Proteomic analysis of mouse kidney peroxisomes: identification of RP2p as a peroxisomal nudix hydrolase with acyl-CoA diphosphatase activity.
Proteomic analysis of mouse kidney peroxisomes resulted in the identification of a novel nudix hydrolase designated RP2p, which is encoded by the D7RP2e gene. RP2p consists of 357 amino acids and contains two conserved domains: a nudix hydrolase domain and a CoA-binding domain. In addition, a PTS (peroxisomal targeting signal) type 1 (Ala-His-Leu) was found at the C-terminus. Analysis of the enzyme characteristics revealed that RP2p is a CoA diphosphatase with activity towards CoA, oxidized CoA and a wide range of CoA esters, including choloyl-CoA and branched-chain fatty-acyl-CoA esters. The enzymatic properties of RP2p indicate that at low substrate concentrations medium and long-chain fatty-acyl-CoA esters are the primary substrates. Enzyme activity was optimal at pH 9 or above, and required the presence of Mg2+ or Mn2+ ions. Subcellular fractionation studies revealed that all CoA diphosphatase activity in mouse kidney is restricted to peroxisomes.
Ofman
Rob
R
Department of Clinical Chemistry, Emma Children's Hospital, Academic Medical Center, University of Amsterdam, P.O. Box 22700, 1100 DE, Amsterdam, The Netherlands.
Speijer
Dave
D
Leen
René
R
Wanders
Ronald J A
RJ
D000214:Acyl Coenzyme A / Q000378:metabolism*; D000595:Amino Acid Sequence; D000818:Animals; D019204:GTP-Binding Proteins; D007668:Kidney / Q000166:cytology*; D008297:Male; D008565:Membrane Proteins; D051379:Mice; D020675:Peroxisomes / Q000201:enzymology* / Q000378:metabolism; D040901:Proteomics; D011755:Pyrophosphatases / Q000737:chemistry / Q000378:metabolism*; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity; D000096964:Nudix Hydrolases
D000214:Acyl Coenzyme A; D019204:GTP-Binding Proteins; D008565:Membrane Proteins; D011755:Pyrophosphatases; D000096964:Nudix Hydrolases; C508759:RP2 protein, mouse