RNA Polymerases and the Eukaryotic Transcription Machinery


RNA polymerase and its associated proteins play a central role in human gene regulation. This transcription machinery is poised to sense and respond to the multiplicity of cellular signals designed to customize synthesis of both the amount and type of RNA based on the specialized needs of cells comprising human tissues.

Keywords: transcription; RNA polymerase; subunit; Mediator; elongation; chromatin

Figure 1.

Evolutionary conservation of ribonucleic acid polymerases (RNAPs). Relative subunit sizes are approximate; ‘human’ represents all metazoan RNAP subunits, yeast (S. cerevisiae) represents lower eukaryotic RNAP subunits. The bacterial subunit composition represents that used under normal culture conditions. The eukaryotic subunit nomenclature originated from yeast RNAP.

Figure 2.

RNA polymerase II C‐terminal domain (CTD). Each square box represents one CTD heptapeptide; the filled rectangles (not drawn to scale) represent RNAP II large subunit amino acids in front of the CTD. The consensus sequence shown represents the most prevalent repeated sequence in the overall CTD. A one‐ or two‐amino‐acid deviation from the consensus sequence is also common. The length of the yeast CTD shows strain variability: it can comprise either 26 or 27 repeats.

Figure 3.

RNAP II transcription machinery. All sizes are approximate. Subunit and transcription factor placement in the respective complexes is not intended to reflect known interactions. Adapted from Woychik and Hampsey .

Figure 4.

Yeast and human Mediator complexes. Subunits of yeast Mediator are grouped and listed by name, not by apparent molecular weight. The example used for human Mediator is the Srb‐ and Med‐containing cofactor complex–thyroid receptor‐associated protein complex (SMCC/TRAP); subunit names reflect apparent molecular weight. Evolutionary conservation exists between twelve subunits in the two complexes; each related pair is linked by a line (subunit similarities adapted from Malik and Roeder ; Boube et al.).



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Further Reading

Buratowski S (2000) Snapshots of RNA polymerase II transcription initiation. Current Opinion in Cell Biology 12: 320–325.

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Lee TI and Young RA (2000) Transcription of eukaryotic protein‐coding genes. Annual Review of Genetics 34: 77–137.

Meisterernst M (2002) Transcription. Mediator meets Morpheus. Science 295: 984–985.

Orphanides G and Reinberg D (2000) RNA polymerase II elongation through chromatin. Nature 407: 471–475.

Orphanides G and Reinberg D (2002) A unified theory of gene expression. Cell 108: 439–451.

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Woychik, Nancy A(Sep 2005) RNA Polymerases and the Eukaryotic Transcription Machinery. In: eLS. John Wiley & Sons Ltd, Chichester. http://www.els.net [doi: 10.1038/npg.els.0005059]