7abt: Difference between revisions
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==== | ==Structure of PPIA in complex with PR dipeptide repeat== | ||
<StructureSection load='7abt' size='340' side='right'caption='[[7abt]]' scene=''> | <StructureSection load='7abt' size='340' side='right'caption='[[7abt]], [[Resolution|resolution]] 1.31Å' scene=''> | ||
== Structural highlights == | == Structural highlights == | ||
<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id= OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol= FirstGlance]. <br> | <table><tr><td colspan='2'>[[7abt]] is a 2 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=7ABT OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7ABT FirstGlance]. <br> | ||
</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=7abt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7abt OCA], [https://pdbe.org/7abt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7abt RCSB], [https://www.ebi.ac.uk/pdbsum/7abt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7abt ProSAT]</span></td></tr> | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 1.31Å</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=7abt FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7abt OCA], [https://pdbe.org/7abt PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7abt RCSB], [https://www.ebi.ac.uk/pdbsum/7abt PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7abt ProSAT]</span></td></tr> | |||
</table> | </table> | ||
== Function == | |||
[https://www.uniprot.org/uniprot/PPIA_HUMAN PPIA_HUMAN] PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Amyotrophic lateral sclerosis and frontotemporal dementia are two neurodegenerative diseases with overlapping clinical features and the pathological hallmark of cytoplasmic deposits of misfolded proteins. The most frequent cause of familial forms of these diseases is a hexanucleotide repeat expansion in the non-coding region of the C9ORF72 gene that is translated into dipeptide repeat polymers. Here we show that proline/arginine repeat polymers derail protein folding by sequestering molecular chaperones. We demonstrate that proline/arginine repeat polymers inhibit the folding catalyst activity of PPIA, an abundant molecular chaperone and prolyl isomerase in the brain that is altered in amyotrophic lateral sclerosis. NMR spectroscopy reveals that proline/arginine repeat polymers bind to the active site of PPIA. X-ray crystallography determines the atomic structure of a proline/arginine repeat polymer in complex with the prolyl isomerase and defines the molecular basis for the specificity of disease-associated proline/arginine polymer interactions. The combined data establish a toxic mechanism that is specific for proline/arginine dipeptide repeat polymers and leads to derailed protein homeostasis in C9orf72-associated neurodegenerative diseases. | |||
Proline/arginine dipeptide repeat polymers derail protein folding in amyotrophic lateral sclerosis.,Babu M, Favretto F, de Opakua AI, Rankovic M, Becker S, Zweckstetter M Nat Commun. 2021 Jun 7;12(1):3396. doi: 10.1038/s41467-021-23691-y. PMID:34099711<ref>PMID:34099711</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 7abt" style="background-color:#fffaf0;"></div> | |||
==See Also== | |||
*[[Cyclophilin 3D structures|Cyclophilin 3D structures]] | |||
== References == | |||
<references/> | |||
__TOC__ | __TOC__ | ||
</StructureSection> | </StructureSection> | ||
[[Category: Homo sapiens]] | |||
[[Category: Large Structures]] | [[Category: Large Structures]] | ||
[[Category: | [[Category: Babu M]] | ||
[[Category: Becker S]] | |||
[[Category: Zweckstetter M]] | |||
Latest revision as of 15:06, 1 February 2024
Structure of PPIA in complex with PR dipeptide repeatStructure of PPIA in complex with PR dipeptide repeat
Structural highlights
FunctionPPIA_HUMAN PPIases accelerate the folding of proteins. It catalyzes the cis-trans isomerization of proline imidic peptide bonds in oligopeptides. Publication Abstract from PubMedAmyotrophic lateral sclerosis and frontotemporal dementia are two neurodegenerative diseases with overlapping clinical features and the pathological hallmark of cytoplasmic deposits of misfolded proteins. The most frequent cause of familial forms of these diseases is a hexanucleotide repeat expansion in the non-coding region of the C9ORF72 gene that is translated into dipeptide repeat polymers. Here we show that proline/arginine repeat polymers derail protein folding by sequestering molecular chaperones. We demonstrate that proline/arginine repeat polymers inhibit the folding catalyst activity of PPIA, an abundant molecular chaperone and prolyl isomerase in the brain that is altered in amyotrophic lateral sclerosis. NMR spectroscopy reveals that proline/arginine repeat polymers bind to the active site of PPIA. X-ray crystallography determines the atomic structure of a proline/arginine repeat polymer in complex with the prolyl isomerase and defines the molecular basis for the specificity of disease-associated proline/arginine polymer interactions. The combined data establish a toxic mechanism that is specific for proline/arginine dipeptide repeat polymers and leads to derailed protein homeostasis in C9orf72-associated neurodegenerative diseases. Proline/arginine dipeptide repeat polymers derail protein folding in amyotrophic lateral sclerosis.,Babu M, Favretto F, de Opakua AI, Rankovic M, Becker S, Zweckstetter M Nat Commun. 2021 Jun 7;12(1):3396. doi: 10.1038/s41467-021-23691-y. PMID:34099711[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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