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Mol. Cell. Biol., Feb 1996, 593-602, Vol 16, No. 2
R Candau, PA Moore, L Wang, N Barlev, CY Ying, CA Rosen and SL Berger
Transcriptional adaptor proteins are required for full function of higher
eukaryotic acidic activators in the yeast Saccharomyces cerevisiae,
suggesting that this pathway of activation is evolutionarily conserved.
Consistent with this view, we have identified possible human homologs of
yeast ADA2 (yADA2) and yeast GCN5 (yGCN5), components of a putative adaptor
complex. While there is overall sequence similarity between the yeast and
human proteins, perhaps more significant is conservation of key sequence
features with other known adaptors. We show several functional similarities
between the human and yeast adaptors. First, as shown for yADA2 and yGCN5,
human ADA2 (hADA2) and human GCN5 (hGCN5) interacted in vivo in a yeast
two-hybrid assay. Moreover, hGCN5 interacted with yADA2 in this assay,
suggesting that the human proteins form similar complexes. Second, both
yADA2 and hADA2 contain cryptic activation domains. Third, hGCN5 and yGCN5
had similar stabilizing effects on yADA2 in vivo. Furthermore, the region
of yADA2 that interacted with yGCN5 mapped to the amino terminus of yADA2,
which is highly conserved in hADA2. Most striking, is the behavior of the
human proteins in human cells. First, GAL4-hADA2 activated transcription in
HeLa cells, and second, either hADA2 or hGCN5 augmented GAL4-VP16
activation. These data indicated that the human proteins correspond to
functional homologs of the yeast adaptors, suggesting that these cofactors
play a key role in transcriptional activation.
Copyright © 1996, American Society for Microbiology
Identification of human proteins functionally conserved with the yeast putative adaptors ADA2 and GCN5
Wistar Institute, Philadelphia, Pennsylvania 19104, USA.
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