相关实验视频
Updated: Jul 12, 2025

07:47
Directly Measuring Forces Within Reconstituted Active Microtubule Bundles
Published on: May 10, 2022
1.7K
修改KIF18A的链器会改变微管子子群的偏好
Katelyn A Queen1, Alisa Cario1, Christopher L Berger1
1Department of Molecular Physiology and Biophysics, University of Vermont, Burlington, VT, 05401.
Molecular biology of the cell
|October 30, 2023
概括
基因素的翻译后修改,如KIF18A,调节它们的细胞作用. 在S357的酸化改变了KIF18A的局部化,影响了线粒状的功能和进展.
科学领域:
- 细胞生物学 细胞生物学
- 分子运动功能分子运动功能
- 线粒分裂 (mitosis) 是一种发生在细胞的过程.
背景情况:
- 氨酸对细胞过程至关重要,包括通过线粒体调节的细胞分裂.
- 对于激素活性,特别是它们的酶区域的翻译后修饰 (PTMs) 的精确控制机制,仍然在很大程度上未被探索.
- 酶区域内的PTMs对于核酸和微管结合至关重要,是素功能的潜在关键调节者.
研究的目的:
- 为了研究基因素酶区域内翻译后修饰的意义.
- 为了确定特定的PTM如何影响细胞局部化和基因素KIF18A在线粒分裂期间的功能.
主要方法:
- 在KIF18A的链器中利用了模仿突变 (S357D) 来模仿酸化.
- 使用显微镜观察了KIF18A在线粒轴内的定位.
- 分析了突变对线粒状的定位和进展的影响.
主要成果:
- 在KIF18A中S357D突变导致其局部位置从kinetochore微管转移到外围非kinetochore微管.
- 这种改变的局部化与线粒体旋定位的缺陷和受损的线粒体进展有关.
- 观察到的局部化模式模仿了一个缩短的部链接器突变的局部化模式,表明了形状变化.
结论:
- 基因素酶区域的翻译后修饰可以显著影响它们的局部化到特定的微管子群.
- 这些修饰在细胞分裂期间调节KIF18A的功能方面发挥着关键作用.
- 向PTM提供了一种潜在的机制来控制激素活性和细胞过程.
相关概念视频
Destabilization of Microtubules
2.7K
The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
2.7K
Anaphase A and B
4.1K
Microtubules form through the end-to-end polymerization of tubulin heterodimers. Kinetochore microtubules originate from the spindle poles, and their plus-ends connect with the kinetochores on sister-chromatids. Ndc80 protein complexes, present on the kinetochore, form low-affinity links with the plus end of these kinetochore microtubules.
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
Plus-end depolymerization releases tubulin heterodimers from the terminal region of the microtubule. As tubulin subunits are lost, the Ndc80 complexes detach...
4.1K
Microtubule Formation
5.8K
Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation...
5.8K
Attachment of Sister Chromatids
3.3K
As cells progress into mitosis, the nuclear envelope breaks down, and the condensed chromosomes are exposed to the array of bipolar microtubules of the mitotic spindle. The kinetochore, a large, disc-shaped protein complex, is present at the centromere region of the sister chromatids and acts as a binding site for the microtubules. Usually, the plus-end of a single microtubule is embedded within the kinetochore. However, some kinetochores first establish lateral contact with the side-wall...
3.3K
Microtubule Associated Proteins (MAPs)
4.4K
Microtubule function and architecture are regulated by an array of specialized proteins called microtubule-associated proteins or MAPs. These proteins are widespread across different organisms and have conserved protein motifs, like the multi-TOG domain for tubulin binding found in the CLASP family of MAPs. Some MAPs are lineage-specific based on their conserved domains. Their functions depend upon the cytoskeletal architecture and cell type they are located within. In-plant cells, a specific...
4.4K
Microtubule Instability
5.1K
Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
5.1K

