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• W1503479426 abstract "Vertebrate β‐tubulins have been classified into six classes on the basis of their C‐terminal sequences [(1987) J. Cell Biol. 105, 1707‐1720]. In particular, the sequences starting at residue 430 differ between isotypes of the same animal but are conserved between species. We extend this analysis and show that there are three ‘hot spots’, at residues 35, 55–57 and 124 which exhibit intra‐species heterogeneity but inter‐species conservation. There is a remarkable correlation between the identity of these residues and the C‐terminal sequences, and suggests that the vertebrate β‐tubulins fall into three broad types. This correlation extends to those non‐vertebrate organisms which have the Type 1 C‐terminal sequence. We propose that these three ‘hot spots’ and the C‐terminal peptide interact in the tertiary structure. We have also noted that the C‐terminal peptide almost always contains a single phenylalanine or tyrosine residue, and that there is a strong correlation between this residue and the amino acids at positions 217/218, in both the vertebrate and non‐vertebrate sequences. We propose that the C‐terminal aromatic amino acid interacts with residues 217/218 in the tertiary structure. Analysis of conditions which stabilise microtubules and/or lower the steady state critical concentration strongly suggests that these two sets of coordinated amino acid substitutions are directly involved in effecting the conformational change associated with GTP hydrolysis which results in dynamic instability. We propose that there is an interaction between the highly acidic sequence between residue 430 and the aromatic amino acid (termed peptide A) and conserved basic amino acids located close to the ‘hot spots’. We suggest that this interaction is altered in response to the assembly‐dependent GTP hydrolysis, with the consequential increase in the subunit dissociation rate constant." @default.
• W1503479426 created "2016-06-24" @default.
• W1503479426 creator A5024600536 @default.
• W1503479426 creator A5056176519 @default.
• W1503479426 date "1990-10-01" @default.
• W1503479426 modified "2023-10-16" @default.
• W1503479426 title "Analysis of β‐tubulin sequences reveals highly conserved, coordinated amino acid substitutions" @default.
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