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- W1994621035 abstract "U3 RNA, a capped small nuclear RNA found thus far only in the nucleolus, has been implicated in the processing and/or transport of preribosomal RNA [Busch, H., Reddy, R., Rothblum, L., & Choi, Y. C. (1982) Annu. Rev. Biochem. 51, 617-654]. Tris(hydroxymethyl)aminomethane (Tris) (10 mM, pH 7.0) extracts of Novikoff hepatoma nucleoli, which contained about 80% of total nucleolar U3 RNA, were analyzed by sucrose density gradient centrifugation. Approximately 65% of the U3 RNA was bound to greater than 60S preribosomal ribonucleoprotein (RNP) particles, and about 15% sedimented at less than 20 S. The association between the 65% of U3 RNA that was bound to the preribosomal RNP particles was stable up to 55 degrees C. About 10% of U3 RNA was base paired to preribosomal RNA after deproteinization at 22 degrees C. The base-paired fraction of U3 RNA was released from the preribosomal RNA by heating to 45 degrees C or treating with 4 M urea. These results show that of the total nucleolar U3 RNP, (a) about 55% is bound to preribosomal RNP particles primarily by protein interactions, (b) about 10% is base paired to preribosomal RNA, (c) approximately 15% sedimented slowly and consisted presumably of free U3 RNP particles, and (d) the remaining 20% of U3 RNP was not extractable using 10 mM Tris buffer. On the basis of the different association states of U3 RNP particles, a model is proposed for the binding and dissociation events which take place between U3 RNP and preribosomal RNP particles." @default.
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- W1994621035 date "1984-11-01" @default.
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- W1994621035 title "Multiple states of U3 RNA in Novikoff hepatoma nucleoli" @default.
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- W1994621035 doi "https://doi.org/10.1021/bi00318a007" @default.
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