Protein phosphatase 4 (PP4) plays a crucial role in various cellular pathways, and its proper regulation is essential for optimal phosphorylation dynamics and supporting critical cellular pathways, including DNA double-strand break repair. A previously identified PP4 regulator, termed PP4 inhibitory protein (PP4IP), has been implicated in modulating PP4 activity. However, the biochemical properties of PP4IP and the details of its relationship with the PP4 complex remain poorly understood. In this study, we provide insights into the biochemical characteristics of PP4IP and investigate its physical interaction with PP4. Contrary to a previous report, we were not able to detect any ribonuclease activity in PP4IP purified from E. coli, insect, or mammalian cells. On the other hand, our findings reveal that PP4IP dimerization is required for its interaction with the PP4 complex, and that PP4R3α is a key mediator of this interaction. This study provides a clear understanding of the mechanism underlying PP4-PP4IP complex formation.
목차
Abstract 1. Introduction 2. Materials and Methods 2.1. Cell culture and chemicals 2.2. Plasmids and siRNAs transfection 2.3. Immunoblotting 2.4. Recombinant protein expression and purification 2.5. Immunoprecipitation 2.6. Ribonuclease activity assay 2.7. Proximity labeling and affinity enrichmentof biotinylated proteins 3. Results 3.1. PP4IP does not have ribonuclease activity in vitro 3.2. PP4IP homo-dimerization is necessaryfor the interaction with the PP4 complex 3.3. PP4R3α mediates the interaction betweenPP4IP and the PP4 complex 4. Discussion Acknowledgements References
키워드
Protein Phosphatase 4 Inhibitory ProteinDimerizationProximity LabelingProtein-Protein Interaction
저자
Jaehong Park [ Department of Biological Sciences, College of Natural Sciences, Chonnam National University, Gwangju, Korea ]
Dong-Hyun Lee [ Department of Biological Sciences, College of Natural Sciences, Chonnam National University/Research Center of Ecomimetics, Chonnam National University, Gwangju, Korea ]
Corresponding Author
조선대학교 기초과학연구원 [The Natural Science Research Institute of Chosun]
설립연도
2008
분야
자연과학>자연과학일반
소개
본 연구원은 기초과학을 진흥하기 위한 연구·교육 및 그 보급을 목적으로 한다. 이 목적을 달성하기 위하여 다음 각 호의 사업을 수행한다.
1. 기초과학 제 분야에 관한 조사와 연구
2. 기초과학에 관한 학술행사(학술대회, 학술세미나, 심포지엄, 초청강연회 등) 개최
3. 학문후속세대 및 일반인을 위한 기초과학 교육
4. 기관지『조선자연과학논문지』 발간
5. 『자연과학연구총서』, 『자연과학번역총서』 등 단행본 발간
6. 기타 본 연구원의 목적과 관련된 사업
간행물
간행물명
통합자연과학논문집(구 조선자연과학논문집) [Journal of Integrative Natural Science]