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Inhibition of nuclear protein import by a monoclonal antibody against a novel class of nuclear pore proteins

Pandey, S and Karande, AA and Mishra, K and Parnaik, VK (1994) Inhibition of nuclear protein import by a monoclonal antibody against a novel class of nuclear pore proteins. In: Experimental cell research, 212 (2). 243 -254 .

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Official URL: http://dx.doi.org/10.1006/excr.1994.1140


Nuclear import of proteins is mediated by the nuclear pore complexes in the nuclear envelope and requires the presence of a nuclear localization signal (NLS) on the karyophilic protein. In this paper, we describe studies with a monoclonal antibody, Mab E2, which recognizes a class of nuclear pore proteins of 60-76 kDa with a common phosphorylated epitope on rat nuclear envelopes. The Mab Ea-reactive proteins fractionated with the relatively insoluble pore complex-containing component of the envelope and gave a finely punctate pattern of nuclear staining in immunofluorescence assays. The antibody did not bind to any cytosolic proteins. Mab E2 inhibited the interaction of a simian virus 40 large T antigen NLS peptide with a specific 60-kDa NLS-binding protein from rat nuclear envelopes in photoaffinity labeling experiments. The antibody blocked the nuclear import of NLS-albumin conjugates in an in vitro nuclear transport assay with digitonin-permeabilized cells, but did not affect passive diffusion of a small nonnuclear protein, lysozyme, across the pore. Mab E2 may inhibit protein transport by directly interacting with the 60-kDa NLS-binding protein, thereby blocking signal-mediated nuclear import across the nuclear pore complex. (C) 1994 Academic Press, Inc.

Item Type: Journal Article
Publication: Experimental cell research
Publisher: Elsevier Science
Additional Information: Copyright of this article belongs to Elsevier Science.
Department/Centre: Division of Biological Sciences > Biochemistry
Date Deposited: 24 May 2011 08:19
Last Modified: 24 May 2011 08:19
URI: http://eprints.iisc.ac.in/id/eprint/36552

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