1. Properties and affinity purification of the mixed-type putative acetylcholine receptor from wild and a mutant strain of house flies
- Author
-
H L Tripathi, Richard D. O'Brien, and R.K. Tripathi
- Subjects
Chemistry ,Decamethonium Compounds ,Sodium ,Mutant ,Biophysics ,chemistry.chemical_element ,Biochemistry ,Molecular biology ,Chromatography, Affinity ,Molecular Weight ,Sedimentation coefficient ,Kinetics ,Electrophoresis ,Decamethonium ,Isoelectric point ,Affinity chromatography ,Houseflies ,Mutation ,medicine ,Animals ,Receptors, Cholinergic ,Molecular Biology ,Acetylcholine receptor ,medicine.drug - Abstract
Binding of decamethonium to a soluble preparation from house fly head (either wild or a mutant strain) showed a single kind of binding with values for wild strain of Kd = 0.095 micrometers and Bmax = 0.22 nmol/mg protein. The mutant had a four-fold greater affinity and a seven-fold lesser amount. The binding was blocked by both nicotinic and muscarinic drugs. The decamethonium binding migrated in sucrose gradients as a single peak, with sedimentation coefficient s20,w = 12.5 S and therefore a molecular weight of 342 000. Purification by affinity chromatography was achieved with only partial loss of activity, andthe purified material demonstrated a single band on analytical disc gel electrophoresis. Electrophoresis in sodium dodecyl sulphate gels showed two subunits of molecular wegiths 94 000 and 64 000. Both subunits had an isoelectric point of 4.8.
- Published
- 1979
- Full Text
- View/download PDF