PMID: 9192675Jun 24, 1997Paper

Homo- and heterodimeric interactions between the gene products of PKD1 and PKD2

Proceedings of the National Academy of Sciences of the United States of America
L TsiokasGerd Walz

Abstract

PKD1 and PKD2 are two recently identified genes that are responsible for the vast majority of autosomal polycystic kidney disease, a common inherited disease that causes progressive renal failure. PKD1 encodes polycystin, a large glycoprotein that contains several extracellular motifs indicative of a role in cell-cell or cell-matrix interactions, and the PKD2 encodes a protein with homology to a voltage-activated calcium channel and to PKD1. It is currently unknown how mutations of either protein functionally cause autosomal polycystic kidney disease. We show that PKD1 and PKD2 interact through their C-terminal cytoplasmic tails. This interaction resulted in an up-regulation of PKD1 but not PKD2. Furthermore, the cytoplasmic tail of PKD2 but not PKD1 formed homodimers through a coiled-coil domain distinct from the region required for interaction with PKD1. These interactions suggest that PKD1 and PKD2 may function through a common signaling pathway that is necessary for normal tubulogenesis and that PKD1 may require the presence of PKD2 for stable expression.

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