Diane Apostolakos

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We have derived a DNA-mediated transformation system for the yeast Yarrowia lipolytica based on the lithium acetate method Ito et al. (1983) developed for Saccharomyces cerevisiae. The first plasmid used, pLD25, contains the Y. lipolytica LEU2 gene (coding for the enzyme beta-isopropylmalate dehydrogenase, EC on a 6.6 kb piece of DNA inserted into(More)
Proteus rettgeri and Escherichia coli W were shown to express structurally different penicillin G acylases. The enzymes had similar substrate specificity but differed in molecular weight, isoelectric point, and electrophoretic mobility in polyacrylamide gels and did not antigenically cross-react. When the organisms were subjected to environmental conditions(More)
The regulation of the penicillin acylase in proteus rettgeri ATCC 31052 was compared with that of the enzyme in Escherichia coli ATCC 9637. Unlike the E. coli acylase, the P. rettgeri enzyme was not induced by phenylacetic acid, nor was it subject to catabolite repression by glucose. The P. rettgeri acylase appears to be expressed constitutively but is(More)
A temperature-sensitive mutation affecting pyridoxine biosynthesis inEscherichia coli has been isolated following nitrosoguanidine mutagenesis. This is the first report of a conditional mutation affecting that pathway. Three-point transductional analysis and an Hfr mating test indicate that the affected locus ispdxJ and that the gene order(More)
Case Study A 58-year-old alcoholic man presented with pain, swelling, and bruising of his right leg. He had no history of trauma or injury. His medical history was significant for frequent spontaneous hematomas in his legs (Figure 1), the first and most dramatic of which was a large thigh hematoma occurring 4 years earlier. This area became infected,(More)
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