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- W1524252622 abstract "In mammalian brain, beta-tubulin occurs as a mixture of four isotypes designated as types I, II, III, and IV. It has been speculated in recent years that the different tubulin isotypes may confer functional diversity to microtubules. In an effort to investigate whether different tubulin isotypes differ in their functional properties we have studied the colchicine binding kinetics of bovine brain tubulin upon removal of the beta III isotype. We found that the removal of the beta III isotype alters the binding kinetics from biphasic to monophasic with the disappearance of the slow phase. The kinetics become biphasic with the reappearance of the slow phase when the beta III-depleted tubulin was mixed with the beta III fraction eluted from the affinity column with 0.5 M NaCl. The analysis of the kinetic data reveals that the tubulin dimers containing beta III bind colchicine at an on-rate constant of 35 M-1 s-1 while those lacking beta III bind at 182 M-1 s-1. Our results strongly suggest that the beta-subunit plays a very important role in the interaction of tubulin with colchicine." @default.
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- W1524252622 date "1991-01-01" @default.
- W1524252622 modified "2023-09-30" @default.
- W1524252622 title "Distinct colchicine binding kinetics of bovine brain tubulin lacking the type III isotype of beta-tubulin" @default.
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- W1524252622 doi "https://doi.org/10.1016/s0021-9258(18)52349-8" @default.
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