共查询到20条相似文献,搜索用时 15 毫秒
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Identification of four nuclear transport signal-binding proteins that interact with diverse transport signals. 总被引:32,自引:1,他引:32 下载免费PDF全文
The transport of proteins into the nucleus requires not only the presence of a nuclear transport signal on the targeted protein but also the signal recognition proteins and the nuclear pore translocation apparatus. Complicating the search for the signal recognition proteins is the fact that the nuclear transport signals identified share little obvious homology. In this study, synthetic peptides homologous to the nuclear transport signals from the simian virus 40 large T antigen, Xenopus oocyte nucleoplasmin, adenovirus E1A, and Saccharomyces cerevisiae MAT alpha 2 proteins were coupled to a UV-photoactivable cross-linker and iodinated for use in an in vitro cross-linking reaction with cellular lysates. Four proteins, p140, p100, p70, and p55, which specifically interacted with the nuclear transport signal peptides were identified. Unique patterns of reactivity were observed with closely related pairs of nuclear transport signal peptides. Competition experiments with labeled and unlabeled peptides demonstrated that heterologous signals were able to bind the same protein and suggested that diverse signals use a common transport pathway. The subcellular distribution of the four nuclear transport signal-binding proteins suggested that nuclear transport involves both cytoplasmic and nuclear receptors. The four proteins were not bound by wheat germ agglutinin and were not associated tightly with the nuclear pore complex. 相似文献
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Identification of three sequence-specific DNA-binding proteins which interact with the Rous sarcoma virus enhancer and upstream promoter elements. 总被引:13,自引:8,他引:5 下载免费PDF全文
G H Goodwin 《Journal of virology》1988,62(6):2186-2190
Three avian nuclear proteins which bind to the Rous sarcoma virus long terminal repeat have been detected. Two of the proteins bind to sequences within the enhancer, and the third protein binds to a sequence spanning the enhancer and an upstream promoter region. 相似文献
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Binding of nuclear proteins to promoter elements of the mouse alpha A-crystallin gene 总被引:10,自引:0,他引:10
B Sommer A B Chepelinsky J Piatigorsky 《The Journal of biological chemistry》1988,263(30):15666-15672
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