Kinesin-13 (End-Binding Proteins)

• Bind and curve the end of the tubulin protofilaments into the GDP-β-tubulin conformation

• Facilitate the removal of terminal tubulin dimers 

• Greatly enhancing the frequency of catastrophes

TLS Online TPP Program

#Id: 10192

#Unit 6. System Physiology – Plant

cZ is thought to be less active and relatively more stable than tZ and iP because of its low affinity for CKX. cZ and its conjugates are more abundant than tZ‐ and iP‐type CKs in Z. mays, O. sativa, chickpea (Cicer arietinum) and a moss (Physcomitrella patens)

TLS Online TPP Program

#Id: 10193

#Unit 6. System Physiology – Plant

DZ appears to be biologically stable because of its resistance to CKX and is generally found in small quantities except for some legumes

TLS Online TPP Program

#Id: 10194

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 10195

#Unit 6. System Physiology – Plant

Cytokinin biosynthesis, catalyzed by isopentenyl transferase (IPT), that adds isopentenyl side chain from DMAPP (dimethylallyl diphosphate) to ATP or ADP

TLS Online TPP Program

#Id: 10196

#Unit 6. System Physiology – Plant

TLS Online TPP Program

#Id: 10197

#Unit 6. System Physiology – Plant

iPRTP or iPRDP is converted to ZTP or ZDP respectively by cytochrome P450 monooxygenase (CYP735A) and converted to zeatin.