View source for 1azk

==THREE-DIMENSIONAL STRUCTURES OF THREE ENGINEERED CELLULOSE-BINDING DOMAINS OF CELLOBIOHYDROLASE I FROM TRICHODERMA REESEI, NMR, 19 STRUCTURES==
<StructureSection load='1azk' size='340' side='right' caption='[[1azk]], [[NMR_Ensembles_of_Models | 19 NMR models]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1azk]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Atcc_13631 Atcc 13631]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1AZK OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1AZK FirstGlance]. <br>
</td></tr><tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Cellulose_1,4-beta-cellobiosidase_(non-reducing_end) Cellulose 1,4-beta-cellobiosidase (non-reducing end)], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.2.1.91 3.2.1.91] </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=1azk FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1azk OCA], [http://pdbe.org/1azk PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1azk RCSB], [http://www.ebi.ac.uk/pdbsum/1azk PDBsum]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/GUX1_HYPJE GUX1_HYPJE]] The biological conversion of cellulose to glucose generally requires three types of hydrolytic enzymes: (1) Endoglucanases which cut internal beta-1,4-glucosidic bonds; (2) Exocellobiohydrolases that cut the dissaccharide cellobiose from the non-reducing end of the cellulose polymer chain; (3) Beta-1,4-glucosidases which hydrolyze the cellobiose and other short cello-oligosaccharides to glucose. 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/az/1azk_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <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/main_output.php?pdb_ID=1azk ConSurf].
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== Publication Abstract from PubMed ==
Three-dimensional solution structures for three engineered, synthetic CBDs (Y5A, Y31A, and Y32A) of cellobiohydrolase I (CBHI) from Trichoderma reesei were studied with nuclear magnetic resonance (NMR) and circular dichroism (CD) spectroscopy. According to CD measurements the antiparallel beta-sheet structure of the CBD fold was preserved in all engineered peptides. The three-dimensional NMR-based structures of Y31A and Y32A revealed only small local changes due to mutations in the flat face of CBD, which is expected to bind to crystalline cellulose. Therefore, the structural roles of Y31 and Y32 are minor, but their functional importance is obvious because these mutants do not bind strongly to cellulose. In the case of Y5A, the disruption of the structural framework at the N-terminus and the complete loss of binding affinity implies that Y5 has both structural and functional significance. The number of aromatic residues and their precise spatial arrangement in the flat face of the type I CBD fold appears to be critical for specific binding. A model for the CBD binding in which the three aligned aromatic rings stack onto every other glucose ring of the cellulose polymer is discussed.

Three-dimensional structures of three engineered cellulose-binding domains of cellobiohydrolase I from Trichoderma reesei.,Mattinen ML, Kontteli M, Kerovuo J, Linder M, Annila A, Lindeberg G, Reinikainen T, Drakenberg T Protein Sci. 1997 Feb;6(2):294-303. PMID:9041630<ref>PMID:9041630</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1azk" style="background-color:#fffaf0;"></div>

==See Also==
*[[Cellobiohydrolase|Cellobiohydrolase]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Atcc 13631]]
[[Category: Mattinen, M L]]
[[Category: Cellulase]]
[[Category: Cellulose degradation]]
[[Category: Glycosidase]]
[[Category: Hydrolase]]
[[Category: Nuclear magnetic resonance spectroscopy]]
[[Category: Protein-carbohydrate interaction]]