Reference work entry
S100 Protein Family Members
S100A1, S100A2, S100A3, S100A4, S100A5, S100A6, S100A7, S100A8, S100A9, S100A10, S100A11, S100A12, S100A13, S100A14, S100A15, S100A16, S100B, S100P, S100G, S100Z, trichohyalin, filaggrin, filaggrin-2, cornulin, repetin
Historical Background/General: S100 Family
S100 proteins were first discovered in 1965 by Moore as a major protein fraction (0.6% of total soluble protein) isolated from bovine brain (Moore 1965). The protein was given the name S100 due to its high solubility in saturated ammonium sulfate. Later experiments showed the S100 protein fraction constituted two different dimeric species comprised of two β protomers (S100B) or an α,β heterodimer (Isobe et al. 1977). Early members of the S100 protein family were frequently given suffixes based on their localization or molecular size and included S100P (placental), S100C (cardiac or calgizzarin), p11 (11 kDa), and MRP8/MRP14 (myeloid regulatory proteins, 8 and 14...
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