Abstract
Resuscitation-promoting factor (RPF) proteins reactivate stationary-phase cultures of (G+C)-rich Gram-positive bacteria including the causative agent of tuberculosis, Mycobacterium tuberculosis. We report the solution structure of the RPF domain from M. tuberculosis Rv1009 (RpfB) solved by heteronuclear multidimensional NMR. Structural homology with various glycoside hydrolases suggested that RpfB cleaved oligosaccharides. Biochemical studies indicate that a conserved active site glutamate is important for resuscitation activity. These data, as well as the presence of a clear binding pocket for a large molecule, indicate that oligosaccharide cleavage is probably the signal for revival from dormancy.
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Acknowledgements
This work was supported by European Union grant QLK2-2001-02018 (M.C-G. and N.H.K.). NMR experiments were recorded and analyzed using the facilities of the structural biology platform RIO (Centre de Biochimie Structurale, Montpellier, France). We thank B. Sarra for help with CD.
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Supplementary information
Supplementary Fig. 1
Chemical shift change against residue. (PDF 1496 kb)
Supplementary Fig. 2
R.m.s. deviation on addition of (NAG)4 to lysozyme by residue. (PDF 928 kb)
Supplementary Fig. 3
CD spectra of recombinant unmutated and E80A mutant protein. (PDF 278 kb)
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Cohen-Gonsaud, M., Barthe, P., Bagnéris, C. et al. The structure of a resuscitation-promoting factor domain from Mycobacterium tuberculosis shows homology to lysozymes. Nat Struct Mol Biol 12, 270–273 (2005). https://doi.org/10.1038/nsmb905
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DOI: https://doi.org/10.1038/nsmb905
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