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• W3107210004 abstract "The anaphase-promoting complex/cyclosome (APC/C) is a multi-subunit E3 ubiquitin ligase that plays a major role in the progression of the eukaryotic cycle. This unusual protein complex targets key cell-cycle regulators, such as mitotic cyclins and securins, for degradation via the 26S proteasome by ubiquitination, triggering the metaphase-to-anaphase transition and exit from mitosis. The identification of the complete set of genes encoding subunits of the APC in Arabidopsis suggests that the basic processes controlled by proteolysis mediated by ubiquitin in plants are similar to those of other organisms. However, results from several groups indicate that the APC has other specific functions in the regulation of plant development. The cycle, or cell-division cycle, is that the series of events that happen during a that cause it to divide into two daughter cells. These events include the duplication of its DNA (DNA replication) and a few of its organelles, and subsequently the partitioning of its cytoplasm and other components into two daughter cells during a process called cellular division. In cells with nuclei (eukaryotes), (i.e., animal, plant, fungal, and protist cells), the cycle is split into two main stages: interphase and therefore the mitotic (M) phase (including and cytokinesis). During interphase, the grows, accumulating nutrients needed for mitosis, and replicates its DNA and a few of its organelles. During the mitotic phase, the replicated chromosomes, organelles, and cytoplasm separate into two new daughter cells. To make sure the rightReplication of cellular components and division, there are control mechanisms referred to as cycle checkpoints after each of the key steps of the cycle that determine if the can reach subsequent In cells without nuclei (prokaryotes), (i.e., bacteria and archaea), the cycle is split into the B, C, and D periods. The B period extends from the top of cellular division to the start of DNA replication. DNA replication occurs during the C period. The D period refers to the stage between the top of DNA replication and therefore the splitting of the bacterial into two daughter cells. The cell-division cycle may be a vital process by which a single-celled embryo develops into a mature organism, also because the process by which hair, skin, blood cells, and a few internal organs are renewed. After cellular division, each of the daughter cells begin the interphase of a replacement cycle. Although the varied stages of interphase aren't usually morphologically distinguishable, each phase of the cycle features a distinct set of specialised biochemical processes that prepare the for initiation of the cellular division. The eukaryotic cycle consists of 4 distinct phases: G1 phase, S phase (synthesis), G2 phase (collectively referred to as interphase) and phase (mitosis and cytokinesis). phase is itself composed of two tightly coupled processes: mitosis, during which the cell's nucleus divides, and cytokinesis, during which the cell's cytoplasm divides forming two daughter cells. Activation of every phase depends on the right progression and completion of the previous one. Cells that have temporarily or reversibly stopped dividing are said Interphase proceeds in three stages, G1, S, and G2, followed by the cycle of and cytokinesis. The cell's nuclear DNA contents are duplicated during S Mitosis is instantly followed by cytokinesis, which divides the nuclei, cytoplasm, organelles and wall into two cells containing roughly equal shares of those cellular components. Mitosis and cytokinesis together define the division of the into two daughter cells, genetically just like one another and to their parent cell. This accounts for about 10% of the cycle. Because cytokinesis usually occurs in conjunction with mitosis, mitosis is usually used interchangeably with M phase. However, there are many cells where and cytokinesis occur separately, forming single cells with multiple nuclei during a process called endoreplication. This happens most notably among the fungi and slime molds, but is found in various groups. Even in animals, cytokinesis and may occur independently, as an example during certain stages of pomace fly embryonic development. Errors in may result in necrobiosis through apoptosis or cause mutations which will cause cancer. Regulation of the cycle involves processes crucial to the survival of a cell, including the detection and repair of genetic damage also because the prevention of uncontrolled cellular division. The molecular events that control the cycle are ordered and directional; that’s, each process occurs during a sequential fashion and it's impossible to reverse the cycle. Two key classes of regulatory molecules, cyclins and cyclin-dependent kinases (CDKs), determine a cell's progress through the cycle. Leland H. Hartwell, R. Timothy Hunt, and Paul M. Nurse won the 2001 Nobel Prize in Physiology or Medicine for his or her discovery of those central molecules. Many of the genes encoding cyclins and CDKs are conserved among all eukaryotes, but generally more complex organisms have more elaborate cycle control systems that incorporate more individual components. Many of the relevant genes were first identified by studying yeast, especially baker's yeast. Genetic nomenclature in yeast dubs many of those genes cdc (for cell division cycle) followed by an identifying number, e.g. cdc25 or cdc20. Cyclins form the regulatory subunits and CDKs the catalytic subunits of an activated heterodimer; cyclins haven't any catalytic activity and CDKs are inactive within the absence of a partner cyclin. When activated by a bound cyclin, CDKs perform a standard biochemical reaction called phosphorylation that activates or inactivates target proteins to orchestrate coordinated entry into subsequent phase of the cycle. Different cyclin-CDK combinations determine the downstream proteins targeted. CDKs are constitutively expressed in cells whereas cyclins are synthesised at specific stages of the cycle, in response to varied molecular signals. During the last years, several molecular-biology tools have been extensively used in scientific research for identifying new function of proteins and metabolites. Still, the identification of metabolites, specially which control the cycle is not trivial and is characterized by piecemeal progress, especially in plants. In this seminar, we will discuss the methodologies that we are using to identify and characterize metabolites that bind to the APC in the model plant Arabidopsis, and to potentially define their roles in plant development." @default.
• W3107210004 created "2020-12-07" @default.
• W3107210004 creator A5076778486 @default.
• W3107210004 date "2020-01-01" @default.
• W3107210004 modified "2023-09-23" @default.
• W3107210004 title "APC as an entry point to study small molecule regulation of the cell cycle" @default.
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