Syntheses of 2-Keto-3-deoxy- D-xylonate and 2-Keto-3-deoxy-L-arabinonate as stereochemical probes for demonstrating the metabolic promiscuity of sulfolobus solfataricus towards D-xylose and L-arabinose

Robert M. Archer, Sylvain F. Royer, William Mahy, Caroline L. Winn, Michael J. Danson, Steven D. Bull

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17 Citations (Scopus)

Abstract

Practical syntheses of 2-keto-3-deoxy-D-xylonate (D-KDX) and 2-keto-3-deoxy-L-arabinonate (L-KDA) that rely on reaction of the anion of ethyl 2-[(tert-butyldimethylsilyl)oxy]-2-(dimethoxy phosphoryl) acetate with enantiopure glyceraldehyde acetonide, followed by global deprotection of the resultant O-silyl-enol esters, have been developed. This has enabled us to confirm that a 2-keto-3-deoxy-D-gluconate aldolase from the archaeon Sulfolobus solfataricus demonstrates good activity for catalysis of the retro-aldol cleavage of both these enantiomers to afford pyruvate and glycolaldehyde. The stereochemical promiscuity of this aldolase towards these enantiomeric aldol substrates confirms that this organism employs a metabolically promiscuous pathway to catabolise the C5-sugars D-xylose and L-arabinose.
Original languageEnglish
Pages (from-to)2895-2902
Number of pages8
JournalChemistry - A European Journal
Volume19
Issue number8
Early online date11 Jan 2013
DOIs
Publication statusPublished - 18 Feb 2013

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