This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

4fg2

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 14:26, 29 March 2017

Crystal structure of Bacillus Subtilis expansin (EXLX1) in complex with cellotetraose

Structural highlights

4fg2 is a 2 chain structure with sequence from Bacsu. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	,
Related:	4fft, 4fer, 3d30, 2bh0
Gene:	yoaJ, BSU18630 (BACSU)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[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.^[1]

Publication Abstract from PubMed

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.

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^[2]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Kerff F, Amoroso A, Herman R, Sauvage E, Petrella S, Filee P, Charlier P, Joris B, Tabuchi A, Nikolaidis N, Cosgrove DJ. Crystal structure and activity of Bacillus subtilis YoaJ (EXLX1), a bacterial expansin that promotes root colonization. Proc Natl Acad Sci U S A. 2008 Nov 4;105(44):16876-81. Epub 2008 Oct 29. PMID:18971341
↑ Georgelis N, Yennawar NH, Cosgrove DJ. Structural basis for entropy-driven cellulose binding by a type-A cellulose-binding module (CBM) and bacterial expansin. Proc Natl Acad Sci U S A. 2012 Sep 11;109(37):14830-5. Epub 2012 Aug 27. PMID:22927418 doi:http://dx.doi.org/10.1073/pnas.1213200109

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4fg2"

@@ Line 1: / Line 1: @@
 ==Crystal structure of Bacillus Subtilis expansin (EXLX1) in complex with cellotetraose==
 <StructureSection load='4fg2' size='340' side='right' caption='[[4fg2]], [[Resolution|resolution]] 2.10&Aring;' scene=''>
@@ Line 6: / Line 7: @@
 <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4fft|4fft]], [[4fer|4fer]], [[3d30|3d30]], [[2bh0|2bh0]]</td></tr>
 <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=224308 BACSU])</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=4fg2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4fg2 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4fg2 RCSB], [http://www.ebi.ac.uk/pdbsum/4fg2 PDBsum]</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=4fg2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4fg2 OCA], [http://pdbe.org/4fg2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4fg2 RCSB], [http://www.ebi.ac.uk/pdbsum/4fg2 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4fg2 ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 18: / Line 19: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 4fg2" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

4fg2

From Proteopedia

Revision as of 14:26, 29 March 2017

Crystal structure of Bacillus Subtilis expansin (EXLX1) in complex with cellotetraose

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox