Ion-Pair Reversed-Phase HPLC Identification of Sugar Nucleotides in Cell Free Extracts ofStreptomyces Griseus

Development of a NACE method for simultaneous measurement of three adenosine monophosphate isomers in biomimicking prebiotic synthesis without sample pretreatment

A practical NACE method was developed for simultaneous determination of three adenosine monophosphate (AMP) isomers. Separation of three AMP isomers was achieved using 200 mM Tris/H(3)BO(3) in acetontrile/water (2:1 v/v) at pH* 10.0 as the running buffer and +25 kV as the applied voltage over a bare fused-silica capillary of 50 microm id x 375 microm od x 54.5 cm (46 cm to the detector window). At 260 nm, the calibration curves were linear in the range of 1-100 microg/mL. The detection limits were less than 0.70 microg/mL. The recovery ranged from 94.5 to 106.4%. The intraday RSDs of the migration times were between 2.1 and 3.0%. The developed NACE method has been successfully applied for the determination of three AMP isomers in the real samples of biomimicking prebiotic synthesis reaction between N-(O,O-diisopropyl) phosphoryl amino acid and adenosine.

Enzymatic conversion of glucose to UDP-4-keto-6-deoxyglucose in Streptomyces spp

All of the 2,6-dideoxy sugars contained within the structure of chromomycin A3 are derived from D-glucose. Enzyme assays were used to confirm the presence of hexokinase, phosphoglucomutase, UDPG pyrophosphorylase (UDPGP), and UDPG oxidoreductase (UDPGO), all of which are involved in the pathway of glucose activation and conversion into 2,6-dideoxyhexoses during chromomycin biosynthesis. Levels of the four enzymes in Streptomyces spp. cell extracts were correlated with the production of chromomycins. The pathway of sugar activation in Streptomyces spp. involves glucose 6-phosphorylation by hexokinase, isomerization to G-1-P catalyzed by phosphoglucomutase, synthesis of UDPG catalyzed by UDPGP, and formation of UDP-4-keto-6-deoxyglucose by UDPGO.