Chromosomes separate abruptly during anaphase of mitosis, but how this switch-like behaviour is achieved is unclear. Cohesion between sister chromatids is dissolved by the protease separase, which is held in check by securin. In this paper, a positive feedback loop regulating the ubiquitination and destruction of securin is proposed to make anaphase more switch-like.
- Liam J. Holt
- Andrew N. Krutchinsky
- David O. Morgan