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Muscle LIM protein (MLP) is a small protein consisting of 194 amino acids. It is specifically expressed in skeletal and cardiac muscles. MLP is a key regulator of striated muscle physiology and pathophysiology and has been implicated in muscle pathogenesis. It interacts with a large array of proteins within the sarcomere, including alpha-actinin and telethonin/T-Cap. MLP is also involved in the regulation of muscle function and has been shown to influence gene expression. It has been identified as a potential therapeutic strategy for promoting nerve repair.
| Characteristics | Values |
|---|---|
| Type | Muscle-specific protein |
| Size | Relatively small protein of 194 amino acids |
| Function | Key regulator of striated muscle physiology and pathophysiology |
| Gene | Encoded by CSRP3, a member of the cysteine-rich protein (CRP) family |
| Structure | Belongs to the LIM-only domain family with two LIM domains and a glycine-rich domain |
| Role in Skeletal Muscle | Plays a role in stress transduction, fiber-type transformation, and response to injury |
| Role in Cardiac Muscle | Upregulated in eccentric contraction-induced muscle injury, potential regulator of gene expression |
| Interactions | Binds with alpha-actinin, gamma-catenin, beta-spectrin, N-RAP, and myosin-binding protein C |
| Therapeutic Potential | MLP-mediated effects on actin could be a strategy for promoting nerve repair |
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What You'll Learn
Muscle LIM protein (MLP) is a regulator of striated muscle physiology and pathophysiology
Muscle LIM protein (MLP) is a relatively small protein of 194 amino acids that is specifically expressed in skeletal and cardiac muscles. Structurally, it belongs to the LIM-only domain family, a large protein family with diverse functional roles, including transcriptional regulation, cell fate determination, cell adhesion, motility, cytoskeleton organization, and signal transduction. MLP has two LIM domains, each followed by a glycine-rich domain. These LIM domains can act as independent units, mediating interactions with various proteins at different subcellular locations, including the cytoplasm and the nucleus.
MLP has emerged as a key regulator of striated muscle physiology and pathophysiology. It is implicated in myogenic differentiation and myocyte cytoarchitecture, with experimental evidence suggesting its involvement in both processes. MLP also interacts with a range of proteins within the sarcomere, such as α-actinin and telethonin/T-Cap, and may influence titin, the protein responsible for passive tension in cardiac and skeletal muscle.
The diverse functional roles of MLP have a significant impact on cardiac and skeletal muscle physiology and pathology. Mutations in the gene encoding MLP, cysteine and glycine-rich protein 3 (CSRP3), are associated with human cardiomyopathies, while altered expression patterns are observed in human failing hearts and skeletal myopathies. MLP has been shown to be upregulated in response to eccentric contraction (EC)-induced muscle injury, and its absence results in compromised recovery in MLP-knockout mice.
MLP also has a role in axon regeneration, as observed in adult rat retinal ganglion cells (RGCs) upon axotomy. Its expression is correlated with the ability to regenerate injured axons, and specific knockdown of MLP in RGCs impairs this process. Additionally, MLP acts as an actin cross-linker, facilitating filopodia formation and increasing growth cone motility, which could be a potential therapeutic strategy for promoting nerve repair.
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MLP is a small protein of 194 amino acids
Muscle Lim Protein (MLP) is a small protein of 194 amino acids. It is specifically expressed in skeletal and cardiac muscles. MLP is encoded by the cysteine and glycine-rich protein 3 (CSRP3) gene, which is a member of the cysteine-rich protein (CRP) family. CRP1 and CRP2 are prominent in smooth muscle, while CSRP3 is expressed in striated muscle.
MLP belongs to the LIM-only domain family, a large protein family with diverse functional roles. These roles include transcriptional regulation, cell fate determination, cell adhesion, motility, cytoskeleton organization, and signal transduction. Structurally, MLP contains one or more LIM domains, which are characterized by two zinc finger domains with 8 conserved cysteine and histidine residues that bind two zinc ions.
The critical role of MLP in striated muscle function is evident by the major implications of its absence or aberrant function. Mutations in the CSRP3 gene and altered expression patterns have been associated with human cardiomyopathies and skeletal myopathies. Investigations into MLP's functional significance in striated muscle have intensified due to its implication in muscle pathogenesis.
MLP has also been identified as a stress sensor in the heart, and its deficiency can lead to myocardial hypertrophy, dilated cardiomyopathy, and heart failure. MLP is further involved in myogenic differentiation and myocyte cytoarchitecture, although the full scope of its intracellular roles is still being explored.
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MLP is expressed in skeletal and cardiac muscles
Muscle LIM protein (MLP) is a small protein consisting of 194 amino acids. It is specifically expressed in skeletal and cardiac muscles. Structurally, it belongs to a family of proteins that contain one or more LIM domains. The name of this protein domain was derived from the initial letters of Lin-11, Isl1 and Mec-3, the first three members of this protein family to be identified. LIM domains comprise approximately 50-60 amino acids and share two characteristic zinc finger domains. These zinc fingers contain eight highly conserved cysteine and histidine residues at specific positions, which coordinately bind two zinc ions.
MLP is encoded by the CSRP3 gene, which was first identified in 1994 during a rat cDNA library screen. It belongs to the LIM-only domain family, a large protein family with diverse functional roles, including transcriptional regulation, cell fate determination, cell adhesion and motility, cytoskeleton organization, and signal transduction. MLP has been shown to interact with a vast number of different proteins at different subcellular locations, including the cytoplasm and the nucleus.
MLP has emerged as a key regulator of striated muscle physiology and pathophysiology. It is implicated in both myogenic differentiation and myocyte cytoarchitecture. Mutations in the CSRP3 gene have been associated with dilated (DCM) and hypertrophic (HCM) cardiomyopathies, while altered MLP levels have been observed in human failing hearts and various skeletal myopathies.
The generation of a mouse model lacking MLP (MLP−/−) demonstrated the essential role of this protein in mammalian striated muscle. Both skeletal and cardiac muscles were affected by MLP deficiency, but the defects were most severe in the cardiac muscles. MLP knockout animals have also been shown to develop dilated cardiomyopathy, illustrating its importance in maintaining cardiac function.
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MLP is implicated in muscle pathogenesis
Muscle LIM protein (MLP) is a small protein of 194 amino acids that is specifically expressed in skeletal and cardiac muscles. It is encoded by the cysteine and glycine-rich protein 3 (CSRP3) gene, which belongs to the cysteine-rich protein (CRP) family. MLP is a key regulator of striated muscle physiology and pathophysiology, with diverse functional roles, including transcriptional regulation, cell fate determination, cell adhesion, motility, cytoskeleton organization, and signal transduction.
The MLP/MyBP-C complex is critical during early myoblast differentiation, and its absence or aberrant expression may contribute to the development of cardiac and skeletal myopathies. MLP interacts with a range of proteins, including actin, alpha-actinin, beta-spectrin, and N-RAP, and its nuclear localization suggests a role in transcription. MLP oligomerization, or the formation of dimers, trimers, and tetramers, is believed to be crucial for its cellular localization and function, impacting muscle physiology.
Furthermore, MLP has been detected at the level of sarcomeres, intercalated discs, and costameres in the cytoplasm, and it interacts with various proteins in these subcellular locations. MLP's structural characteristics, such as its two independent LIM domains, facilitate the formation of macromolecular complexes and mediate interactions with numerous proteins. Overall, MLP's diverse functional roles have significant implications for cardiac and skeletal muscle physiology and pathology, making it an important focus of investigation in muscle pathogenesis research.
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MLP is involved in the maintenance of normal muscle function
Muscle LIM protein (MLP) is a muscle-specific protein that plays a crucial role in maintaining normal muscle function. It is a relatively small protein, consisting of 194 amino acids, and is specifically expressed in skeletal and cardiac muscles. MLP has been implicated in both muscle cell differentiation and the maintenance of muscle cytoarchitecture, with a significant impact on cardiac and skeletal muscle physiology and pathology.
MLP belongs to the LIM-only domain family, a large group of proteins with diverse functional roles, including transcriptional regulation, cell fate determination, cell adhesion, motility, cytoskeleton organization, and signal transduction. The two MLP LIM domains mediate interactions with various proteins at different subcellular locations, including the cytoplasm and the nucleus. MLP interacts with proteins such as actin, alpha-actinin, beta-spectrin, and N-RAP, and its oligomerization potential is believed to be critical for its cellular localization and function.
MLP is involved in myocyte differentiation by activating transcription factors such as MyoD, myogenin, and MRF4. It controls the autophagic process by associating with LC3 in the cytosol, regulating the recycling of organelles and proteins. MLP is also implicated in the maintenance of slow muscle fibers, as its upregulation is observed during fast-to-slow fiber-type transitions. Additionally, MLP plays a role in the early stages of the skeletal muscle recovery process after injury, serving both structural and gene-regulatory roles.
Studies have shown that MLP deficiency leads to myocardial hypertrophy, dilated cardiomyopathy, and heart failure. MLP mutations are associated with hypertrophic and dilated cardiomyopathy in humans. MLP is also down-regulated in individuals with heart failure, further highlighting its importance in maintaining normal cardiac function. While MLP's role in skeletal muscle is less understood, it is associated with changes in cardiac or skeletal passive stiffness, and MLP-deficient animals exhibit mild skeletal muscle pathology.
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Frequently asked questions
Muscle LIM Protein (MLP) is a protein with multiple functional roles in striated muscle physiology and pathophysiology. It is specifically expressed in skeletal and cardiac muscles.
MLP has been shown to play a role in stress transduction across muscle cells and is an important mediator of mechanical stress in cardiac tissue. It is also involved in myogenic differentiation and myocyte cytoarchitecture.
MLP is a small protein of 194 amino acids. It belongs to the LIM-only domain family, which is a large protein family with diverse functional roles, including transcriptional regulation and cell adhesion. The name of the LIM protein domain comes from the initial letters of Lin-11, Isl1, and Mec-3, the first three members of this protein family.
