ID #1311

In our lecture notes, it says that the beta tubulin polypeptide is hydrolyzed, but I have written in another area that the alpha and beta both have binding sites. Does this mean that the beta one is the only one used?

Yes, I don't know if I stated this explicitly, but your observation is right on. Both the alpha and beta subunits of a tubulin dimer have a nucleotide binding site, but when the dimer comes together, it "blocks" the GTP binding site on the alpha subunit, so it never gets hydrolyzed.

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