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1om0

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Revision as of 09:58, 1 November 2017

crystal structure of xylanase inhibitor protein (XIP-I) from wheat

Structural highlights

1om0 is a 1 chain structure with sequence from Triticum aestivum. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Ligands:	, ,
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[XIP1_WHEAT] Fungal xylanase inhibitor. Possesses competitive inhibiting activity against fungal endo-1,4-beta-D-xylanases belonging to glycoside hydrolase family 10 (GH10) and family 11 (GH11). Possesses also inhibitory activity towards barley alpha-amylases. Binding to xylanases or amylases is necessary for inhibition activity. May function in plant defense against secreted fungal pathogen xylanases. Is similar to class III chitinases, but does not exhibit chitinase activity.^[1] ^[2] ^[3] ^[4]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

A novel class of proteinaceous inhibitors exhibiting specificity towards microbial xylanases has recently been discovered in cereals. The three-dimensional structure of xylanase inhibitor protein I (XIP-I) from wheat (Triticum aestivum, var. Soisson) was determined by X-ray crystallography at 1.8 A (1 A=0.1 nm) resolution. The inhibitor possesses a (beta/alpha)(8) barrel fold and has structural features typical of glycoside hydrolase family 18, namely two consensus regions, approximately corresponding to the third and fourth barrel strands, and two non-proline cis -peptide bonds, Ser(36)-Phe and Trp(256)-Asp (in XIP-I numbering). However, detailed structural analysis of XIP-I revealed several differences in the region homologous with the active site of chitinases. The catalytic glutamic acid residue of family 18 chitinases [Glu(127) in hevamine, a chitinase/lysozyme from the rubber tree (Hevea brasiliensis)] is conserved in the structure of the inhibitor (Glu(128)), but its side chain is fully engaged in salt bridges with two neighbouring arginine residues. Gly(81), located in subsite -1 of hevamine, where the reaction intermediate is formed, is replaced by Tyr(80) in XIP-I. The tyrosine side chain fills the subsite area and makes a strong hydrogen bond with the side chain of Glu(190) located at the opposite side of the cleft, preventing access of the substrate to the catalytic glutamic acid. The structural differences in the inhibitor cleft structure probably account for the lack of activity of XIP-I towards chitin.

Structural analysis of xylanase inhibitor protein I (XIP-I), a proteinaceous xylanase inhibitor from wheat (Triticum aestivum, var. Soisson).,Payan F, Flatman R, Porciero S, Williamson G, Juge N, Roussel A Biochem J. 2003 Jun 1;372(Pt 2):399-405. PMID:12617724^[5]

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

References

↑ Elliott GO, Hughes RK, Juge N, Kroon PA, Williamson G. Functional identification of the cDNA coding for a wheat endo-1,4-beta-D-xylanase inhibitor. FEBS Lett. 2002 May 22;519(1-3):66-70. PMID:12023019
↑ McLauchlan WR, Garcia-Conesa MT, Williamson G, Roza M, Ravestein P, Maat J. A novel class of protein from wheat which inhibits xylanases. Biochem J. 1999 Mar 1;338 ( Pt 2):441-6. PMID:10024521
↑ Flatman R, McLauchlan WR, Juge N, Furniss C, Berrin JG, Hughes RK, Manzanares P, Ladbury JE, O'Brien R, Williamson G. Interactions defining the specificity between fungal xylanases and the xylanase-inhibiting protein XIP-I from wheat. Biochem J. 2002 Aug 1;365(Pt 3):773-81. PMID:11955286 doi:http://dx.doi.org/10.1042/BJ20020168
↑ Sancho AI, Faulds CB, Svensson B, Bartolome B, Williamson G, Juge N. Cross-inhibitory activity of cereal protein inhibitors against alpha-amylases and xylanases. Biochim Biophys Acta. 2003 Aug 21;1650(1-2):136-44. PMID:12922177
↑ Payan F, Flatman R, Porciero S, Williamson G, Juge N, Roussel A. Structural analysis of xylanase inhibitor protein I (XIP-I), a proteinaceous xylanase inhibitor from wheat (Triticum aestivum, var. Soisson). Biochem J. 2003 Jun 1;372(Pt 2):399-405. PMID:12617724 doi:10.1042/BJ20021802

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1om0"

@@ Line 1: / Line 1: @@
 ==crystal structure of xylanase inhibitor protein (XIP-I) from wheat==
 <StructureSection load='1om0' size='340' side='right' caption='[[1om0]], [[Resolution|resolution]] 1.80&Aring;' scene=''>
@@ Line 4: / Line 5: @@
 <table><tr><td colspan='2'>[[1om0]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Triticum_aestivum Triticum aestivum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1OM0 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1OM0 FirstGlance]. <br>
 </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=NDG:2-(ACETYLAMINO)-2-DEOXY-A-D-GLUCOPYRANOSE'>NDG</scene></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=1om0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1om0 OCA], [http://pdbe.org/1om0 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1om0 RCSB], [http://www.ebi.ac.uk/pdbsum/1om0 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=1om0 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1om0 OCA], [http://pdbe.org/1om0 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1om0 RCSB], [http://www.ebi.ac.uk/pdbsum/1om0 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1om0 ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 16: / Line 17: @@
     <text>to colour the structure by Evolutionary Conservation</text>
   </jmolCheckbox>
-</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/chain_selection.php?pdb_ID=2ata ConSurf].
+</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1om0 ConSurf].
 <div style="clear:both"></div>
 <div style="background-color:#fffaf0;">

1om0

From Proteopedia

Revision as of 09:58, 1 November 2017

crystal structure of xylanase inhibitor protein (XIP-I) from wheat

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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