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Proteomic analysis reveals the damaging role of low redox laccase from Yersinia enterocolitica strain 8081 in the midgut of Helicoverpa armigera

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Abstract

Objective

Earlier, we have found that the enteropathogenic Yersinia enterocolitica have evolved the survival mechanisms that regulate the expression of laccase-encoding genes in the gut. The present study aims to characterize the purified recombinant laccase from Y. enterocolitica strain 8081 biovar 1B and understand its effect on the midgut of cotton bollworm, Helicoverpa armigera (Hübner) larvae.

Results

The recombinant laccase protein showed high purity fold and low molecular mass (~ 43 kDa). H. armigera larvae fed with laccase protein showed a significant decrease in body weight and damage in the midgut. Further, transmission electron microscopy (TEM) studies revealed the negative effect of laccase protein on trachea, malpighian tubules, and villi of the insect. The proteome comparison between control and laccase-fed larvae of cotton bollworm showed significant expression of proteolytic enzymes, oxidoreductases, cytoskeletal proteins, ribosomal proteins; and proteins for citrate (TCA cycle) cycle, glycolysis, stress response, cell redox homeostasis, xenobiotic degradation, and insect defence. Moreover, it also resulted in the reduction of antioxidants, increased melanization (insect innate immune response), and enhanced free radical generation.

Conclusions

All these data collectively suggest that H. armigera (Hübner) larvae can be used to study the effect of microbes and their metabolites on the host physiology, anatomy, and survival.

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Acknowledgements

The authors thank Prof. Deepak Pental, CGMCP, University of Delhi South Campus, New Delhi, India for the insect trial facility.

Supplementary information

Supplementary Figure 1—Optimization of recombinant laccase production from Yersinia enterocolitica strain 8081.

Supplementary Figure 2—I Coomassie-stained SDS-PAGE gel of induced E. coli BL21 cells harboring expression plasmid vector pET28a with laccase gene from Y. enterocolitica strain 8081. Induction was done at 200 rpm with 1 mM IPTG. Lanes: a Control (without induction) b Induction for 2 h at 25 °C; c Induction for 3 h at 25 °C; d Induction for 4 h at 25 °C; e Induction for 2 h at 30 °C; f Induction for 3 h at 30 °C; g Induction for 4 h at 30 °C; h Induction for 2 h at 37 °C; i Induction for 3 h at 37 °C; j Induction for 4 h at 37 °C. II Expression at 100 rpm for 4 h and then kept at static for 16 h at 30 °C a–d: from a Induction at 30 °C; b Induction at 25 °C; c Induction at 16 °C and d uninduced III Expression at 100 rpm for 4 h and then kept at static for 16 h at 4 °C. a Induction at 25 °C; b. Induction at 16 °C.

Supplementary Figure 3—A Coomassie-stained SDS-PAGE gel of solubilized inclusion bodies: I Supernatant II Pellet B & C. Purification of laccase protein using B. Ni–NTA affinity chromatography: I Wash (I) II Wash (II) and III Eluted laccase C Zymogram of purified laccase using ABTS as substrate

Supplementary Figure 4—Cyclic voltammograms obtained for Yersinia enterocolitica strain 8081 (A, B, C) and Bacillus pumilis strain DSKK1 (D, E, F) recombinant laccases with 1mM ABTS (in red) and without ABTS (in blue) A, D at pH 5 using citrate-phosphate buffer; B, E at pH 7 using Tris buffer, and C, F at pH 10 using carbonate-bicarbonate buffer.

Supplementary Table 1—Composition of artificial diet

Supplementary Table 2—Gene ontology (GO) analysis of identified proteins (≥ 1 PSMs in black and ≥ 5 PSMs in blue) from H. armigera larvae with and without recombinant laccase feeding

Supplementary Table 3—Distribution of differentially regulated proteins (with PSMs ≥ 5) from normal diet-fed and recombinant laccase-fed H. armigera larvae gut into various enzyme classes

Funding

This work is supported by grants from the UGC-New Delhi [Grant No. 39-204/1010(SR)]. The FIST-DST grant to the Department of Microbiology is sincerely acknowledged.

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Correspondence to Krishna Kant Sharma.

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All authors declare that they have no conflict of interest.

Research involving animal and/or human rights

This article does not contain any studies with animals performed by any of the authors. Helicoverpa armigera has not been notified under any act or laws and rules thereof of the Government of India as an endangered or threatened species restricting or regulating its collection and observation. Therefore, no permits were required.

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Ahlawat, S., Singh, D., Yadav, A. et al. Proteomic analysis reveals the damaging role of low redox laccase from Yersinia enterocolitica strain 8081 in the midgut of Helicoverpa armigera. Biotechnol Lett 42, 2189–2210 (2020). https://doi.org/10.1007/s10529-020-02925-x

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