Subunits that make up microtubules. When beta tubulin (in a tubulin heterodimer with alpha tubulin) binds GTP, it is able to extend the microtubule protofilament until GTP hydrolysis into GDP catches up with the GTP.
Subunits that make up microtubules. When beta tubulin (in a tubulin heterodimer with alpha tubulin) binds GTP, it is able to extend the microtubule protofilament until GTP hydrolysis into GDP catches up with the GTP.