Eur. J. Entomol. 118: 355-363, 2021 | DOI: 10.14411/eje.2021.037

Characterization of the immune induced antimicrobial peptide in Drosophila melanogaster and Drosophila ananassae Original article

Ramachandra Naik MEGHASHREE ORCID..., Kakanahalli NAGARAJ ORCID...*
Department of Applied Zoology, Kuvempu University, Shankaraghatta, Shivamogga, 577451 Karnataka, India; e-mails: meghanaik1992@gmail.com, knagarajv@gmail.com

Insects can recognize invading pathogens and initiate an immune response. Among them, Drosophila has emerged as an invertebrate model for investigating innate immune responses in which antimicrobial peptides play a crucial role. In the present study, immune-induced antimicrobial peptides were characterized in D. melanogaster and D. ananassae using the agar well diffusion method, HPLC, SDS-PAGE and LC-MS/MS after infection with either S. aureus or E. coli. The HPLC revealed two and three differentially induced components, respectively, in D. melanogaster and D. ananassae flies infected with S. aureus and E. coli. The tricine SDS-PAGE analysis also revealed two and five differentially induced proteins, respectively, in D. melanogaster and D. ananassae infected with E. coli. In E. coli infected flies, the ~6 kDa band was produced at higher level. Based on LCMS/MS and Mascot analysis, the peptide was identified as a putative cecropin A-like peptide, and the data suggested that both species of Drosophila have exhibited a clear immune response. The flies were also able to discriminate between bacteria, as this putative cecropin A-like peptide was produced in flies infected with E. coli but not S. aureus.

Keywords: Diptera, Drosophilidae, Drosophila, immune response, antimicrobial peptide, LC-MS/MS, cecropin A, haemolymph

Received: July 3, 2021; Revised: October 28, 2021; Accepted: October 28, 2021; Published online: November 29, 2021  Show citation

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MEGHASHREE, R.N., & NAGARAJ, K. (2021). Characterization of the immune induced antimicrobial peptide in Drosophila melanogaster and Drosophila ananassae . EJE, 118, Article 355-363. https://doi.org/10.14411/eje.2021.037
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