PHLPP2是一种伪酸酶,在甲状动物祖先中失去了活性
Tarik Husremović1, Vanessa Meier1, Lucas Piëch1,2
1Max Perutz Labs, University of Vienna and Medical University of Vienna, Vienna 1030, Austria.
概括
PHLPP2缺乏催化活性,是一种伪酸酶,挑战其作为瘤抑制剂的作用. 研究应该集中在PHLPP1和PHLPP2上.
科学领域:
- 生物化学 生物化学
- 分子生物学分子生物学
- 癌症研究 癌症研究
背景情况:
- 氨基酸3-激酶 (PI3K) /Akt通路调节细胞生长,在癌症中被过度激活.
- 普莱克斯特林同源域氨酸丰富的重复含有蛋白质酸酶 (PHLPP) 被认为是通过抑制Akt的瘤抑制剂.
- PHLPP功能的关键方面,包括金属离子固体测量,机制和特异性,仍然是未知的.
研究的目的:
- 阐明PHLPP蛋白的酶活性,金属离子结合和生物作用.
- 通过癌症基因组学数据,研究PHLPP1和PHLPP2的拟议瘤抑制功能.
- 了解PHLPPs的进化历史和潜在的非催化功能.
主要方法:
- 在体外酶分析测试以确定PHLPP2的催化活性.
- 用X射线结晶学识别PHLPP2.2中结合的金属离子.
- 对癌症基因组学数据的分析,以评估PHLPP1和PHLPP2在瘤发生中的作用.
- 遗传学和遗传学分析,以追踪PHLPP的进化和识别共同进化的基因.
主要成果:
- 发现PHLPP2是一种伪酸酶,没有体外催化活性,在其活性部位中具有单个离子.
- 癌症基因组学数据不支持PHLPP1或PHLPP2作为瘤抑制剂.
- 遗传学分析表明,一种古老的酸酶祖先在甲基动物中失去了活性;PHLPP2可能保留基质结合.
- 遗传学表明PHLPP2在膜上起着支架作用.
结论:
- PHLPP2是一种催化不活的伪酸酶,解释了之前的研究不一致性.
- 建议的PHLPP1和PHLPP2的瘤抑制作用没有得到当前癌症基因组学数据的支持.
- 未来的研究应该探索PHLPP1和PHLPP2的非催化,潜在的支架功能.
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