Fructose 2,6-bisphosphate binds to its allosteric site on PFK-1, it increases the enzyme’s affinity for its substrate fructose 6-phosphate and reduces its affinity for the allosteric inhibitors ATP and citrate

TLS Online TPP Program

#Id: 8327

#XL - Q Biochemistry

TLS Online TPP Program

#Id: 8326

#XL - Q Biochemistry

The two ends of microfilament polymerize at different rates:

fast-growing end - plus end

slow-growing end - minus end

TLS Online TPP Program

#Id: 8325

#XL - Q Biochemistry

Critical concentration (Cc)

minimal concentration of monomers at which filaments form

TLS Online TPP Program

#Id: 8324

#XL - Q Biochemistry

The rate of addition of monomers is given by

rate constant kon (M–1 sec–1 )

The rate of loss is given by koff (sec–1)

TLS Online TPP Program

#Id: 8323

#XL - Q Biochemistry

TLS Online TPP Program

#Id: 8322

#XL - Q Biochemistry

Steady-state phase

G-actin monomers exchange with subunits at the filament ends, but there is no net change in the total length of filaments.