Cell localization:Cytoplasm.function:TubµLin is the major constituent of microtubµLes. It binds two moles of GTP, one at an exchangeable site on the beta chain and one at a non-exchangeable site on the alpha-chain.,PTM:Undergoes a tyrosination/detyrosination cycle, the cyclic removal and re-addition of a C-terminal tyrosine residue by the enzymes tubµLin tyrosine carboxypeptidase (TTCP) and tubµLin tyrosine ligase (TTL), respectively.,similarity:Belongs to the tubµLin family.,subunit:Dimer of alpha and beta chains.,