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Abstract
Single-stranded DNA (ssDNA) is widely generated during DNA metabolisms including DNA replication, repair and recombination and is susceptible to digestion by nucleases and secondary structure formation. It is vital for DNA metabolism and genome stability that ssDNA is protected and stabilized, which are performed by the major ssDNA-binding protein, and replication protein A (RPA) in these processes. In addition, RPA-coated ssDNA also serves as a protein-protein-binding platform for coordinating multiple events during DNA metabolisms. However, little is known about whether and how the formation of RPA-ssDNA platform is regulated. Here we highlight our recent study of a novel RPA-binding protein, Regulator of Ty1 transposition 105 (Rtt105) in Saccharomyces cerevisiae, which regulates the RPA-ssDNA platform assembly at replication forks. We propose that Rtt105 functions as an "RPA chaperone" during DNA replication, likely also promoting the assembly of RPA-ssDNA platform in other processes in which RPA plays a critical role.
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Affiliation(s)
- Shuqi Li
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China.,Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, China.,Laboratory of Host-Pathogen Biology, The Rockefeller University, 1230 York Avenue, New York, NY, 10065, USA
| | - Ziqi Dong
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China
| | - Shuangshuang Yang
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China
| | - Jianxun Feng
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China
| | - Qing Li
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences and Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, China. .,Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, 100871, China.
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Li S, Xu Z, Xu J, Zuo L, Yu C, Zheng P, Gan H, Wang X, Li L, Sharma S, Chabes A, Li D, Wang S, Zheng S, Li J, Chen X, Sun Y, Xu D, Han J, Chan K, Qi Z, Feng J, Li Q. Rtt105 functions as a chaperone for replication protein A to preserve genome stability. EMBO J 2018; 37:embj.201899154. [PMID: 30065069 DOI: 10.15252/embj.201899154] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 06/28/2018] [Accepted: 07/06/2018] [Indexed: 02/05/2023] Open
Abstract
Generation of single-stranded DNA (ssDNA) is required for the template strand formation during DNA replication. Replication Protein A (RPA) is an ssDNA-binding protein essential for protecting ssDNA at replication forks in eukaryotic cells. While significant progress has been made in characterizing the role of the RPA-ssDNA complex, how RPA is loaded at replication forks remains poorly explored. Here, we show that the Saccharomyces cerevisiae protein regulator of Ty1 transposition 105 (Rtt105) binds RPA and helps load it at replication forks. Cells lacking Rtt105 exhibit a dramatic reduction in RPA loading at replication forks, compromised DNA synthesis under replication stress, and increased genome instability. Mechanistically, we show that Rtt105 mediates the RPA-importin interaction and also promotes RPA binding to ssDNA directly in vitro, but is not present in the final RPA-ssDNA complex. Single-molecule studies reveal that Rtt105 affects the binding mode of RPA to ssDNA These results support a model in which Rtt105 functions as an RPA chaperone that escorts RPA to the nucleus and facilitates its loading onto ssDNA at replication forks.
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Affiliation(s)
- Shuqi Li
- Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China
| | - Zhiyun Xu
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
| | - Jiawei Xu
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
| | - Linyu Zuo
- Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China.,Center for Quantitative Biology, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China
| | - Chuanhe Yu
- Department of Pediatrics and Department of Genetics and Development, Institute for Cancer Genetics, Columbia University College of Physicians and Surgeons, New York, NY, USA
| | - Pu Zheng
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
| | - Haiyun Gan
- Department of Pediatrics and Department of Genetics and Development, Institute for Cancer Genetics, Columbia University College of Physicians and Surgeons, New York, NY, USA
| | - Xuezheng Wang
- Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China
| | - Longtu Li
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
| | - Sushma Sharma
- Medical Biochemistry and Biophysics, Umeå University, Umeå, Sweden
| | - Andrei Chabes
- Medical Biochemistry and Biophysics, Umeå University, Umeå, Sweden
| | - Di Li
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
| | - Sheng Wang
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, Peking University, Beijing, China
| | - Sihao Zheng
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences and the Institute for Advanced Studies, Wuhan University, Wuhan, China
| | - Jinbao Li
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences and the Institute for Advanced Studies, Wuhan University, Wuhan, China
| | - Xuefeng Chen
- Hubei Key Laboratory of Cell Homeostasis, College of Life Sciences and the Institute for Advanced Studies, Wuhan University, Wuhan, China
| | - Yujie Sun
- State Key Laboratory of Membrane Biology, Biodynamic Optical Imaging Center (BIOPIC), School of Life Sciences, Peking University, Beijing, China
| | - Dongyi Xu
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
| | - Junhong Han
- Division of Abdominal Cancer, State Key Laboratory of Biotherapy, West China Hospital, Sichuan University, and National Collaborative Center for Biotherapy, Chengdu, China
| | - Kuiming Chan
- Department of Biomedical Sciences, City University of Hong Kong, Hong Kong, China
| | - Zhi Qi
- Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China.,Center for Quantitative Biology, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China
| | - Jianxun Feng
- Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China .,State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
| | - Qing Li
- Peking-Tsinghua Center for Life Sciences, Academy for Advanced Interdisciplinary Studies, Peking University, Beijing, China .,State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing, China
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