氨酸酸化CARM1促进其酶活性,并改变其向特异性
Hidehiro Itonaga1, Adnan K Mookhtiar1, Sarah M Greenblatt1,2
1Sylvester Comprehensive Cancer Center, University of Miami, Miller School of Medicine, Miami, FL, 33136, USA.
Nature communications
|April 22, 2024
概括
雅努斯酶2 (JAK2) V617F突变酸化CARM1,增强其活性并改变基质特异性. 这种酸化对恶性髓状细胞增殖至关重要,并表明JAK2/CARM1双重向急性髓状白血病.
科学领域:
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
- 癌症生物学 癌症生物学
背景情况:
- 基因组酸化是氨酸激酶信号传递中的一个关键的表观遗传机制.
- 蛋白质氨酸甲基转移酶 (PRMT) 的酶活性由酸化调节.
- 同活性剂相关的阿尔金因甲基转移酶1 (CARM1) 是血液恶性瘤的点.
研究的目的:
- 调查Janus激酶2 (JAK2) V617F突变对CARM1酸化和活性的影响.
- 确定CARM1酸化对其基质特异性和细胞功能的影响.
- 评估向JAK2和CARM1在急性髓性白血病 (AML) 的治疗潜力.
主要方法:
- 局部定向突变生成以产生非酸化的CARM1突变体.
- 在体外甲基转移酶试验中,评估CARM1活性和基质特异性.
- 基于细胞的测试来评估细胞周期进展,细胞亡和基因表达.
- 用JAK2和CARM1抑制剂对AML细胞系进行抑制研究.
主要成果:
- JAK2-V617F在Y149和Y334酸化CARM1,增加其甲基转移酶活性并改变基质特异性.
- -CARM1特别甲基化了RUNX1转录因子,与非酸化的CARM1.1不同.
- 具有非酸化CARM1的细胞表现出细胞周期进展受损,细胞亡增加,G2/M和抗细胞亡基因的表达减少.
- 针对JAK2和CARM1的双重向比单一治疗更有效,在AML细胞中表达光-CARM1.
结论:
- 过度激活的JAK2对CARM1的酸化调节了它的甲基转移酶活性和基质选择.
- 酸化CARM1对于恶性髓状细胞的增殖至关重要.
- 双重JAK2和CARM1抑制是AML的一种有前途的治疗策略.
相关概念视频
Allosteric Proteins-ATCase
5.7K
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...
5.7K
Receptor Tyrosine Kinases
12.8K
Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
12.8K
Transducer Mechanism: Enzyme-Linked Receptors
2.4K
Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
Major types that are helpful drug targets include:
Major types that are helpful drug targets include:
2.4K
Phosphorylation
50.3K
The addition or removal of phosphate groups from proteins is the most common chemical modification that regulates cellular processes. These modifications can affect the structure, activity, stability, and localization of proteins within cells as well as their interactions with other proteins.
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
During phosphorylation, protein kinases transfer the terminal phosphate group of ATP to specific amino acid side chains of substrate proteins. Serine, threonine, and tyrosine are the most commonly...
50.3K
Covalently Linked Protein Regulators
6.8K
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....
6.8K
cAMP-dependent Protein Kinase Pathways
6.3K
Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
6.3K


