2WWM

Crystal structure of the Titin M10-Obscurin like 1 Ig complex in space group P1

2WWM の概要

• エントリーDOI: 10.2210/pdb2wwm/pdb
• 関連するPDBエントリー: 1BPV 1G1C 1NCT 1NCU 1TIT 1TIU 1TKI 1TNM 1TNN 1WAA 1YA5 2A38 2BK8 2CPC 2F8V 2J8H 2J8O 2WP3 2WWK
• 分子名称: OBSCURIN-LIKE PROTEIN 1, TITIN (3 entities in total)
• 機能のキーワード: transferase-structural protein complex, sarcomere, tpr repeat, immunoglobulin domain, limb-girdle muscular dystrophy, serine/threonine-protein kinase, transferase, cardiomyopathy, calmodulin-binding, nucleotide-binding, transferase/structural protein
• 由来する生物種: HOMO SAPIENS (HUMAN); 詳細
• 細胞内の位置: Cytoplasm (Probable): 2WWM
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 44213.70

構造登録者

Pernigo, S.,Fukuzawa, A.,Gautel, M.,Steiner, R.A. (登録日: 2009-10-26, 公開日: 2010-02-16, 最終更新日: 2023-12-20)

主引用文献

Pernigo, S.,Fukuzawa, A.,Bertz, M.,Holt, M.,Rief, M.,Steiner, R.A.,Gautel, M.
Structural Insight Into M-Band Assembly and Mechanics from the Titin-Obscurin-Like-1 Complex.
Proc.Natl.Acad.Sci.USA, 107:2908-, 2010

PubMed Abstract: In the sarcomeric M-band, the giant ruler proteins titin and obscurin, its small homologue obscurin-like-1 (obsl1), and the myosin cross-linking protein myomesin form a ternary complex that is crucial for the function of the M-band as a mechanical link. Mutations in the last titin immunoglobulin (Ig) domain M10, which interacts with the N-terminal Ig-domains of obscurin and obsl1, lead to hereditary muscle diseases. The M10 domain is unusual not only in that it is a frequent target of disease-linked mutations, but also in that it is the only currently known muscle Ig-domain that interacts with two ligands--obscurin and obsl1--in different sarcomeric subregions. Using x-ray crystallography, we show the structural basis for titin M10 interaction with obsl1 in a novel antiparallel Ig-Ig architecture and unravel the molecular basis of titin-M10 linked myopathies. The severity of these pathologies correlates with the disruption of the titin-obsl1/obscurin complex. Conserved signature residues at the interface account for differences in affinity that direct the cellular sorting in cardiomyocytes. By engineering the interface signature residues of obsl1 to obscurin, and vice versa, their affinity for titin can be modulated similar to the native proteins. In single-molecule force-spectroscopy experiments, both complexes yield at forces of around 30 pN, much lower than those observed for the mechanically stable Z-disk complex of titin and telethonin, suggesting why even moderate weakening of the obsl1/obscurin-titin links has severe consequences for normal muscle functions.

PubMed: 20133654
DOI: 10.1073/PNAS.0913736107

実験手法

X-RAY DIFFRACTION (2.3 Å)