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We recently reported the discovery and preliminary characterization of Mimivirus, the largest known virus, with a 400-nanometer particle size comparable to mycoplasma. Mimivirus is a double-stranded DNA virus growing in amoebae. We now present its 1,181,404-base pair genome sequence, consisting of 1262 putative open reading frames, 10% of which exhibit a(More)
We sequenced the genome of Rickettsia felis, a flea-associated obligate intracellular alpha-proteobacterium causing spotted fever in humans. Besides a circular chromosome of 1,485,148 bp, R. felis exhibits the first putative conjugative plasmid identified among obligate intracellular bacteria. This plasmid is found in a short (39,263 bp) and a long (62,829(More)
Mimivirus is the largest known virus. Using cryo-electron microscopy, the virus was shown to be icosahedral, covered by long fibers, and appears to have at least two lipid membranes within its protein capsid. A unique vertex, presumably for attachment and infection of the host, can be seen for particles that have a suitable orientation on the micrographs.
The restriction factor BST-2/tetherin contains two membrane anchors employed to retain some enveloped viruses, including HIV-1 tethered to the plasma membrane in the absence of virus-encoded antagonists. The 2.77 A crystal structure of the BST-2/tetherin extracellular core presented here reveals a parallel 90 A long disulfide-linked coiled-coil domain,(More)
Sequencing of the Rickettsia conorii genome and its comparison with its closest sequenced pathogenic relative, i.e., Rickettsia prowazekii, provided powerful insights into the evolution of these microbial pathogens. However, advances in our knowledge of rickettsial diseases are still hindered by the difficulty of working with strict intracellular bacteria(More)
Bronchopulmonary hyperreactivity (BHR), an increased responsiveness to nonspecific bronchoconstrictor agents, is a well-known characteristic of bronchial asthma. It has been recently suggested that the severity of this disease is related to the endotoxin content of house dust. In the present report, it is shown that the i.p. administration of bacterial LPS(More)
BACKGROUND The phylum Crenarchaeota lacks the FtsZ cell division hallmark of bacteria and employs instead Cdv proteins. While CdvB and CdvC are homologues of the eukaryotic ESCRT-III and Vps4 proteins, implicated in membrane fission processes during multivesicular body biogenesis, cytokinesis and budding of some enveloped viruses, little is known about the(More)
Whipple’s disease is a systemic chronic infection caused by Tropheryma whipplei. Asymptomatic people may carry T. whipplei in their digestive tract and this can be determined by PCR, making serological diagnosis useful to distinguish between carriers and patients. Putative antigenic proteins were selected by computational analysis of the T. whipplei genome,(More)
The Rickettsia genus is composed of Gram-negative bacteria responsible for Typhus and spotted fevers. Because of the limitations imposed by their obligate intracellular location, the molecular mechanisms responsible for their pathogenicity remain poorly understood. Several rickettsial genomes are now available, thus providing the foundation for a new era of(More)
Genome analysis of Rickettsia felis highlighted the presence of three patatin-like protein (PLP) genes (pat1, pat2A, and pat2B), whereas only one PLP gene (pat1) is found in the other sequenced rickettsial genomes. Here, we aligned the rickettsial PLPs with characterized patatins from plants and found that they possess all the conserved amino acid residues(More)