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Lee S, Jeong AL, Park JS, Han S, Jang CY, Kim KI, Kim Y, Park JH, Lim JS, Lee MS, Yang Y. IK-guided PP2A suppresses Aurora B activity in the interphase of tumor cells. Cell Mol Life Sci 2016; 73:3375-86. [PMID: 26906715 PMCID: PMC11108362 DOI: 10.1007/s00018-016-2162-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Revised: 01/13/2016] [Accepted: 02/09/2016] [Indexed: 01/02/2023]
Abstract
Aurora B activation is triggered at the mitotic entry and required for proper microtubule-kinetochore attachment at mitotic phase. Therefore, Aurora B should be in inactive form in interphase to prevent aberrant cell cycle progression. However, it is unclear how the inactivation of Aurora B is sustained during interphase. In this study, we find that IK depletion-induced mitotic arrest leads to G2 arrest by Aurora B inhibition, indicating that IK depletion enhances Aurora B activation before mitotic entry. IK binds to Aurora B, and colocalizes on the nuclear foci during interphase. Our data further show that IK inhibits Aurora B activation through recruiting PP2A into IK and Aurora B complex. It is thus believed that IK, as a scaffold protein, guides PP2A into Aurora B to suppress its activity in interphase until mitotic entry.
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Affiliation(s)
- Sunyi Lee
- Division of Biological Sciences, Department of Life Systems, Research Center for Women's Disease, Sookmyung Women's University, Seoul, 140-742, Republic of Korea
| | - Ae Lee Jeong
- Division of Biological Sciences, Department of Life Systems, Research Center for Women's Disease, Sookmyung Women's University, Seoul, 140-742, Republic of Korea
| | - Jeong Su Park
- Division of Biological Sciences, Department of Life Systems, Research Center for Women's Disease, Sookmyung Women's University, Seoul, 140-742, Republic of Korea
| | - Sora Han
- Division of Biological Sciences, Department of Life Systems, Research Center for Women's Disease, Sookmyung Women's University, Seoul, 140-742, Republic of Korea
| | - Chang-Young Jang
- Research Center for Cell Fate Control, College of Pharmacy, Sookmyung Women's University, Seoul, 140-742, Republic of Korea
| | - Keun Il Kim
- Division of Biological Sciences, Department of Life Systems, Research Center for Women's Disease, Sookmyung Women's University, Seoul, 140-742, Republic of Korea
| | - Yonghwan Kim
- Division of Biological Sciences, Department of Life Systems, Research Center for Women's Disease, Sookmyung Women's University, Seoul, 140-742, Republic of Korea
| | - Jong Hoon Park
- Division of Biological Sciences, Department of Life Systems, Research Center for Women's Disease, Sookmyung Women's University, Seoul, 140-742, Republic of Korea
| | - Jong-Seok Lim
- Division of Biological Sciences, Department of Life Systems, Research Center for Women's Disease, Sookmyung Women's University, Seoul, 140-742, Republic of Korea
| | - Myung Sok Lee
- Division of Biological Sciences, Department of Life Systems, Research Center for Women's Disease, Sookmyung Women's University, Seoul, 140-742, Republic of Korea
| | - Young Yang
- Division of Biological Sciences, Department of Life Systems, Research Center for Women's Disease, Sookmyung Women's University, Seoul, 140-742, Republic of Korea.
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Novel differential transcript expression identified by LongSAGE in the mouse endometrium during the implantation window. Mol Biol Rep 2012; 40:651-63. [DOI: 10.1007/s11033-012-2104-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Accepted: 10/03/2012] [Indexed: 12/31/2022]
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