BIOSYNTHESIS OF SMALL NUCLEAR RNAS IN HUMAN-CELLS
BIOSYNTHESIS OF SMALL NUCLEAR RNAS IN HUMAN-CELLS
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DOI：
10.1002/jcp.1041170206
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发表时间：
1983-01-01
影响因子：
5.6
通讯作者：
ELICEIRI, GL
中科院分区：
文献类型：
--
作者：
CHANDRASEKHARAPPA, SC;SMITH, JH;ELICEIRI, GL
Some aspects of the biosynthesis of human small nuclear RNA (snRNA) were examined. The sensitivity of U5 and U4 snRNA synthesis to .alpha.-amanitin in whole cells suggests that RNA polymerase II is involved in the synthesis of these RNA species, in addition to that of U1, U2 and U3 snRNA. Two RNA bands were detected, whose properties are compatible with being U3 and U4 RNA precursors. The cytoplasmic U1 RNA precursor (pU1) was retained by an anti-RNP [ribonucleoprotein] antibody column, while the cytoplasmic precursors to U1 and U2 (pU2) RNA were immunoprecipitated by monoclonal anti-Sm antibodies. Soon after their transcription, these cytoplasmic RNA precursors assemble with the polypeptides which bear the RNP (pU1) and Sm (pU1 and pU2) antigenic determinants. Shortly after protein synthesis is interrupted, the apparent cytoplasmic .fwdarw. nuclear transition of newly made U2 RNA is inhibited, while U2 RNA transcription is not. The trimming of the U2 RNA precursor to mature U2 RNA is apparently not affected early after suppression of protein synthesis.
