摘要
国际顶级学术期刊《PLOSGENEtics》发表了复旦大学生命科学学院王陈继青年副研究员的一篇研究论文，研究成果揭示了前列腺癌中SPOP基因突变促进肿瘤的部分潜在分子机制。复旦大学生命科学学院金晓锋博士和王洁博士为本文的共同第一作者，王陈继青年副研究员和余龙教授为本文的共同通讯作者。
Next-generation sequencing of the exome and genome of prostate cancers has identified numerous genetic alternations. SPOP (Speckle-type POZ Protein) was one of the most frequently mutated genes in primary prostate cancer, suggesting SPOP is a potential driver of prostate cancer development and progression. However, how SPOP mutations contribute to prostate cancer pathogenesis remains poorly understood. SPOP acts as an adaptor protein of the CUL3-RBX1 E3 ubiquitin ligase complex that generally recruits substrates for ubiquitination and subsequent degradation. ER-localized isoform of the formin protein inverted formin 2 (INF2) mediates actin polymerization at ER-mitochondria intersections and facilitates DRP1 recruitment to mitochondria, which is a critical step in mitochondrial fission. Here, we revealed that SPOP recognizes a Ser/Thr (S/T)-rich motif in the C-terminal region of INF2 and triggers atypical polyubiquitination of INF2. These ubiquitination modifications do not lead to INF2 instability, but rather reduces INF2 localization in ER and mitochondrially associated DRP1 puncta formation, therefore abrogates its ability to facilitate mitochondrial fission. INF2 mutant escaping from SPOP-mediated ubiquitination is more potent in prompting mitochondrial fission. Moreover, prostate cancer-associated SPOP mutants increase INF2 localization in ER and promote mitochondrial fission, probably through a dominant-negative effect to inhibit endogenous SPOP. Moreover, INF2 is important for SPOP inactivation-induced prostate cancer cell migration and invasion. These findings reveal novel molecular events underlying the regulation of INF2 function and localization, and provided insights in understanding the relationship between SPOP mutations and dysregulation of mitochondrial dynamics in prostate cancer.
出处
《现代生物医学进展》
CAS
2017年第27期I0004-I0004,共1页
Progress in Modern Biomedicine
关键词
前列腺癌
分子机制
线粒体
生命科学学院
调控
分裂
复旦大学
研究论文
Mitochondria,Prostate cancer,Ubiquitination,DU145 cells,Prostate gland,Lentivirus,293T cells,Cancer cell migration
