David Bruce Lackey

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The in vivo administration of enzyme-inhibiting drugs for cancer and infectious disease often results in overexpression of the targeted enzyme. We have developed an enzyme-catalyzed therapeutic agent (ECTA) approach in which an enzyme overexpressed within the resistant cells is recruited as an intracellular catalyst for converting a relatively non-toxic(More)
A novel form of DNA polymerase I (deoxynucleosidetriphosphate:DNA deoxynucleotidyltransferase, DNA nucleotidyltransferase, EC 2.7.7.7) activity has been isolated from Escherichia coli cells that had been activated for expression of the DNA damage-inducible genes. Induction was by treatment of normal cells or cells carrying the spr-51 and tif-1 mutations(More)
Methyl groups placed on varphiXsB1 replicative form DNA by the Escherichia coli B modification enzyme are located in the overlap between fragments Mbo II-3 and Alu I-2, a 61-base-pair DNA segment. Mutations that led to loss of susceptibility to restriction by E. coli B occurred within this segment at three positions spanning 14 nucleotides. A sequence(More)
The purification is reported of an endopeptidase, XSCEP1 (Xenopus skin cysteine endopeptidase), present in skin secretions of Xenopus. The procedure involved an initial concentration of the enzyme by batchwise anion-exchange chromatography and ammonium sulphate precipitation. The proteolytic activity, determined with Z-Phe-Arg-Amc (Z, benzyloxycarbonyl;(More)
The tripeptide pyroGlu-Tyr-Pro amide was isolated from an aqueous extract prepared from dried alfalfa pellets. The tripeptide was quantitated using a competitive radioimmunoassay in which 125I-labeled thyrotropin-releasing hormone (TRH), is displaced from antibody specific to TRH (pyroGlu-His-Pro amide). The pyroGlu-Tyr-Pro amide was purified by passing the(More)
An endonuclease was detected in strains of Salmonella typhimurium containing the drug resistance plasmid pKM101. The enzyme was not detectable in strains lacking this plasmid, but it was present in strains containing mutants of pKM101 that were no longer able to enhance host cell mutagenesis. The endonuclease had a molecular weight of roughly 75,000 and, at(More)
DNA polymerase I* is a form of the DNA polymerase I isolated from Escherichia coli which are expressing recA/lexA (SOS) functions. Induction of recA or polA1 cells by nalidixic acid does not result in the appearance of pol I*, but lexA or recA mutants that are constitutive for SOS functions constitutively express pol I* and mutants which lack functional(More)
I have designed an unamplified assay for human telomerase based on the hybridization protection assay. This assay measures in vitro synthesis of the human telomeric repeat DNA sequence (TTAGGG)N by solution hybridization with a chemiluminescent acridinium ester oligonucleotide probe. The assay is capable of detecting less than 0. 1 fmol of the telomerase(More)
OBJECTIVE To describe a protocol for endovenous laser treatment that is highly effective, has no significant complications, and is well accepted by patients. This is the first published report that designates complete absence of the treated vein as the definition of a successful endovenous laser treatment. METHODS A retrospective review of 516 endovenous(More)