KazrinE is a desmosome-associated liprin that colocalises with acetylated microtubules
KazrinE is a desmosome-associated liprin that colocalises with acetylated microtubules
Kazrin is a widely expressed, evolutionarily conserved cytoplasmic protein that binds the cytolinker protein periplakin. Multiple functions of kazrin have been reported, including regulation of desmosome assembly, embryonic tissue morphogenesis and epidermal differentiation. Here, we identify kazrinE as a kazrin isoform that contains a liprin-homology domain (LHD) and forms complexes with kazrinA, kazrinB and kazrinC. As predicted from the presence of the LHD, kazrinE can associate with the leukocyte common antigen-related (LAR) protein tyrosine phosphatase in a phosphorylation-dependent manner. When overexpressed in epidermal keratinocytes, kazrinE induces changes in cell shape and stimulates terminal differentiation. Like the other kazrin isoforms, kazrinE localises to the nucleus and desmosomes. However, in addition, kazrinE associates with stabilised microtubules via its LHD. During terminal differentiation, the keratinocyte microtubule network undergoes extensive reorganisation; in differentiating keratinocytes, endogenous kazrinE colocalises with microtubules, but periplakin does not. We speculate that the kazrinE-microtubule interaction contributes to the mechanism by which kazrin regulates desmosome formation and epidermal differentiation.
- University of Cambridge United Kingdom
- National Cancer Research Institute United Kingdom
- King's College London United Kingdom
- Cancer Research UK Cambridge Center United Kingdom
- Kings College London, University of London United Kingdom
Keratinocytes, 570, Amino Acid Motifs, Receptor-Like Protein Tyrosine Phosphatases, Sequence Homology, 610, Microtubules, Cell Line, Mice, Protein Isoforms, Animals, Humans, Cell Shape, Adaptor Proteins, Signal Transducing, Cell Nucleus, Plakins, Signal Transducing, Intracellular Signaling Peptides and Proteins, Adaptor Proteins, Class 4, Membrane Proteins, Acetylation, Cell Differentiation, Desmosomes, LAR, Amino Acid, Cytoskeletal Proteins, Epidermal Cells, Epidermis, Carrier Proteins, Liprins
Keratinocytes, 570, Amino Acid Motifs, Receptor-Like Protein Tyrosine Phosphatases, Sequence Homology, 610, Microtubules, Cell Line, Mice, Protein Isoforms, Animals, Humans, Cell Shape, Adaptor Proteins, Signal Transducing, Cell Nucleus, Plakins, Signal Transducing, Intracellular Signaling Peptides and Proteins, Adaptor Proteins, Class 4, Membrane Proteins, Acetylation, Cell Differentiation, Desmosomes, LAR, Amino Acid, Cytoskeletal Proteins, Epidermal Cells, Epidermis, Carrier Proteins, Liprins
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