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Molecular and Cellular Biology, March 2000, p. 1639-1648, Vol. 20, No. 5
Institut de Génétique et de
Biologie Moléculaire et Cellulaire, CNRS/INSERM/ULP, F-67404
Illkirch Cedex, CU de Strasbourg,1 and
INSERM U.384, 63001 Clermont Ferrand
Cedex,4 France; Institute of Gene
Biology, Russian Academy of Sciences,2 and
University of Oslo, Center of Medical
Studies,3 Moscow, Russia; Department of
Development Genetics, Deutsches Krebsforschungszentrum, D-69120
Heidelberg, Germany5; and Drosophila
Stock Center, School of Life Sciences, Devi Ahilya, Vishwavidyala,
Vigyan Bhawan, Indore 452-001, India6
Received 26 July 1999/Returned for modification 31 August
1999/Accepted 18 November 1999
TFIID is a multiprotein complex composed of the TATA binding
protein (TBP) and TBP-associated factors (TAFIIs). The
binding of TFIID to the promoter is the first step of RNA polymerase II preinitiation complex assembly on protein-coding genes. Yeast (y) and
human (h) TFIID complexes contain 10 to 13 TAFIIs.
Biochemical studies suggested that the Drosophila (d) TFIID
complexes contain only eight TAFIIs, leaving a number of
yeast and human TAFIIs (e.g., hTAFII55,
hTAFII30, and hTAFII18) without known
Drosophila homologues. We demonstrate that
Drosophila has not one but two hTAFII30
homologues, dTAFII16 and dTAFII24, which are
encoded by two adjacent genes. These two genes are localized in a
head-to-head orientation, and their 5' extremities overlap. We show
that these novel dTAFIIs are expressed and that they are
both associated with TBP and other bona fide dTAFIIs in
dTFIID complexes. dTAFII24, but not dTAFII16,
was also found to be associated with the histone acetyltransferase
(HAT) dGCN5. Thus, dTAFII16 and dTAFII24 are functional homologues of hTAFII30, and this is the first
demonstration that a TAFII-GCN5-HAT complex exists in
Drosophila. The two dTAFIIs are differentially
expressed during embryogenesis and can be detected in both nuclei and
cytoplasm of the cells. These results together indicate that
dTAFII16 and dTAFII24 may have similar but not
identical functions.
0270-7306/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Two Novel Drosophila TAFIIs Have Homology
with Human TAFII30 and Are Differentially Regulated
during Development
*
Corresponding author. Mailing address: Institut de
Génétique et de Biologie Moléculaire et Cellulaire,
CNRS/INSERM/ULP, BP 163, F67404 Illkirch Cedex, CU de Strasbourg,
France. Phone: 33 388 65 34 44. Fax: 33 388 65 32 01. E-mail:
laszlo{at}igbmc.u-strasbg.fr.
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