Editing Partitioning Defective 3 Homolog B(PARD3B)

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Summary	The cell polarity protein PAR3, conserved from the nematode to the vertebrate, forms a complex with PAR6 and atypical protein kinase C (aPKC), and the protein complex occurs at the tight junctions in mammalian epithelial cells. The encoded protein of 1,205 amino acids contains a region homologous to the aPKC-binding domain of PAR3alpha, another human homologue previously identified, and three PDZ domains; the first PDZ domain of PAR3alpha is considered to interact with PAR6. Unexpectedly, in contrast to other PAR3s found in various species, PAR3beta is incapable of binding to any isotypes of PAR6 or aPKC. Nevertheless PAR3beta, expressed intrinsically or extrinsically, localizes to the tight junctions, indicating that the localization does not require the ternary complex formation.
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