Molecular Characterization of Aquaglyceroporine: A Novel Mu-tation in LmAQP1 from Leishmania major (MRHO/IR/75/ER)

Abstract

Background: The first line treatment for cutaneous leishmaniasis is pentavalent antimony such as sodium stibogluconate (pentostam) and meglumine antimonite (glucantime). One of the most important ways to uptake the drug is by a transmembrane protein, called aquaglyceroporin encoded by Aquaglyceroprotein1 (LmAQP1). In this study, molecular characterization of LmAQP1 was reported.

Methods: Leishmania major (MRHO/IR/75/ER) promastigotes were cultured, and then DNA extraction and RNA extraction were done and followed by cDNA synthesis. Amplicons resulted from PCR and RT-PCR using specific primers were purified and sequenced. Molecular characterization was done by bioinformatically software such as BLST, ClustalW2, and RMSD.

Results: Amplicons resulted from PCR and RT-PCR showed equal size in length. BLASTn analysis showed a point nucleotide change in LmAQP1 gene that encoded 282-amino-acid long protein with a mutation at position 154 including replacement of alanine by threonine. The observed mutation in the interested gene was assessed using the above-mentioned software. The mentioned gene was submitted at GenBank, NCBI with accession number of KU514052.

Conclusion: The functional prediction of the protein encoded from LmAQP1 showed that the mentioned mutation could not affect the three-dimension structure, but it may modify the drug uptake potential of this important channel. Based on from LmAQP1 role, it seems to be an appropriate candidate for drug development. According to search through internet, this is the first report of LmAQP1 from L. major (MRHO/IR/75/ER).