3.6.5.6	GTP + H2O	-	
3.6.5.6	GTP + H2O	GTP-binding proteins from the tubulin family, including alpha,beta-tubulin are key components of the cytoskeleton and play central roles in chromosome segregation and cell division. The nucleotide switch of alpha,beta-tubulin is triggered by GTP hydrolysis and regulates microtubule assembly dynamics. Unassembled tubulin-GTP is in the inactive, curved conformation as in tubulin-GDP rings, and is driven into the straight microtubule conformation by the assembly contacts. Binding of the GTP gamma-phosphate only lowers the free energy difference between the curved and straight forms	
3.6.5.6	additional information	enzyme FtsZDr acts as a GTPase exhibiting polymerization/depolymerization dynamics in vitro and FtsZ ring formation in vivo