Linked Life Data

48887BiochemicalReaction3124

Source:http://www.reactome.org/biopax/48887BiochemicalReaction3124

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Authored: Garapati, P V, 2011-07-11, Edited: Garapati, P V, 2011-07-11, Reviewed: Rönnstrand, L, 2011-08-22, Two human isoforms of KIT have been identified, resulting from alternative splicing. They are characterized by the presence or absence of a tetrapeptide sequence (GNNK 510-513 aa) in the extracellular part of the juxtamembrane region and designated GNNK+ (Kit) or GNNK- (KitA) (Piao et al. 1994). The isoforms are co-expressed in most tisuues, with the GNNK- form predominating (Reith et al. 1991). No difference in ligand affinity was observed (Caruana et al. 1999). <br>KIT belongs to the type III tyrosine kinase receptor family, with five extracellular immunoglobulin (Ig)-like domains, a single transmembrane region, an inhibitory cytoplasmic juxtamembrane domain, and a split cytoplasmic kinase domain separated by a kinase insert segment and a cytoplasmic tail (Mol et al. 2003). <br>Signaling by KIT occurs following SCF binding. SCF homodimers binds to the first three Ig-like domains of KIT in the regions between aa L104-D122 and R146-D153 (Mendiaz et al. 1996, Matous et al. 1996) which leads to dimerization which is further stabilized by Ig-like domains 3-4 (Yuzawa et al., 2007).
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Interaction of KIT and sSCF
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