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DaniilM
5 days ago
14

Explain how the progression of cells past sequential cell cycle checkpoints and the activity of enzymes such as separase is cont

rolled by interactions between two major groups of regulatory proteins
Biology
1 answer:
-BARSIC- [725]5 days ago
7 0

Answer:

In multicellular organisms, development and maintenance of various tissues, organs, and systems begin from an egg or zygote, with mitotic cell division being crucial. The new cells produced through mitosis are genetically identical to the parent stem cell, which is made possible by intricate regulatory mechanisms ensuring the genomic material’s integrity and proper segregation.

Explanation:

Segurine plays a critical role as it restrains the protease separase; its release prompts the breakdown of the cohesin that binds sister chromatids. This cohesion facilitates chromosomal separation, while the degradation of cyclin leads to the inactivation of CDK1 (cyclin-dependent kinase).

When chromosome alignment fails to satisfy the SAC (spindle assembly checkpoint), non-anchored kinetocores trigger protein recruitment at the checkpoint. This results in forming two distinct complexes which merge to create a mitotic control complex. Consequently, segurin is protected from degradation, preventing separase release and chromosome separation until SAC requirements are fulfilled.

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