Tubulin polyglutamylase TTLL5 (TTLL5)

Polyglutamylase which preferentially modifies alpha- tubulin. Involved from the side-chain initiation step of the polyglutamylation response rather than from the elongation step (By similarity).

Needed for CCSAP localization to both spindle and cilia microtubules. Increases the effects of NCOA2 in glucocorticoid receptor-mediated repression and induction and in androgen receptor-mediated induction (PubMed:17116691, PubMed:22493317).