7ahs: Difference between revisions

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 ==titin-N2A Ig81-Ig83==
-<StructureSection load='7ahs' size='340' side='right'caption='[[7ahs]]' scene=''>
+<StructureSection load='7ahs' size='340' side='right'caption='[[7ahs]], [[Resolution|resolution]] 2.05&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=7AHS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7AHS FirstGlance]. <br>
+<table><tr><td colspan='2'>[[7ahs]] 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=7AHS OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=7AHS 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=7ahs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7ahs OCA], [https://pdbe.org/7ahs PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7ahs RCSB], [https://www.ebi.ac.uk/pdbsum/7ahs PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7ahs 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]] 2.05&#8491;</td></tr>
+<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=SO4:SULFATE+ION'>SO4</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=7ahs FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=7ahs OCA], [https://pdbe.org/7ahs PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=7ahs RCSB], [https://www.ebi.ac.uk/pdbsum/7ahs PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=7ahs ProSAT]</span></td></tr>
 </table>
+== Disease ==
+[https://www.uniprot.org/uniprot/TITIN_HUMAN TITIN_HUMAN] Defects in TTN are the cause of hereditary myopathy with early respiratory failure (HMERF) [MIM:[https://omim.org/entry/603689 603689]; also known as Edstrom myopathy. HMERF is an autosomal dominant, adult-onset myopathy with early respiratory muscle involvement.<ref>PMID:15802564</ref>   Defects in TTN are the cause of familial hypertrophic cardiomyopathy type 9 (CMH9) [MIM:[https://omim.org/entry/613765 613765]. Familial hypertrophic cardiomyopathy is a hereditary heart disorder characterized by ventricular hypertrophy, which is usually asymmetric and often involves the interventricular septum. The symptoms include dyspnea, syncope, collapse, palpitations, and chest pain. They can be readily provoked by exercise. The disorder has inter- and intrafamilial variability ranging from benign to malignant forms with high risk of cardiac failure and sudden cardiac death.<ref>PMID:10462489</ref>   Defects in TTN are the cause of cardiomyopathy dilated type 1G (CMD1G) [MIM:[https://omim.org/entry/604145 604145]. Dilated cardiomyopathy is a disorder characterized by ventricular dilation and impaired systolic function, resulting in congestive heart failure and arrhythmia. Patients are at risk of premature death.<ref>PMID:11846417</ref> <ref>PMID:11788824</ref> <ref>PMID:16465475</ref>   Defects in TTN are the cause of tardive tibial muscular dystrophy (TMD) [MIM:[https://omim.org/entry/600334 600334]; also known as Udd myopathy. TMD is an autosomal dominant, late-onset distal myopathy. Muscle weakness and atrophy are usually confined to the anterior compartment of the lower leg, in particular the tibialis anterior muscle. Clinical symptoms usually occur at age 35-45 years or much later.<ref>PMID:12145747</ref> <ref>PMID:12891679</ref>   Defects in TTN are the cause of limb-girdle muscular dystrophy type 2J (LGMD2J) [MIM:[https://omim.org/entry/608807 608807]. LGMD2J is an autosomal recessive degenerative myopathy characterized by progressive weakness of the pelvic and shoulder girdle muscles. Severe disability is observed within 20 years of onset.  Defects in TTN are the cause of early-onset myopathy with fatal cardiomyopathy (EOMFC) [MIM:[https://omim.org/entry/611705 611705]. Early-onset myopathies are inherited muscle disorders that manifest typically from birth or infancy with hypotonia, muscle weakness, and delayed motor development. EOMFC is a titinopathy that, in contrast with the previously described examples, involves both heart and skeletal muscle, has a congenital onset, and is purely recessive. This phenotype is due to homozygous out-of-frame TTN deletions, which lead to a total absence of titin's C-terminal end from striated muscles and to secondary CAPN3 depletion.<ref>PMID:17444505</ref>
+== Function ==
+[https://www.uniprot.org/uniprot/TITIN_HUMAN TITIN_HUMAN] Key component in the assembly and functioning of vertebrate striated muscles. By providing connections at the level of individual microfilaments, it contributes to the fine balance of forces between the two halves of the sarcomere. The size and extensibility of the cross-links are the main determinants of sarcomere extensibility properties of muscle. In non-muscle cells, seems to play a role in chromosome condensation and chromosome segregation during mitosis. Might link the lamina network to chromatin or nuclear actin, or both during interphase.<ref>PMID:9804419</ref>
+<div style="background-color:#fffaf0;">
+== Publication Abstract from PubMed ==
+The N2A segment of titin is a main signaling hub in the sarcomeric I-band that recruits various signaling factors and processing enzymes. It has also been proposed to play a role in force production through its Ca2+-regulated association with actin. However, the molecular basis by which N2A performs these functions selectively within the repetitive and extensive titin chain remains poorly understood. Here, we analyze the structure of N2A components and their association with F-actin. Specifically, we characterized the structure of its Ig domains by elucidating the atomic structure of the I81-I83 tandem using x-ray crystallography and computing a homology model for I80. Structural data revealed these domains to present heterogeneous and divergent Ig folds, where I81 and I83 have unique loop structures. Notably, the I81-I83 tandem has a distinct rotational chain arrangement that confers it a unique multi-domain topography. However, we could not identify specific Ca2+-binding sites in these Ig domains, nor evidence of the association of titin N2A components with F-actin in transfected C2C12 myoblasts or C2C12-derived myotubes. In addition, F-actin cosedimentation assays failed to reveal binding to N2A. We conclude that N2A has a unique architecture that predictably supports its selective recruitment of binding partners in signaling, but that its mechanical role through interaction with F-actin awaits validation.
+The N2A region of titin has a unique structural configuration.,Stronczek C, Lange S, Bullard B, Wolniak S, Borgeson E, Mayans O, Fleming JR J Gen Physiol. 2021 Jul 5;153(7). pii: 211969. doi: 10.1085/jgp.202012766. PMID:33836065<ref>PMID:33836065</ref>
+From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
+</div>
+<div class="pdbe-citations 7ahs" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Titin 3D structures|Titin 3D structures]]
+== References ==
+<references/>
 __TOC__
 </StructureSection>
+[[Category: Homo sapiens]]
 [[Category: Large Structures]]
 [[Category: Fleming JR]]
 [[Category: Mayans O]]