4fft

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[[Image:4fft.png|left|200px]]
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==Crystal structure of Bacillus Subtilis expansin (EXLX1) in complex with mixed-linkage glucan==
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<StructureSection load='4fft' size='340' side='right' caption='[[4fft]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
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== Structural highlights ==
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<table><tr><td colspan='2'>[[4fft]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Bacillus_subtilis_subsp._subtilis Bacillus subtilis subsp. subtilis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4FFT OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4FFT FirstGlance]. <br>
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</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACY:ACETIC+ACID'>ACY</scene>, <scene name='pdbligand=BGC:BETA-D-GLUCOSE'>BGC</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
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<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4fer|4fer]], [[3d30|3d30]], [[2bh0|2bh0]]</td></tr>
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<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">yoaJ, BSU18630 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=135461 Bacillus subtilis subsp. subtilis])</td></tr>
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<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=4fft FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4fft OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4fft RCSB], [http://www.ebi.ac.uk/pdbsum/4fft PDBsum]</span></td></tr>
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</table>
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== Function ==
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[[http://www.uniprot.org/uniprot/YOAJ_BACSU YOAJ_BACSU]] May promote colonization of plant roots. May cause loosening and extension of plant cell walls by disrupting non-covalent bonding between cellulose microfibrils and matrix glucans. Has very low expansin activity (in vitro). No enzymatic activity has been found. Binds to peptidoglycan and to plant cell walls.<ref>PMID:18971341</ref>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Components of modular cellulases, type-A cellulose-binding modules (CBMs) bind to crystalline cellulose and enhance enzyme effectiveness, but structural details of the interaction are uncertain. We analyzed cellulose binding by EXLX1, a bacterial expansin with ability to loosen plant cell walls and whose domain D2 has type-A CBM characteristics. EXLX1 strongly binds to crystalline cellulose via D2, whereas its affinity for soluble cellooligosaccharides is weak. Calorimetry indicated cellulose binding was largely entropically driven. We solved the crystal structures of EXLX1 complexed with cellulose-like oligosaccharides to find that EXLX1 binds the ligands through hydrophobic interactions of three linearly arranged aromatic residues in D2. The crystal structures revealed a unique form of ligand-mediated dimerization, with the oligosaccharide sandwiched between two D2 domains in opposite polarity. This report clarifies the molecular target of expansin and the specific molecular interactions of a type-A CBM with cellulose.
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{{STRUCTURE_4fft| PDB=4fft | SCENE= }}
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Structural basis for entropy-driven cellulose binding by a type-A cellulose-binding module (CBM) and bacterial expansin.,Georgelis N, Yennawar NH, Cosgrove DJ Proc Natl Acad Sci U S A. 2012 Sep 11;109(37):14830-5. Epub 2012 Aug 27. PMID:22927418<ref>PMID:22927418</ref>
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===Crystal structure of Bacillus Subtilis expansin (EXLX1) in complex with mixed-linkage glucan===
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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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{{ABSTRACT_PUBMED_22927418}}
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== References ==
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<references/>
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==About this Structure==
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__TOC__
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[[4fft]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Bacillus_subtilis_subsp._subtilis Bacillus subtilis subsp. subtilis]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4FFT OCA].
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</StructureSection>
[[Category: Bacillus subtilis subsp. subtilis]]
[[Category: Bacillus subtilis subsp. subtilis]]
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[[Category: Cosgrove, D J.]]
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[[Category: Cosgrove, D J]]
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[[Category: Georgelis, N.]]
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[[Category: Georgelis, N]]
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[[Category: Yennawar, N H.]]
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[[Category: Yennawar, N H]]
[[Category: Cellulose]]
[[Category: Cellulose]]
[[Category: Cellulose-binding protein]]
[[Category: Cellulose-binding protein]]

Revision as of 19:50, 25 December 2014

Crystal structure of Bacillus Subtilis expansin (EXLX1) in complex with mixed-linkage glucan

4fft, resolution 2.10Å

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