title: Phosphorylation of ATP-citrate lyase by nucleoside diphosphate kinase.
abstract: Rat liver nucleoside diphosphate kinase (NDPK) and PC12 cell cytosol were used to determine whether NDPK could function as a protein kinase. NDPK was phosphorylated on its catalytic histidine using [gamma-32P]ATP, and the phosphorylated NDPK separated from [gamma-32P]ATP. The addition of phosphorylated NDPK to dialyzed PC12 cell cytosol resulted in the phosphorylation of a protein with a subunit molecular mass of about 120 kDa. This phosphorylation appeared to occur by a direct transfer of a phosphoryl group from the catalytic histidine of NDPK to a histidine on the 120-kDa protein. The 120-kDa protein was partially purified and shown by peptide sequencing to be ATP-citrate lyase. ATP-citrate lyase is the primary source of cytosolic acetyl-CoA. NDPK phosphorylated the histidine at the catalytic site of ATP-citrate lyase. This histidine can also be phosphorylated by ATP, and its phosphorylation is the first step in the conversion of citrate and CoA to oxaloacetate and acetyl-CoA by ATP-citrate lyase. The level of phosphorylation of PC12 cell ATP-citrate lyase by phosphorylated NDPK was comparable with that by ATP. Thus, in addition to its nucleoside diphosphate kinase activity, NDPK can function as a protein kinase.
authors.affiliation: Laboratory of Biochemistry, NCI, National Institutes of Health, Bethesda, Maryland 20892-4255, USA.
authors.forename: P D
authors.initials: PD
authors.lastname: Wagner
authors.forename: N D
authors.initials: ND
authors.lastname: Vu
mesh_terms: D001275:ATP Citrate (pro-S)-Lyase / Q000302:isolation & purification / Q000378:metabolism*; D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D002850:Chromatography, Gel; D002852:Chromatography, Ion Exchange; D003600:Cytosol / Q000201:enzymology; D004591:Electrophoresis, Polyacrylamide Gel; D008099:Liver / Q000201:enzymology*; D008970:Molecular Weight; D009701:Nucleoside-Diphosphate Kinase / Q000378:metabolism*; D016716:PC12 Cells; D010750:Phosphoproteins / Q000302:isolation & purification / Q000378:metabolism*; D010761:Phosphorus Radioisotopes; D010766:Phosphorylation; D011494:Protein Kinases / Q000378:metabolism*; D051381:Rats
chemical_list: D010750:Phosphoproteins; D010761:Phosphorus Radioisotopes; D000255:Adenosine Triphosphate; D001275:ATP Citrate (pro-S)-Lyase; D011494:Protein Kinases; D009701:Nucleoside-Diphosphate Kinase