3TII

Tubulin tyrosine ligase

Summary for 3TII

• Entry DOI: 10.2210/pdb3tii/pdb
• Related: 3TIG 3TIN
• Descriptor: Ttl protein, PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER, MAGNESIUM ION, ... (4 entities in total)
• Functional Keywords: atp-grasp, ligase, tubulin, tyrosination
• Biological source: Xenopus (Silurana) tropicalis (Western clawed frog)
• Total number of polymer chains: 2
• Total formula weight: 88661.60

Authors

Roll-Mecak, A.,Szyk, A.,Deaconescu, A.,Piszczek, G. (deposition date: 2011-08-20, release date: 2011-10-26, Last modification date: 2024-02-28)

Primary citation

Szyk, A.,Deaconescu, A.M.,Piszczek, G.,Roll-Mecak, A.
Tubulin tyrosine ligase structure reveals adaptation of an ancient fold to bind and modify tubulin.
Nat.Struct.Mol.Biol., 18:1250-1258, 2011

PubMed Abstract: 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: 22020298
DOI: 10.1038/nsmb.2148

Experimental method

X-RAY DIFFRACTION (2.5 Å)