a posttranslational modification of tubulin with potential significance for the regulation of microtubule assembly or function has been revealed by the discovery of an enzyme ( tubulin -- tyrosine ligase ) which can add a tyrosine residue to the alphachain , apparently through peptide bond linkage to a c-terminal glutamate or glutamine .
C0033666
posttranslational modification
C0077598
tubulin