title: Identification of Escherichia coli DNA helicase IV with the use of a DNA helicase activity gel.
abstract: A DNA helicase activity gel was developed based on the assumption that DNA helicases could unwind double-stranded DNA in a polyacrylamide matrix. The production of single-stranded DNA was detected by staining the activity gel with acridine orange and visualizing the gel under long-wave UV light. The products of DNA helicase activities appeared as red bands within a green fluorescent background. A novel DNA helicase, called helicase IV, was detected in crude extracts of Escherichia coli with the use of the helicases activity gel assay. The new DNA helicase was purified to near homogeneity. The chromatographic properties and the sequence of its 11 amino-terminal residues proved that helicase IV was distinct from all of the previously described DNA helicases from E. coli.
authors.affiliation: Department of Botany and Microbiology, University of Oklahoma, Norman 73019.
authors.forename: V N
authors.initials: VN
authors.lastname: Trieu
authors.forename: D
authors.initials: D
authors.lastname: McCarthy
mesh_terms: D000595:Amino Acid Sequence; D001681:Biological Assay; D004265:DNA Helicases / Q000302:isolation & purification* / Q000378:metabolism; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000201:enzymology*; D008969:Molecular Sequence Data; D008970:Molecular Weight
chemical_list: D004265:DNA Helicases