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Molecular and Cellular Biology, January 2000, p. 340-351, Vol. 20, No. 1
Institut de Génétique et de
Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, Illkirch
Cédex, C.U. de Strasbourg, France
Received 22 July 1999/Returned for modification 17 September
1999/Accepted 28 September 1999
It has been previously proposed that the transcription complexes
TFIID and SAGA comprise a histone octamer-like substructure formed from
a heterotetramer of H4-like human hTAFII80 (or its Drosophila melanogaster dTAFII60 and yeast
[Saccharomyces cerevisiae] yTAFII60
homologues) and H3-like hTAFII31 (dTAFII40 and
yTAFII17) along with two homodimers of H2B-like
hTAFII20 (dTAFII30
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The Human TFIID Components TAFII135 and
TAFII20 and the Yeast SAGA Components ADA1 and
TAFII68 Heterodimerize to Form Histone-Like Pairs
and yTAFII61/68). However, it has not been formally shown that
hTAFII20 heterodimerizes via its histone fold. By
two-hybrid analysis with yeast and biochemical characterization of
complexes formed by coexpression in Escherichia coli, we
showed that hTAFII20 does not homodimerize but
heterodimerizes with hTAFII135. Heterodimerization requires
the
2 and
3 helices of the hTAFII20 histone fold and is abolished by mutations in the hydrophobic face of the
hTAFII20
2 helix. Interaction with hTAFII20
requires a domain of hTAFII135 which shows sequence
homology to H2A. This domain also shows homology to the yeast SAGA
component ADA1, and we show that yADA1 heterodimerizes with the histone
fold region of yTAFII61/68, the yeast hTAFII20 homologue. These results are indicative of a histone fold type of
interaction between hTAFII20-hTAFII135 and
yTAFII68-yADA1, which therefore constitute novel
histone-like pairs in the TFIID and SAGA complexes.
*
Corresponding author. Mailing address: Institut de
Génétique et de Biologie Moléculaire et Cellulaire,
CNRS/INSERM/ULP, B.P. 163-67404, Illkirch Cédex, C.U. de
Strasbourg, France. Phone: 33 3 88 65 34 40 (45). Fax: 33 3 88 65 32 01. E-mail: irwin{at}titus.u-strasbg.fr.
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