Enzymes
| UniProtKB help_outline | 2,709 proteins |
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- Name help_outline a CDP-1,2-diacyl-sn-glycerol Identifier CHEBI:58332 Charge -2 Formula C14H17N3O15P2R2 SMILEShelp_outline Nc1ccn([C@@H]2O[C@H](COP([O-])(=O)OP([O-])(=O)OC[C@@H](COC([*])=O)OC([*])=O)[C@@H](O)[C@H]2O)c(=O)n1 2D coordinates Mol file for the small molecule Search links Involved in 19 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H2O Identifier CHEBI:15377 (Beilstein: 3587155; CAS: 7732-18-5) help_outline Charge 0 Formula H2O InChIKeyhelp_outline XLYOFNOQVPJJNP-UHFFFAOYSA-N SMILEShelp_outline [H]O[H] 2D coordinates Mol file for the small molecule Search links Involved in 6,204 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline a 1,2-diacyl-sn-glycero-3-phosphate Identifier CHEBI:58608 Charge -2 Formula C5H5O8PR2 SMILEShelp_outline [O-]P([O-])(=O)OC[C@@H](COC([*])=O)OC([*])=O 2D coordinates Mol file for the small molecule Search links Involved in 139 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline CMP Identifier CHEBI:60377 Charge -2 Formula C9H12N3O8P InChIKeyhelp_outline IERHLVCPSMICTF-XVFCMESISA-L SMILEShelp_outline Nc1ccn([C@@H]2O[C@H](COP([O-])([O-])=O)[C@@H](O)[C@H]2O)c(=O)n1 2D coordinates Mol file for the small molecule Search links Involved in 164 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H+ Identifier CHEBI:15378 Charge 1 Formula H InChIKeyhelp_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILEShelp_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,431 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:15221 | RHEA:15222 | RHEA:15223 | RHEA:15224 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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Isolation and characterization of Escherichia coli strains defective in CDP-diglyceride hydrolase.
Bulawa C.E., Raetz C.R.
CDP-diglyceride, an obligatory intermediate in the biosynthesis of the glycerophospholipids in Escherichia coli, is cleaved in vitro to phosphatidic acid and CMP by a membrane-bound hydrolase. Previous work from our laboratory (Bulawa, C.E., Hermes, J.D., and Raetz, C. R. H. (1983) J. Biol. Chem. ... >> More
CDP-diglyceride, an obligatory intermediate in the biosynthesis of the glycerophospholipids in Escherichia coli, is cleaved in vitro to phosphatidic acid and CMP by a membrane-bound hydrolase. Previous work from our laboratory (Bulawa, C.E., Hermes, J.D., and Raetz, C. R. H. (1983) J. Biol. Chem. 258, 14974-14980) has demonstrated that this enzyme also catalyzes the transfer of CMP from CDP-diglyceride to phosphate and numerous phosphomonoesters. We now report the isolation of E. coli mutants which are defective in CDP-diglyceride hydrolase. These mutations, designated cdh, map at minute 88 between pfkA and tpi. This information permitted the identification of a ColE1 hybrid plasmid, pLC16-4, which causes the overproduction of hydrolase activity. The isolation of deletion and Tn10 insertion mutants at cdh suggests that the hydrolase is nonessential for cell growth. Hydrolase mutants are defective in both CDP-diglyceride hydrolysis and CDP-diglyceride-dependent cytidylylation, indicating that both activities are encoded by the cdh gene. Although previously described as a ribospecific enzyme, we have found that incubation of the partially purified hydrolase with [alpha-32P]dCDP-diglyceride and phosphate yields two products, [32P]dCMP and [alpha-32P]dCDP. That a single enzyme utilizes both CDP- and dCDP-diglyceride is demonstrated by the following. (i) The hydrolysis of [alpha-32P]CDP-diglyceride is inhibited by nonradioactive dCDP-diglyceride and vice versa. (ii) Utilization of both liponucleotides is inhibited by AMP. (iii) Mutants in the cdh gene are defective in both CDP- and dCDP-diglyceride hydrolysis, while cdh clones overproduce both activities. (iv) Hydrolase mutants accumulate both CDP- and dCDP-diglyceride. << Less
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A membrane-bound pyrophosphatase in Escherichia coli catalyzing the hydrolysis of cytidine diphosphate-diglyceride.
Raetz C.R., Hirschberg C.B., Dowhan W., Wickner W.T., Kennedy E.P.
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Chloroform-soluble nucleotides in Escherichia coli. Role of CDP-diglyceride in the enzymatic cytidylylation of phosphomonoester acceptors.
Bulawa C.E., Hermes J.D., Raetz C.R.
CDP-diglyceride, the precursor of all the phospholipids in Escherichia coli, is cleaved in vitro to phosphatidic acid and CMP by a membrane-bound hydrolase. Since the physiological function of CDP-diglyceride hydrolase is unknown, we have explored the possibility that this enzyme acts in vivo as e ... >> More
CDP-diglyceride, the precursor of all the phospholipids in Escherichia coli, is cleaved in vitro to phosphatidic acid and CMP by a membrane-bound hydrolase. Since the physiological function of CDP-diglyceride hydrolase is unknown, we have explored the possibility that this enzyme acts in vivo as either a phosphatidyl- or cytidylyltransferase. To distinguish between these two alternatives, partially purified hydrolase was incubated with CDP-diglyceride in the presence of 50% H218O. Analysis of the reaction products by 31P NMR showed that 18O is incorporated exclusively into CMP, suggesting that the enzyme is a cytidylyltransferase. This conclusion is further supported by the following experimental results: (i) the hydrolase catalyzes the transfer of CMP from CDP-diglyceride to Pi; (ii) numerous phosphomonoesters, such as glycerol 3-phosphate, phosphoserine, and glucose 1-phosphate also function as CMP acceptors, but the corresponding compounds lacking the phosphate residues are not substrates for the enzyme; and (iii) CDP-diglyceride hydrolase exchanges [32P]phosphatidic acid for the phosphatidyl moiety of CDP-diglyceride and 32Pi for the beta-phosphate residue of CDP, indicating the involvement of a novel CMP-enzyme complex. These data suggest a biosynthetic role for CDP-diglyceride hydrolase, and extend the possible functions of CDP-diglyceride in the E. coli envelope. << Less