PRKAR2B(蛋白激酶cAMP依赖性调节亚基IIβ)是cAMP依赖性蛋白激酶(PKA)的调节亚基之一,属于PRKAR基因家族。PKA是一种重要的丝氨酸/苏氨酸激酶,在细胞信号转导中起核心作用,通过cAMP的激活调控多种生理过程,如代谢、基因表达、细胞增殖和分化。PRKAR2B主要在脑、脂肪组织和骨骼肌中高表达,其功能是与催化亚基结合形成PKA全酶,在无cAMP时抑制催化亚基活性;当cAMP水平升高时,PRKAR2B与cAMP结合并释放催化亚基,使其磷酸化下游靶蛋白。PRKAR2B的突变可能导致PKA信号通路异常,与多种疾病相关,如心脏疾病、代谢紊乱和某些癌症。例如,PRKAR2B的某些突变可能导致家族性心脏传导障碍或心律失常。此外,PRKAR2B在脂肪组织中的表达异常与肥胖和胰岛素抵抗有关,可能通过影响脂肪分解和能量代谢。PRKAR2B过表达可能导致PKA信号通路过度激活,进而影响细胞增殖和分化,与某些肿瘤的发生发展相关;而PRKAR2B表达降低可能导致PKA活性不足,影响正常的细胞信号转导和代谢调控。PRKAR2B属于PRKAR基因家族,该家族包括PRKAR1A、PRKAR1B、PRKAR2A和PRKAR2B,这些基因编码PKA的调节亚基,共同特点是能够结合cAMP并调控PKA的活性,但它们在组织分布和功能上存在差异。PRKAR2B与PRKAR2A高度同源,但表达谱和某些功能特性不同。PRKAR2B在神经系统中的作用尤为突出,可能参与学习、记忆和神经保护。研究表明,PRKAR2B的表达水平变化可能影响其他基因的表达或功能,尤其是那些受PKA调控的基因,如CREB(cAMP反应元件结合蛋白)靶基因。PRKAR2B的异常表达还可能影响其他信号通路,如MAPK和PI3K/AKT通路,进而影响细胞的生长和存活。总之,PRKAR2B是一个关键的信号调控分子,其正常功能对维持细胞稳态和机体健康至关重要。
cAMP is a signaling molecule important for a variety of cellular functions. cAMP exerts its effects by activating the cAMP-dependent protein kinase, which transduces the signal through phosphorylation of different target proteins. The inactive kinase holoenzyme is a tetramer composed of two regulatory and two catalytic subunits. cAMP causes the dissociation of the inactive holoenzyme into a dimer of regulatory subunits bound to four cAMP and two free monomeric catalytic subunits. Four different regulatory subunits and three catalytic subunits have been identified in humans. The protein encoded by this gene is one of the regulatory subunits. This subunit can be phosphorylated by the activated catalytic subunit. This subunit has been shown to interact with and suppress the transcriptional activity of the cAMP responsive element binding protein 1 (CREB1) in activated T cells. Knockout studies in mice suggest that this subunit may play an important role in regulating energy balance and adiposity. The studies also suggest that this subunit may mediate the gene induction and cataleptic behavior induced by haloperidol. [provided by RefSeq, Jul 2008]
cAMP的是一个信号分子对各种细胞功能很重要的。 cAMP的施加通过激活cAMP依赖性蛋白激酶,其通过不同的靶蛋白的磷酸化将信号传递其作用。非活动激酶全酶是两个调控和两个催化亚基组成的四聚体。的cAMP导致非活动全酶的解离成结合到四个cAMP和两个自由单体催化亚基调节亚基的二聚体。四种不同的调节亚基和三个催化亚基在人类已确定。由该基因编码的蛋白质是调节亚基中的一个。此亚基可由活化的催化亚基被磷酸化。这种亚单位已被证明与交互,并且在活化的T细胞抑制cAMP反应元件结合蛋白1(CREB1)的转录活性。在小鼠中敲除研究表明,这种亚单元可以在调节能量平衡和肥胖症中起重要作用。该研究还表明,这种亚基可以介导的基因诱导和由氟哌啶醇诱导的僵住症的行为。 [由RefSeq的,2008年7月提供]
PRKAR2B基因(以及对应的蛋白质)的细胞分布位置:
PRKAR2B基因的本体(GO)信息:
| 名称 |
|---|
| 4210 Apoptosis [PATH:hsa04210] |
| 4910 Insulin signaling pathway [PATH:hsa04910] |
| 名称 |
|---|
| Anchoring of the basal body to the plasma membrane |
| Aquaporin-mediated transport |
| Assembly of the primary cilium |
| Ca-dependent events |
| Calmodulin induced events |
| CaM pathway |
| Cell Cycle |
| Cell Cycle, Mitotic |
| Centrosome maturation |
| DAG and IP3 signaling |
| DAP12 interactions |
| DAP12 signaling |
| DARPP-32 events |
| Downstream signal transduction |
| Downstream signaling of activated FGFR1 |
| Downstream signaling of activated FGFR2 |
| Downstream signaling of activated FGFR3 |
| Downstream signaling of activated FGFR4 |
| EGFR interacts with phospholipase C-gamma |
| Factors involved in megakaryocyte development and platelet production |
| G-protein mediated events |
| G2/M Transition |
| Glucagon signaling in metabolic regulation |
| Glucagon-like Peptide-1 (GLP1) regulates insulin secretion |
| Hedgehog 'off' state |
| Hemostasis |
| Immune System |
| Innate Immune System |
| Integration of energy metabolism |
| Loss of Nlp from mitotic centrosomes |
| Loss of proteins required for interphase microtubule organization from the centrosome |
| Mitotic G2-G2/M phases |
| NGF signalling via TRKA from the plasma membrane |
| Opioid Signalling |
| Organelle biogenesis and maintenance |
| Phospholipase C-mediated cascade; FGFR2 |
| Phospholipase C-mediated cascade; FGFR3 |
| Phospholipase C-mediated cascade; FGFR4 |
| Phospholipase C-mediated cascade: FGFR1 |
| PKA activation |
| PKA activation in glucagon signalling |
| PKA-mediated phosphorylation of CREB |
| PLC beta mediated events |
| PLC-gamma1 signalling |
| PLCG1 events in ERBB2 signaling |
| Recruitment of mitotic centrosome proteins and complexes |
| Regulation of insulin secretion |
| Regulation of PLK1 Activity at G2/M Transition |
| Signaling by EGFR |
| Signaling by ERBB2 |
| Signaling by FGFR |
| Signaling by FGFR1 |
| Signaling by FGFR2 |
| Signaling by FGFR3 |
| Signaling by FGFR4 |
| Signaling by GPCR |
| Signaling by Hedgehog |
| Signaling by PDGF |
| Signalling by NGF |
| Transmembrane transport of small molecules |
| Vasopressin regulates renal water homeostasis via Aquaporins |
| 疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
| Obesity | 0.12 | 1 | 0 | CTD_human |
| Lupus Erythematosus, Systemic | 0.00272435 | 1 | 0 | LHGDN |
| Polycystic Ovary Syndrome | 0.00272435 | 1 | 0 | LHGDN |
| Osteoarthritis, Knee | 0.002367032 | 1 | 0 | GAD |
| Cholangiocarcinoma | 0.000271442 | 1 | 0 | BeFree |
| Degenerative polyarthritis | 0.000271442 | 1 | 0 | BeFree |
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