Protein kinase PKN1 associates with TRAF2 and is involved in TRAF2-NF-kappaB signaling pathway.

Abstract:

:PKN1 is a fatty acid and Rho-activated serine/threonine protein kinase whose catalytic domain is highly homologous to protein kinase C (PKC) family. In yeast two-hybrid screening for PKN1 binding proteins, we identified tumor necrosis factor alpha (TNFalpha) receptor-associated factor 2 (TRAF2). TRAF2 is one of the major mediators of TNF receptor superfamily transducing TNF signal to various functional targets, including activation of NF-kappaB, JNK, and apoptosis. FLAG-tagged PKN1 was co-immunoprecipitated with endogenous TRAF2 from HEK293 cell lysate, and in vitro binding assay using the deletion mutants of TRAF2 showed that PKN1 directly binds to the TRAF domain of TRAF2. PKN1 has the TRAF2-binding consensus sequences PXQX (S/T) at amino acid residues 580-584 (PIQES), and P580AQ582A mutant was not co-immunoprecipitated with TRAF2. Furthermore, the reduced expression of PKN1 by RNA interference (RNAi) down-regulated TRAF2-induced NF-kappaB activation in HEK293T cells. These results suggest that PKN1 is involved in TRAF2-NF-kappaB signaling pathway.

authors

Gotoh Y,Oishi K,Shibata H,Yamagiwa A,Isagawa T,Nishimura T,Goyama E,Takahashi M,Mukai H,Ono Y

doi

10.1016/j.bbrc.2003.12.148

subject

Has Abstract

pub_date

2004-02-13 00:00:00

pages

688-94

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006291X03027682

journal_volume

314

pub_type

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