1aoh

<StructureSection load='1aoh' size='340' side='right' caption='[[1aoh]], [[Resolution|resolution]] 1.70&Aring;' scene=''>

<table><tr><td colspan='2'>[[1aoh]] 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=1AOH OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1AOH FirstGlance]. <br>

</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">cipA, Cthe_3077 ([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=1aoh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1aoh OCA], [http://pdbe.org/1aoh PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1aoh RCSB], [http://www.ebi.ac.uk/pdbsum/1aoh PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1aoh 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 quaternary organization of the cellulosome, a multi-enzymatic extracellular complex produced by cellulolytic bacteria, depends on specific interactions between dockerin domains, double EF-hand subunits carried by the catalytic components, and cohesin domains, individual receptor subunits linearly arranged within a non-catalytic scaffolding polypeptide. Cohesin-dockerin complexes with distinct specificities are also thought to mediate the attachment of cellulosomes to the cell membrane. We report here the crystal structure of a single cohesin domain from the scaffolding protein of Clostridium thermocellum. The cohesin domain folds into a nine-stranded beta-sandwich with an overall "jelly roll" topology, similar to that observed in bacterial cellulose-binding domains. Surface-exposed patches of conserved residues promote extensive intermolecular contacts in the crystal, and suggest a possible binding target for the EF-hand pair of the cognate dockerin domain. Comparative studies of cohesin domains indicate that, in spite of low sequence similarities and different functional roles, all cohesin domains share a common nine-stranded beta-barrel fold stabilized by a conserved hydrophobic core. The formation of stable cohesin-dockerin complexes requires the presence of Ca2+. However, the structure of the cohesin domain reported here reveals no obvious Ca2+-binding site, and previous experiments have failed to detect high affinity binding of Ca2+ to the unliganded dockerin domain of endoglucanase CelD. Based on structural and biochemical evidence, we propose a model of the cohesin-dockerin complex in which the dockerin domain requires complexation with its cohesin partner for protein stability and high-affinity Ca2+ binding.

 

== References ==

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

[[Category: Alzari, P M]]

[[Category: Tavares, G]]

[[Category: B-barrel]]

[[Category: Structural protein]]