Download MendeleyCryo-EM structure of VASH1-SVBP bound to microtubules.
Li, F., Li, Y., Ye, X., Gao, H., Shi, Z., Luo, X., Rice, L.M., Yu, H.(2020) Elife 9
- PubMed: 32773040
- DOI: https://doi.org/10.7554/eLife.58157
- Primary Citation of Related Structures:
6WSL - PubMed Abstract:
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.
Organizational Affiliation:
Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, United States.
