{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nStudies indicate that the protein in focus plays a dual role in muscle cell function. Its structural functions are highlighted by its specific localization at the Z‐line of sarcomeres, where a conserved motif (the ZASP-like motif) and a PDZ domain mediate two distinct interactions with α‐actinin isoforms. These interactions not only stabilize the structure of the Z-disc—by aligning the α‐actinin rod and C-terminal regions—but also ensure the proper mechanical integrity of muscle fibers."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to structural stabilization, the protein is critical for myogenic differentiation. Functional interference with its expression leads to reduced levels of key transcription factors, including MyoD and myogenin. This disruption impairs differentiation, an effect that is linked to compromised actin filament bundling and subsequent down‐regulation of serum response factor (SRF) activity. Restoration of actin stability, however, can rescue the differentiation process, thereby placing the protein upstream of MyoD and underscoring its role in cytoskeletal regulation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nFurther biochemical and cellular analyses reveal isoform-specific nuances in function. Structural studies have shown that an otherwise unfolded internal region can be stabilized—facilitating detailed backbone mapping—which suggests a dynamic regulatory role in protein interactions. Moreover, one isoform (smALP) exhibits a shift from the cytoplasm to the nucleus during the myoblast differentiation process, a translocation that is dependent on its LIM domain. This nuclear relocation hints at additional roles beyond mechanical stabilization, potentially contributing to nuclear signaling events in muscle development."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": ""}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Tuula Klaavuniemi, Annina Kelloniemi, Jari Ylänne "}, {"type": "b", "children": [{"type": "t", "text": "The ZASP-like motif in actinin-associated LIM protein is required for interaction with the alpha-actinin rod and for targeting to the muscle Z-line."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2004)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M401871200"}], "href": "https://doi.org/10.1074/jbc.M401871200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15084604"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15084604"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Pascal Pomiès, Mohammad Pashmforoush, Cristina Vegezzi, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The cytoskeleton-associated PDZ-LIM protein, ALP, acts on serum response factor activity to regulate muscle differentiation."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Mol Biol Cell (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1091/mbc.e06-09-0815"}], "href": "https://doi.org/10.1091/mbc.e06-09-0815"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17332502"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17332502"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Nanna Alho, Tuula Klaavuniemi, Jari Ylänne, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Backbone NMR assignment of the internal interaction site of ALP."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biomol NMR Assign (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1007/s12104-007-9024-1"}], "href": "https://doi.org/10.1007/s12104-007-9024-1"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "19636834"}], "href": "https://pubmed.ncbi.nlm.nih.gov/19636834"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Linda Cambier, Pascal Pomiès "}, {"type": "b", "children": [{"type": "t", "text": "Nuclear translocation of the cytoskeleton-associated protein, smALP, upon induction of skeletal muscle differentiation."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biochem Biophys Res Commun (2011)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.bbrc.2011.05.054"}], "href": "https://doi.org/10.1016/j.bbrc.2011.05.054"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "21620799"}], "href": "https://pubmed.ncbi.nlm.nih.gov/21620799"}]}]}]}