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Science 10 July 1998:
Vol. 281. no. 5374, pp. 262 - 266
DOI: 10.1126/science.281.5374.262
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Reports

Structure of the Escherichia coli RNA Polymerase alpha  Subunit Amino-Terminal Domain

Gongyi Zhang, Seth A. Darst *

The 2.5 angstrom resolution x-ray crystal structure of the Escherichia coli RNA polymerase (RNAP) alpha  subunit amino-terminal domain (alpha NTD), which is necessary and sufficient to dimerize and assemble the other RNAP subunits into a transcriptionally active enzyme and contains all of the sequence elements conserved among eukaryotic alpha  homologs, has been determined. The alpha NTD monomer comprises two distinct, flexibly linked domains, only one of which participates in the dimer interface. In the alpha NTD dimer, a pair of helices from one monomer interact with the cognate helices of the other to form an extensive hydrophobic core. All of the determinants for interactions with the other RNAP subunits lie on one face of the alpha NTD dimer. Sequence alignments, combined with secondary-structure predictions, support proposals that a heterodimer of the eukaryotic RNAP subunits related to Saccharomyces cerevisiae Rpb3 and Rpb11 plays the role of the alpha NTD dimer in prokaryotic RNAP.

Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.
*   To whom correspondence should be addressed. E-mail: darst{at}rockvax.rockefeller.edu

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