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TitleStructure of blood cell-specific tubulin and demonstration of dimer spacing compaction in a single protofilament.
Journal, issue, pagesJ Biol Chem, Page 108132, Year 2024
Publish dateDec 24, 2024
AuthorsFelipe Montecinos / Elif Eren / Norman R Watts / Dan L Sackett / Paul T Wingfield /
PubMed AbstractMicrotubule (MT) function plasticity originates from its composition of α- and β-tubulin isotypes and the post-translational modifications of both subunits. Aspects such as MT assembly dynamics, ...Microtubule (MT) function plasticity originates from its composition of α- and β-tubulin isotypes and the post-translational modifications of both subunits. Aspects such as MT assembly dynamics, structure, and anticancer drug binding can be modulated by αβ-tubulin heterogeneity. However, the exact molecular mechanism regulating these aspects is only partially understood. A recent insight is the discovery of expansion and compaction of the MT lattice, which can occur via fine modulation of dimer longitudinal spacing mediated by GTP hydrolysis, taxol binding, protein binding, or isotype composition. Here, we report the first structure of the blood cell-specific α1/β1-tubulin isolated from the marginal band of chicken erythrocytes (ChET) determined to a resolution of 3.2 Å by cryo-EM. We show that ChET rings induced with Cryptophycin-52 (Cp-52) are smaller in diameter than HeLa tubulin (HeLaT) rings induced with Cp-52 and composed of the same number of heterodimers. We observe compacted interdimer and intradimer curved protofilament interfaces, characterized by shorter distances between ChET subunits and accompanied by conformational changes in the β-tubulin subunit. The compacted ChET interdimer interface brings more residues near the Cp-52 binding site. We measured the Cp-52 apparent binding affinities of ChET and HeLaT by mass photometry, observing small differences, and detected the intermediates of the ring assembly reaction. These findings demonstrate that compaction/expansion of dimer spacing can occur in a single protofilament context and that the subtle structural differences between tubulin isotypes can modulate tubulin small molecule binding.
External linksJ Biol Chem / PubMed:39725029
MethodsEM (single particle)
Resolution3.2 - 3.52 Å
Structure data

45263

9c6r

EMDB-45263, PDB-9c6r:
Blood cell-specific tubulin in complex with Cryptophycin-52
Method: EM (single particle) / Resolution: 3.2 Å

45265

9c6s

EMDB-45265, PDB-9c6s:
18-mer blood cell-specific tubulin in complex with Cryptophycin-52
Method: EM (single particle) / Resolution: 3.52 Å

Chemicals

ChemComp-GTP:
GUANOSINE-5'-TRIPHOSPHATE / GTP, energy-carrying molecule*YM

ChemComp-YGY:
Cryptophycin 52

ChemComp-GDP:
GUANOSINE-5'-DIPHOSPHATE / GDP, energy-carrying molecule*YM

Source
  • gallus gallus (chicken)
KeywordsCELL CYCLE / Tubulin Beta-6 chain / TBB6_CHICK / TUBB1 / Ring C8 / Hematopoietic isotype Cryptophycin / Anticancer / GTPase / Cytoskeleton / Cryptophycin-52 / Hematopoietic / Beta-6 tubulin chain / Class VI

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