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Attenuated viruses and method of making the same
(1996-04-18)
Disclosed are attenuated viruses, not naturally occurring, that contain one or more additional methylation sites in the genome of the virus compared to the corresponding wild-type virus. Preferably, the methylation sites ...
Genetic and biochemical analysis of a novel Ambler class A β-Lactamase responsible for cefoxitin resistance in Bacteroides species.
(East Carolina University, 1993-05)
A clinical isolate of Bacteroides vulgatus was resistant to tetracycline, clindamycin, ampicillin, cephaloridine,
cefoxitin, and other 13-lactam antibiotics except imipenem. 13-Lactam resistance was mediated by a ...
Autocrine production of extracellular catalase prevents apoptosis of the human CEM T-cell line in serum-free medium.
(East Carolina University, 1993-05-15)
CCRF-CEM is a human T-cell line originally isolated from a child with acute lymphoblastic leukemia. At cell densities > 2 x 10 cells per ml, CEM cells grow in serum-free medium, but at lower cell densities the cultures ...
Biochemical and genetic analyses of a catalase from the anaerobic bacterium Bacteroides fragilis.
(East Carolina University, 1995-06)
A single catalase enzyme was produced by the anaerobic bacterium Bacteroides fragilis when cultures at late
log phase were shifted to aerobic conditions. In anaerobic conditions, catalase activity was detected ...
Cloning and characterization of a conjugated bile acid hydrolase gene from Clostridium perfringens.
(East Carolina University, 1995-07)
The gene encoding a conjugated bile acid hydrolase (CBAH) from Clostridium perfringens 13 has been cloned and expressed in Escherichia coli, and its nucleotide sequence has been determined. Nucleotide and predicted amino ...
The Bacteroides mobilizable transposon Tn4555 integrates by a site-specific recombination mechanism similar to that of the gram-positive bacterial element Tn916
(East Carolina University, 1997-04)
The Bacteroides mobilizable transposon Tn4555 is a 12.2-kb molecule that encodes resistance to cefoxitin. Conjugal transposition is hypothesized to occur via a circular intermediate and is stimulated by coresident tetracycline ...
Identification and Characterization of alcR, a Gene Encoding an AraC-Like Regulator of Alcaligin Siderophore Biosynthesis and Transport in Bordetella pertussis and Bordetella bronchiseptica
(East Carolina University, 1998-02)
A Bordetella bronchiseptica iron transport mutant was isolated following an enrichment procedure based on streptonigrin resistance. The mutant displayed a growth defect on iron-restricted medium containing ferric alcaligin ...
Identification and characterization of iron-regulated Bordetella pertussis alcaligin siderophore biosynthesis genes.
(East Carolina University, 1996-08)
Bordetella bronchiseptica mutants BRM1, BRM6, and BRM9 fail to produce the native dihydroxamate siderophore alcaligin. A 4.5-kb BamHI-SmaI Bordetella pertussis genomic DNA fragment carried multiple genes required to restore ...
Transcriptional Analysis of the Bordetella Alcaligin Siderophore Biosynthesis Operon
(East Carolina University, 1998-02)
The alc gene cluster of Bordetella pertussis includes three genes, alcA, alcB, and alcC, which are involved in alcaligin siderophore biosynthesis in response to iron starvation. The production of AlcA, AlcB, and AlcC in ...
Effect of in vitro transcription on cruciform stability.
(East Carolina University, 1990-05-11)
We have investigated the effect of in vitro transcription on cruciform stability. Replicative form DNA of 4X174 strain ins6240, containing a 48 bp synthetic palindrome in the J-F intercistronic region, was supercoiled in ...