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That'll vary depending on which tubulin protein you look at, as there are different types, and variation between species as well.

If you don't know which one to look for, take a bovine (cow) or porcine (pig) alpha/beta tubulin.

For the most complete set of data on its structure, find a pdb file (search Google for "pdb" and use the search functions of one of those websites to find tubulin).

For less detailed structure, you can find its "FASTA" sequence. RCSB (find it on Google) will allow you to download the pdb file and the FASTA sequence for any known protein.

You can also find the original paper that described the amino acid sequence - just search Google. If you don't find it on Google, chances are you'll have to pay for it!

If you really don't mind which tubulin you get the structure of, use this one to save some time. It is the bovine (cow/cattle) alpha and beta tubulin monomers. The structure was derived as a dimer, so there are two sequences here. The first one is the beta chain, the second one is the alpha chain.

>1JFF:B|PDBID|CHAIN|SEQUENCE

MREIVHIQAGQCGNQIGAKFWEVISDEHGIDPTGSY HGDSDLQLERINVYYNEAAGNKYVPRAILVDLEPGTM DSVRSGPFGQIFRPDNFVFGQSGAGNNWAKGHYTE GAELVDSVLDVVRKESESCDCLQGFQLTHSLGGGTG SGMGTLLISKIREEYPDRIMNTFSVVPSPKVSDTVVEP YNATLSVHQLVENTDETYCIDNEALYDICFRTLKLTTP TYGDLNHLVSATMSGVTTCLRFPGQLNADLRKLAVNM VPFPRLHFFMPGFAPLTSRGSQQYRALTVPELTQQM FDAKNMMAACDPRHGRYLTVAAVFRGRMSMKEVDE QMLNVQNKNSSYFVEWIPNNVKTAVCDIPPRGLKMS ATFIGNSTAIQELFKRISEQFTAMFRRKAFLHWYTGE GMDEMEFTEAESNMNDLVSEYQQYQDATADEQGEF EEEGEEDEA

>1JFF:A|PDBID|CHAIN|SEQUENCE

MRECISIHVGQAGVQIGNACWELYCLEHGIQPDGQM PSDKTIGGGDDSFNTFFSETGAGKHVPRAVFVDLEPT VIDEVRTGTYRQLFHPEQLITGKEDAANNYARGHYTIG KEIIDLVLDRIRKLADQCTGLQGFSVFHSFGGGTGSGF TSLLMERLSVDYGKKSKLEFSIYPAPQVSTAVVEPYNS ILTTHTTLEHSDCAFMVDNEAIYDICRRNLDIERPTYTN LNRLIGQIVSSITASLRFDGALNVDLTEFQTNLVPYPRG HFPLATYAPVISAEKAYHEQLSVAEITNACFEPANQMV KCDPRHGKYMACCLLYRGDVVPKDVNAAIATIKTKRTI QFVDWCPTGFKVGINYEPPTVVPGGDLAKVQRAVCML SNTTAIAEAWARLDHKFDLMYAKRAFVHWYVGEGME EGEFSEAREDMAALEKDYEEVGVDSVEGEGEEEGEEY

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Q: What is the amino acid structure of tubulin?
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