中一种MCM复合物的演化,该复合物通过阻断BLM螺旋酶来促进介质交叉
Kathryn P Kohl1, Corbin D Jones, Jeff Sekelsky
1Curriculum in Genetics and Molecular Biology, University of North Carolina, Chapel Hill, NC 27599, USA.
概括
在中,微染色体维护 (MCM) 蛋白质取代了Msh4-Msh5复合体,以确保介质交叉生成. 这种MCM复合体的演变是为了促进交叉,克服Msh4-Msh5.5的损失.
科学领域:
- 遗传学 是一个遗传学.
- 分子生物学分子生物学
- 进化生物学 进化生物学
背景情况:
- 在真核生物中,介质交叉形成通常涉及抑制抗交叉基酶的Msh4-Msh5异构体.
- 在Drosophila和Glossina等中,Msh4和Msh5蛋白质不存在.
研究的目的:
- 为了确定功能性取代Drosophila中Msh4-Msh5异构体的蛋白质,用于介质交叉生成.
- 研究这些替代蛋白质的进化起源和功能.
主要方法:
- 对于关键基因 (rec, mei-217, mei-218) 的多索菲拉突变的遗传分析.
- 生物化学相互作用研究以确定蛋白质复合体.
- 比较基因组学来追踪MCM蛋白质的进化历史.
主要成果:
- 确定了一组微染色体维护 (MCM) 蛋白质的复合体,包括REC (MCM8 ortholog) 和新型蛋白质MEI-217/MEI-218.
- 在中在阳性选择下演变的REC与MEI-217/MEI-218相互作用,这是甲状动物特异性的MCM蛋白.
- 在rec,mei-217或mei-218中发生的突变减少了介质交叉,但通过去除布鲁姆综合征螺旋酶 (BLM) 来挽救了这一点.
结论:
- 微染色体维护 (MCM) 蛋白质被重新使用,形成一种新的复合物,替代了中Msh4-Msh5的介质性亲交叉功能.
- 这种MCM复合体在没有Msh4-Msh5.5的情况下,在调节介质交叉中发挥着至关重要的作用.
相关概念视频
M-Cdk Drives Transition Into Mitosis
Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
M-Cdk Drives Transition Into Mitosis
Checkpoints throughout the cell cycle serve as safeguards and gatekeepers, allowing the cell cycle to progress in favorable conditions and slow or halt it in problematic ones. This regulation is known as the cell cycle control system.
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Cyclin-dependent kinases, or Cdks, work in concert with cyclins to control cell cycle transitions. M-Cdk, a complex of Cdk1 bound to M cyclin, is a well-known example of this coordinated control that drives the transition from the G2 to the M phase.
M cyclin...
Crossing Over
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, duplicated...
Crossing Over
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 called synapsis.
In order to...
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 called synapsis.
In order to...
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...
The Spindle Assembly Checkpoint
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...


