Nucleic Acids Research, Vol 27, Issue 3 750-755, Copyright © 1999 by Oxford University Press
T Ohbayashi, Y Makino and Ta Tamura
TATA-binding protein (TBP) is an essential factor for eukaryotic
transcription. In this study, we demonstrated a mouse cDNA encoding a 21
kDa TBP-like protein (TLP). The TLP ORF, carrying 186 amino acids, covered
the entire 180 amino acids of the C-terminal conserved domain of mouse TBP
with 39% identity and 76% similarity. Northern blot analysis demonstrated
that TLP mRNAs were expressed in various mammalian tissues ubiquitously and
that their distribution pattern was analogous to that of TBP. By using
anti-TLP antibody, we demonstrated the existence of TLP proteins in various
mammalian cells and tissues. The Drosophila TBP-related factor (TRF) is a
neurogenesis-related transcription factor that binds to the TATA-box and
activates transcription. TLP did not bind to the TATA-box nor direct
transcription initiation. Multiple amino acids critical for TBP function
were deleted or substituted in TLP, while amino acids in Drosophila TRF
much resembled those in TBP. Similarity between Drosophila TRF and mouse
TLP was considerably lower (alignment score 35) than that between
Drosophila TBP and mouse TBP (alignment score 88). Identity of nucleotide
sequences between mouse and putative human TLPs (94%) was higher than that
between TBPs (91%) in these two animals. Expression of TLP was nearly
constant throughout the P19 differentiation process. Accordingly, we
suggest that, even if higher eukaryotes generally contain multiple tbp
-related genes, TLP is not a bona fide mammalian counterpart of Drosophila
TRF.
ARTICLES
Identification of a mouse TBP-like protein (TLP) distantly related to the drosophila TBP-related factor
Department of Biology, Faculty of Science, Chiba University and CREST Japan Science and Technology Corporation, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
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