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Nat Struct Mol Biol. October 23, 2011; 18 (11): 1250-8.

Tubulin tyrosine ligase structure reveals adaptation of an ancient fold to bind and modify tubulin.

Szyk A , Deaconescu AM , Piszczek G , Roll-Mecak A .

Tubulin tyrosine ligase (TTL) catalyzes the post-translational C-terminal tyrosination of α-tubulin. Tyrosination regulates recruitment of microtubule-interacting proteins. TTL is essential. Its loss causes morphogenic abnormalities and is associated with cancers of poor prognosis. We present the first crystal structure of TTL (from Xenopus tropicalis), defining the structural scaffold upon which the diverse TTL-like family of tubulin-modifying enzymes is built. TTL recognizes tubulin using a bipartite strategy. It engages the tubulin tail through low-affinity, high-specificity interactions, and co-opts what is otherwise a homo-oligomerization interface in structurally related ATP grasp-fold enzymes to form a tight hetero-oligomeric complex with the tubulin body. Small-angle X-ray scattering and functional analyses reveal that TTL forms an elongated complex with the tubulin dimer and prevents its incorporation into microtubules by capping the tubulin longitudinal interface, possibly modulating the partition of tubulin between monomeric and polymeric forms.

PubMed ID: 22020298
PMC ID: PMC3342691
Article link: Nat Struct Mol Biol.
Grant support: ZIA NS003122-01 NINDS NIH HHS , ZIA NS003122-01 Intramural NIH HHS

Genes referenced: efnb3 mapre3 ttl

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Arce, 1976, Pubmed[+]

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