Structure of thymidylate kinase from Ehrlichia chaffeensis

Biochemical activities of three pairs of Ehrlichia chaffeensis two-component regulatory system proteins involved in inhibition of lysosomal fusion.

Ehrlichia chaffeensis, the etiologic agent of human monocytic ehrlichiosis, replicates in early endosomes by avoiding lysosomal fusion in monocytes and macrophages. In E. chaffeensis we predicted three pairs of putative two-component regulatory systems (TCSs) designated PleC-PleD, NtrY-NtrX, and CckA-CtrA based on amino acid sequence homology. In the present study to determine biochemical pairs...

Ehrlichia chaffeensis Transcription Factors in Human Monocytes by Janus Kinases and Latent Cytoplasmic of Interferon-Induced Tyrosine Phosphorylation Protein Kinase A-Mediated Inhibition of Gamma

Natural coinfection of a white-tailed deer (Odocoileus virginianus) population with three Ehrlichia spp.

The ticks Amblyomma americanum and Ixodes scapularis, strongly implicated vectors of Ehrlichia chaffeensis and the human granulocytic ehrlichiosis (HGE) agent, respectively, commonly are found on white-tailed deer (Odocoileus virginianus). As deer can be infected with E. chaffeensis, the HGE agent, and another Ehrlichia-like organism, a deer population parasitized by both tick species in coasta...

Detection of Ehrlichia chaffeensis DNA in Amblyomma americanum ticks in Connecticut and Rhode Island.

Ehrlichia chaffeensis, the causative agent of human monocytic ehrlichiosis, is transmitted by Amblyomma americanum ticks, which are most abundant in the southern United States. Because serologic evidence suggests that residents of Connecticut are exposed to E. chaffeensis, A. americanum ticks were collected in Connecticut and Rhode Island for PCR analysis to detect E. chaffeensis DNA. Eight of ...

Natural infection of domestic goats with Ehrlichia chaffeensis.

Thirty-eight domestic goats from an area of Ehrlichia chaffeensis endemicity were tested for antibodies reactive to E. chaffeensis and for E. chaffeensis-specific 16S rRNA gene fragments by an indirect fluorescent antibody test and a nested PCR assay, respectively. Twenty-eight of 38 (73.7%) goats had antibodies reactive to E. chaffeensis (>/=1:128), and 6 of 38 (15.8%) goats were positive by d...