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The regulation of the expression of the operons in the flagella-chemotaxis regulon in Escherichia coli has been shown to be a highly ordered cascade which closely parallels the assembly of the flagellar structure and the chemotaxis machinery (T. Iino, Annu. Rev. Genet. 11:161-182, 1977; Y. Komeda, J. Bacteriol. 168: 1315-1318). The master operon, flbB, has(More)
Three critical enzymes catechol oxygenase II (chlorocatechol dioxygenase), muconate cycloisomerase II, and dienelactone hydrolase, are involved in the degradation of chlorocatechols, which are obligatory intermediates in the catabolism of chlorinated aromatic compounds. The organization and complete nucleotide sequence of the genes for these enzymes have(More)
The clcD structural gene encodes dienelactone hydrolase (EC, an enzyme that catalyzes the conversion of dienelactones to maleylacetate. The gene is part of the clc gene cluster involved in the utilization of chlorocatechol and is carried on a 4.3-kilobase-pair BglII fragment subcloned from the Pseudomonas degradative plasmid pAC27. A(More)
Pseudomonas cepacia strain AC1100, capable of growth on 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), was mutated to the 2,4,5-T- strain PT88 by a ColE1::Tn5 chromosomal insertion. Using cloned DNA from the region flanking the insertion, a 1477-bp sequence (designated RS1100) was identified which was repeated several times on the wild-type chromosome and was(More)
The enzyme, cis,cis-muconate lactonizing enzyme I (MLEI; EC, has been proposed to play a key role in the beta-ketoadipate pathway of benzoate degradation. A 10.2-kb EcoRI fragment isolated from a Pseudomonas putida genomic library complemented a mutant deficient in this enzyme. The MLEI coding gene, catB, was localized to a 1.6-kb fragment which(More)
Phosphomannose isomerase (PMI) has been proposed to catalyze the first step of the alginic acid biosynthetic pathway in Pseudomonas aeruginosa. The nucleotide sequence of the P. aeruginosa pmi gene contained on a 2.0-kb BamHI-SstI DNA fragment has been determined. The gene was defined by the start and stop codons and by in vitro disruption of an open(More)
Research Center have been working with the United States satellite communication industry over the past 16 years to develop advanced communication and networking technologies to improve commercial satellite communications. With the recent explosion of the Internet and the enormous business opportunities available to communication system providers , great(More)
BACKGROUND This study evaluated the relationship between illicit drug use and HIV-1 disease severity in HIV-1-infected patients enrolled in the DREXELMED HIV/AIDS Genetic Analysis Cohort. Because cocaine is known to have immunomodulatory effects, the cytokine profiles of preferential nonusers, cocaine users, and multidrug users were analyzed to understand(More)
The adaptation of human immunodeficiency virus type-1 (HIV-1) to an array of physiologic niches is advantaged by the plasticity of the viral genome, encoded proteins, and promoter. CXCR4-utilizing (X4) viruses preferentially, but not universally, infect CD4+ T cells, generating high levels of virus within activated HIV-1-infected T cells that can be(More)