1m4w

<table><tr><td colspan='2'>[[1m4w]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/"acetomadura_flexuosa"_krasil'nikov_and_agre_1964 "acetomadura flexuosa" krasil'nikov and agre 1964]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1M4W OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1M4W FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ACT:ACETATE+ION'>ACT</scene>, <scene name='pdbligand=BMA:BETA-D-MANNOSE'>BMA</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=MAN:ALPHA-D-MANNOSE'>MAN</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene></td></tr>

<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Endo-1,4-beta-xylanase Endo-1,4-beta-xylanase], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.8 3.2.1.8] </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=1m4w FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1m4w OCA], [http://pdbe.org/1m4w PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1m4w RCSB], [http://www.ebi.ac.uk/pdbsum/1m4w PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1m4w ProSAT]</span></td></tr>

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== Publication Abstract from PubMed ==

The crystal structures of thermophilic xylanases from Chaetomium thermophilum and Nonomuraea flexuosa were determined at 1.75 and 2.1 A resolution, respectively. Both enzymes have the overall fold typical to family 11 xylanases with two highly twisted beta-sheets forming a large cleft. The comparison of 12 crystal structures of family 11 xylanases from both mesophilic and thermophilic organisms showed that the structures of different xylanases are very similar. The sequence identity differences correlated well with the structural differences. Several minor modifications appeared to be responsible for the increased thermal stability of family 11 xylanases: (a) higher Thr : Ser ratio (b) increased number of charged residues, especially Arg, resulting in enhanced polar interactions, and (c) improved stabilization of secondary structures involved the higher number of residues in the beta-strands and stabilization of the alpha-helix region. Some members of family 11 xylanases have a unique strategy to improve their stability, such as a higher number of ion pairs or aromatic residues on protein surface, a more compact structure, a tighter packing, and insertions at some regions resulting in enhanced interactions.

Three-dimensional structures of thermophilic beta-1,4-xylanases from Chaetomium thermophilum and Nonomuraea flexuosa. Comparison of twelve xylanases in relation to their thermal stability.,Hakulinen N, Turunen O, Janis J, Leisola M, Rouvinen J Eur J Biochem. 2003 Apr;270(7):1399-412. PMID:12653995<ref>PMID:12653995</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>

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== References ==

<references/>

[[Category: Acetomadura flexuosa krasil'nikov and agre 1964]]

[[Category: Endo-1,4-beta-xylanase]]

[[Category: Hakulinen, N]]

[[Category: Janis, J]]

[[Category: Leisola, M]]

[[Category: Rouvinen, J]]

[[Category: Turunen, O]]

[[Category: Xylanase]]