View source for 1cyn


==CYCLOPHILIN B COMPLEXED WITH [D-(CHOLINYLESTER)SER8]-CYCLOSPORIN==
<StructureSection load='1cyn' size='340' side='right'caption='[[1cyn]], [[Resolution|resolution]] 1.85&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1cyn]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Tolypocladium_inflatum Tolypocladium inflatum]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CYN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1CYN FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.85&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ABA:ALPHA-AMINOBUTYRIC+ACID'>ABA</scene>, <scene name='pdbligand=BMT:4-METHYL-4-[(E)-2-BUTENYL]-4,N-METHYL-THREONINE'>BMT</scene>, <scene name='pdbligand=DSN:D-SERINE'>DSN</scene>, <scene name='pdbligand=MLE:N-METHYLLEUCINE'>MLE</scene>, <scene name='pdbligand=MVA:N-METHYLVALINE'>MVA</scene>, <scene name='pdbligand=SAR:SARCOSINE'>SAR</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1cyn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1cyn OCA], [https://pdbe.org/1cyn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1cyn RCSB], [https://www.ebi.ac.uk/pdbsum/1cyn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1cyn ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/PPIB_HUMAN PPIB_HUMAN] Defects in PPIB are the cause of osteogenesis imperfecta type 9 (OI9) [MIM:[https://omim.org/entry/259440 259440]. OI9 is a connective tissue disorder characterized by bone fragility, low bone mass and bowing of limbs due to multiple fractures. Short limb dwarfism and blue sclerae are observed in some but not all patients.<ref>PMID:19781681</ref> <ref>PMID:20089953</ref> 
== Function ==
[https://www.uniprot.org/uniprot/PPIB_HUMAN PPIB_HUMAN] PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides.
== 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/cy/1cyn_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.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=1cyn ConSurf].
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== Publication Abstract from PubMed ==
The crystal structure of a complex between recombinant human cyclophilin B (CypB) and a cyclosporin A (CsA) analog has been determined and refined at 1.85-A resolution to a crystallographic R factor of 16.0%. The overall structures of CypB and of cyclophilin A (CypA) are similar; however, significant differences occur in two loops and at the N and C termini. The CsA-binding pocket in CypB has the same structure as in CypA and cyclosporin shows a similar bound conformation and network of interactions in both CypB and CypA complexes. The network of the water-mediated contacts is also essentially conserved. The higher potency of the CypB/CsA complex versus CypA/CsA in inhibiting the Ca(2+)- and calmodulin-dependent protein phosphatase calcineurin is discussed in terms of the structural differences between the two complexes. The three residues Arg90, Lys113, and Ala128 and the loop containing Arg158 on the surface of CypB are likely to modulate the differences in calcineurin inhibition between CypA and CypB.

X-ray structure of a cyclophilin B/cyclosporin complex: comparison with cyclophilin A and delineation of its calcineurin-binding domain.,Mikol V, Kallen J, Walkinshaw MD Proc Natl Acad Sci U S A. 1994 May 24;91(11):5183-6. PMID:8197205<ref>PMID:8197205</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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==See Also==
*[[Cyclophilin 3D structures|Cyclophilin 3D structures]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Tolypocladium inflatum]]
[[Category: Kallen J]]
[[Category: Mikol V]]
[[Category: Walkinshaw MD]]