| 来源类型 | Monograph (IIASA Interim Report)
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| 规范类型 | 报告
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| A Mathematical Model for Apoptosome Assembly: The Optimal Cytochrome c/Apaf-1 Ratio. |
| Nakabayashi J; Sasaki A
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| 发表日期 | 2006
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| 出版者 | IIASA, Laxenburg, Austria: IR-06-077
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| 出版年 | 2006
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| 语种 | 英语
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| 摘要 | Apoptosis, a highly conserved form of cell suicide, is regulated by apoptotic signals and their transduction with caspases, a family of cystein proteases. Caspases are constantly expressed in the normal cells as inactive pro-enzymes. The activity of caspase is regulated by the proteolysis. Sequential proteolytic reactions of caspases are needed to execute apoptosis. Mitochondrial pathway is one of these apoptotic signal pathways, in which caspases are oligomerized into characteristic heptamer structure, called apoptosome, with caspase-9 that activate the effector caspases for apoptosis. To investigate the dynamics of signal transduction pathway regulated by oligomerization, we construct a mathematical model for Apaf-1 heptamer assembly process. The model first reveals that intermediate products can remain unconverted even after all assemble reactions are completed. The second result of the model is that the conversion efficiency of Apaf-1 heptamer assembly is maximized when the initial concentration of cytochrome c is equal to that of Apaf-1. When the concentration of cytochrome c is sufficiently larger or smaller than that of Apaf-1, the final Apaf-1 heptamer production is decreased, because intermediate Apaf-1 oligomers (tetramers and bigger oligomers), which themselves are unable to form active heptamer, accumulate too fast in the cells, choking a smooth production of Apaf-1 heptamer. Slow activation of Apaf-1 monomers and small oligomers increase the conversion efficiency. We also study the optimal number of subunits comprising an active oligomer that maximize the conversion efficiency in assembly process, and found that the tetramer is the optimum. |
| 主题 | Evolution and Ecology (EEP)
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| URL | http://pure.iiasa.ac.at/id/eprint/8022/
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| 来源智库 | International Institute for Applied Systems Analysis (Austria)
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| 资源类型 | 智库出版物
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| 条目标识符 | http://119.78.100.153/handle/2XGU8XDN/125481
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推荐引用方式
GB/T 7714 |
Nakabayashi J,Sasaki A. A Mathematical Model for Apoptosome Assembly: The Optimal Cytochrome c/Apaf-1 Ratio.. 2006.
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文件名：
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IR-06-077.pdf
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格式：
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Adobe PDF
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