Overview
Lamin is a type of intermediate filament protein that forms the nuclear lamina, a dense fibrillar network lining the inner nuclear membrane. It is essential for maintaining nuclear structure, chromatin organization, and mechanical stability. Lamins are classified into A-type (LMNA) and B-type (LMNB1/LMNB2), with distinct roles in cellular processes. Mutations in lamin genes are linked to laminopathies, a group of disorders including Hutchinson-Gilford progeria syndrome and Emery-Dreifuss muscular dystrophy. Research on lamin has expanded our understanding of nuclear mechanics and aging-related diseases.
Physical and Chemical Properties
Lamins are fibrous proteins with a molecular weight ranging from 60 to 70 kDa, depending on the subtype. They possess a conserved central α-helical rod domain, which facilitates polymerization into higher-order structures. The proteins are soluble in buffers containing detergents like SDS but form insoluble networks in vivo. Post-translational modifications, such as farnesylation, are critical for lamin function and localization. These modifications influence the protein's interaction with nuclear membranes and other structural components. The stability of lamins under physiological conditions makes them resistant to degradation, contributing to their long half-life in cells.
Main Applications
Lamins are widely used in cell biology research to study nuclear architecture, mechanotransduction, and gene regulation. They serve as biomarkers for cellular senescence and are employed in disease models, particularly for laminopathies. Recombinant lamin proteins are utilized in vitro to reconstitute nuclear lamina structures. In biotechnology, lamin-derived peptides are explored for drug delivery systems due to their nuclear targeting capabilities. The protein's role in aging has also spurred interest in anti-aging therapies, with lamin expression modulation being a potential therapeutic strategy.
Safety and Storage
Lamin proteins require careful handling to maintain integrity. Store lyophilized or solution forms at -20°C, avoiding repeated freeze-thaw cycles. Use sterile techniques when handling lamin for cell culture applications to prevent contamination. While lamins are non-toxic, standard laboratory safety protocols should be followed, including the use of gloves and eye protection. Waste disposal should comply with institutional guidelines for biological materials.
B2B Procurement Guide
When procuring lamin proteins, specify the subtype (A, B, or C) and purity level (e.g., >90% for research). Reputable suppliers provide certificates of analysis detailing endotoxin levels and biological activity. Bulk purchases may require custom production; lead times vary. For cost efficiency, consider recombinant lamin produced in E. coli or mammalian systems, depending on application needs. Prices range from $200 to $500 per mg, with discounts available for bulk orders. Verify supplier compliance with ISO 13485 for clinical-grade lamin.
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