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Of the atypical PKCs, Par-4 and p62: recent understandings of the biology and pathology of a PB1-dominated complex Moscat J; Diaz-Meco MT; Wooten MWCell Death Differ 2009[Nov]; 16 (11): 1426-37The recent identification of a novel protein-protein interaction module, termed PB1, in critical signaling molecules such as p62 (also known as sequestosome1), the atypical PKCs, and Par-6, has unveiled the existence of a new set of signaling complexes, which can be central to several biological processes from development to cancer. In this review, we will discuss the most recent advances on the role that the different components of these complexes have in vivo and that are relevant to human disease. In particular, we will review what we are learning from new data from knockout mice, and the indications from human mutations on the real role of these proteins in the physiology and biology of human diseases. The role that PKCzeta, PKClambda/iota, and Par-4 have in lung and prostate cancer in vivo and in humans will be extensively covered in this article, as will the multifunctional role of p62 as a novel hub in cell signaling during cancer and inflammation, and the mechanistic details and controversial data published on its potential role in aggregate formation and signaling. All this published information is shedding new light on the proposed pathological implications of these PB1-regulators in disease and shows their important role in cell physiology.|Adaptor Proteins, Signal Transducing/genetics/*metabolism[MESH]|Animals[MESH]|Apoptosis Regulatory Proteins/genetics/*metabolism[MESH]|Humans[MESH]|Mice[MESH]|Protein Interaction Domains and Motifs[MESH]|Protein Kinase C/genetics/*metabolism[MESH]|Sequestosome-1 Protein[MESH]|Tumor Suppressor Proteins/metabolism[MESH] |
