A novel DNA helicase from calf thymus

G. Siegal, J. J. Turchi, C. B. Jessee, T. W. Myers, R. A. Bambara

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

We report the purification and characterization of a novel DNA helicase from calf thymus tissue. This enzyme partially copurifies with DNA polymerase ε* through many of the chromatographic procedures used to isolate it. The enzyme contains an intrinsic DNA-dependent ATPase activity. It can displace short oligonucleotides annealed to long single stranded substrates, in an ATP-dependent reaction. Use of this assay indicates that the DNA helicase translocates in a 3' to 5' direction with respect to the substrate strand to which it is bound. Maximal efficiency of displacement is accomplished by hydrolysis of (d)ATP as cofactor, however, (d)CTP can also be utilized resulting in a 5-fold decrease in the level of displacement. Displacement activity is enhanced by the presence of saturating amounts of Escherichia coli single stranded DNA-binding protein, not affected by the presence of phage T4 gene 32 protein, and inhibited by human replication factor A. The DNA helicase has a molecular mass of approximately 104 kDa as measured by denaturing gel electrophoresis, and an S value of 5.4 obtained from glycerol gradient sedimentation. Direct [α-32P]ATP cross-linking labels a protein of molecular mass approximately 105 kDa, providing further evidence that this polypeptide contains the helicase active site. In view of the differences in the properties of this helicase from four others recently identified in calf and designated A through D, we propose the name helicase E.

Original languageEnglish (US)
Pages (from-to)13629-13635
Number of pages7
JournalJournal of Biological Chemistry
Volume267
Issue number19
StatePublished - Jan 1 1992

Fingerprint

DNA Helicases
Thymus
Thymus Gland
Adenosine Triphosphate
Molecular mass
Replication Protein A
Cytidine Triphosphate
Bacteriophage T4
Bacteriophages
DNA-Binding Proteins
Substrates
DNA-Directed DNA Polymerase
Enzymes
Human engineering
Electrophoresis
Sedimentation
Oligonucleotides
Glycerol
Escherichia coli
Names

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Cite this

Siegal, G., Turchi, J. J., Jessee, C. B., Myers, T. W., & Bambara, R. A. (1992). A novel DNA helicase from calf thymus. Journal of Biological Chemistry, 267(19), 13629-13635.

A novel DNA helicase from calf thymus. / Siegal, G.; Turchi, J. J.; Jessee, C. B.; Myers, T. W.; Bambara, R. A.

In: Journal of Biological Chemistry, Vol. 267, No. 19, 01.01.1992, p. 13629-13635.

Research output: Contribution to journalArticle

Siegal, G, Turchi, JJ, Jessee, CB, Myers, TW & Bambara, RA 1992, 'A novel DNA helicase from calf thymus', Journal of Biological Chemistry, vol. 267, no. 19, pp. 13629-13635.
Siegal G, Turchi JJ, Jessee CB, Myers TW, Bambara RA. A novel DNA helicase from calf thymus. Journal of Biological Chemistry. 1992 Jan 1;267(19):13629-13635.
Siegal, G. ; Turchi, J. J. ; Jessee, C. B. ; Myers, T. W. ; Bambara, R. A. / A novel DNA helicase from calf thymus. In: Journal of Biological Chemistry. 1992 ; Vol. 267, No. 19. pp. 13629-13635.
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