通过与PPAT相互作用,NUDT5调节胺代谢和胺敏感性
bioRxiv : the preprint server for biology
|April 16, 2025
概括
努迪克斯酸酶5 (NUDT5) 调节氨酸合成平衡. 它与PPAT的相互作用控制了新的 purin生物合成 (DNPB) 并影响了 thiopurine 药物疗效,提供了新的治疗点.
科学领域:
- 细胞代谢的细胞代谢.
- 生物化学 生物化学
- 分子生物学分子生物学
背景情况:
- 细胞通过新的 purin 生物合成 (DNPB) 和 purin 救援途径来平衡 purin 核酸生产.
- 过度的DNPB与高尿血和神经功能障碍等疾病有关.
- 控制这些通路之间的平衡的机制尚未完全理解.
研究的目的:
- 在纯素救援过程中识别de novo纯素生物合成 (DNPB) 的调节者.
- 了解努迪克斯酶5 (NUDT5) 在核酸代谢中的作用.
- 为了研究NUDT5对氨酸药物敏感性的影响.
主要方法:
- 全基因组的CRISPR功能丧失屏幕.
- 稳定的同位素追踪. 稳定的同位素追踪.
- 生物化学试验用于研究酶相互作用和纯酶体动力学.
主要成果:
- 努迪克斯酸酶5 (NUDT5) 在氨酸救援过程中被确定为DNPB的抑制剂.
- 除NUDT5会导致持续的DNPB和对氨酸药物的耐药性.
- 通过与PPAT相互作用,NUDT5调节DNPB,并促进纯酶体分解,独立于其已知的催化活性.
结论:
- NUDT5 是一个关键的调节器,平衡 de novo purin 生物合成 (DNPB) 和 purin 挽救.
- NUDT5和PPAT之间的相互作用对于控制DNPB和纯酶体组合至关重要.
- 向NUDT5-PPAT相互作用可能会调节核酸代谢并改善硫氨酸治疗结果.
更多相关视频
相关概念视频
Allosteric Proteins-ATCase
5.6K
Binding sites linkages can regulate a protein's function. For example, enzyme activity is often regulated through a feedback mechanism where the end product of the biochemical process serves as an inhibitor.
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
Aspartate transcarbamoylase (ATCase) is a cytosolic enzyme that catalyzes the condensation of L-aspartate and carbamoyl phosphate to N-carbamoyl-L-aspartate. This reaction is the first step in pyrimidine biosynthesis. UTP and CTP, the end products of the pyrimidine synthesis...
5.6K
Abnormal Proliferation
4.4K
Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...
4.4K
Covalently Linked Protein Regulators
6.7K
Proteins can undergo many types of post-translational modifications, often in response to changes in their environment. These modifications play an important role in the function and stability of these proteins. Covalently linked molecules include functional groups, such as methyl, acetyl, and phosphate groups, and also small proteins, such as ubiquitin. There are around 200 different types of covalent regulators that have been identified.
These groups modify specific amino acids in a protein....
These groups modify specific amino acids in a protein....
6.7K
Nonsense-mediated mRNA Decay
10.4K
The Upf proteins that carry out nonsense-mediated decay (NMD) are found in all eukaryotic organisms, including humans. Each protein has an individual role, but they need to work in collaboration. Upf1 is an ATP-dependent RNA helicase that unwinds the RNA helix. Because Upf1 can unwind any RNA, Upf2 and Upf3 are required to help Upf1 discriminate between nonsense and normal mRNAs.
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
Usually, Upf3 binds to an Exon Junction Complex (EJC) at mRNA splice sites. If a ribosome fully translates the mRNA,...
10.4K
Regulation of Nuclear Protein Sorting
2.3K
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
2.3K
Nucleotide Excision Repair
3.4K
DNA Distortion and Damage
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
Cells are regularly exposed to mutagens—factors in the environment that can damage DNA and generate mutations. UV radiation is one of the most common mutagens and is estimated to introduce a significant number of changes in DNA. These include bends or kinks in the structure, which can block DNA replication or transcription. If these errors are not fixed, the damage can cause mutations, which in turn can result in cancer or disease depending on which sequences are...
3.4K


