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• W2301522081 abstract "The ATP-dependent resynthesis of tubulin from tyrosine and untyrosinated tubulin was examined to establish the most probable steady-state kinetic mechanism of the tubulin: tyrosine ligase (ADP-forming). Three pair-wise sets of initial rate experiments, involving variation of two substrates pair-wise with the third substrate held at a high (but non-saturating) level, yielded convergent-line data, a behaviour that is diagnostic for sequential mechanisms. Michaelis constants were 14 microM, 1.9 microM and 17 microM for ATP, untyrosinated tubulin and L-tyrosine respectively, and the maximal velocity was 0.2 microM/min. AMP was a competitive inhibitor with respect to ATP, and a non-competitive inhibitor versus either tubulin or tyrosine. Likewise, L-dihydroxyphenylalanine acted competitively relative to tyrosine and non-competitively with respect to either ATP or tubulin. These findings directly support a random sequential mechanism. Product inhibition patterns with ADP were also consistent with this assignment; however, inhibition studies were not practical with either orthophosphate or tyrosinated tubulin because both were very weak inhibitors. Substrate protection of the enzyme against alkylation by N-ethylmaleimide and thermal inactivation, along with evidence of enzyme binding to ATP-Sepharose and tubulin-Sepharose, also supports the idea that this three-substrate enzyme reaction exhibits a random substrate addition pathway." @default.
• W2301522081 created "2016-06-24" @default.
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• W2301522081 date "1992-08-15" @default.
• W2301522081 modified "2023-09-26" @default.
• W2301522081 title "Steady-state kinetic mechanism of bovine brain tubulin: tyrosine ligase" @default.
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• W2301522081 doi "https://doi.org/10.1042/bj2860243" @default.
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