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Applicability of MALDI mass spectrometry for diagnostics of phase variants in bacterial populations

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Abstract

Efficiency of MALDI mass spectrometry for differentiation between phenotypic phase variants (in colony morphology and virulence/avirulence) was investigated for saprotrophic and opportunistically pathogenic bacteria of five genera (Acinetobacter, Arthrobacter, Rhodococcus, Corynebacterium, and Escherichia). Analysis of MALDI spectra (on the SA and HCCA matrices) included (1) determination of similarity of the protein spectra as a percentage of the common protein peaks to the total amount of proteins, which reflects the phylogenetic relationships of the objects and has been recommended for identification of closely related species; (2) comparison of intensities of the common peaks; and (3) the presence of specific peaks as determinative characteristics of the variants. Under the standard analytical conditions, the similarity between the MALDI profiles was shown to increase in the row: genus–species–strain–variant. Assessment of intensities of the common peaks was most applicable for differentiation between phase variants, especially in the case of high similarity of their profiles. Phase variants (A. oxydans strain K14) with similar colony morphotypes (S, R, M, and Sm) grown on different media (LB agar, TSA, and TGYg) exhibited differences in their protein profiles reflecting the differences in their physiological characteristics. This finding is in agreement with our previous results on screening of the R. opacus with similar colony morphology and different substrate specificity in decomposition of chlorinated phenols. Analysis of MALDI spectra is probably the only efficient method for detection of such variants.

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Authors and Affiliations

  1. Winogradsky Institute of Microbiology, Russian Academy of Sciences, pr. 60-letiya Oktyabrya 7, k. 2, Moscow, 117312, Russia

    N. A. Kryazhevskikh, N. G. Loiko, E. V. Demkina, A. L. Mulyukin, Yu. A. Nikolaev & G. I. El’-Registan

  2. Chemical Faculty, Lomonosov Moscow State University, Moscow, Russia

    A. T. Lebedev

  3. Central Research Institute for Epidemiology, Rospotrebnadzor, Moscow, Russia

    A. M. Gaponov & A. V. Tutel’yan

  4. Rogachev Federal Scientific and Clinical Center for Pediatric Hematology, Oncology, and Immunology, Moscow, Russia

    A. M. Gaponov & A. V. Tutel’yan

Authors
  1. N. A. Kryazhevskikh
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  2. N. G. Loiko
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  3. E. V. Demkina
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  4. A. L. Mulyukin
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  5. A. T. Lebedev
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  6. A. M. Gaponov
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  7. A. V. Tutel’yan
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  8. Yu. A. Nikolaev
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  9. G. I. El’-Registan
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Correspondence to N. G. Loiko.

Additional information

Original Russian Text © N.A. Kryazhevskikh, N.G. Loiko, E.V. Demkina, A.L. Mulyukin, A.T. Lebedev, A.M. Gaponov, A.V. Tutel’yan, Yu.A. Nikolaev, G.I. El’-Registan, 2015, published in Mikrobiologiya, 2015, Vol. 84, No. 3, pp. 291–310.

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Kryazhevskikh, N.A., Loiko, N.G., Demkina, E.V. et al. Applicability of MALDI mass spectrometry for diagnostics of phase variants in bacterial populations. Microbiology 84, 328–346 (2015). https://doi.org/10.1134/S0026261715030121

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  • DOI: https://doi.org/10.1134/S0026261715030121

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