Words similar to nucleocytoplasmic
Example sentences for: nucleocytoplasmic
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AtCOP1 contains three conserved structural domains: a RING finger at the amino terminus, a coiled-coil domain in the middle, and a carboxyl-terminal WD40 repeat domain [ 9 10 ] . Each of the three conserved domains has been shown to mediate protein-protein interactions [ 11 12 13 ] . The subcellular localization of AtCOP1 is regulated by light in a tissue specific manner [ 14 15 ] . The hypocotyl cell nuclei contain high levels of COP1 in the dark and reduced levels in the light, suggesting that the nucleocytoplasmic partitioning of AtCOP1 is adjusted by a light-responsive mechanism [ 14 16 ] . The activity of AtCOP1 is at least in part regulated by its subcellular localization, as the degradation of HY5 is dependent upon the nuclear accumulation of AtCOP1 in the dark [ 4 ] . AtCOP1 was demonstrated to carry a single, bipartite nuclear localization signal located between the coiled-coil domain and the WD-40 domain (amino acid 294-314) and a cytoplasmic localization signal, which was mapped to a region partially overlapping with the RING finger and the coiled-coil domain (amino acid 67-117) [ 17 ] . Strikingly, AtCOP1 protein forms characteristic nuclear speckles when transiently expressed in onion epidermal cells or stably expressed in transgenic Arabidopsis [ 6 18 ] . The functional role of these speckles is currently unknown; however, a subnuclear localization signal consisting of 58 residues (amino acid 120-177) is required for their formation [ 19 ] .
Other tab mutants (such as tab3, TAB5, CDC14 TAB 6and TAB7 ) showed no defect in this assay, suggesting that bypass of cdc15Δ can be achieved without perturbing nucleocytoplasmic transport.
Multiple tabmutations influence nucleocytoplasmic transport
One attractive hypothesis based on our identification of MTR10 as a tab gene is that MEN proteins regulate the nucleocytoplasmic distribution of a key regulator of the release process.
The subcellular localization of AtCOP1 is regulated by light [ 14 ] , a feature that is critical for its function [ 4 29 ] . Interestingly, the localization of mammalian COP1 protein expressed in plant cells can also be regulated by light [ 20 ] , implicating a similar mechanism may operate for the nucleocytoplasmic partitioning of COP1 in mammalian cells.
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