LRP6(低密度脂蛋白受体相关蛋白6)是Wnt信号通路中的关键受体,属于LRP基因家族(低密度脂蛋白受体相关蛋白家族)。该家族成员均为单次跨膜蛋白,具有相似的胞外配体结合域结构,主要参与细胞信号转导和内吞作用。LRP6与Wnt蛋白结合后,与卷曲蛋白(Frizzled)共同形成受体复合物,激活经典的Wnt/β-catenin通路,调控胚胎发育、细胞增殖、分化和组织稳态。其胞内段含有多个PPPSP基序,可被GSK3β磷酸化并招募轴蛋白(Axin),从而抑制β-catenin降解,使其入核激活靶基因转录。LRP6突变会导致功能异常,如错义突变G171V会减弱Wnt信号传导,与骨质疏松、冠状动脉疾病相关;而功能获得性突变(如R611C)可能过度激活Wnt通路,与多种癌症(结直肠癌、乳腺癌)发生相关。LRP6表达异常会显著影响机体:过表达会持续激活Wnt通路,促进肿瘤发生和转移,同时可能抑制成骨细胞分化;而表达降低则导致Wnt信号减弱,影响胚胎发育(如神经管缺陷)和骨形成(如骨质疏松)。该基因还与阿尔茨海默病相关,因其参与调节淀粉样前体蛋白代谢。LRP家族共性包括:均含有EGF重复序列和β-螺旋桨结构域,参与多种信号通路(如Wnt、Hedgehog)和脂质代谢,在发育和疾病中发挥核心作用。
This gene encodes a member of the low density lipoprotein (LDL) receptor gene family. LDL receptors are transmembrane cell surface proteins involved in receptor-mediated endocytosis of lipoprotein and protein ligands. The protein encoded by this gene functions as a receptor or, with Frizzled, a co-receptor for Wnt and thereby transmits the canonical Wnt/beta-catenin signaling cascade. Through its interaction with the Wnt/beta-catenin signaling cascade this gene plays a role in the regulation of cell differentiation, proliferation, and migration and the development of many cancer types. This protein undergoes gamma-secretase dependent RIP- (regulated intramembrane proteolysis) processing but the precise locations of the cleavage sites have not been determined.[provided by RefSeq, Dec 2009]
该基因编码的低密度脂蛋白(LDL)受体基因家族的一个成员。 LDL受体是参与脂蛋白和蛋白质配体的受体介导的胞吞作用的跨膜细胞表面蛋白。由该基因的功能作为受体或与卷曲,共受体的Wnt和由此编码的蛋白质发送经典Wnt /β-连环蛋白信号传导级联。通过与Wnt基因/β-连环蛋白信号级联相互作用这个基因在细胞分化,增殖和迁移以及许多癌症类型的发育的调控作用。这种蛋白质经受γ分泌依赖RIP-(调节膜内蛋白水解)的处理,但在切割位点的精确位置尚未确定。[通过的RefSeq,2009年12月提供]
LRP6基因(以及对应的蛋白质)的细胞分布位置:
LRP6基因的本体(GO)信息:
名称 |
---|
4310 Wnt signaling pathway [PATH:hsa04310] |
名称 |
---|
disassembly of the destruction complex and recruitment of AXIN to the membrane |
Disease |
Diseases of signal transduction |
negative regulation of TCF-dependent signaling by WNT ligand antagonists |
regulation of FZD by ubiquitination |
RNF mutants show enhanced WNT signaling and proliferation |
Signal Transduction |
Signaling by Wnt |
Signaling by WNT in cancer |
TCF dependent signaling in response to WNT |
疾病名称 | 关系值 | NofPmids | NofSnps | 来源 |
CORONARY ARTERY DISEASE, AUTOSOMAL DOMINANT 2 (disorder) | 0.36 | 1 | 4 | CLINVAR_CTD_human_UNIPROT |
Neural tube defect, folate-sensitive | 0.08 | 0 | 0 | MGD |
FATTY LIVER DISEASE, NONALCOHOLIC, SUSCEPTIBILITY TO, 1 | 0.08 | 0 | 0 | MGD |
Age related macular degeneration | 0.007729856 | 2 | 0 | BeFree_GAD_LHGDN |
Coronary Artery Disease | 0.005905708 | 5 | 1 | BeFree_GAD_LHGDN |
Alzheimer's Disease | 0.005091382 | 1 | 0 | GAD_LHGDN |
Degenerative polyarthritis | 0.004734064 | 2 | 0 | GAD |
Osteoporosis | 0.003181358 | 4 | 0 | BeFree_GAD |
Microphthalmos | 0.002367032 | 1 | 0 | GAD |
Congenital ocular coloboma (disorder) | 0.002367032 | 1 | 0 | GAD |
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