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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
Stable URL: http://www.jstor.org/stable/4152620
Page Count: 6
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Human La Is Found at RNA Polymerase III-Transcribed Genes in
              vivo
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Abstract

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.

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