The F. M. Kirby Neurobiology Center, Boston Children's Hospital, Department of Neurology, Harvard Medical School, Boston, MA 02115, USA.
Cell Res. 2012 Oct;22(10):1410-2. doi: 10.1038/cr.2012.91. Epub 2012 Jun 12.
In a recent issue of Nature, Hao et al. report an unexpected link between the secreted stem cell factor/Wnt agonist R-spondin and Wnt receptors through the transmembrane ZNRF3 protein, a RING finger ubiquitin ligase. ZNRF3 acts to turn over Frizzled and LRP6 receptors. R-spondin binds to ZNRF3, in addition to transmembrane LGR4/5 receptors, to antagonize degradation of the Wnt receptors by ZNRF3, thereby resulting in increased Frizzled and LRP6 levels and a greater Wnt response.
在最近一期的《自然》杂志上,Hao 等人报道了一个出人意料的联系,即分泌的干细胞因子/Wnt 激动剂 R-spondin 通过跨膜 ZNRF3 蛋白(一种 RING 指泛素连接酶)与 Wnt 受体相连。ZNRF3 作用于翻转 Frizzled 和 LRP6 受体。R-spondin 除了与跨膜 LGR4/5 受体结合外,还与 ZNRF3 结合,拮抗 ZNRF3 对 Wnt 受体的降解,从而导致 Frizzled 和 LRP6 水平升高,Wnt 反应增强。