Plastins are a family of actin-binding proteins that are conserved throughout eukaryote evolution and expressed in most tissues of higher eukaryotes. In humans, two ubiquitous plastin isoforms (L and T) have been identified. Plastin 1 (otherwise known as Fimbrin) is a third distinct plastin isoform which is specifically expressed at high levels in the small intestine. The L isoform is expressed only in hemopoietic cell lineages, while the T isoform has been found in all other normal cells of solid tissues that have replicative potential (fibroblasts, endothelial cells, epithelial cells, melanocytes, etc.). The C-terminal 570 amino acids of the T-plastin and L-plastin proteins are 83% identical. It contains a potential calcium-binding site near the N-terminus.[2]
Clinical significance
Defects in PLS3 are associated with osteoporosis and bone fracture in humans and in knockout zebrafish.[3]
References
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Giganti A, Plastino J, Janji B, et al. (2005). "Actin-filament cross-linking protein T-plastin increases Arp2/3-mediated actin-based movement". J. Cell Sci. 118 (Pt 6): 1255–65. doi:10.1242/jcs.01698. PMID15741236.
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Ikeda H, Sasaki Y, Kobayashi T, et al. (2006). "The role of T-fimbrin in the response to DNA damage: silencing of T-fimbrin by small interfering RNA sensitizes human liver cancer cells to DNA-damaging agents". Int. J. Oncol. 27 (4): 933–40. doi:10.3892/ijo.27.4.933. PMID16142308.
