6WSL image
Deposition Date 2020-05-01
Release Date 2020-08-26
Last Version Date 2024-03-06
Entry Detail
PDB ID:
6WSL
Keywords:
Title:
Cryo-EM structure of VASH1-SVBP bound to microtubules
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
3.10 Å
Aggregation State:
FILAMENT
Reconstruction Method:
SINGLE PARTICLE
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Tubulin alpha-1A chain
Gene (Uniprot):TUBA1A
Chain IDs:A, E
Chain Length:451
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Tubulin beta-3 chain
Gene (Uniprot):TUBB3
Chain IDs:B, F
Chain Length:450
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Tubulinyl-Tyr carboxypeptidase 1
Gene (Uniprot):VASH1
Chain IDs:C, G
Chain Length:259
Number of Molecules:2
Biological Source:Homo sapiens
Polymer Type:polypeptide(L)
Molecule:Small vasohibin-binding protein
Gene (Uniprot):SVBP
Chain IDs:D, H
Chain Length:66
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Cryo-EM structure of VASH1-SVBP bound to microtubules.
Elife 9 ? ? (2020)
PMID: 32773040 DOI: 10.7554/eLife.58157

Abstact

The dynamic tyrosination-detyrosination cycle of α-tubulin regulates microtubule functions. Perturbation of this cycle impairs mitosis, neural physiology, and cardiomyocyte contraction. The carboxypeptidases vasohibins 1 and 2 (VASH1 and VASH2), in complex with the small vasohibin-binding protein (SVBP), mediate α-tubulin detyrosination. These enzymes detyrosinate microtubules more efficiently than soluble αβ-tubulin heterodimers. The structural basis for this substrate preference is not understood. Using cryo-electron microscopy (cryo-EM), we have determined the structure of human VASH1-SVBP bound to microtubules. The acidic C-terminal tail of α-tubulin binds to a positively charged groove near the active site of VASH1. VASH1 forms multiple additional contacts with the globular domain of α-tubulin, including contacts with a second α-tubulin in an adjacent protofilament. Simultaneous engagement of two protofilaments by VASH1 can only occur within the microtubule lattice, but not with free αβ heterodimers. These lattice-specific interactions enable preferential detyrosination of microtubules by VASH1.

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Primary Citation of related structures