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• W2162267457 abstract "ABSTRACT The EspA protein of Mycobacterium tuberculosis is essential for the type VII ESX-1 protein secretion apparatus, which delivers the principal virulence factors ESAT-6 and CFP-10. In this study, site-directed mutagenesis of EspA was performed to elucidate its influence on the ESX-1 system. Replacing Trp 55 (W55) or Gly 57 (G57) residues in the putative W-X-G motif of EspA with arginines impaired ESAT-6 and CFP-10 secretion in vitro and attenuated M. tuberculosis . Replacing the Phe 50 (F50) and Lys 62 (K62) residues, which flank the W-X-G motif, with arginine and alanine, respectively, destabilized EspA, abolished ESAT-6 and CFP-10 secretion in vitro , and attenuated M. tuberculosis . Likewise, replacing the Phe 5 (F5) and Lys 41 (K41) residues with arginine and alanine, respectively, also destabilized EspA and blocked ESAT-6 and CFP-10 secretion in vitro . However, these two particular mutations did not attenuate M. tuberculosis in cellular models of infection or during acute infection in mice. We have thus identified amino acid residues in EspA that are important for facilitating ESAT-6 and CFP-10 secretion and virulence. However, our data also indicate for the first time that blockage of M. tuberculosis ESAT-6 and CFP-10 secretion in vitro and attenuation are mutually exclusive." @default.
• W2162267457 created "2016-06-24" @default.
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• W2162267457 date "2013-12-15" @default.
• W2162267457 modified "2023-10-16" @default.
• W2162267457 title "Phenotypic Profiling of Mycobacterium tuberculosis EspA Point Mutants Reveals that Blockage of ESAT-6 and CFP-10 Secretion <i>In Vitro</i> Does Not Always Correlate with Attenuation of Virulence" @default.
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• W2162267457 doi "https://doi.org/10.1128/jb.00967-13" @default.
• W2162267457 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3889621" @default.
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