FAM122A通过螺旋形动图来抑制B55α/PP2A,确保细胞周期间相进展和检查点控制
Jason S Wasserman1, Bulat Faezov2,3, Kishan R Patel1
1Fels Cancer Institute for Personalized Medicine. Temple University Lewis Katz School of Medicine, Philadelphia, PA, USA.
通过阻断基质结合,FAM122A作为蛋白酸酶2A (PP2A) 的竞争性抑制剂. 这种蛋白质调节细胞循环的进展和DNA损伤反应.
科学领域:
- 分子生物学分子生物学
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 蛋白酸酶2A (PP2A) 对于去化蛋白质至关重要.
- B 调控子单元调解PP2A的基质识别.
- FAM122A被确定为B55α/PP2A的抑制剂.
研究的目的:
- 确定和描述FAM122A作为PP2A抑制剂的机制.
- 研究FAM122A在细胞循环调节和DNA损伤反应中的作用.
主要方法:
- 在FAM122A.中识别一个保存的基质图案.
- 对FAM122A-B55α相互作用的计算结构预测.
- 在体外测试中使用细胞解质来评估酶抑制.
- 对FAM122A缺乏细胞系和淘汰模型 (HEK293) 的分析.
主要成果:
- 在FAM122A中,一个保留的[RK]-V-x-x-[VI]-R基因对B55α结合至关重要.
- FAM122A作为一种竞争性抑制剂,防止基质结合和CDK基质的脱化,由B55α/PP2A.
- 缺乏FAM122A会影响细胞增殖,细胞循环进展 (G1/S和intra-S),并在复制应激期间减弱CHK1/CHK2激活.
结论:
- FAM122A是一种B55α/PP2A的短螺旋动机 (SHeM) 依存抑制剂.
- 通过阻断基板对接,FAM122A可以竞争性地抑制PP2A.
- 在DNA损伤反应和细胞周期进展中,FAM122A在抑制B55α功能方面发挥着重要作用.
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