chao Y J Biotechnol. 2014 Jul 20;182-183:92-6. doi: 10.1016/j.jbiotec.2014.03.014. Epub , 2014 Mar 15. PMID:24637377<ref>PMID:24637377</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 3wms" style="background-color:#fffaf0;"></div>

==See Also==
*[[Glycosyltransferase 3D structures|Glycosyltransferase 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Paenibacillus macerans]]
[[Category: Chao YP]]
[[Category: Hou YJ]]
[[Category: Li DF]]
[[Category: Qian SJ]]
[[Category: Xie T]]
[[Category: Yue Y]]