Protein that binds to the distal, but not to the proximal, CCAAT of the human thymidine kinase gene promoter

K. E. Lipson, G. Liang, L. Xia, M. B. Prystowsky, Michael B. Prystowsky

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Mobility shift assays were used to examine protein binding to the human TK gene CCAAT boxes. Similar protein binding patterns were observed with probes containing either the proxima[ or distal CCAAT. However, probes containing both CCAAT boxes in which one of the CCAAT boxes was inactivated by mutation did not demonstrate identical binding patterns. One of the complexes formed with the longer probes was only observed when the distal CCAAT was intact. This species was not formed with probes that only contained an intact proximal CCAAT, and its formation could only be competed by oligonucleotides containing the distal CCAAT motif. This observation reveals the existence of a protein that can bind to the distal, but not to the proximal, CCAAT of the human TK promoter. This protein may account for the previous observation that the two CCAAT motifs are not functionally equivalent. The protein that binds to the distal, but not to the proximal, CCAAT (DTK-CBP) was also present in two human cell lines. Significantly more DTK-CBP was present in nuclear extracts of HepG2 and WI38 cells than in TK-ts13 cells. However, this protein was not observed in three different murine cell lines and one primary culture. its abundance in some human cell lines suggests it might modulate the expression of human TK mRNA in cells that express this protein.

Original languageEnglish (US)
Pages (from-to)711-723
Number of pages13
JournalJournal of Cellular Biochemistry
Volume57
Issue number4
StatePublished - 1995

Fingerprint

Thymidine Kinase
Genes
Cells
Proteins
Protein Binding
Cell Line
Hep G2 Cells
Electrophoretic Mobility Shift Assay
Cell culture
Oligonucleotides
Assays
Messenger RNA
Mutation

Keywords

  • DNA-binding protein
  • HepG2
  • Mobility shift
  • TKts13
  • Transcription
  • WI38

ASJC Scopus subject areas

  • Biochemistry
  • Cell Biology

Cite this

Protein that binds to the distal, but not to the proximal, CCAAT of the human thymidine kinase gene promoter. / Lipson, K. E.; Liang, G.; Xia, L.; Prystowsky, M. B.; Prystowsky, Michael B.

In: Journal of Cellular Biochemistry, Vol. 57, No. 4, 1995, p. 711-723.

Research output: Contribution to journalArticle

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AU - Lipson, K. E.

AU - Liang, G.

AU - Xia, L.

AU - Prystowsky, M. B.

AU - Prystowsky, Michael B.

PY - 1995

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AB - Mobility shift assays were used to examine protein binding to the human TK gene CCAAT boxes. Similar protein binding patterns were observed with probes containing either the proxima[ or distal CCAAT. However, probes containing both CCAAT boxes in which one of the CCAAT boxes was inactivated by mutation did not demonstrate identical binding patterns. One of the complexes formed with the longer probes was only observed when the distal CCAAT was intact. This species was not formed with probes that only contained an intact proximal CCAAT, and its formation could only be competed by oligonucleotides containing the distal CCAAT motif. This observation reveals the existence of a protein that can bind to the distal, but not to the proximal, CCAAT of the human TK promoter. This protein may account for the previous observation that the two CCAAT motifs are not functionally equivalent. The protein that binds to the distal, but not to the proximal, CCAAT (DTK-CBP) was also present in two human cell lines. Significantly more DTK-CBP was present in nuclear extracts of HepG2 and WI38 cells than in TK-ts13 cells. However, this protein was not observed in three different murine cell lines and one primary culture. its abundance in some human cell lines suggests it might modulate the expression of human TK mRNA in cells that express this protein.

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