PDBsum entry 4mjs

Transferase/protein binding

PDB id: 4mjs

Contents

Protein chains

(+ 6 more) 88 a.a.

82 a.a.

84 a.a.

87 a.a.

Ligands

EDO ×4

Waters ×397

References listed in PDB file

Key reference

• Title: Structural and biochemical insights into the homotypic pb1-Pb1 complex between pkcζ and p62.
• Authors: J.Ren, J.Wang, Z.Wang, J.Wu.
• Ref.: Sci China Life Sci, 2014, 57, 69-80. [DOI no: 10.1007/s11427-013-4592-z]
• PubMed id: 24369353

Abstract

The atypical PKC isoforms (ζ and ı) play essential roles in regulating various cellular processes. Both the hetero-interaction between PKCζ and p62 through their N-terminal PB1 domains and the homo-oligomerization of p62 via its PB1 domain are critical for the activation of NF-κB signaling; however, the molecular mechanisms concerning the formation and regulation of these homotypic complexes remain unclear. Here we determined the crystal structure of PKCζ-PB1 in complex with a monomeric p62-PB1 mutant, where the massive electrostatic interactions between the acidic OPCA motif of PKCζ-PB1 and the basic surface of p62-PB1, as well as additional hydrogen bonds, ensure the formation of a stable and specific complex. The PKCζ-p62 interaction is interfered with the modification of a specific Cys of PKCζ by the antiarthritis drug aurothiomalate, though all four cysteine residues in the PKCζ-PB1 domain can be modified in in vitro assay. In addition, detailed structural and biochemical analyses demonstrate that the PB1 domains of aPKCs belong to the type I group, which can depolymerize the high-molecular-weight p62 aggregates into homo-oligomers of lower order. These data together unravel the molecular mechanisms of the homo-or hetero-interactions between p62 and PKCζ and provide the basis for designing inhibitors of NF-κB signaling.