Abstract
Flavour of ripe Alphonso mango is invariably dominated by the de novo appearance of lactones and furanones during ripening. Of these, furanones comprising furaneol (4-hydroxy-2,5-dimethyl-3(2H)-furanone) and mesifuran (2,5-dimethyl-4-methoxy-3(2H)-furanone) are of particular importance due to their sweet, fruity caramel-like flavour characters and low odour detection thresholds. We isolated a 1056 bp complete open reading frame of a cDNA encoding S-adenosyl-l-methionine-dependent O-methyltransferase from Alphonso mango. The recombinantly expressed enzyme, MiOMTS showed substrate specificity towards furaneol and protocatechuic aldehyde synthesizing mesifuran and vanillin, respectively, in an in vitro assay reaction. A semi-quantitative PCR analysis showed fruit-specific expression of MiOMTS transcripts. Quantitative real-time PCR displayed ripening-related expression pattern of MiOMTS in both pulp and skin of Alphonso mango. Also, early and significantly enhanced accumulation of its transcripts was detected in pulp and skin of ethylene-treated fruits. Ripening-related and fruit-specific expression profile of MiOMTS and substrate specificity towards furaneol is a suggestive of its involvement in the synthesis of mesifuran in Alphonso mango. Moreover, a significant trigger in the expression of MiOMTS transcripts in ethylene-treated fruits point towards the transcriptional regulation of mesifuran biosynthesis by ethylene.
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Acknowledgments
H.G.C., P.S.O. and A.B.D. thank CSIR for research fellowships. We are thankful to Dr. Balasaheb Sawant Konkan Agriculture University staff for the field support. A kind help by Prof. Sanjeev Galande, IISER, Pune, India to carry out real-time PCR is thankfully acknowledged. The work was funded by the Council of Scientific and Industrial Research, New Delhi, India under Project CSC0133 (FUN HEALTH) to CSIR-NCL.
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Provisional patent application related to this manuscript with the “Organization as applicant” and “Authors as inventors” has been filed with application number 1795/DEL/2015. No other competing interests exist.
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Chidley, H.G., Oak, P.S., Deshpande, A.B. et al. Molecular Cloning and Characterization of O-Methyltransferase from Mango Fruit (Mangifera indica cv. Alphonso). Mol Biotechnol 58, 340–350 (2016). https://doi.org/10.1007/s12033-016-9933-2
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DOI: https://doi.org/10.1007/s12033-016-9933-2