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TitleThe structure of the complex between α-tubulin, TBCE and TBCB reveals a tubulin dimer dissociation mechanism.
Journal, issue, pagesJ Cell Sci, Vol. 128, Issue 9, Page 1824-1834, Year 2015
Publish dateMay 1, 2015
AuthorsMarina Serna / Gerardo Carranza / Jaime Martín-Benito / Robert Janowski / Albert Canals / Miquel Coll / Juan Carlos Zabala / José María Valpuesta /
PubMed AbstractTubulin proteostasis is regulated by a group of molecular chaperones termed tubulin cofactors (TBC). Whereas tubulin heterodimer formation is well-characterized biochemically, its dissociation ...Tubulin proteostasis is regulated by a group of molecular chaperones termed tubulin cofactors (TBC). Whereas tubulin heterodimer formation is well-characterized biochemically, its dissociation pathway is not clearly understood. Here, we carried out biochemical assays to dissect the role of the human TBCE and TBCB chaperones in α-tubulin-β-tubulin dissociation. We used electron microscopy and image processing to determine the three-dimensional structure of the human TBCE, TBCB and α-tubulin (αEB) complex, which is formed upon α-tubulin-β-tubulin heterodimer dissociation by the two chaperones. Docking the atomic structures of domains of these proteins, including the TBCE UBL domain, as we determined by X-ray crystallography, allowed description of the molecular architecture of the αEB complex. We found that heterodimer dissociation is an energy-independent process that takes place through a disruption of the α-tubulin-β-tubulin interface that is caused by a steric interaction between β-tubulin and the TBCE cytoskeleton-associated protein glycine-rich (CAP-Gly) and leucine-rich repeat (LRR) domains. The protruding arrangement of chaperone ubiquitin-like (UBL) domains in the αEB complex suggests that there is a direct interaction of this complex with the proteasome, thus mediating α-tubulin degradation.
External linksJ Cell Sci / PubMed:25908846
MethodsEM (single particle) / X-ray diffraction
Resolution1.45 - 21.0 Å
Structure data

EMDB-2447:
Electron microscopy of the complex formed by chaperones TBCE and TBCB and alpha-tubulin
Method: EM (single particle) / Resolution: 21.0 Å

PDB-4icu:
Ubiquitin-like domain of human tubulin folding cofactor E - crystal from A
Method: X-RAY DIFFRACTION / Resolution: 2.4 Å

PDB-4icv:
Ubiquitin-like domain of human tubulin folding cofactor E - crystal form B
Method: X-RAY DIFFRACTION / Resolution: 1.45 Å

Chemicals

ChemComp-HOH:
WATER / Water

ChemComp-PR:
PRASEODYMIUM ION / Praseodymium

Source
  • homo sapiens (human)
  • Bos taurus (cattle)
KeywordsCHAPERONE / Ubiquitin-like domain / tubulin folding cofactor / alpha tubulin / tubulin folding cofactor B

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