Cited by 1,395Tuberculosis Research and EpidemiologyBacterial Genetics and BiotechnologyInfectious Diseases and Tuberculosis

Evaluation of a nutrient starvation model of Mycobacterium tuberculosis persistence by gene and protein expression profiling

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Betts, Joanna C., Lukey, Pauline T., Robb, Linda C., McAdam, Ruth A., Duncan, Ken·2002·Molecular Microbiology

Abstract

Summary: The search for new TB drugs that rapidly and effectively sterilize the tissues and are thus able to shorten the duration of chemotherapy from the current 6 months has been hampered by a lack of understanding of the metabolism of the bacterium when in a ‘persistent’ or latent form. Little is known about the condition in which the bacilli survive, although laboratory models have shown that Mycobacterium tuberculosis can exist in a non‐growing, drug‐resistant state that may mimic persistence in vivo. Using nutrient starvation, we have established a model in which M. tuberculosis arrests growth, decreases its respiration rate and is resistant to isoniazid, rifampicin and metronidazole. We have used microarray and proteome analysis to investigate the response of M. tuberculosis to nutrient starvation. Proteome analysis of 6‐week‐starved cultures revealed the induction of several proteins. Microarray analysis enabled us to monitor gene expression during adaptation to nutrient starvation and confirmed the changes seen at the protein level. This has provided evidence for slowdown of the transcription apparatus, energy metabolism, lipid biosynthesis and cell division in addition to induction of the stringent response and several other genes that may play a role in maintaining long‐term survival within the host. Thus, we have generated a model with which we can search for agents active against persistent M. tuberculosis and revealed a number of potential targets expressed under these conditions.

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Crossref · 10.1046/j.1365-2958.2002.02779.x

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  • During carbon starvation and slow growth, mycobacteria switch to alternative electron donors.

    “During carbon starvation and slow growth, mycobacteria switch to alternative electron donors (16, 20, 45) (Figure 2).”

    From Energetics of Respiration and Oxidative Phosphorylation in Mycobacteria (2014) · cites this paper as [20]

    The Energy metabolism section (page not specified in our copy) reports downregulation of the primary aerobic respiratory chain during nutrient starvation and suggests that other enzymes may help recycle NAD+ or contribute to metabolism. It does not establish that mycobacteria switch to alternative electron donors during carbon starvation and slow growth; the tested condition was nutrient starvation in PBS. (LLM, conf=0.79)

    Experimental — accuracy not yet measured
  • PknA and PknB phosphorylate EmbR, activating transcription of embC, embA and embB during growth, thus ensuring that arabinan levels remain high for expansion of the cell wall.

    “PknA and PknB phosphorylate EmbR85, activating tran- scription of embC, embA and embB81 during growth59,72, thus ensuring that arabinan levels remain high for expan- sion of the cell wall.”

    From The mycobacterial cell envelope — a moving target (2020) · cites this paper as [59]

    The Regulatory function section (p. 717–731; specific page unavailable) reports that pknB is expressed during active growth and is downregulated under starvation; it also places pknA in the same operon. It does not establish that either kinase phosphorylates EmbR or that this activates embC, embA and embB transcription or maintains arabinan levels. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • The transcription of the FAS-I genes fas, accD4 and accD5 seems to correlate with growth.

    “The transcrip- tion of the FAS-​I genes fas, accD4 and accD5 seems to correlate with growth59,60,88.”

    From The mycobacterial cell envelope — a moving target (2020) · cites this paper as [59]

    The Lipid biosynthesis section reports that fas, the FAS-I gene, is downregulated in nutrient-starved cultures; Table 3 lists a −3.13-fold change. This is consistent with fas transcription tracking growth in this model, but the cited passages do not establish the claim for accD4 or accD5. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • mmaA2 and cmaA1, which catalyse the distal cis cyclopropanations on cis/cis-meromycolates, are downregulated by the stress regulator Rel or by starvation.

    “mmaA2 and cmaA1, which catalyse the distal cis cyclopropanations on cis/cis-​ meromycolates, are downregulated by the stress regula- tor Rel88 or by starvation59.”

    From The mycobacterial cell envelope — a moving target (2020) · cites this paper as [59]

    The Lipid biosynthesis section reports that cmaA1 and umaA2 are downregulated in starved cultures. It does not name mmaA2 or specify that these enzymes catalyse distal cis cyclopropanation; its description is limited to modification of unsaturated meromycolic acid. The citation attached to this paper supports the starvation finding, not the separate claim about regulation by Rel. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Downregulation of PknA and PknB in stasis should also decrease fbpA and fbpB expression.

    “Downregulation of PknA and PknB in stasis59 should also decrease fbpA and fbpB expression65.”

    From The mycobacterial cell envelope — a moving target (2020) · cites this paper as [59]

    The Lipid biosynthesis section (pp. 717–731) reports that fbpA and fbpB are downregulated in starved cultures. It does not establish that downregulation of PknA and PknB causes or predicts that decrease. (LLM, conf=0.85)

    Experimental — accuracy not yet measured

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Cites

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Research works printed but not linked: 5

  1. Betts, J.C., and Smith, M.A. (2001) Proteomics. In Myco- bacterium tuberculosis Protocols. Parish, T., and Stoker, N.G. (eds). Totawa, NJ: Humana Press, pp. 315-334.
  2. Neidhardt, F.C., Curtiss, R., Ingraham, J.L., Lin, E.C.C., Low, K.B., Magasanik, B., et al. (eds). Washington, DC: American Society for Microbiology Press, pp. 1488-1496.
  3. Neidhardt, F.C., Curtiss, R., Ingraham, J.L., Lin, E.C.C., Low, K.B., Magasanik, B., et al. (eds). Washington, DC: American Society for Microbiology Press, pp. 1432- 1457.
  4. Neidhardt, F.C., Curtiss, R., Ingraham, J.L., Lin, E.C.C., Low, K.B., Magasanik, B., et al. (eds). Washington, DC: American Society for Microbiology Press, pp. 1417-1431.
  5. Neidhardt, F.C., Curtiss, R., Ingraham, J.L., Lin, E.C.C., Low, K.B., Magasanik, B., et al. (eds). Washington, DC: American Society for Microbiology Press, pp. 1091- 1102.

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Authors
Betts, J. C., Lukey, P. T., Robb, L. C., McAdam, R. A., & Duncan, K.
Affiliations
GlaxoSmithKline (United Kingdom) (GB)
Corresponding author
Betts, Joanna C.
Venue
Molecular Microbiology
Publisher
Wiley
Published
2002-02
Volume
43
Issue
3
Pages
717-731
ISSN
  • 0950-382X (ISSN-L)
  • 1365-2958
OpenAlex
W2125112523
Cited by
1,395
References
67
Citations by year
2026: 35 · 2025: 44 · 2024: 43 · 2023: 47 · 2022: 54 · 2021: 60 · 2020: 64 · 2019: 63 · 2018: 63 · 2017: 60 · 2016: 82 · 2015: 80 · 2014: 74 · 2013: 62 · 2012: 71
FWCI
30.70
Type
journal article
Language
en
Open access
Locations
  • Molecular Microbiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Infectious Diseases › Tuberculosis Research and Epidemiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Health Sciences › Medicine › Surgery › Infectious Diseases and Tuberculosis
Keywords
Mycobacterium tuberculosis, bacterial persistence, nutrient deprivation, latent tuberculosis infection, stringent response, gene expression profiling, proteomics, isoniazid resistance, rifampicin resistance, metronidazole resistance, energy metabolism, lipogenesis, transcriptional regulation, therapeutic target
MeSH terms
Adaptation, Physiological, Bacterial Proteins, Cell Membrane, Energy Metabolism, Lipids, Models, Biological, Mycobacterium tuberculosis, Oxygen, Ribosomes, Rifampin, RNA, Bacterial, Transcription, Genetic, Protein Biosynthesis, Electrophoresis, Gel, Two-Dimensional, Gene Expression Regulation, Bacterial, Oligonucleotide Array Sequence Analysis, Gene Expression Profiling

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