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Displaying TUB Family from Sorghum


The small genome of Arabidopsis contains at least nine expressed beta-tubulin (TUB) genes, in contrast to the large genomes of vertebrate animals, which contain a maximum of seven expressed beta-tubulin genes. In this study, we report the structures of seven new TUB genes (TUB2, TUB3, TUB5, TUB6, TUB7, TUB8, and TUB9) of Arabidopsis. The sequences of TUB1 and TUB4 had been reported previously. Sequence similarities and unique structural features suggest that the nine TUB genes evolved by way of three branches in the plant beta-tubulin gene evolutionary tree. Two genes (TUB2 and TUB3) encode the same beta-tubulin isoform; thus, the nine genes predict eight different beta-tubulins. In contrast to the alpha-tubulin (TUA) genes with their divergent intron patterns, all nine TUB genes contain 2 introns at conserved positions. Noncoding 3' gene-specific hybridization probes have been constructed for all nine TUB genes and used in RNA gel blot analyses to demonstrate that all nine genes are transcribed. Two-dimensional protein immunoblot analyses have resolved at least seven different beta-tubulin isoforms in Arabidopsis, indicating that most, if not all, of the TUB transcripts are translated.

Protein Name
accepted / suggested
Gene Locus Synonym/
Gene Name
Clone in TFome Genome Browser
SbTUB1 Sb01g035360 View in Browser
SbTUB2 Sb02g042210 View in Browser
SbTUB3 Sb03g030910 View in Browser
SbTUB4 Sb03g040940 View in Browser
SbTUB5 Sb04g005380 View in Browser
SbTUB6 Sb04g030550 View in Browser
SbTUB7 Sb05g003900 View in Browser
SbTUB8 Sb06g033820 View in Browser
SbTUB9 Sb07g000420 View in Browser
SbTUB10 Sb08g004000 View in Browser
SbTUB11 Sb09g021590 View in Browser
SbTUB12 Sb09g025430 View in Browser
SbTUB13 Sb09g028330 View in Browser