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- W1551832849 abstract "Microtubule assembly has been studied turbidometrically in supernatant fluids prepared from rat brain by high-speed centrifugation. It was confirmed that assembly occurred in the absence of added GTP. Zinc ions (500 microM, but in the presence of 1 mM EGTA) stimulated assembly under these conditions. Zinc-stimulated assembly produced microtubules with normal characteristics, as judged by electron microscopy, SDS-polyacrylamide gel electrophoresis and inhibition of assembly by fructose-6-phosphate or colchicine. However, microtubules formed in the presence of such zinc concentrations were more stable to cold than controls, although the rate constant for the disassembly reaction was unchanged. Neither the stimulation of assembly by zinc nor the effect on cold stability was affected by trifluoperazine suggesting that a calmodulin-related mechanism is not involved. Microtubule seeds had little effect in the presence of zinc, suggesting that it may be acting on the nucleation phase of the assembly reaction. This was supported by the findings that zinc reduced the critical concentration of brain supernatant necessary for assembly and that zinc did not affect the rate constant for assembly. The results suggest zinc can in some way stabilize microtubules; possible mechanisms are discussed." @default.
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- W1551832849 date "1984-01-01" @default.
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- W1551832849 title "Microtubule assembly in rat brain extracts" @default.
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- W1551832849 doi "https://doi.org/10.1016/0020-711x(84)90236-2" @default.
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