1nbc

<StructureSection load='1nbc' size='340' side='right' caption='[[1nbc]], [[Resolution|resolution]] 1.75&Aring;' scene=''>

<table><tr><td colspan='2'>[[1nbc]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/"ruminiclostridium_thermocellum"_yutin_and_galperin_2013 "ruminiclostridium thermocellum" yutin and galperin 2013]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1NBC OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1NBC FirstGlance]. <br>

</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CA:CALCIUM+ION'>CA</scene></td></tr>

<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CIPB ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=1515 "Ruminiclostridium thermocellum" Yutin and Galperin 2013])</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=1nbc FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1nbc OCA], [http://pdbe.org/1nbc PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1nbc RCSB], [http://www.ebi.ac.uk/pdbsum/1nbc PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1nbc ProSAT]</span></td></tr>

[[http://www.uniprot.org/uniprot/CIPA_CLOTH CIPA_CLOTH]] Acts as a scaffolding protein in the cellulosome. It promotes binding of cellulose to the catalytic domains of the cellulolytic enzymes.

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== Publication Abstract from PubMed ==

The crystal structure of a family-III cellulose-binding domain (CBD) from the cellulosomal scaffoldin subunit of Clostridium thermocellum has been determined at 1.75 A resolution. The protein forms a nine-stranded beta sandwich with a jelly roll topology and binds a calcium ion. conserved, surface-exposed residues map into two defined surfaces located on opposite sides of the molecule. One of these faces is dominated by a planar linear strip of aromatic and polar residues which are proposed to interact with crystalline cellulose. The other conserved residues are contained in a shallow groove, the function of which is currently unknown, and which has not been observed previously in other families of CBDs. On the basis of modeling studies combined with comparisons of recently determined NMR structures for other CBDs, a general model for the binding of CBDs to cellulose is presented. Although the proposed binding of the CBD to cellulose is essentially a surface interaction, specific types and combinations of amino acids appear to interact selectively with glucose moieties positioned on three adjacent chains of the cellulose surface. The major interaction is characterized by the planar strip of aromatic residues, which align along one of the chains. In addition, polar amino acid residues are proposed to anchor the CBD molecule to two other adjacent chains of crystalline cellulose.

 

<div class="pdbe-citations 1nbc" style="background-color:#fffaf0;"></div>

== References ==

[[Category: Ruminiclostridium thermocellum yutin and galperin 2013]]

[[Category: Lamed, R]]

[[Category: Steitz, T A]]

[[Category: Tormo, J]]

[[Category: Cellulose degradation]]

[[Category: Scafoldin]]