Cyclin Protein Groups
Cyclin Protein Groups - Related Videos
10:54
Studying Proteolysis of Cyclin B at the Single Cell Level in Whole Cell Populations
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Cited by 2 •
2012
Metaphase to anaphase transition is triggered through anaphase-promoting complex (APC/C)-dependent ubiquitination and subsequent destruction of cyclin B. Here, we established a system which, following pulse-chase labeling, allows monitoring cyclin B proteolysis in entire cell populations and facilitates the detection of interference by the mitotic checkpoint.
08:46
Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
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Cited by 34 •
2015
A streamlined approach to screening for the expression of recombinant membrane proteins in Escherichia coli based on fusion to green fluorescent protein is presented.
02:58
Regulated Protein Degradation
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2020
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells. Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
11:30
Tandem Affinity Purification of Protein Complexes from Eukaryotic Cells
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Cited by 7 •
2017
We describe here a novel, robust, and efficient tandem affinity purification (TAP) method for the expression, isolation, and characterization of protein complexes from eukaryotic cells. This protocol could be utilized for the biochemical characterization of discrete complexes as well as the identification of novel interactors and post-translational modifications that regulate their function.
11:16
Discovering Protein Interactions and Characterizing Protein Function Using HaloTag Technology
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Cited by 11 •
2014
HaloTag technology is a multifunctional technology which has shown significant success in isolation of both small and large protein complexes from mammalian cells. Here we highlight the advantages of this technology compared to existing alternatives and demonstrate its utility to study numerous aspects of protein function inside eukaryotic cells.
FAQs
Cyclin timing depends on two opposing processes: specific cyclins are produced when their activity is needed and later degraded to reduce the associated CDK activity. This changing abundance allows phosphorylation of target proteins to occur during appropriate parts of the cell cycle. Consequently, cells can coordinate DNA replication, mitosis, and the transitions separating these major stages.
G1, S-phase, and mitotic cyclin groups are associated with different stages of cell-cycle progression. Their sequential activity helps connect one transition to the next rather than activating all cell-cycle events simultaneously. Examining which group is present or degraded at a given time therefore helps explain how cells progress from growth-related events through DNA replication and into mitosis.
Cyclins regulate progression by binding and activating cyclin-dependent kinases, or CDKs. The resulting complexes phosphorylate target proteins, changing their activity so that stage-specific cell-cycle events can proceed. This makes CDK activity the functional link between changing cyclin levels and cellular transitions, including the initiation of DNA replication and the progression into mitosis.
Researchers can examine which cyclin groups are produced or degraded and relate those changes to CDK activity and phosphorylation of target proteins. Comparing these patterns across G1, S-phase, and mitotic stages reveals how regulatory timing controls progression. This approach also helps identify disruptions in checkpoints or genome-maintenance processes that may alter normal cell division.
Cyclin regulation provides a framework for studying cell division, cellular growth, developmental processes, and genome maintenance. Because cyclin-CDK activity coordinates stage transitions, changes in that regulation can be examined alongside cell-cycle checkpoints. Such studies help connect molecular timing mechanisms with broader biological outcomes, including how cells preserve orderly progression while undergoing division.
Abnormal cyclin activity can drive uncontrolled cell proliferation by disrupting the regulation that normally coordinates cell-cycle progression. Studying the production, degradation, and CDK activation associated with these groups helps researchers examine how checkpoint control and orderly division become altered. This makes cyclin regulation relevant for understanding the molecular basis of cancer-related growth.