Applied Microbiology and Biotechnology

, Volume 101, Issue 11, pp 4659–4667 | Cite as

Effect of methyl-β-cyclodextrin on gene expression in microbial conversion of phytosterol

  • Victoria Y. Shtratnikova
  • Mikhail I. Schelkunov
  • Dmitry V. Dovbnya
  • Eugeny Y. Bragin
  • Marina V. Donova
Genomics, transcriptomics, proteomics


Modified β-cyclodextrins are widely used for the enhancement of microbial conversions of lipophilic compounds such as steroids. Multiple mechanisms of cyclodextrin-mediated enhancement of phytosterol bioconversion by mycobacteria had previously been shown to include steroid solubilization, alterations in the cell wall permeability for both steroids and nutrients, facilitation of protein leaking, and activity suppression of some steroid-transforming enzymes.In this work, we studied whether cyclodextrins might affect expression of the genes involved in the steroid catabolic pathway. Phytosterol bioconversion with 9α-hydroxy-androst-4-ene-3,17-dione accumulation by Mycobacterium sp. VKM Ac-1817D in the presence of methylated β-cyclodextrin (MCD) was investigated. RNA sequencing of the whole transcriptomes in different combinations of phytosterol and MCD showed a similar expression level of the steroid catabolism genes related to the KstR-regulon and was responsible for side chain and initial steps of steroid core oxidation; whereas, induction levels of the genes related to the KstR2-regulon were attenuated in the presence of MCD in this strain. The data were attenuated with quantitative real-time PCR.The results contribute to the understanding of cyclodextrin effects on microbial steroid conversion and provide a basis for the use of cyclodextrins as expression enhancers for studies of sterol catabolism in actinobacteria.


Phytosterol Steroid catabolism Mycobacterium Transcriptome Methylated β-cyclodextrin 



This work was supported by a Russian Science Foundation (Grant No. 14-24-00169).

Authors’ contributions

VS and EB designed and carried out mRNA isolation, high-throughput sequencing, RT-PCR experiments, and data analysis; MS made bioinformatics calculations; DD designed and carried out growth, bioconversion, and induction experiments; VS, MS, DD, and MD wrote the manuscript; MD coordinated the project, participated in the conception, drafting, and revision of the manuscript. All authors read and approved the final manuscript before submission.

Compliance with ethical standards


This work was supported by a Russian Science Foundation (Grant No. 14-24-00169).

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Supplementary material

253_2017_8288_MOESM1_ESM.pdf (45 kb)
ESM 1 (PDF 45 kb)
253_2017_8288_MOESM21_ESM.xls (118 kb)
ESM 2 (XLS 118 kb)


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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Victoria Y. Shtratnikova
    • 1
  • Mikhail I. Schelkunov
    • 2
  • Dmitry V. Dovbnya
    • 3
  • Eugeny Y. Bragin
    • 3
  • Marina V. Donova
    • 3
    • 4
  1. 1.A.N. Belozersky Research Institute of Physico-Chemical BiologyM.V. Lomonosov Moscow State UniversityMoscowRussian Federation
  2. 2.Russian Academy of SciencesInstitute for Information Transmission ProblemsMoscowRussian Federation
  3. 3.Russian Academy of SciencesG.K. Skryabin Institute of Biochemistry & Physiology of MicroorganismsMoscow regionRussian Federation
  4. 4.People’s Friendship University of RussiaMoscowRussian Federation

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