Highlighting Aglycone-dependent Glycosylation Aspects in Caryophyllaceae Saponins by a Simplex Simulation Approach

Asma       Hammami; Muhammad       Farman; Nabil       Semmar

doi:10.2174/1568026621666210114153216

Abstract

Background: Saponin metabolism shows high structural variability due to the diversity of aglycones and glycosylations (Gly). Although they represent a potential source of drug design, their metabolism remains misunderstood yet due to insufficient investments in analytical methods.

Aims: Bibliographic structural data offer a wide field for extensive statistical analysis, highlighting mechanistic orders governing metabolic diversity. This work presents an original simulation method based on simplex rule for highlighting regulatory mechanisms of metabolism from categorical structural data.

Methods: Simulation was applied on a set of 231 saponins of the Caryophyllaceae plant family initially affiliated to four aglycone types: gypsogenin (Gyp), quillaic acid (QA), gypsogenic acid (GA), and 16-OH-gypsogenic acid (16-OH-GA). Molecules were initially characterized by relative glycosylation levels of different carbons. Simplex approach was applied by combining saponins of the four aglycone groups using a complete set of N gradual weightings between structural groups. In silico combinations were applied by randomly sampling representative saponins from the four groups conforming to their weights given by mixture design. Gly profiles of sampled saponins were averaged to calculate a barycentric molecular profile for each mixture. With N mixtures, N barycentric molecules were iteratively calculated by bootstrap, leading to smoothed data from which Gly trends between carbons were highlighted.

Results: Sequential, competing and cooperative Gly trends were highlighted according to the types of aglycones, attached saccharides and positions of substituted carbons. Such various conditional Gly trends seemed to be linked to multiple factors, including steric effects, regio-selectivity, enzymatic specificity and enzymatic promiscuity. These simulated results could be helpfully useful in chemical synthesis and drug design.

Conclusion: These simulated results could usefully help for chemical syntheses and drug design.

Keywords: Computational chemistry, Mixture design, Metabolism, Regioselectivity, Enzymatic competitions, Chemical substitutions.

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Graphical Abstract

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DOI https://dx.doi.org/10.2174/1568026621666210114153216	Print ISSN 1568-0266
Publisher Name Bentham Science Publisher	Online ISSN 1873-4294

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