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[摘要]：SAF-A/hnRNP-U is an abundant nuclear protein that interacts specifically with nuclear matrix attachment region DNA (MAR) and RNA as a component of hnRNPs. SAF-A/hnRNP-U was also shown to specifically bind mouse major satellite DNA (satMa). Antibodies against SAF-A and GFP-fusion constructs were used in the current work in order to trace SAF-A localization. In accordance with its diverse nucleic acid binding specificity, SAF-A was found to be localized in three different domains: outside the chromosomes, on the surface of the chromosome arms (probably MARs), and in the centromere region where it apparently binds specifically to the satMa. GFP-fusion constructs with different SAF-A/hnRNP-U domains confirms the functional significance of the protein's functional domains in interphase cells. In telophase cells, the anti-SAF-A antibody signal appeared as a kind of network covering unfolded chromosomes. Copyright (C) 2009 S. Karger AG, Basel |
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