The sensor kinase MprB is required for Rhodococcus equi virulence

Veterinary Microbiology
Iain MacArthurJohn F Prescott

Abstract

Rhodococcus equi is a soil bacterium and, like Mycobacterium tuberculosis, a member of the mycolata. Through possession of a virulence plasmid, it has the ability to infect the alveolar macrophages of foals, resulting in pyogranulomatous bronchopneumonia. The virulence plasmid has an orphan two-component system (TCS) regulatory gene, orf8, mutation of which completely attenuates virulence. This study attempted to find the cognate sensor kinase (SK) of orf8. Annotation of the R. equi strain 103 genome identified 23 TCSs encoded on the chromosome, which were used in a DNA microarray to compare TCS gene transcription in murine macrophage-like cells to growth in vitro. This identified six SKs as significantly up-regulated during growth in macrophages. Mutants of these SKs were constructed and their ability to persist in macrophages was determined with one SK, MprB, found to be required for intracellular survival. The attenuation of the mprB- mutant, and its complementation, was confirmed in a mouse virulence assay. In silico analysis of the R. equi genome sequence identified an MprA binding box motif homologous to that of M. tuberculosis, on mprA, pepD, sigB and sigE. The results of this study also show that R. equi responds to the...Continue Reading

References

Apr 20, 2001·Proceedings of the National Academy of Sciences of the United States of America·V G TusherG Chu
May 10, 2003·Clinical and Diagnostic Laboratory Immunology·Kathleen E Hooper-McGrevyJohn F Prescott
Sep 7, 2005·Veterinary Microbiology·Md Tanvir RahmanJohn F Prescott
May 15, 2007·Journal of Bacteriology·Gavin A ByrneWim G Meijer
Oct 7, 2008·Trends in Microbiology·Michelle RyndakIssar Smith

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Citations

Dec 22, 2010·BMC Genomics·Robert H N Williams, David E Whitworth
Nov 19, 2011·Journal of Veterinary Internal Medicine·S GiguèreN M Slovis
Oct 19, 2012·Virulence·Marina A ForrelladFabiana Bigi
May 24, 2014·Veterinary Microbiology·Patricia González-IglesiasJosé A Vazquez-Boland
Mar 17, 2018·Tropical Animal Health and Production·Amanda Bonalume Cordeiro de MoraisMárcio Garcia Ribeiro
Jun 11, 2021·The Journal of Veterinary Medical Science·Nuttapone SangkanjanavanichShinji Takai

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