 The structure of these bacterial microtubules is similar to that of eukaryotic microtubules, consisting of a hollow tube of protofilaments assembled from heterodimers of bacterial tubulin A (BtubA) and bacterial tubulin B (BtubB).Both BtubA and BtubB share features of both α- and β-tubulin.Unlike eukaryotic microtubules, bacterial microtubules do not require chaperones to fold.