450 MREIISIHIGQAGIQVGNSCWELYCLEHGIQPDGTMPSDSTVGACHDAFNTFFSETSSGQHVPRAVFLDLEPTVIDEVRTGTYRQLFHPEQLISGKEDAANNFARGHYTVGREIVDTCLERLRKLADNCTGLQGFLVFNAVGGGTGSGLGSLLLERLSVDFGKKSKLGFTIYPSPQVSTAVVEPYNSVLSTHSLLEHTDVVVLLDNEAIYDICRRSLDIERPTYSNLNRLISQTISSLTTSLRFDGAINVDITEFQTNLVPYPRIHFMLSSYAPVISSAKAYHEQFSVPEITTSVFEPSNMMAKCDPRHGKYMACCLMYRGDVVPKDVNTAVAAIKAKRTIQFVDWCPTGFKCGINYQPPSVVPGGDLAKVQRAVCMISNNTAVAEVFSRIDHKFDLMYSKRAFVHWYVGEGMEEGEFSEAREDLAALEKDYEEVGGEGAEDDDEEGDEY TBA1_ARATH TUA1 F13O11.5 Tubulin is the major constituent of microtubules. 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. Tubulin alpha-1 chain TUBA1 At1g64740