Cell Cycle Control

Cyclins

  • G1/S cyclins
    • Activate Cdks in late G1
    • Help promote passage through restriction point/start in late G1, resulting in commitment to cell cycle entry
  • S cyclins
    • Bind CDKs soon after progression through start
    • Help stimulate chromosome duplication
  • M cyclins
    • Activate Cdks that stimulate entry into mitosis at G2/M checkpoint

A separate regulatory protein APC/C intiates metaphase-anaphase transition


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