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Describe the roles of checkpoints, cyclin, Cdk, and MPF in the cell cycle control system.
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» Unit 2: The Cell / Chapter 12: The Cell Cycle
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Check points aaaarree critical control poooiiinttss. Kinda like the street light equivalent to cells. Red light means stop! Green means go! So on and so forth. o_o Cyclin..is a protein that alternates in concentrations and what a kinase must be attached to in order to be active! Cdk is also called the Cyclindependent kinases. The kinases that have this requirement aid the name o.o.. And and and..MPF..is a sound I make when I'm tackled. No..Really..MPF is the fluctuation rate of the Cdk complex. ^__^ All of these control enzyme activity, reproduction aka mitosis or meiosis, and digestion and and..Other cell jobs. Hence the name…The Cell Cycle control system! -Insert cheesy hero music here!-
Cyclin-A regulatory protein whose concentration fluctuates cyclically.
mpf is requred for cell to move from late interphase to mitosis mpf stimulate fragmentation of the nucler envalope by phosphorlation of various proteins. It also sctivates the breakdown of cyclin dropping the cyclin and mpf levals during mitosis.
The checkpoints in the cell cycle is a control point where stop and go signals can regulate the cycle. The're three major checkpoints in the cell cycle G 1, G 2, and M Phases. G 1 is usually the "restriction point" in other words, if you get past this point you'll probably go ahead to the S, G 2, and M phases and well, divide. Some "kinases" proteins give the "go-ahead" signal to the G 1 and G 2 checkpoints. In order to do that though, the kinase must be attached to a cylclin- a protein; with a cyclically fluctuating concentration in the cell. These kinases are called, cyclindependent kinases, or for short Cdk. The Cdk's activity rises and falls with the change in concentration of the cyclin partner.Well, MPF is the cyclinCdk complex that was discovered first.MPF stands for " maturation-promoting factor," but its mostly known as " M- phase-promoting factor" why? because it triggers the cell's passage past the G 2 chechpoint into M phase. MPF acts as both a direct kinases and a indirect.It also contributes to molecular events.
The check points role is to stop cell reproduction if we have to much, or give the alls clear if more cells are needed. Cyclin is bacicly a secondary signal.Cdk if I understand correctliy is a signal receptore.
The checkpoints in the cell cycle are to control the growth of cells. The checkpoints in a cell are the G1, G2, and M phase checkpoints. During any of these phases the cell could immediatly stop replicating. Lets see…. Well the cell basically knows when to stop when the chromosomes in the cell do not connect to the mitotic spindle they then produce chemicals (one of them i believe is MPF) to stop untill given further orders. Cyclin is a regulatory protien that activates the kinases that in turn drive the cell cycle
Checkpoints in the cell cycle are "critical control points where stop and go-ahead signals can regulate the cycle." Cyclin is a protein, that cyclically flutuates its concentration in the cell. Cdk rises and falls with the concentration of its cyclin partner. MPF is a cdk complex, it was discovered first. MDF stands for " maturation-promoting factor" or also known as "M-phase-promoting factor". MDF triggers the cells passage past the G2 checkpoint into M-phase.
Checkpoints are there to tell a cell when a certain procedure is done with and to go on to a new one to a new cycle. Cyclin is needed to activate protein kinases wich are called Cdk(cyclin-dependant kinases) they controle the speed of a molecuels and the cell cycle by turning protenis off or on.MPF triggers the cell's passage past the G2 checkpoint into the M phase.
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