交叉形成和协同膜复合体的协调组装依赖于Zip1和Zip3之间的直接相互作用
Sabrina Sharmin1, Karen Voelkel-Meiman1, Alex J Poppel2
1Department of Molecular Biology and Biochemistry Wesleyan University, Middletown, CT, United States of America.
bioRxiv : the preprint server for biology
|December 3, 2025
概括
这项研究表明,Zip1与Zip3直接相互作用,使其稳定,以便在半分裂过程中进行适当的交叉重组. 这种相互作用对染色体分离至关重要,并确保Zip3在ZMM复合体内正确运行.
科学领域:
- 细胞生物学 细胞生物学
- 遗传学 遗传学 是一个
- 分子生物学分子生物学
背景情况:
- 介质重组依赖于ZMM蛋白质进行交叉形成和染色体分离.
- 已知突触膜复合体 (SC) 组成部分Zip1影响Zip3的丰度和活性.
- ZMM因子协作的精确机制,特别是Zip1-Zip3相互作用,尚未完全理解.
研究的目的:
- 阐明Zip1和Zip3之间的直接相互作用及其功能意义.
- 确定Zip1和Zip3的特定区域,这些区域参与了它们的相互作用.
- 了解Zip1结合如何影响Zip3的稳定性和修改.
主要方法:
- 在介质细胞中进行共免疫沉降测定.
- 细菌共同表达和拉下实验以确认直接相互作用.
- 局部定向的突变发生和域分析,以绘制相互作用区域的地图.
- 蛋白质酶抑制和翻译后修饰的分析.
主要成果:
- Zip3直接与Zip1的N端相互作用,独立于其他ZMM和再组合启动.
- 在Zip3中确定了一个未注释的翻译起点;它的N端结构区域介导Zip1结合.
- 在Zip3的RING域下游的一个区域对于Zip1依赖的活动至关重要,包括Zip2近距离标记和SC组件合.
- Zip1的相互作用保护Zip3免受降解和不必要的修改,特别是当其他ZMM缺席时.
结论:
- 直接的Zip1-Zip3相互作用,通过Zip1的N端和Zip3的N端区域进行介导,对半球变异至关重要.
- 这种相互作用将Zip3定位在ZMM复合体内,促进交叉形成和SC组装.
- Zip1绑定确保了Zip3的稳定性和适当的修改状态,直到所有ZMM被组装在一起.
相关概念视频
01:34Crossing Over
168.6K
Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process...
168.6K
01:30Crossing Over
6.1K
Crossing over is the exchange of genetic information between homologous chromosomes during prophase I of meiosis I. Genetic recombination gives rise to allelic diversity in the newly formed daughter cells. In humans, crossing over produces genetically distinct haploid egg and sperm cells that undergo fertilization to produce unique offspring. Before cell division starts, the germ cell’s chromosome(s) undergo duplication in the S phase of the cell cycle. As the cells enter prophase I,...
6.1K
02:20Cohesins
5.4K
Cohesin protein complexes are a molecular glue that holds two sister chromatids together. They play an important role both in mitosis and meiosis. In mitosis, all cohesin complexes present on the chromosomes are removed before the start of the anaphase stage.
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of...
Cohesin complexes in Meiotic Division
Meiosis involves two distinct rounds of chromosomal segregation and cell divisions— Meiosis I followed by Meiosis II – producing four daughter cells. Meiosis I includes the separation of...
5.4K
02:19The Spindle Assembly Checkpoint
3.7K
The spindle assembly checkpoint is a molecular surveillance mechanism ensuring the fidelity of chromosome segregation during anaphase. The checkpoint monitors the completion of all the prerequisite steps before chromosome segregation to determine whether the segregation process should proceed or be delayed.
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
Many proteins function together to control the spindle assembly checkpoint. Mutations affecting these proteins may allow cells to proceed into anaphase prematurely, resulting in the...
3.7K
02:50Spindle Assembly
4.2K
Spindle assembly occurs through three, often coexisting, pathways – the centrosome-mediated pathway, the chromatin-mediated pathway, and the microtubule-mediated pathway – collectively contributing to form a robust spindle apparatus.
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
In most cells, centrosomes are the primary microtubule nucleation centers. In the centrosome-mediated pathway, the G2-prophase transition triggers centrosome maturation and increased microtubule nucleation. Progressive nucleation results in a...
4.2K
02:17Separation of Sister Chromatids
4.3K
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...
4.3K