The MAN antigens are non-lamin constituents of the nuclear lamina in vertebrate cells |
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Authors: | Micheline Paulin-Levasseur Deborah Lyn Blake Martha Julien Louise Rouleau |
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Affiliation: | (1) Department of Biology, University of Ottawa, 30 Marie Curie, K1N 6N5 Ottawa, Ontario, Canada;(2) Present address: Centre hospitalier St-Joseph de Trois-Rivières, 731 Ste-Julie, G9A 1Y1 Trois-Rivières, Québec, Canada |
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Abstract: | The characterization of the human antiserum designated MAN has led to the identification of a subset of non-lamin proteins that are exclusively located at the nuclear periphery in all vertebrate cell types examined, from human to fish. Immunoreactive protein species were whown to comprise three major polypeptides of Mr 78000, 58000 and 40000. These antigens co-partitioned with the nuclear lamina during in situ isolation of nuclear matrices from lamin A/C-positive and-negative mammlian cells. Using double immunofluorescence, the spatial relationship of MAN antigens to type-A and type-B lamins was further examined throughout the cell cycle of lamin A/C-positive mammalian cells. In interphase HeLa and 3t3 cells, MAN antigens colocalized with both types of lamins at the periphery of the nucleus, but were absent from intranuclear foci of lamin B. As HeLa cells proceeded into mitosis, MAN antigens were seen to segregate from lamins A/C and coredistribute with lamin B. Lamins A/C disassembled during late prophase/early prometaphase and reassociated with chromatin in telophase/cytokinesis. In contrast, MAN antigens and lamin B dispersed late during prometaphase and reassembled on chromosomes in anaphase. Altogether, our data suggest that MAN antigens may play key functions in the maintenance of the structural integrity of the nuclear compartment in vertebrate cells. |
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