Identification of a basolateral sorting signal within the cytoplasmic domain of the interleukin-6 signal transducer gp130.

Abstract:

:Interleukin-6-type cytokine receptors are expressed in polarized cells such as hepatocytes and intestinal cells. For the interleukin-6-receptor gp80 and its signal transducer gp130, a preferential basolateral localization was demonstrated in Madin-Darby canine kidney (MDCK) cells and two basolateral sorting signals were identified within the cytoplasmic domain of gp80. The cytoplasmic tail of gp130 is responsible for signaling via the Janus kinase/signal transducer and activator of transcription pathway. In addition, it mediates the internalization of the receptor complex which is dependent on a di-leucine motif. Truncated gp130 lacking the cytoplasmic domain is sorted apically in MDCK cells. For identification of the basolateral sorting signal(s) of gp130, a series of deletion mutants in the cytoplasmic domain of gp130 have been generated and stably expressed in MDCK cells. Biotinylation analyses of these mutants show that a ten amino acids sequence between amino acids 782 and 792 which contains the di-leucine internalization motif is also essential for a basolateral sorting. Accordingly, we detect apical delivery of a gp130 mutant in which the di-leucine motif has been exchanged by two alanines (gp130LL/AA). These findings indicate that the di-leucine motif which directs the internalization of the IL-6 receptor complex also mediates the basolateral sorting of the signal transducer gp130.

journal_name

Cell Signal

journal_title

Cellular signalling

authors

Doumanov JA,Daubrawa M,Unden H,Graeve L

doi

10.1016/j.cellsig.2005.09.006

subject

Has Abstract

pub_date

2006-08-01 00:00:00

pages

1140-6

issue

8

eissn

0898-6568

issn

1873-3913

pii

S0898-6568(05)00240-8

journal_volume

18

pub_type

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