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• W2013995570 abstract "Turbidity measurements have been used to study the in vitro assembly and disassembly of porcine neurotubules. All measurements were carried out with tubulin with a purity higher than 80%. Tubules formed by in vitro assembly of this protein are so long that the turbidity is insensitive to length and is a function only of the total mass of high molecular weight material. Porcine tubulin shows a critical concentration for assembly of about 0.2 mg/ml under optimal conditions, pH 6.6, 0.1m-2-(N-morpholino)ethane sulfonic acid, 26 to 37 °C. Under these conditions assembly and disassembly are essentially fully reversible in the presence of excess GTP. The kinetics of assembly show an initial lag and initial rates which are strongly temperature dependent. Our samples show a concentration dependence of no more than second order. The apparent activation enthalpy of assembly is 25 kcal/mol; the apparent reaction enthalpy of assembly for the chain propagation step is 21 kcal/mol. Disassembly kinetics show an apparent negative activation enthalpy of −28 kcal/mol. They are independent of tubule length implying a slow activation step followed by rapid depolymerization. At 20 °C, cycles of polymerization and depolymerization show hysteresis effects in the assembly kinetics though not in disassembly rates or final states. This is most easily explained by postulating a slow reversible inactivation at 4 °C of the initiation complex for tubule assembly. Conditions are reported for producing tubulin in a state which cannot assemble in aqueous buffer unless nucleotides are added. GTP, ATP and ADP, but not GDP, are effective in promoting tubule assembly. An adenylate kinase impurity in our preparation may be the cause of this unusual effect. Whether or not it is actually associated with tubulin or tubules is unknown." @default.
• W2013995570 created "2016-06-24" @default.
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• W2013995570 date "1974-11-01" @default.
• W2013995570 modified "2023-10-17" @default.
• W2013995570 title "Turbidimetric studies of the in vitro assembly and disassembly of porcine neurotubules" @default.
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• W2013995570 doi "https://doi.org/10.1016/0022-2836(74)90048-5" @default.
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