改变β1-上腺素受体N-终端单核酸变体的O-糖化调节受体处理和功能活动
Hanna E Tuhkanen1, Ilona J Haasiomäki1, Jarkko J Lackman1,2
1Medical Research Center Oulu and Research Unit of Biomedicine and Internal Medicine, University of Oulu, Finland.
The FEBS journal
|August 29, 2024
概括
在G蛋白合受体 (GPCRs) 中常见的遗传变异可以改变它们的功能. 这项研究表明,β-1上腺素受体 (β1AR) 中的N端单核酸多态 (SNPs) 影响其处理和信号传递,可能导致功能获取.
科学领域:
- 分子生物学分子生物学
- 药理学 药理学是指药理学的学科.
- 遗传学 遗传学是一种遗传学.
背景情况:
- 在G蛋白合受体 (GPCRs) 中的N端单核酸多态 (SNP) 是常见的,并且可以影响翻译后的修改,但它们的功能后果在很大程度上是未知的.
- 人类β-1上腺素受体 (β1AR) 在其N终端细胞外域中经历O-糖化,这一过程由聚酸N-乙甲胺氨基转移酶2 (GalNAc-T2) 调节,并影响受体蛋白质分解裂变.
- 以前的研究确定了O-糖化在β1AR处理中的作用及其与受体分裂的相互作用.
研究的目的:
- 研究β1AR中常见和罕见的N-终端SNP的功能影响.
- 确定特定的SNP (S49G,A29T,R31Q) 如何影响β1AR O-糖化和随后的蛋白质分解加工.
- 阐明这些改变的修改和处理对β1AR细胞表面表达和信号的影响.
主要方法:
- 在体外O-糖化测试以评估受体变异的修饰.
- 对原生受体N终端O-糖的分析,以确定修饰部位.
- 在细胞系和O-糖化缺陷的新生儿大鼠室内心肌细胞中表达β1AR变异.
- 生物发光能量转移 (BRET) 试验测量β-arrestin2招募和异二醇介导信号.
主要成果:
- 在位置49 (S49G),29 (A29T) 和31 (R31Q) 的SNP有差异变化的N-终端O-糖化位点.
- S49G SNP消除了一种葡萄糖体,而A29T引入了一种葡萄糖体,R31Q取消了一种主要的葡萄糖体,影响相邻的蛋白质分解裂变部位 (P52↓L53和R31↓L32).
- A29T和R31Q变体的蛋白质分解减少,导致细胞表面的全长受体水平增加和信号增强,特别是与C端R389G多态相结合.
结论:
- N-终端β1AR SNPs可以显著改变受体的翻译后修饰,处理和功能,独立于正规的连接体结合域.
- 常见的S49G SNP,导致人类的功能获取表型,突出显示了基因变异对GPCRs的进化影响.
- 这项研究强调了研究GPCRSNP在配体结合域之外的重要性,以了解受体调节和识别潜在的药物标.
相关概念视频
Adrenergic Receptors: β Subtype
1.6K
β-adrenoceptors have varied sensitivities towards adrenaline, noradrenaline, and isoprenaline. The order of agonist potency is as follows:
Isoprenaline > Adrenaline > Noradrenaline
Neurotransmitter binding to these receptors causes activation of adenylyl cyclase resulting in increased concentrations of cAMP and modulation of calcium ion channels within the cell. They are further classified into β1, β2, and β3 subtypes.
β1-adrenoceptors: β1-adrenoceptors...
Isoprenaline > Adrenaline > Noradrenaline
Neurotransmitter binding to these receptors causes activation of adenylyl cyclase resulting in increased concentrations of cAMP and modulation of calcium ion channels within the cell. They are further classified into β1, β2, and β3 subtypes.
β1-adrenoceptors: β1-adrenoceptors...
1.6K
Adrenergic Receptors: ɑ Subtype
1.5K
Adrenoceptors are classified into α and ꞵ classes based on their potencies to catecholamine agonists. α-adrenoceptors show the following order of catecholamine potency:
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
α1-Adrenoceptors: These receptors are located postsynaptically on the effector organs and cause constriction of smooth muscle mediated by activation of phospholipase...
Adrenaline ≥ Noradrenaline >> Isoprenaline
α-adrenoceptors are further divided into α1 and α2-adrenoceptors.
α1-Adrenoceptors: These receptors are located postsynaptically on the effector organs and cause constriction of smooth muscle mediated by activation of phospholipase...
1.5K
Adrenergic Receptors (Adrenoceptors): Classification
2.4K
Adrenergic receptors, or adrenoceptors, respond to the autonomic neurotransmitter noradrenaline and other endogenous catecholamine agonists. They are classified into two main families, α and β, based on their pharmacological response and are further subdivided depending on their location, elicited response, and affinity to specific agonists or antagonists.
α-Adrenoceptors
α-Adrenoceptors are classified into two main subtypes: α1 and α2. The α1 adrenoceptors,...
α-Adrenoceptors
α-Adrenoceptors are classified into two main subtypes: α1 and α2. The α1 adrenoceptors,...
2.4K
GPCRs Regulate Adenylyl Cylase Activity
5.4K
Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of...
5.4K
Adrenergic Agonists: Chemistry and Structure-Activity Relationship
2.6K
Adrenergic agonists' structure-activity relationship (SAR) determines their selectivity and efficacy. These agonists comprise a phenylethylamine moiety with an aromatic ring and an ethylamine side chain.
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of...
Aromatic ring substitutions: Substituting the aromatic ring with –OH groups at positions 3 and 4 yields catecholamines (e.g., epinephrine), which have a high affinity for adrenoceptors. Hydrogen bonding between –OH groups and receptors enhances adrenergic activity.
Separation of...
2.6K
GPCR Desensitization
5.9K
G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
5.9K


