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描述:
TNF RI (also known as the p60 or p55 TNFR) and TNF RII (the p75 or p80 TNFR)
are two distinct type I transmembrane glycoproteins that bind TNF with
highaffinity. Both RI and RII are prototypic members of the TNF receptor
superfamily and have been designated TNFRSF1A and TNFRSF1B, respectively.
The extracellular domains of both receptors contain four conserved cysteinerich
domains while their intracellular domains are dissimilar, indicative of distinct
signaling pathways. Human TNF RII cDNA encodes a 461 amino acid (aa) residue
precursor protein with a 22 aa putative signal peptide, a 235 aa extracellular domain,
a 20 aa transmembrane domain and a 174 aa cytoplasmic domain. Whereas all cell
types studied express TNF RI, TNF RII expression is limited primarily to hematopoietic
cells and cells of the immune system. Most of the biological functions of TNF are
mediated via TNF RI. Soluble forms of both TNF RI and TNF RII, generated as a result
of proteolytic cleavage of the extracellular domains, have been detected in vivo in
various biological fluids. The soluble TNF receptors can bind TNF with high affinity
and function as TNF antagonists.
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