4ouh

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==Crystal structure of the FP domain of Human PI31 Proteasome Inhibitor==
==Crystal structure of the FP domain of Human PI31 Proteasome Inhibitor==
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<StructureSection load='4ouh' size='340' side='right' caption='[[4ouh]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
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<StructureSection load='4ouh' size='340' side='right'caption='[[4ouh]], [[Resolution|resolution]] 2.00&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
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<table><tr><td colspan='2'>[[4ouh]] is a 4 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4OUH OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4OUH FirstGlance]. <br>
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<table><tr><td colspan='2'>[[4ouh]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4OUH OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4OUH FirstGlance]. <br>
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</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=4ouh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ouh OCA], [http://www.rcsb.org/pdb/explore.do?structureId=4ouh RCSB], [http://www.ebi.ac.uk/pdbsum/4ouh PDBsum]</span></td></tr>
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2&#8491;</td></tr>
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4ouh FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ouh OCA], [https://pdbe.org/4ouh PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ouh RCSB], [https://www.ebi.ac.uk/pdbsum/4ouh PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ouh ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
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[[http://www.uniprot.org/uniprot/PSMF1_HUMAN PSMF1_HUMAN]] Plays an important role in control of proteasome function. Inhibits the hydrolysis of protein and peptide substrates by the 20S proteasome. Also inhibits the activation of the proteasome by the proteasome regulatory proteins PA700 and PA28.<ref>PMID:10764772</ref>
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[https://www.uniprot.org/uniprot/PSMF1_HUMAN PSMF1_HUMAN] Plays an important role in control of proteasome function. Inhibits the hydrolysis of protein and peptide substrates by the 20S proteasome. Also inhibits the activation of the proteasome by the proteasome regulatory proteins PA700 and PA28.<ref>PMID:10764772</ref>
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<div style="background-color:#fffaf0;">
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== Publication Abstract from PubMed ==
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Fbxo7 and PI31 contain a conserved FP domain that mediates the homo-/hetero-dimerization of the proteins. The PI31 FP domain may also interact with the F-box motif in Fbxo7. The FP domain-mediated protein-protein interactions are important for the functions of Fbxo7 and PI31. The crystal structures of the Fbxo7 and PI31 FP domains were determined previously, showing that a C-terminal helix in the Fbxo7 FP domain was not present in the PI31 FP domain. Here, we determine the crystal structure of the PI31 FP domain using a longer protein construct. The structure is comparable to the Fbxo7 FP domain (including the C-terminal helix), indicating that the two FP domains share the same global fold. However, the FP domains also harbor their own characteristic structural features, mainly in the longest loop (which has a largely fixed conformation due to extensive hydrogen bonding and hydrophobic interactions) and the C-terminal end regions. The crystal structures also reveal fundamental differences in the modes of protein-protein interactions mediated by the two FP domains: the PI31 FP domain utilizes either an alpha interface or beta interface for homodimeric interaction, whereas the Fbxo7 FP domain utilizes an alphabeta interface. We perform modeling studies to show that the domain-specific structural features may dictate specific modes of inter-domain interactions. We propose that a heterodimeric interaction would be mediated by an alphabeta interface consisting of the alpha-helical and beta-sheet surfaces of the Fbxo7 and PI31 FP domains, respectively. We also discuss the structural/functional significance of various modes of FP domain-mediated protein-protein interactions.
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The FP domains of PI31 and Fbxo7 have the same protein fold but very different modes of protein-protein interaction.,Shang J, Huang X, Du Z J Biomol Struct Dyn. 2014 Sep 30:1-11. PMID:25266262<ref>PMID:25266262</ref>
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From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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</div>
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== References ==
== References ==
<references/>
<references/>
__TOC__
__TOC__
</StructureSection>
</StructureSection>
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[[Category: Du, Z]]
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[[Category: Homo sapiens]]
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[[Category: Huang, X]]
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[[Category: Large Structures]]
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[[Category: Shang, J]]
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[[Category: Du Z]]
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[[Category: C-terminal extention alpha helix]]
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[[Category: Huang X]]
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[[Category: Proteasome inhibitor]]
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[[Category: Shang J]]
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[[Category: Protein binding]]
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Current revision

Crystal structure of the FP domain of Human PI31 Proteasome Inhibitor

PDB ID 4ouh

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