This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

2m41

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 00:13, 11 September 2015

Solution Structure of the AXH domain of Ataxin-1 in complex with ligand peptide from Capicua

Structural highlights

2m41 is a 2 chain structure with sequence from Human. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	1oa8, 1v06
Gene:	ATXN1, ATX1, SCA1 (HUMAN)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Disease

[ATX1_HUMAN] Spinocerebellar ataxia type 1. Defects in ATXN1 are the cause of spinocerebellar ataxia type 1 (SCA1) [MIM:164400]; also known as olivopontocerebellar atrophy I (OPCA I or OPCA1). Spinocerebellar ataxia is a clinically and genetically heterogeneous group of cerebellar disorders. Patients show progressive incoordination of gait and often poor coordination of hands, speech and eye movements, due to cerebellum degeneration with variable involvement of the brainstem and spinal cord. SCA1 belongs to the autosomal dominant cerebellar ataxias type I (ADCA I) which are characterized by cerebellar ataxia in combination with additional clinical features like optic atrophy, ophthalmoplegia, bulbar and extrapyramidal signs, peripheral neuropathy and dementia. SCA1 is caused by expansion of a CAG repeat in the coding region of ATXN1. Longer expansions result in earlier onset and more severe clinical manifestations of the disease.^[1] ^[2]

Function

[CIC_HUMAN] Transcriptional repressor which may play a role in development of the central nervous system (CNS).^[3] [ATX1_HUMAN] Chromatin-binding factor that repress Notch signaling in the absence of Notch intracellular domain by acting as a CBF1 corepressor. Binds to the HEY promoter and might assist, along with NCOR2, RBPJ-mediated repression. Binds RNA in vitro. May be involved in RNA metabolism. The expansion of the polyglutamine tract may alter this function.^[4]

Publication Abstract from PubMed

A main challenge for structural biologists is to understand the mechanisms that discriminate between molecular interactions and determine function. Here, we show how partner recognition of the AXH domain of the transcriptional co-regulator ataxin-1 is fine-tuned by a subtle balance between self- and hetero-associations. Ataxin-1 is the protein responsible for the hereditary spinocerebellar ataxia type 1, a disease linked to protein aggregation and transcriptional dysregulation. Expansion of a polyglutamine tract is essential for ataxin-1 aggregation, but the sequence-wise distant AXH domain plays an important aggravating role in the process. The AXH domain is also a key element for non-aberrant function as it intervenes in interactions with multiple protein partners. Previous data have shown that AXH is dimeric in solution and forms a dimer of dimers when crystallized. By solving the structure of a complex of AXH with a peptide from the interacting transcriptional repressor CIC, we show that the dimer interface of AXH is displaced by the new interaction and that, when blocked by the CIC peptide AXH aggregation and misfolding are impaired. This is a unique example in which palindromic self- and hetero-interactions within a sequence with chameleon properties discriminate the partner. We propose a drug design strategy for the treatment of SCA1 that is based on the information gained from the AXH/CIC complex.

Protein-protein interactions as a strategy towards protein-specific drug design: the example of ataxin-1.,de Chiara C, Menon RP, Kelly G, Pastore A PLoS One. 2013 Oct 14;8(10):e76456. doi: 10.1371/journal.pone.0076456. PMID:24155902^[5]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Banfi S, Servadio A, Chung MY, Kwiatkowski TJ Jr, McCall AE, Duvick LA, Shen Y, Roth EJ, Orr HT, Zoghbi HY. Identification and characterization of the gene causing type 1 spinocerebellar ataxia. Nat Genet. 1994 Aug;7(4):513-20. PMID:7951322 doi:http://dx.doi.org/10.1038/ng0894-513
↑ Quan F, Janas J, Popovich BW. A novel CAG repeat configuration in the SCA1 gene: implications for the molecular diagnostics of spinocerebellar ataxia type 1. Hum Mol Genet. 1995 Dec;4(12):2411-3. PMID:8634720
↑ Lee CJ, Chan WI, Cheung M, Cheng YC, Appleby VJ, Orme AT, Scotting PJ. CIC, a member of a novel subfamily of the HMG-box superfamily, is transiently expressed in developing granule neurons. Brain Res Mol Brain Res. 2002 Oct 15;106(1-2):151-6. PMID:12393275
↑ Tong X, Gui H, Jin F, Heck BW, Lin P, Ma J, Fondell JD, Tsai CC. Ataxin-1 and Brother of ataxin-1 are components of the Notch signalling pathway. EMBO Rep. 2011 May;12(5):428-35. doi: 10.1038/embor.2011.49. Epub 2011 Apr 8. PMID:21475249 doi:10.1038/embor.2011.49
↑ de Chiara C, Menon RP, Kelly G, Pastore A. Protein-protein interactions as a strategy towards protein-specific drug design: the example of ataxin-1. PLoS One. 2013 Oct 14;8(10):e76456. doi: 10.1371/journal.pone.0076456. PMID:24155902 doi:http://dx.doi.org/10.1371/journal.pone.0076456

1 Structural highlights
2 Disease
3 Function
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2m41"

@@ Line 5: / Line 5: @@
 </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1oa8|1oa8]], [[1v06|1v06]]</td></tr>
 <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ATXN1, ATX1, SCA1 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</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=2m41 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2m41 OCA], [http://www.rcsb.org/pdb/explore.do?structureId=2m41 RCSB], [http://www.ebi.ac.uk/pdbsum/2m41 PDBsum]</span></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=2m41 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2m41 OCA], [http://pdbe.org/2m41 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2m41 RCSB], [http://www.ebi.ac.uk/pdbsum/2m41 PDBsum]</span></td></tr>
 </table>
 == Disease ==
@@ Line 19: / Line 19: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 2m41" style="background-color:#fffaf0;"></div>
 == References ==
 <references/>

2m41

From Proteopedia

Revision as of 00:13, 11 September 2015

Solution Structure of the AXH domain of Ataxin-1 in complex with ligand peptide from Capicua

Structural highlights

Disease

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox