Differential activity of c-KIT splice forms is controlled by extracellular peptide insert length.

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 Signal

journal_title

Cellular signalling

authors

Phung B,Steingrímsson E,Rönnstrand L

doi

10.1016/j.cellsig.2013.07.011

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

2231-8

issue

11

eissn

0898-6568

issn

1873-3913

pii

S0898-6568(13)00209-X

journal_volume

25

pub_type

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