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. 1991 May 1;88(9):3812–3816. doi: 10.1073/pnas.88.9.3812

Protein kinase A- and protein kinase C-regulated interaction of plectin with lamin B and vimentin.

R Foisner 1, P Traub 1, G Wiche 1
PMCID: PMC51543  PMID: 2023931

Abstract

Solid-phase binding assays with protein species purified from cultured rat glioma C6 cells and Ehrlich ascites revealed that plectin bound specifically to lamin B but not to lamins A and C. Lamin B interaction was significantly decreased upon in vitro phosphorylation of either lamin B or plectin with protein kinase A or C. In contrast, phosphorylation of plectin with kinase A increased its binding to vimentin, suggesting a different regulation of plectin interactions by this kinase. 32P-radiolabeling of rat glioma C6 cells revealed plectin as a major in vivo target of protein kinase A and protein kinase C. Plectin, present in lysates of dibutyryladenosine 3',5'-cyclic monophosphate-treated cells, showed a 2.5 times higher binding affinity to vimentin than plectin from phorbol ester-treated cells. Furthermore, the relative amounts of plectin in 1% Triton X-100/high salt-insoluble cell fractions decreased to one-fourth of control values upon treating cells with phorbol esters, whereas vimentin was unaffected. This finding suggested a protein kinase C-dependent weakening of plectin interaction with intermediate filaments in vivo. Taken together, these results point to a role of plectin in interlinking cytoskeletal and nuclear elements and suggest that specific protein kinases are involved in regulating these interactions.

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