Characterization of Early Enzymes Involved in TDP-Aminodideoxypentose Biosynthesis en Route to Indolocarbazole AT2433.
The characterization of TDP-α-D-glucose dehydrogenase (AtmS8), TDP-α-D-glucuronic acid decarboxylase (AtmS9), and TDP-4-keto-α-D-xylose 2,3-dehydratase (AtmS14), involved in Actinomadura melliaura AT2433 aminodideoxypentose biosynthesis, is reported. This study provides the first biochemical evidence that both deoxypentose and deoxyhexose biosynthetic pathways share common strategies for sugar 2,3-dehydration/reduction and implicates the sugar nucleotide base specificity of AtmS14 as a potential mechanism for sugar nucleotide commitment to secondary metabolism. In addition, a re-evaluation of the AtmS9 homologue involved in calicheamicin aminodeoxypentose biosynthesis (CalS9) reveals that CalS9 catalyzes UDP-4-keto-α-D-xylose as the predominant product, rather than UDP-α-D-xylose as previously reported. Cumulatively, this work provides additional fundamental insights regarding the biosynthesis of novel pentoses attached to complex bacterial secondary metabolites.
Pharmaceutical Sciences Division, University of Wisconsin-Madison, 777 Highland Avenue, Madison, WI, 53705, USA.|Glycom A/S, Denmark.
Pauline
P
Peltier-Pain
Center for Pharmaceutical Research and Innovation, Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY, 40536, USA.
Shanteri
S
Singh
Center for Pharmaceutical Research and Innovation, Department of Pharmaceutical Sciences, College of Pharmacy, University of Kentucky, 789 South Limestone Street, Lexington, KY, 40536, USA. jsthorson@uky.edu.
Jon S
JS
Thorson
D002227:Carbazoles / Q000737:chemistry / Q000378:metabolism*; D042843:Glucose 1-Dehydrogenase / Q000737:chemistry / Q000378:metabolism*; D005968:Glutamate Decarboxylase / Q000737:chemistry / Q000378:metabolism*; D006836:Hydro-Lyases / Q000737:chemistry / Q000378:metabolism*; D015394:Molecular Structure; D009702:Nucleoside Diphosphate Sugars / Q000096:biosynthesis*; D066244:Proton Magnetic Resonance Spectroscopy
D002227:Carbazoles; D009702:Nucleoside Diphosphate Sugars; D042843:Glucose 1-Dehydrogenase; D005968:Glutamate Decarboxylase; D006836:Hydro-Lyases
decarboxylases; dehydratases; dehydrogenases; natural products; sugar nucleotides