[Demonstration of a microtubule protein (tubulin) in swine parathyroid cytosol].

A cytosolic colchicine-binding protein has been studied in Porcine parathyroid glands. The molecular weight of this protein is 110,000 dalton with a 6 S sedimentation constant. Its colchicine affinity is 1.3 X 10(6) l/mole at 37 degrees C. Polymerization-depolymerization kinetics and vinblastin sulfate-induced precipitation are the same as that of a tubulin.