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. 1993 Jun;13(6):3434–3444. doi: 10.1128/mcb.13.6.3434

Structure of the yeast TAP1 protein: dependence of transcription activation on the DNA context of the target gene.

T L Aldrich 1, G Di Segni 1, B L McConaughy 1, N J Keen 1, S Whelen 1, B D Hall 1
PMCID: PMC359812  PMID: 8497260

Abstract

Sequence data are presented for the Saccharomyces cerevisiae TAP1 gene and for a mutant allele, tap1-1, that activates transcription of the promoter-defective yeast SUP4 tRNA(Tyr) allele SUP4A53T61. The degree of in vivo activation of this allele by tap1-1 is strongly affected by the nature of the flanking DNA sequences at 5'-flanking DNA sequences as far away as 413 bp from the tRNA gene and by 3'-flanking sequences as well. We considered the possibility that this dependency is related to the nature of the chromatin assembled on these different flanking sequences. TAP1 encodes a protein 1,006 amino acids long. The tap1-1 mutation consists of a thymine-to-cytosine DNA change that changes amino acid 683 from tyrosine to histidine. Recently, Amberg et al. reported the cloning and sequencing of RAT1, a yeast gene identical to TAP1, by complementation of a mutant defect in poly(A) RNA export from the nucleus to the cytoplasm (D. C. Amberg, A. L. Goldstein, and C. N. Cole, Genes Dev. 6:1173-1189, 1992). The RAT1/TAP1 gene product has extensive sequence similarity to a yeast DNA strand transfer protein that is also a riboexonuclease (variously known as KEM1, XRN1, SEP1, DST2, or RAR5; reviewed by Kearsey and Kipling [Trends Cell Biol. 1:110-112, 1991]). The tap1-1 amino acid substitution affects a region of the protein in which KEM1 and TAP1 are highly similar in sequence.

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Selected References

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