Abstract
Background
Hormone-sensitive lipase (HSL) is a neutral lipase capable of hydrolysing various kinds of lipids. In comparison to single human Hormone Sensitive Lipase (hHSL), that is induced under nutritional stress, twelve serine hydrolases are annotated as HSL in Mycobacterium tuberculosis (mHSL). Mycobacterium is exposed to multiple stresses inside the host. Therefore, the present study was carried out to investigate if mHSL are also expressed under stress condition and if there is any correlation between various stress conditions and expression pattern of mHSL.
Methods and results
The expression pattern of mHSL under different environmental conditions (in-vitro and ex-vivo) were studied using qRT-PCR in M. tuberculosis H37Ra strain with 16 S rRNA as internal control. Out of 12, only two genes (lipU and lipY) were expressed at very low level in mid log phase culture under aerobic conditions, while 9 genes were expressed at stationary phase of growth. Ten mHSLs were expressed post-infection under ex-vivo conditions in time dependent manner. LipH and lipQ did not express at any time point under ex-vivo condition. The relative expression of most of the genes under individual stress was much higher than observed in ex-vivo conditions. The expression pattern of genes varied with change in stress condition.
Conclusions
Different sets of mHSL genes were expressed under different individual stress conditions pointing towards the requirement of different mHSL to combat different stress conditions. Overall, most of the mHSLs have demonstrated stress dependent expression pointing towards their role in intracellular survival of mycobacteria.
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Abbreviations
- Mtb :
-
Mycobacterium tuberculosis
- M. smegmatis :
-
Mycobacterium smegmatis
- HSL:
-
Hormone Sensitive Lipases
- TG:
-
Triglycerides
- FA:
-
Fatty acid
- RNS and ROS:
-
Reactive nitrogen species and Reactive oxygen species
- MOI:
-
Multiplicity of infection
- OXLDL:
-
Oxidized low density lipoprotein
- TAG:
-
Triacylglycerol
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Acknowledgements
Authors would like to acknowledge Council of Scientific and Industrial Research (CSIR), New Delhi, India for financial assistance to JK {37(1609)/13/EMR-II, dated: 7/10/2013} and fellowship to SA and University Grants Commission (UGC) for providing fellowship to PS.
Funding
This study was funded by Council of Scientific and Industrial Research (CSIR), New Delhi, India (Grant no: 37(1609)/13/EMR-II).
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Jagdeep Kaur conceived and designed the experiments. Stuti Arya performed the relevant experiments and wrote the manuscript. Parul Singh carried out hypoxia and iron stress experiments. Arbind Kumar and Jashandeep Kaur carried out bioinformatic analysis. All authors read and approved the manuscript.
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ESM_Fig. S1 Multiple sequence alignment of 12 mHSL: The conserved pentapeptide motif, GXSXG was shown in yellow box with red boundary; HGGG motif represented oxyanion hole was shown in green box and HGF motif was shown in blue box. These motifs are characteristics of hormone sensitive lipases
ESM_Fig. S2 Growth curve of Mtb H37Ra. Values shown are the average of three individual experiments. Error bars show standard deviations
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Arya, S., Singh, P., Kaur, J. et al. Environment dependent expression of mycobacterium hormone sensitive lipases: expression pattern under ex-vivo and individual in-vitro stress conditions in M. tuberculosis H37Ra. Mol Biol Rep 49, 4583–4593 (2022). https://doi.org/10.1007/s11033-022-07305-4
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DOI: https://doi.org/10.1007/s11033-022-07305-4