Abstract
Using chiral-phase HPLC, we determined the stereochemical configuration of the phosphatidylglycerols (PtdGro) synthesized in vitro from 1,2-diacyl-sn-glycero-3-phosphocholine (PtdCho, R configuration) or 1,2-diacyl-sn-glycero-3-phosphoethanolamine (PtdEtn, R configuration) and glycerol by transphosphatidylation with bacterial phospholipase D (PLD). The results obtained with PLD preparations from three Streptomyces strains (S. septatus TH-2, S. halstedii K5, and S. halstedii subsp. scabies K6) and one Actinomadura species were compared with those obtained using cabbage and peanut PLD. The reaction was carried out at 30°C in a biphasic system consisting of diethyl ether and acetate buffer. The resulting PtdGro were then converted into bis(3,5-dinitrophenylurethane) derivatives, which were separated on an (R)-1-(1-naphthyl)ethylamine polymer. In contrast to the cabbage and peanut PLD, which gave equimolar mixtures of the R,S and R,R diastereomers, as previously established, the bacterial PLD yielded diastereomixtures of 30–40% 1,2-diacyl-sn-glycero-3-phospho-1′-sn-glycerol (R,S configuration) and 60–70% 1,2-diacyl-sn-glycero-3-phospho-3′-sn-glycerol (R,R configuration). The highest disproportionation was found for the Streptomyces K6 species. The present study demonstrates that bacterial PLD-catalyzed transphosphatidylation proceeds to a considerable extent stereoselectively to produce PtdGro from PtdCho or PtdEtn and prochiral glycerol, indicating a preference for the sn-3′ position of the glycerol molecule.
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Abbreviations
- DNPU:
-
3,5-dinitrophenylurethane
- GroPCho:
-
glycerophosphocholine
- GroPEtn:
-
glycerophosphoethanolamine
- sn-3,sn-3′ (R,R):
-
1,2-diacyl-sn-glycero-3-phospho-3′-sn-glycerol
- sn-3,sn-1′ (R,S):
-
1,2-diacyl-sn-glycero-3-phospho-1′-sn-glycerol
- GroPGro:
-
glycerophosphoglycerol
- PLD:
-
phospholipase D
- PtdCho:
-
phosphatidylcholine
- PtdEtn:
-
phosphatidylethanolamine
- PtdGro:
-
phosphatidylglycerol
- PtdOH:
-
phosphatidic acid
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Sato, R., Itabashi, Y., Hatanaka, T. et al. Asymmetric in vitro synthesis of diastereomeric phosphatidylglycerols from phosphatidylcholine and glycerol by bacterial phospholipase D. Lipids 39, 1013–1018 (2004). https://doi.org/10.1007/s11745-004-1324-1
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DOI: https://doi.org/10.1007/s11745-004-1324-1