相关实验视频

Updated: Jul 24, 2025

Author Spotlight: Exploring the Role of FAM83A in Cervical Cancer

Author Spotlight: Exploring the Role of FAM83A in Cervical Cancer

Published on: February 9, 2024

通过ATR的酸化触发了FANCD2染色体负载,并激活了Fanconi贫血路径

Marian Kupculak¹, Fengxiang Bai¹, Qiang Luo¹

¹Department of Biochemistry, University of Oxford, Oxford OX1 3QU, UK.

|July 1, 2023

概括

芬科尼贫血 (FA) 途径使用ATR介导的FANCD2酸化来将FANCD2/FANCI复合物加载到染色体上,使DNA修复成为可能. 这种酸化对于激活FA通路和修复DNA跨链交叉链路至关重要.

科学领域:

分子生物学分子生物学
细胞生物学细胞生物学
遗传学遗传学是一个

背景情况:

芬科尼贫血 (FA) 途径对于修复DNA跨链交叉连接 (ICL) 是必不可少的.
激活FA通路需要将FANCD2/FANCI复合体加载到染色体上.
在染色体上FANCD2/FANCI复合加载的精确机制尚未完全理解.

研究的目的:

为了阐明FANCD2/FANCI复合体在DNA修复过程中被载入染色体的机制.
确定特定酸化事件在FANCD2/FANCI复合体加载和激活调节中的作用.

主要方法:

在FANCD2.2.上识别和描述SQ/TQ酸化位点.
生物化学试验用于研究蛋白质相互作用和酸化.
活细胞成像,包括超分辨率单分子跟踪,以可视化复杂的动态.
功能测试,以评估酸化对复杂负载和激活的影响.

主要成果:

在FANCD2上确定了10个SQ/TQ化位点,这些位点在响应ICL时被ATR化.
这些酸化事件对于FANCD2/FANCI复合体在染色体上有效加载至关重要.
酸化对于随后的单双化和复合物的完全激活至关重要.
恒定酸化模仿了一个不受控制的活性状态,导致染色体不受约束的负载.

结论:

在特定部位的ATR介导的FANCD2酸化是FANCD2/FANCI复合体对染色体的关键调节机制.
这种酸化事件是激活Fanconi贫血路径和DNA修复的先决条件.
这项研究揭示了一种新的机制,控制FANCD2/FANCI复合体的精确时空负载,这对于保持基因组稳定至关重要.

关键词:

这是一个ATRATRATRATR.科普:分子生物学分子生物学在FANCD2/FANCI中使用.芬科尼贫血症是什么意思在 ICL 维修 ICL 维修癌症癌症癌症癌症癌症基因组的不稳定性酸化的方法是:光化.

更多相关视频

Intracellular Phosphoflow Cytometry of Acute Myeloid Leukemia Patient-Derived Xenotransplants

Intracellular Phosphoflow Cytometry of Acute Myeloid Leukemia Patient-Derived Xenotransplants

Published on: June 6, 2025

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay

Identification of Cyclin-dependent Kinase 1 Specific Phosphorylation Sites by an In Vitro Kinase Assay

Published on: May 3, 2018

相关概念视频

Anaphase Promoting Complex

Anaphase Promoting Complex

The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...

DNA Damage can Stall the Cell Cycle

DNA Damage can Stall the Cell Cycle

In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...

Restarting Stalled Replication Forks

Restarting Stalled Replication Forks

DNA replication is initiated at sites containing predefined DNA sequences known as origins of replication. DNA is unwound at these sites by the minichromosome maintenance (MCM) helicase and other factors such as Cdc45 and the associated GINS complex.The unwound single strands are protected by replication protein A (RPA) until DNA polymerase starts synthesizing DNA at the 5’ end of the strand in the same direction as the replication fork. To prevent the replication fork from falling apart,...

MAPK Signaling Cascades

MAPK Signaling Cascades

Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...

The Extrinsic Apoptotic Pathway

The Extrinsic Apoptotic Pathway

The extrinsic apoptotic pathway is initiated when extracellular death-inducing signals, such as specific cytokines, activate the death receptors expressed on the cell surface. The immune cells involved in this pathway are natural killer cells (NK cells) and cytotoxic T-lymphocytes. NK cells are critical in innate immune response, while cytotoxic T-lymphocytes are associated with adaptive immune response. These cells recognize specific receptors expressed on the altered cells and activate...

The Intrinsic Apoptotic Pathway

The Intrinsic Apoptotic Pathway

Internal cellular stress, such as cellular injury or hypoxia, triggers intrinsic apoptosis. The B-cell lymphoma 2 (Bcl-2) family of proteins are the primary regulators of the intrinsic apoptotic pathway. For example, during DNA damage, checkpoint proteins, such as Ataxia Telangiectasia Mutated (ATM protein) and Checkpoints Factor-2 (Chk2) proteins, are activated. These proteins phosphorylate p53 which further activates pro-apoptotic proteins, such as Bax, Bak, PUMA, and Noxa, and inhibits...