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All rights reserved. http://resource.belframework.org/belframework/20131211/knowledge/large_corpus.bel http://purl.org/dc/elements/1.1/title BEL Framework Large Corpus Document http://resource.belframework.org/belframework/20131211/knowledge/large_corpus.bel http://purl.org/pav/authoredBy http://www.tkuhn.ch/bel2nanopub/RAYRRgaS2YA9fj2u0-c1KwwprsaMSRbAzCzWvu4ionFRE#_6 http://resource.belframework.org/belframework/20131211/knowledge/large_corpus.bel http://purl.org/pav/version 20131211 http://www.tkuhn.ch/bel2nanopub/RAYRRgaS2YA9fj2u0-c1KwwprsaMSRbAzCzWvu4ionFRE#_5 http://www.w3.org/ns/prov#value TGF-B1 is the most abundant and universally expressed isoform; most studies have either examined or been performed with exogenous TGF-B1. TGF-B is secreted into the extracellular matrix as a latent protein complex bound to a latency- associated protein and one of the four isoforms of latent TGF-B binding protein. Activation of TGF-B, which is required for biologic activity, occurs through poorly understood mechanisms likely involving proteolytic processing of the associated proteins and release of the TGF-B ligand. Once activated, the TGF-B ligands regulate cellular processes by binding to three high-affinity cell surface receptors: the type I TGF-B receptor (TBRI), type II TGF-B receptor (TBRII), and type III TGF-B receptor (TBRIII, also referred to as betaglycan). Where expressed, TBRIII is the most abundant TGF-B receptor and classically functions by binding the TGF-B ligand and transferring it to its signaling receptors, TBRI and TBRII.12 TBRI and TBRII contain serine/threonine protein kinases in their intracellular domains. TBRI initiates intracellular signaling by phosphorylating a family of transcription factors, the Smads. Smad2 and Smad3 are the receptor-activated Smads for TGF-B because they are phosphorylated by TBRI. Smad4 is a common partner for all of the receptor-activated Smads. Smad6 and Smad7 are inhibitory Smads that block the phosphorylation of Smad2 or Smad3, thus inhibiting TGF-B signaling. A general mechanism for TGF-B signaling has been elucidated (Fig 1).13,14 The TGF-B ligand either binds to TBRIII, which presents TGF-B to TBRII, or binds to TBRII directly. Once bound to TGF-B, TBRII recruits, binds, and transphosphorylates TBRI, thereby stimulating its protein kinase activity. The activated TBRI phosphorylates Smad2 or Smad3, which binds to Smad4. 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