相关实验视频
Updated: May 10, 2026

06:39
Live Cell Imaging of Chromosome Segregation During Mitosis
Published on: March 14, 2018
在线粒分裂期间的中间线丝重组是由维门的p34cdc2酸化介导的
Y H Chou1, J R Bischoff, D Beach
1Department of Cell, Molecular and Structural Biology, Northwestern University, Chicago, Illinois 60611.
Cell
|September 21, 1990
概括
在线粒分裂过程中,像维门丁这样的中间丝 (IF) 蛋白被p34cdc2激酶复合体过酸化,导致IF网络分解. 这种酸化对于M阶段细胞重组至关重要.
科学领域:
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
- 生物化学 生物化学
背景情况:
- 介质丝 (IFs) 在线粒分裂过程中脱聚合.
- 维门和德斯在线分裂过程中在特定的部位被过酸化.
- 负责维门超酸化的激酶尚未完全被描述.
研究的目的:
- 描述一个参与线性IF重组的维门丁激酶.
- 为了识别维门激酶复合物的组成部分.
- 为了确定维门丁是否是p34cdc2.2的基质.
主要方法:
- 从线性BHK-21细胞溶解物中净化维丁激酶活性.
- 通过基因素H1激酶活性和p13suc1-Sepharose结合的对净化.
- 在体外酸化试验中,使用纯化激酶复合物和维丁.
主要成果:
- 维门激酶活性与素H1激酶合净,并与p13suc1-Sepharose结合.
- 净化的激酶复合体含有p34cdc2,65kDa和110kDa的多.
- 酶复合物在线体内在线粒位点化了维门丁,并诱导了IFs的分解.
结论:
- 维门丁是p34cdc2激酶复合物的直接基质.
- 由p34cdc2对维门的酸化有助于在M阶段中介性丝网的重组.
- 这项研究确定了线粒细胞细胞重组的关键机制.
相关概念视频
Formation of Intermediate Filaments
Intermediate filaments are cytoskeletal proteins with higher tensile strength and flexibility than microfilaments and microtubules. Unlike the other two cytoskeletal proteins, intermediate filament formation lacks the enzymatic activity to hydrolyze nucleotides like ATP and GTP to generate energy for polymerization. Therefore, the formation of intermediate filaments is multistep self-assembly. The involvement of any accessory proteins in intermediate filament formation has not yet been reported.
Forces Acting on Chromosomes
During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...
Microtubules and motor proteins exert two types of forces on...
Separation of Sister Chromatids
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...
Mechanism of Filopodia Formation
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Disassembly of Intermediate Filaments
Intermediate filaments (IFs) do not undergo spontaneous disassembly. Enzymes, kinases, and phosphatases add and remove phosphates from specific sites to regulate their disassembly. The IF concentration in the cytoplasm also regulates the disassembly. If the concentration crosses a threshold, it activates the protein kinases in the vicinity, allowing the phosphorylation of IFs.
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Keratin proteins, found at the cell periphery near cell junctions, undergo a cycle of assembly and disassembly. In Type...
Separation of Sister Chromatids
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...

