TTLL4 encodes the human gene, Tubulin tyrosine ligase like 4. It may also be known as: Tubulin polyglutamylase TTLL4; Tubulin polyglutamylase TTLL4 ; Tubulin--tyrosine ligase-like protein 4; tubulin tyrosine ligase-like family member 4. The encoded protein is an enzyme with an amino acid length of 1199 and a mass of 133.4 kDa. TTLL4 is a member of the Tubulin--tyrosine ligase family. Homologs of this gene exist in other organisms, including: Mouse, Rat, Zebrafish, Frog, Chicken.