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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Nucleic+Acids+Res
2015 ; 43
(13
): 6285-98
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TBP-like protein (TLP) interferes with Taspase1-mediated processing of TFIIA and
represses TATA box gene expression
#MMPMID26038314
Suzuki H
; Isogai M
; Maeda R
; Ura K
; Tamura TA
Nucleic Acids Res
2015[Jul]; 43
(13
): 6285-98
PMID26038314
show ga
TBP-TFIIA interaction is involved in the potentiation of TATA box-driven
promoters. TFIIA activates transcription through stabilization of TATA box-bound
TBP. The precursor of TFIIA is subjected to Taspase1-directed processing to
generate ? and ? subunits. Although this processing has been assumed to be
required for the promoter activation function of TFIIA, little is known about how
the processing is regulated. In this study, we found that TBP-like protein (TLP),
which has the highest affinity to TFIIA among known proteins, affects
Taspase1-driven processing of TFIIA. TLP interfered with TFIIA processing in vivo
and in vitro, and direct binding of TLP to TFIIA was essential for inhibition of
the processing. We also showed that TATA box promoters are specifically
potentiated by processed TFIIA. Processed TFIIA, but not unprocessed TFIIA,
associated with the TATA box. In a TLP-knocked-down condition, not only the
amounts of TATA box-bound TFIIA but also those of chromatin-bound TBP were
significantly increased, resulting in the stimulation of TATA box-mediated gene
expression. Consequently, we suggest that TLP works as a negative regulator of
the TFIIA processing and represses TFIIA-governed and TATA-dependent gene
expression through preventing TFIIA maturation.