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Human La Is Found at RNA Polymerase III-Transcribed Genes in vivo
Jennifer A. Fairley, Theodoros Kantidakis, Niall S. Kenneth, Robert V. Intine, Richard J. Maraia, Robert J. White and Mark T. Groudine
Proceedings of the National Academy of Sciences of the United States of America
Vol. 102, No. 51, Enzymatic Rescue of Myelination (Dec. 20, 2005), pp. 18350-18355
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/4152620
Page Count: 6
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The human La autoantigen can bind to nascent RNA transcripts and has also been postulated to act as an RNA polymerase III (pol III) transcription initiation and termination factor. Here, we show by chromatin immunoprecipitation (ChIP) that La is associated with pol Ill-transcribed genes in vivo. In contrast, the Ro autoantigen, which can also bind pol III transcripts, is not found at these genes. The putative pol III transcription factors NF1 and TFIIA are also not detected at class III genes. Binding of La remains when transcription is repressed at mitosis and does not correlate with the presence of polymerase at the gene. However, gene occupancy depends on the phosphorylation status of La, with the less prevalent, unphosphorylated form being found selectively on pol III templates.
Proceedings of the National Academy of Sciences of the United States of America © 2005 National Academy of Sciences