Biophysical study of the tubulin code: From lattice mechanics and detyrosination to transport sorting and disease

Abstract

Microtubules are dynamic biophysical polymers whose function is encoded by a combinatorial regulatory framework, the “tubulin code”, in which α/β-tubulin isotype composition, post-translational modifications (PTMs), and lattice conformation collectively determine effector recruitment and cellular behavior. Among these PTMs, α-tubulin detyrosination has become a particularly tractable model for biophysical investigation following the identification of its enzymatic machinery. In this review, we summarized progress across six thematic areas: Methodological advances enabling causal investigation of the tubulin code; the conceptual framework of isotype- PTM epistasis; the molecular mechanism and spatial regulation of detyrosination by the vasohibin- SVBP (VASH/SVBP) complex and MATCAP/TMCP family; microtubule lattice mechanics and plus- end dynamics; effector-mediated transport sorting; and pathophysiological consequences in neurological disease, cardiac dysfunction, and cancer. A central insight was that microtubule lattice conformation, expanded (GTP-like) versus compacted (GDP), constitutes a previously unrecognized third axis of the tubulin code. Lattice expansion enhances α-tubulin C-terminal tail (CTT) accessibility and selectively promotes VASH1/SVBP catalytic activity, mechanically gating detyrosination. This state-gated mechanism couples polymer biophysics to downstream transport selectivity, with consequences for axonal differentiation, chromosome segregation, ciliary organization, and cardiac mechanics. Neuronal axonal microtubules maintaining a GTP-like expanded lattice despite being GDP-bound further illustrates lattice conformation as an independent regulatory variable. Nevertheless, no single experimental system has demonstrated this complete causal cascade, from isotype composition through lattice mechanical state and PTM enzyme accessibility to reader recruitment, in an integrated manner. Establishing a unified reconstitution and imaging workflow to validate this cascade, and defining how its breakdown drives disease, stands as the central experimental challenge for tubulin biophysics. Microtubules are not merely structural scaffolds but a dynamic information- processing system whose biophysical logic is only beginning to be deciphered.

Keywords

tubulin code / microtubule lattice conformation / α-tubulin detyrosination / vasohibin / post- translational modification

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