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. 1980 Apr;142(1):262–267. doi: 10.1128/jb.142.1.262-267.1980

Phosphatidylglycerophosphate synthease and phosphatidylserine synthase activites in Clostridium perfringens.

G M Carman, D S Wieczorek
PMCID: PMC293943  PMID: 6246064

Abstract

Cytidine 5'-diphospho (CDP)-1,2-diacyl-sn-glycerol (CDPdiacylglycerol):sn-glycerol-3-phosphate phosphatidyltransferase (EC 2.7.8.5, phosphatidylglycero-P synthase) and CDPdiacylglycerol:L-serine O-phosphatidyltransferase (EC 2.7.8.8, phosphatidylserine synthase) activities were identified in the cell envelope fraction of the gram-positive anaerobe Clostridium perfringens. The association of phosphatidylglycero-P synthase and phosphatidylserine synthase with the cell envelope fraction of cell-free extracts was demonstrated by sucrose density gradient centrifugation, by both activities sedimenting with the 100,000 x g pellet and solubilization of both activities from the 100,000 x g pellet with Triton X-100. The pH optimum for both enzyme activities was 8.0 with tris(hydroxy-methyl)aminomethane-hydrochloride buffer. Phosphatidylglycero-P synthase activity was dependent on magnesium ions (100 mM). Phosphatidylserine synthase activity was dependent on manganese (0.1 mM) or magnesium ions (50 mM). Both enzyme activities were dependent on the addition of the nonionic detergent Triton X-100. Maximum phosphatidylglycero-P synthase and phosphatidylserine synthase activities were obtained when the molar ratio of Triton X-100 to CDP-diacylglycerol was 50:1 and 12:1, respectively. The Km for sn-glycero-3-P in the phosphatidylglycero-P synthase reaction was 0.1 mM. The Km for L-serine in the phosphatidylserine synthase reaction was 0.15 mM. Both enzyme activities were 100% stable for at least 20 min at 60 degrees C.

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Selected References

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