Vitamin B6 biosynthesis is essential for survival and virulence of Mycobacterium tuberculosis

• Verfasst von: Dick, Thomas [VerfasserIn]
• Verfasst von: Manjunatha, Ujjini [VerfasserIn]
• Verfasst von: Kappes, Barbara [VerfasserIn]
• Verfasst von: Gengenbacher, Martin [VerfasserIn]
• Titel: Vitamin B6 biosynthesis is essential for survival and virulence of Mycobacterium tuberculosis
• Verf.angabe: Thomas Dick, Ujjini Manjunatha, Barbara Kappes and Martin Gengenbacher
• E-Jahr: 2010
• Jahr: 22 September 2010
• Umfang: 9 S.
• Fussnoten: Gesehen am 12.02.2024
• Titel Quelle: Enthalten in: Molecular microbiology
• Ort Quelle: Oxford [u.a.] : Wiley-Blackwell, 1987
• Jahr Quelle: 2010
• Band/Heft Quelle: 78(2010), 4, Seite 980-988
• ISSN Quelle: 1365-2958
• DOI: doi:10.1111/j.1365-2958.2010.07381.x
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Animal Structures
• Sach-SW: Animals
• Sach-SW: Bacterial Proteins
• Sach-SW: Biosynthetic Pathways
• Sach-SW: Disease Models, Animal
• Sach-SW: Gene Knockout Techniques
• Sach-SW: Gram-Positive Bacteria
• Sach-SW: Mice
• Sach-SW: Microbial Viability
• Sach-SW: Mutagenesis, Insertional
• Sach-SW: Mycobacterium tuberculosis
• Sach-SW: Tuberculosis
• Sach-SW: Virulence
• Sach-SW: Vitamin B 6
• K10plus-PPN: 1880547546

Abstract

With 500000 cases of multidrug-resistant tuberculosis there is an urgent need for attractive targets to enable the discovery of novel antimycobacterials. The biosynthesis of essential cofactors is of particular interest as these pathways are absent in man and their inhibition is expected to affect the metabolism of Mycobacterium tuberculosis at multiple sites. Our data demonstrate that the pathogen synthesizes pyridoxal 5-phosphate (PLP), the bioactive form of vitamin B6, by a heteromeric PLP synthase composed of Pdx1 (Rv2606c) and Pdx2 (Rv2604c). Disruption of the pdx1 gene generated a strictly B6 auxotrophic M. tuberculosis mutant, Δpdx1. Removal of the cofactor during exponential growth or stationary phase demonstrated the essentiality of vitamin B6 biosynthesis for growth and survival of the pathogen in culture. In a tuberculosis dormancy model based on gradual oxygen depletion, de novo biosynthesis of PLP was required for regrowth of the bacillus after direct oxygen exposure. The Δpdx1 mutant showed a severe growth defect in immunocompetent mice: bacilli applied intranasally failed to persist in host tissues and were quickly cleared. We conclude that vitamin B6 biosynthesis is required for survival of M. tuberculosis in vivo and thus might represent a candidate pathway for the development of new antitubercular agents.