Nucleic Acids Research, Vol 26, Issue 24 5562-5567, Copyright © 1998 by Oxford University Press
JJ Eloranta, A Kato, MS Teng and RO Weinzierl
Archaeal RNA polymerases (RNAPs) resemble the eukaryotic nuclear RNAPs in
complexity, and many of their subunits display a high degree of sequence
similarity to their eukaryotic counterparts. Here we describe specific
protein-protein contacts present between individual recombinant RNAP
subunits from the archaeon Methanococcus jannaschii. Subunits D and L
interact specifically with each other in two-hybrid assays. D also
interacts under the same conditions with the RPB11 and AC19 subunits from
the yeast Saccharomyces cerevisiae, suggesting that essential elements of
the binding surface between these proteins have been conserved across the
archaeal/eukaryotic evolutionary domain boundary. Interactions between L
and RPB3 or AC40 were, however, not detectable. Recombinant D and L
subunits associate under in vitro conditions and copurify with each other
during size-exclusion chromatography. Addition of an another recombinant
subunit (N) to the D- L complex results in the formation of a triple
complex. This D-L-N complex resembles the RPB3-RPB11-RPB10 or
AC40-AC19-RPB10 complexes in eukaryotic RNAPIIand RNAPI/RNAPIII,
respectively. Our data provide evidence for a close similarity in the
quaternary arrangement of a subset of archaeal and eukaryotic RNA
polymerase subunits and the conservation of the protein-protein contacts
formed between them.
ARTICLES
In vitro assembly of an archaeal D-L-N RNA polymerase subunit complex reveals a eukaryote-like structural arrangement
Department of Biochemistry, Imperial College of Science, Technology and Medicine, Exhibition Road, London SW7 2AY, UK.
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