title: Modification of the F0 portion of the H+-translocating adenosinetriphosphatase complex of Escherichia coli by the water-soluble carbodiimide 1-ethyl-3-[3-(dimethylamino)propyl]carbodiimide and effect on the proton channeling function.
abstract: 1-Ethyl-3-[3-(dimethylamino)propyl]carbodiimide (EDC), a water-soluble carbodiimide, inhibited ECF1-F0 ATPase activity and proton translocation through F0 when reacted with Escherichia coli membrane vesicles. The site of modification was found to be in subunit c of the F0 portion of the enzyme but did not involve Asp-61, the site labeled by the hydrophobic carbodiimide dicyclohexylcarbodiimide (DCCD). EDC was not covalently incorporated into subunit c in contrast to DCCD. Instead, EDC promoted a cross-link between the C-terminal carboxyl group (Ala-79) and a near-neighbor phosphatidylethanolamine as evidenced by fragmentation of subunit c with cyanogen bromide followed by high-pressure liquid chromatography and thin-layer chromatography.
mesh_terms: D002234:Carbodiimides / Q000494:pharmacology*; D002250:Carbon Radioisotopes; D003488:Cyanogen Bromide; D004024:Dicyclohexylcarbodiimide / Q000494:pharmacology; D004926:Escherichia coli / Q000201:enzymology*; D005022:Ethyldimethylaminopropyl Carbodiimide / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D046911:Macromolecular Substances; D010446:Peptide Fragments / Q000032:analysis; D011485:Protein Binding; D006180:Proton-Translocating ATPases / Q000378:metabolism*; D013050:Spectrometry, Fluorescence
chemical_list: D002234:Carbodiimides; D002250:Carbon Radioisotopes; D046911:Macromolecular Substances; D010446:Peptide Fragments; D004024:Dicyclohexylcarbodiimide; D006180:Proton-Translocating ATPases; D003488:Cyanogen Bromide; D005022:Ethyldimethylaminopropyl Carbodiimide