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Expression and structure of the Chlamydia trachomatis DksA ortholog

Journal Article · · Pathogens and Disease
 [1];  [1];  [2];  [3];  [4];  [4];  [4];  [1]
  1. Paul G. Allen School for Global Health, Washington State University , Pullman, WA 99164 , USA
  2. School of Molecular Biosciences, Washington State University , Pullman, WA 99164 , USA; Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory , Richland, WA 99354 , USA; Seattle Structural Genomics Center for Infectious Disease , WA , USA
  3. Seattle Structural Genomics Center for Infectious Disease , WA , USA; UCB , Bainbridge Island, WA 98110 , USA
  4. Department of Biological Sciences, University of Idaho , Moscow, ID 83844 , USA
Chlamydia trachomatis is a bacterial obligate intracellular parasite and a significant cause of human disease, including sexually transmitted infections and trachoma. The bacterial RNA polymerase-binding protein DksA is a transcription factor integral to the multicomponent bacterial stress response pathway known as the stringent response. The genome of C. trachomatis encodes a DksA ortholog (DksACt) that is maximally expressed at 15–20 h post infection, a time frame correlating with the onset of transition between the replicative reticulate body (RB) and infectious elementary body (EB) forms of the pathogen. Ectopic overexpression of DksACt in C. trachomatis prior to RB–EB transitions during infection of HeLa cells resulted in a 39.3% reduction in overall replication (yield) and a 49.6% reduction in recovered EBs. While the overall domain organization of DksACt is similar to the DksA ortholog of Escherichia coli (DksAEc), DksACt did not functionally complement DksAEc. Transcription of dksACt is regulated by tandem promoters, one of which also controls expression of nrdR, encoding a negative regulator of deoxyribonucleotide biosynthesis. The phenotype resulting from ectopic expression of DksACt and the correlation between dksACt and nrdR expression is consistent with a role for DksACt in the C. trachomatis developmental cycle.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
Michigan Economic Development Corporation; National Institutes of Health (NIH); USDOE Office of Science (SC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC), Biological and Environmental Research (BER); Washington State University
Grant/Contract Number:
AC02-06CH11357; AC05-76RL01830
OSTI ID:
1872592
Alternate ID(s):
OSTI ID: 1886307
Report Number(s):
PNNL-SA-149650; APS_265919
Journal Information:
Pathogens and Disease, Journal Name: Pathogens and Disease Journal Issue: 1 Vol. 80; ISSN 2049-632X
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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