View source for 2yfr


==Crystal structure of inulosucrase from Lactobacillus johnsonii NCC533==
<StructureSection load='2yfr' size='340' side='right'caption='[[2yfr]], [[Resolution|resolution]] 1.75&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[2yfr]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Lactobacillus_johnsonii Lactobacillus johnsonii]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2YFR OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2YFR 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]] 1.75&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=CA:CALCIUM+ION'>CA</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=2yfr FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2yfr OCA], [https://pdbe.org/2yfr PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2yfr RCSB], [https://www.ebi.ac.uk/pdbsum/2yfr PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2yfr ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/INUS_LACJO INUS_LACJO] Fructosyltransferase that catalyzes the polymerization of the fructose moiety of sucrose to produce inulin polymer and inulin oligosaccharides such as 1-kestose and nystose.<ref>PMID:18408060</ref> <ref>PMID:21801732</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Fructansucrases (FSs) catalyze a transfructosylation reaction with sucrose as substrate to produce fructo-oligosaccharides and fructan polymers that contain either beta-2,1 glycosidic linkages (inulin) or beta-2,6 linkages (levan). Levan-synthesizing FSs (levansucrases) have been most extensively investigated, while detailed information on inulosucrases is limited. Importantly, the molecular basis of the different product specificities of levansucrases and inulosucrases is poorly understood. We have elucidated the three-dimensional structure of a truncated active bacterial GH68 inulosucrase, InuJ of Lactobacillus johnsonii NCC533 (residues 145-708), in its apo form, with a bound substrate (sucrose), and with a transfructosylation product. The sucrose binding pocket and the sucrose binding mode are virtually identical with those of GH68 levansucrases, confirming that both enzyme types use the same fully conserved structural framework for the binding and cleavage of the donor substrate sucrose in the active site. The binding mode of the first transfructosylation product 1-kestose (Fru-beta(2-1)-Fru-alpha(2-1)-Glc, where Fru=fructose and Glc=glucose) in subsites -1 to +2 shows for the first time how inulin-type fructo-oligosaccharide bind in GH68 FS and how an inulin-type linkage can be formed. Surprisingly, observed interactions with the sugar in subsites +1 and +2 are provided by residues that are also present in levansucrases. The binding mode of 1-kestose and the presence of a more distant sucrose binding site suggest that residues beyond the +2 subsite, in particular residues from the nonconserved 1B-1C loop, determine product linkage type specificity in GH68 FSs.

Crystal Structure of Inulosucrase from Lactobacillus: Insights into the Substrate Specificity and Product Specificity of GH68 Fructansucrases.,Pijning T, Anwar MA, Boger M, Dobruchowska JM, Leemhuis H, Kralj S, Dijkhuizen L, Dijkstra BW J Mol Biol. 2011 Sep 9;412(1):80-93. Epub 2011 Jul 23. PMID:21801732<ref>PMID:21801732</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 2yfr" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Lactobacillus johnsonii]]
[[Category: Large Structures]]
[[Category: Anwar MA]]
[[Category: Dijkhuizen L]]
[[Category: Dijkstra BW]]
[[Category: Kralj S]]
[[Category: Leemhuis H]]
[[Category: Pijning T]]