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• W2060158352 abstract "Translocation from the cytosol to the nucleus is a major response by calmodulin (CaM) to stimulation of cells by Ca2+. However, the mechanisms involved in this process are still controversial and both passive and facilitated diffusion have been put forward. We tested nuclear translocation mechanisms in electroporated HeLa cells, rat cortical neurons and glial cells using novel calmodulin and inhibitor peptide probes and confocal microscopy. Passive diffusion of calmodulin across the nuclear membrane was measured in conditions in which facilitated transport was blocked and was compared to that of a similarly sized fluorescein-labeled dextran. Wheat germ agglutinin, which blocks facilitated transport but not passive diffusion, inhibited the nuclear entry of both wild-type and Ca2+-binding-deficient mutant calmodulin both in low and elevated [Ca2+]. Ca2+-dependent nuclear translocation was prevented by a membrane-permeant CaM inhibitor, the mTrp peptide, which indicated that it was specific to Ca2+/CaM. Diffusion of free CaM and Ca2+/CaM was considerably slower than the observed nuclear translocation by facilitated transport. Our data show that the majority of CaM nuclear entry occurred by facilitated mechanisms in all cell types examined, in part by a Ca2+-independent and in part by a Ca2+-dependent translocation mechanism." @default.
• W2060158352 created "2016-06-24" @default.
• W2060158352 creator A5022263599 @default.
• W2060158352 creator A5041688511 @default.
• W2060158352 date "2004-11-15" @default.
• W2060158352 modified "2023-09-23" @default.
• W2060158352 title "Ca2+-dependent and -independent mechanisms of calmodulin nuclear translocation" @default.
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• W2060158352 doi "https://doi.org/10.1242/jcs.01510" @default.
• W2060158352 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15522886" @default.
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