Identification of a putative membrane-interacting domain of CTP:phosphocholine cytidylyltransferase from rat liver.
A putative membrane-interacting domain of CTP:phosphocholine cytidylyltransferase (CT) was identified using two peptide-specific antibodies. One antibody (SA2) was raised against the N-terminus of CT (amino acid residues 1-17) and the other antibody (SA209) against an alpha-helical domain of the enzyme (amino acid residues 247-257). Both antibodies quantitatively immunoprecipitated CT from rat liver cytosol and showed specificity towards CT when octylglucoside extracts of rat liver cytosol were assessed by Western blot analysis. However, further experiments revealed that the antibodies had different characteristics. Whereas the antibody directed against the N-terminus of CT (SA2) did not influence CT/membrane interaction, the new antibody (SA209) against the alpha-helical domain of the enzyme interfered with this interaction. Our results provide experimental evidence that the alpha-helical domain (amino acid residues 228-287) of CT may serve as a membrane-interacting domain.
Wieder
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T
Department of Dermatology, University Medical Center Steglitz, Free University of Berlin, Germany.
Geilen
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CC
Wieprecht
M
M
Becker
A
A
Orfanos
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CE
D000818:Animals; D000906:Antibodies; D001483:Base Sequence; D015153:Blotting, Western; D002462:Cell Membrane / Q000201:enzymology; D019916:Choline-Phosphate Cytidylyltransferase; D003600:Cytosol / Q000201:enzymology; D004797:Enzyme-Linked Immunosorbent Assay; D007700:Kinetics; D008081:Liposomes; D008099:Liver / Q000201:enzymology*; D008969:Molecular Sequence Data; D009713:Nucleotidyltransferases / Q000737:chemistry* / Q000276:immunology / Q000378:metabolism; D019301:Oleic Acid; D009829:Oleic Acids / Q000494:pharmacology; D010455:Peptides / Q000138:chemical synthesis / Q000276:immunology; D051381:Rats
D000906:Antibodies; D008081:Liposomes; D009829:Oleic Acids; D010455:Peptides; D019301:Oleic Acid; D009713:Nucleotidyltransferases; D019916:Choline-Phosphate Cytidylyltransferase