RASGRP2(RAS Guanyl Releasing Protein 2)是一种鸟苷酸交换因子(GEF),属于RASGRP基因家族。该家族共有四个成员(RASGRP1-4),它们通过激活RAS和RAP等小G蛋白参与细胞信号传导,调控细胞增殖、分化和存活等过程。RASGRP2主要表达于血小板和巨核细胞中,其核心功能是激活RAP1蛋白,从而促进血小板活化和血栓形成。该基因的突变可能导致血小板功能异常,例如Glanzmann血小板无力症(一种罕见的出血性疾病),表现为血小板无法正常聚集。RASGRP2过表达会增强血小板反应性,增加血栓风险;而表达降低则可能导致出血倾向。此外,RASGRP2还参与免疫调节,影响T细胞和B细胞的激活。研究发现该基因与心血管疾病、炎症性疾病和某些癌症相关。RASGRP基因家族的共性在于都含有REM(RAS交换因子)和CDC25结构域,能够催化GDP/GTP交换从而激活RAS超家族蛋白。RASGRP2的独特之处在于其对RAP1而非RAS具有更强选择性。该基因的调控异常可能影响多个信号通路(如MAPK/ERK),进而干扰细胞生理功能。
The protein encoded by this gene is a brain-enriched nucleotide exchanged factor that contains an N-terminal GEF domain, 2 tandem repeats of EF-hand calcium-binding motifs, and a C-terminal diacylglycerol/phorbol ester-binding domain. This protein can activate small GTPases, including RAS and RAP1/RAS3. The nucleotide exchange activity of this protein can be stimulated by calcium and diacylglycerol. Three alternatively spliced transcript variants encoding the same protein have been found for this gene. [provided by RefSeq, Jul 2008]
由该基因编码的蛋白质是含有N-末端GEF域,EF-手钙结合基序2串联重复,以及一个C端的二酰基甘油/佛波醇酯结合脑富含核苷酸交换因子域。这种蛋白质可以激活小GTP酶,包括RAS和RAP1 / RAS3。这种蛋白质的核苷酸交换活性可以通过钙和二酰基甘油刺激。已发现此基因三个编码相同蛋白质可变剪接转录物变体。 [由RefSeq的,2008年7月提供]
RASGRP2基因(以及对应的蛋白质)的细胞分布位置:
RASGRP2基因的本体(GO)信息:
| 名称 |
|---|
| 4014 Ras signaling pathway [PATH:hsa04014] |
| 4015 Rap1 signaling pathway [PATH:hsa04015] |
| 4010 MAPK signaling pathway [PATH:hsa04010] |
| 4611 Platelet activation [PATH:hsa04611] |
| 4062 Chemokine signaling pathway [PATH:hsa04062] |
| 5200 Pathways in cancer [PATH:hsa05200] |
| 名称 |
|---|
| Adaptive Immune System |
| Effects of PIP2 hydrolysis |
| Fc epsilon receptor (FCERI) signaling |
| FCERI mediated NF-kB activation |
| G alpha (q) signalling events |
| Gastrin-CREB signalling pathway via PKC and MAPK |
| GPCR downstream signaling |
| Hemostasis |
| Immune System |
| Innate Immune System |
| Integrin alphaIIb beta3 signaling |
| Platelet activation, signaling and aggregation |
| Platelet Aggregation (Plug Formation) |
| Rap1 signalling |
| Signaling by GPCR |
| 疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
| BLEEDING DISORDER, PLATELET-TYPE, 18 | 0.24 | 1 | 0 | ORPHANET_UNIPROT |
| Leukocyte Adhesion Deficiency, Type III | 0.08 | 0 | 0 | MGD |
| Gout | 0.002367032 | 1 | 1 | GAD |
| Congenital leukocyte adherence deficiency | 0.000271442 | 1 | 0 | BeFree |
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