title: Purification and peptide mapping of rat brain choline acetyltransferase.
abstract: Acetyl-CoA:choline O-acetyltransferase (EC 2.3.1.6) has been purified approximately 17,000-fold from rat brain. The purification protocol included acid and NH4SO4 precipitation, followed by chromatography on CM-Sephadex, phenyl-Sepharose, Sephadex G-150, and blue dextran Sepharose. Two peaks of enzyme activity were detected after blue dextran Sepharose chromatography containing an overall yield of approximately 4% of the starting enzyme activity. The final specific activity of the blue dextran fractions was 70 to 80 mumol of acetylcholine formed min-1 mg of protein-1. Sodium dodecyl sulfate electrophoresis of the blue dextran fractions revealed three closely spaced proteins with a molecular weight of approximately 67,000. Tryptic peptide maps were prepared for each of the gel bands and indicated that they contained nearly identical primary structure.
mesh_terms: D000818:Animals; D001921:Brain / Q000201:enzymology*; D002795:Choline O-Acetyltransferase / Q000302:isolation & purification* / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008970:Molecular Weight; D010446:Peptide Fragments / Q000032:analysis; D051381:Rats
chemical_list: D010446:Peptide Fragments; D002795:Choline O-Acetyltransferase