Determinants that control the specific interactions between TAB1 and p38alpha.

Molecular and Cellular Biology
Huamin ZhouJiahuai Han

Abstract

Previous studies have revealed that transforming growth factor-beta-activated protein kinase 1 (TAB1) interacts with p38alpha and induces p38alpha autophosphorylation. Here, we examine the sequence requirements in TAB1 and p38alpha that drive their interaction. Deletion and point mutations in TAB1 reveal that a proline residue in the C terminus of TAB1 (Pro412) is necessary for its interaction with p38alpha. Furthermore, a cryptic D-domain-like docking site was identified adjacent to the N terminus of Pro412, putting Pro412 in the phi(B)+3 position of the docking site. Through mutational analysis, we found that the previously identified hydrophobic docking groove in p38alpha is involved in this interaction, whereas the CD domain and ED domain are not. Furthermore, chimeric analysis with p38beta (which does not bind to TAB1) revealed a previously unidentified locus of p38alpha comprising Thr218 and Ile275 that is essential for specific binding of p38alpha to TAB1. Converting either of these residues to the corresponding amino acid of p38beta abolishes p38alpha interaction with TAB1. These p38alpha mutants still can be fully activated by p38alpha upstream activating kinase mitogen-activated protein kinase kinase 6, but their basa...Continue Reading

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