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Title: Studies of a Ring-Cleaving Dioxygenase Illuminate the Role of Cholesterol Metabolism in the Pathogenesis of Mycobacterium tuberculosis

Journal Article · · PLoS Pathogens
 [1];  [2];  [3];  [2];  [4];  [4];  [5];  [6];  [3];  [2];  [7]
  1. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Biochemistry and Molecular Biology; DOE/OSTI
  2. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Biochemistry and Molecular Biology
  3. Albert Einstein College of Medicine, Bronx, NY (United States). Howard Hughes Medical Inst.
  4. Queen's Univ., Kingston, ON (Canada). Dept. of Chemistry
  5. Texas A & M Univ., College Station, TX (United States). Health Science Center. Dept. of Microbial and Molecular Pathogenesis
  6. Johns Hopkins Univ., Baltimore, MD (United States). Dept. of Medicine. Center for Tuberculosis Research
  7. Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Biochemistry and Molecular Biology; Univ. of British Columbia, Vancouver, BC (Canada). Dept. of Microbiology and Immunology

Mycobacterium tuberculosis, the etiological agent of TB, possesses a cholesterol catabolic pathway implicated in pathogenesis. This pathway includes an iron-dependent extradiol dioxygenase, HsaC, that cleaves catechols. Immunocompromised mice infected with a DhsaC mutant of M. tuberculosis H37Rv survived 50% longer than mice infected with the wild-type strain. In guinea pigs, the mutant disseminated more slowly to the spleen, persisted less successfully in the lung, and caused little pathology. These data establish that, while cholesterol metabolism by M. tuberculosis appears to be most important during the chronic stage of infection, it begins much earlier and may contribute to the pathogen’s dissemination within the host. Purified HsaC efficiently cleaved the catecholic cholesterol metabolite, DHSA (3,4-dihydroxy-9,10- seconandrost-1,3,5(10)-triene-9,17-dione; kcat/Km = 14.460.5 mM-1 s-1), and was inactivated by a halogenated substrate analogue (partition coefficient,50). Remarkably, cholesterol caused loss of viability in the DhsaC mutant, consistent with catechol toxicity. Structures of HsaC:DHSA binary complexes at 2.1 A revealed two catechol-binding modes: bidentate binding to the active site iron, as has been reported in similar enzymes, and, unexpectedly, monodentate binding. The position of the bicyclo-alkanone moiety of DHSA was very similar in the two binding modes, suggesting that this interaction is a determinant in the initial substrate-binding event. These data provide insights into the binding of catechols by extradiol dioxygenases and facilitate inhibitor design.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER). Biological Systems Science Division
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1627891
Journal Information:
PLoS Pathogens, Journal Name: PLoS Pathogens Journal Issue: 3 Vol. 5; ISSN 1553-7374
Publisher:
Public Library of ScienceCopyright Statement
Country of Publication:
United States
Language:
English

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