Identification of an Important Odorant Precursor in Durian: First Evidence of Ethionine in Plants.

@article{Fischer2019IdentificationOA,
  title={Identification of an Important Odorant Precursor in Durian: First Evidence of Ethionine in Plants.},
  author={Nadine Sarah Fischer and Martin Steinhaus},
  journal={Journal of agricultural and food chemistry},
  year={2019}
}
Based on the following data from literature, we hypothesized the presence of ethionine in durian pulp: 1) the major odorants in terms of quantity as well as odor potency in durian pulp are ethanethiol and its derivatives, 2) genome analysis of durian assigned methionine γ-lyase (MGL), the enzyme that converts methionine to methanethiol, a key role for durian odor formation, 3) MGL accepts not only methionine but also ethionine as substrate. A targeted search by LC-MS/MS allowed us to confirm… 
Comparative Study on Volatile Compounds and Taste Components of Different Durian Cultivars Based on GC-MS, UHPLC, HPAEC-PAD, E-Tongue and E-Nose
In order to comprehensively evaluate the aroma-active substances and taste components of durian, solid-phase microextraction combined with gas chromatography mass spectrometry (SPME/GC-MS),
YALI0C22088g from Yarrowia lipolytica catalyses the conversion of l‐methionine into volatile organic sulfur‐containing compounds
TLDR
Findings reveal the formation mechanism of VOSCs produced directly from l‐Met via the demethiolation pathway in Yarrowia lipolytica, which provides a rationale for engineering the enzymatic conversion of l‐ met into VOSC and thus stimulates the enzyme production of aroma compounds.
Genomic Approaches for Improvement of Tropical Fruits: Fruit Quality, Shelf Life and Nutrient Content
TLDR
Through multi-omics approaches such as genomics, transcriptomics, metabolomics and proteomics, the identification and quantification of transcripts, including non-coding RNAs involved in sugar metabolism, fruit development and ripening, shelf life, and the biotic and abiotic stress that impacts fruit quality were made possible.

References

SHOWING 1-10 OF 16 REFERENCES
Insights into the Key Compounds of Durian (Durio zibethinus L. 'Monthong') Pulp Odor by Odorant Quantitation and Aroma Simulation Experiments.
TLDR
The overall odor of durian pulp could be mimicked by only two compounds, namely, ethyl (2S)-2-methylbutanoate and 1-(ethylsulfanyl)ethane-1-thiol, when combined in their natural concentrations.
The draft genome of tropical fruit durian (Durio zibethinus)
TLDR
The durian genome provides a resource for tropical fruit biology and agronomy and a potential association between ethylene biosynthesis and methionine regeneration via the Yang cycle is suggested.
Characterization of the major odor-active compounds in Thai durian ( Durio zibethinus L. 'Monthong') by aroma extract dilution analysis and headspace gas chromatography-olfactometry.
TLDR
An aroma extract dilution analysis applied on the volatile fraction isolated from Thai durian by solvent extraction and solvent-assisted flavor evaporation resulted in 44 odor-active compounds that could be identified and 24 that had not been reported in durian before, reported for the first time in a natural product.
Durian Fruits Discovered as Superior Folate Sources
TLDR
The tropical fruit durian can be considered as a very rich dietary source of natural folates and may be correlated to the upregulated methionine biosynthesis pathway reported recently.
Volatile sulphur compounds and pathways of l-methionine catabolism in Williopsis yeasts
TLDR
Based on the production of VSCs, the study suggests that the Ehrlich pathway of l-methionine catabolism is operative in W. saturnus yeasts and can be manipulated by adjusting certain nutrient parameters to control VSC production.
Methionine Metabolism: Major Pathways and Enzymes Involved and Strategies for Control and Diversification of Volatile Sulfur Compounds in Cheese
TLDR
An overview of the main VSCs found in cheese, along with the major pathways and key enzymes leading to the formation of methanethiol from methionine, which is subsequently converted into other sulfur-bearing compounds are given.
The Natural Occurrence of Ethionine in Bacteria
TLDR
Ethionine was found in cellular extracts and in the growth media of Escherichia coli, Bacillus megaterium, Pseudomonas aeruginosa, and Aerobacter aerogenes but not in Scenedesmus, Saccharomyces cerevisiae, or bovine lymphosarcoma cells.
Properties of L-methionine gamma-lyase from Pseudomonas ovalis.
TLDR
The distribution of bacterial L-Methionine gamma-lyase was investigated, and Pseudomonas ovalis was found to have the highest activity of enzyme, which was inducibly formed by addition of L-methionines to the medium.
Solvent assisted flavour evaporation – a new and versatile technique for the careful and direct isolation of aroma compounds from complex food matrices
Abstract A compact and versatile distillation unit was developed for the fast and careful isolation of volatiles from complex food matrices. In connection with a high vacuum pump (5×10–3 Pa), the new
Development of stable isotope dilution assays for the quantitation of the food odorants hydrogen sulphide, methanethiol, ethanethiol, and propane-1-thiol and application to durian (Durio zibethinus L.) pulp
Stable isotope dilution assays were developed for the quantitation of the highly volatile odorants hydrogen sulphide, methanethiol, ethanethiol, and propane-1-thiol using sodium (34S)sulphide, sodium
...
...