Abstract:
:Understanding receptor activation is important for disease intervention. Activation of the receptor tyrosine kinase c-KIT is involved in numerous diseases including melanoma, mastocytosis, multiple myeloma and gastrointestinal stromal tumors. To better understand the regulation of activation, we studied the two c-KIT isoforms, c-KIT(-) and c-KIT(+), which differ by a tetrapeptide insert GNNK, located in the extracellular juxtamembrane domain of the c-KIT(+) isoform. This region is important for regulating receptor activation. Here we show that the consecutive elimination of one amino acid at a time from the GNNK tetrapeptide insert gradually increases receptor tyrosine phosphorylation, ubiquitination, internalization and downstream MAP kinase-ERK activation. Successively decreasing the insert length progressively improves cell survival during drug treatment. Our results indicate that the length of the tetrapeptide fine-tunes receptor activity, thus providing deeper insight into c-KIT activation.
journal_name
Cell Signaljournal_title
Cellular signallingauthors
Phung B,Steingrímsson E,Rönnstrand Ldoi
10.1016/j.cellsig.2013.07.011subject
Has Abstractpub_date
2013-11-01 00:00:00pages
2231-8issue
11eissn
0898-6568issn
1873-3913pii
S0898-6568(13)00209-Xjournal_volume
25pub_type
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