ID:DMD_HUMAN DESCRIPTION: RecName: Full=Dystrophin; FUNCTION: Anchors the extracellular matrix to the cytoskeleton via F-actin. Ligand for dystroglycan. Component of the dystrophin- associated glycoprotein complex which accumulates at the neuromuscular junction (NMJ) and at a variety of synapses in the peripheral and central nervous systems and has a structural function in stabilizing the sarcolemma. Also implicated in signaling events and synaptic transmission. SUBUNIT: Interacts with SYNM (By similarity). Interacts with the syntrophins SNTA1, SNTB1, SNTB2, SNTG1 and SNTG2. Interacts with KRT19. Component of the dystrophin-associated glycoprotein complex which is composed of three subcomplexes: a cytoplasmic complex comprised of DMD (or UTRN), DTNA and a number of syntrophins, such as SNTB1, SNTB2, SNTG1 and SNTG2, the transmembrane dystroglycan complex, and the sarcoglycan-sarcospan complex. Interacts with DAG1 (betaDAG1) with DMD; the interaction is inhibited by phosphorylation on the PPXY motif of DAG1. Interacts with CMYA5 (By similarity). Directly interacts with ANK2 and ANK3; these interactions do not interfere with betaDAG1-binding and are necessary for proper localization in muscle cells (By similarity). INTERACTION: Q01484:ANK2; NbExp=2; IntAct=EBI-1018651, EBI-941975; Q3T1J5:Ank3 (xeno); NbExp=2; IntAct=EBI-1018651, EBI-2133962; P08727:KRT19; NbExp=2; IntAct=EBI-295827, EBI-742756; Q13884:SNTB1; NbExp=3; IntAct=EBI-295827, EBI-295843; SUBCELLULAR LOCATION: Cell membrane, sarcolemma; Peripheral membrane protein; Cytoplasmic side. Cytoplasm, cytoskeleton. Cell junction, synapse, postsynaptic cell membrane (By similarity). Note=In muscle cells, sarcolemma localization requires the presence of ANK2, while localization to costameres requires the presence of ANK3. Localizes to neuromuscular junctions (NMJs) in the presence of ANK2 (By similarity). TISSUE SPECIFICITY: Expressed in muscle fibers accumulating in the costameres of myoplasm at the sarcolemma. Expressed in brain, muscle, kidney, lung and testis. Isoform 5 is expressed in heart, brain, liver, testis and hepatoma cells. Most tissues contain transcripts of multiple isoforms, however only isoform 5 is detected in heart and liver. DISEASE: Defects in DMD are the cause of Duchenne muscular dystrophy (DMD) [MIM:310200]. DMD is the most common form of muscular dystrophy; a sex-linked recessive disorder. It typically presents in boys aged 3 to 7 year as proximal muscle weakness causing waddling gait, toe-walking, lordosis, frequent falls, and difficulty in standing up and climbing up stairs. The pelvic girdle is affected first, then the shoulder girdle. Progression is steady and most patients are confined to a wheelchair by age of 10 or 12. Flexion contractures and scoliosis ultimately occur. About 50% of patients have a lower IQ than their genetic expectations would suggest. There is no treatment. DISEASE: Defects in DMD are the cause of Becker muscular dystrophy (BMD) [MIM:300376]. BMD resembles DMD in hereditary and clinical features but is later in onset and more benign. DISEASE: Defects in DMD are a cause of cardiomyopathy dilated X- linked type 3B (CMD3B) [MIM:302045]; also known as X-linked dilated cardiomyopathy (XLCM). 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. MISCELLANEOUS: The DMD gene is the largest known gene in humans. It is 2.4 million base-pairs in size, comprises 79 exons and takes over 16 hours to be transcribed and cotranscriptionally spliced. SIMILARITY: Contains 2 CH (calponin-homology) domains. SIMILARITY: Contains 24 spectrin repeats. SIMILARITY: Contains 1 WW domain. SIMILARITY: Contains 1 ZZ-type zinc finger. WEB RESOURCE: Name=DMD; Note=Dystrophin Mutation Database; URL="http://www.dmd.nl/database.html"; WEB RESOURCE: Name=GeneReviews; URL="http://www.ncbi.nlm.nih.gov/sites/GeneTests/lab/gene/DMD"; WEB RESOURCE: Name=SHMPD; Note=The Singapore human mutation and polymorphism database; URL="http://shmpd.bii.a-star.edu.sg/gene.php?genestart=A&genename=DMD"; WEB RESOURCE: Name=Wikipedia; Note=Dystrophin entry; URL="http://en.wikipedia.org/wiki/Dystrophin";
ModBase Predicted Comparative 3D Structure on P11532
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