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Lee Y, Park J, Lee G, Yoon S, Min CK, Kim TG, Yamamoto T, Kim DH, Lee KW, Eom SH. S92 phosphorylation induces structural changes in the N-terminus domain of human mitochondrial calcium uniporter. Sci Rep 2020; 10:9131. [PMID: 32499574 PMCID: PMC7272466 DOI: 10.1038/s41598-020-65994-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2019] [Accepted: 05/08/2020] [Indexed: 01/07/2023] Open
Abstract
The mitochondrial calcium uniporter (MCU) plays essential roles in mitochondrial calcium homeostasis and regulates cellular functions, such as energy synthesis, cell growth, and development. Thus, MCU activity is tightly controlled by its regulators as well as post-translational modification, including phosphorylation by protein kinases such as proline-rich tyrosine kinase 2 (Pyk2) and AMP-activated protein kinase (AMPK). In our in vitro kinase assay, the MCU N-terminal domain (NTD) was phosphorylated by protein kinase C isoforms (PKCβII, PKCδ, and PKCε) localized in the mitochondrial matrix. In addition, we found the conserved S92 was phosphorylated by the PKC isoforms. To reveal the structural effect of MCU S92 phosphorylation (S92p), we determined crystal structures of the MCU NTD of S92E and D119A mutants and analysed the molecular dynamics simulation of WT and S92p. We observed conformational changes of the conserved loop2-loop4 (L2-L4 loops) in MCU NTDS92E, NTDD119A, and NTDS92p due to the breakage of the S92-D119 hydrogen bond. The results suggest that the phosphorylation of S92 induces conformational changes as well as enhancements of the negative charges at the L2-L4 loops, which may affect the dimerization of two MCU-EMRE tetramers.
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Affiliation(s)
- Youngjin Lee
- 0000 0001 1033 9831grid.61221.36School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005 Republic of Korea ,0000 0001 1033 9831grid.61221.36Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005 Republic of Korea ,0000 0004 0636 3099grid.249967.7Infection and Immunity Research Laboratory, Metabolic Regulation Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon, 34141 Republic of Korea
| | - Jongseo Park
- 0000 0001 1033 9831grid.61221.36School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005 Republic of Korea ,0000 0001 1033 9831grid.61221.36Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005 Republic of Korea
| | - Gihwan Lee
- 0000 0001 0661 1492grid.256681.eDivision of Life Science, Division of Applied Life Science (BK21 Plus), Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Research Institute of Natural Science (RINS), Gyeongsang National University (GNU), 501 Jinju-daero, Jinju, 52828 Republic of Korea
| | - Sanghwa Yoon
- 0000 0001 0661 1492grid.256681.eDivision of Life Science, Division of Applied Life Science (BK21 Plus), Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Research Institute of Natural Science (RINS), Gyeongsang National University (GNU), 501 Jinju-daero, Jinju, 52828 Republic of Korea
| | - Choon Kee Min
- 0000 0001 1033 9831grid.61221.36School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005 Republic of Korea ,0000 0001 1033 9831grid.61221.36Systems Biology Research Center, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005 Republic of Korea
| | - Tae Gyun Kim
- 0000 0001 1033 9831grid.61221.36School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005 Republic of Korea ,0000 0001 1033 9831grid.61221.36Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005 Republic of Korea ,0000 0000 9805 2626grid.250464.1Present Address: Molecular Cryo-Electron Microscopy Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Kunigami 904-0495 Japan
| | - Takenori Yamamoto
- 0000 0001 1092 3579grid.267335.6Institute for Genome Research, Tokushima University, Kuramotocho-3, Tokushima, 770-8503 Japan ,0000 0001 1092 3579grid.267335.6Faculty of Pharmaceutical Sciences, Tokushima University, Shomachi-1, Tokushima, 770-8505 Japan
| | - Do Han Kim
- 0000 0001 1033 9831grid.61221.36School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005 Republic of Korea ,0000 0001 1033 9831grid.61221.36Systems Biology Research Center, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005 Republic of Korea
| | - Keun Woo Lee
- 0000 0001 0661 1492grid.256681.eDivision of Life Science, Division of Applied Life Science (BK21 Plus), Plant Molecular Biology and Biotechnology Research Center (PMBBRC), Research Institute of Natural Science (RINS), Gyeongsang National University (GNU), 501 Jinju-daero, Jinju, 52828 Republic of Korea
| | - Soo Hyun Eom
- 0000 0001 1033 9831grid.61221.36School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005 Republic of Korea ,0000 0001 1033 9831grid.61221.36Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005 Republic of Korea
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Qiu S, Zeng B. Advances in understanding of the oxysterol-binding protein homologous in yeast and filamentous fungi. Int Microbiol 2019; 22:169-179. [PMID: 30810998 DOI: 10.1007/s10123-019-00056-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2018] [Revised: 01/02/2019] [Accepted: 01/03/2019] [Indexed: 01/14/2023]
Abstract
Oxysterol-binding protein is an important non-vesicular trafficking protein involved in the transportation of lipids in eukaryotic cells. Oxysterol-binding protein is identified as oxysterol-binding protein-related proteins (ORPs) in mammals and oxysterol-binding protein homologue (Osh) in yeast. Research has described the function and structure of oxysterol-binding protein in mammals and yeast, but little information about the protein's structure and function in filamentous fungi has been reported. This article focuses on recent advances in the research of Osh proteins in yeast and filamentous fungi, such as Aspergillus oryzae, Aspergillus nidulans, and Candida albicans. Furthermore, we point out some problems in the field, summarizing the membrane contact sites (MCS) of Osh proteins in yeast, and consider the future of Osh protein development.
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Affiliation(s)
- Shangkun Qiu
- Jiangxi Province Key Laboratory Bioprocess Engineering, Jiangxi Science and Technology Normal University, Nanchang, 330013, China
| | - Bin Zeng
- Jiangxi Province Key Laboratory Bioprocess Engineering, Jiangxi Science and Technology Normal University, Nanchang, 330013, China.
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Lee Y, Min CK, Kim TG, Song HK, Lim Y, Kim D, Shin K, Kang M, Kang JY, Youn HS, Lee JG, An JY, Park KR, Lim JJ, Kim JH, Kim JH, Park ZY, Kim YS, Wang J, Kim DH, Eom SH. Structure and function of the N-terminal domain of the human mitochondrial calcium uniporter. EMBO Rep 2015; 16:1318-33. [PMID: 26341627 PMCID: PMC4662854 DOI: 10.15252/embr.201540436] [Citation(s) in RCA: 74] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Accepted: 08/07/2015] [Indexed: 01/04/2023] Open
Abstract
The mitochondrial calcium uniporter (MCU) is responsible for mitochondrial calcium uptake and homeostasis. It is also a target for the regulation of cellular anti-/pro-apoptosis and necrosis by several oncogenes and tumour suppressors. Herein, we report the crystal structure of the MCU N-terminal domain (NTD) at a resolution of 1.50 Å in a novel fold and the S92A MCU mutant at 2.75 Å resolution; the residue S92 is a predicted CaMKII phosphorylation site. The assembly of the mitochondrial calcium uniporter complex (uniplex) and the interaction with the MCU regulators such as the mitochondrial calcium uptake-1 and mitochondrial calcium uptake-2 proteins (MICU1 and MICU2) are not affected by the deletion of MCU NTD. However, the expression of the S92A mutant or a NTD deletion mutant failed to restore mitochondrial Ca(2+) uptake in a stable MCU knockdown HeLa cell line and exerted dominant-negative effects in the wild-type MCU-expressing cell line. These results suggest that the NTD of MCU is essential for the modulation of MCU function, although it does not affect the uniplex formation.
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Affiliation(s)
- Youngjin Lee
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Choon Kee Min
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Systems Biology Research Center, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Tae Gyun Kim
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Hong Ki Song
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Systems Biology Research Center, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Yunki Lim
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Systems Biology Research Center, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Dongwook Kim
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Systems Biology Research Center, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Kahee Shin
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Systems Biology Research Center, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Moonkyung Kang
- Graduate School of New Drug Discovery & Development, Chungnam National University, Daejon, Korea
| | - Jung Youn Kang
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Hyung-Seop Youn
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Jung-Gyu Lee
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Jun Yop An
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Kyoung Ryoung Park
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Jia Jia Lim
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Ji Hun Kim
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Ji Hye Kim
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Zee Yong Park
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Yeon-Soo Kim
- Graduate School of New Drug Discovery & Development, Chungnam National University, Daejon, Korea
| | - Jimin Wang
- Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Department of Molecular Biochemistry and Biophysics, Yale University, New Haven, CT, USA
| | - Do Han Kim
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Systems Biology Research Center, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
| | - Soo Hyun Eom
- School of Life Sciences, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Steitz Center for Structural Biology, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea Department of Chemistry, Gwangju Institute of Science and Technology (GIST), Gwangju, Korea
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Tong J, Yang H, Yang H, Eom SH, Im YJ. Structure of Osh3 reveals a conserved mode of phosphoinositide binding in oxysterol-binding proteins. Structure 2013; 21:1203-13. [PMID: 23791945 DOI: 10.1016/j.str.2013.05.007] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Revised: 04/25/2013] [Accepted: 05/08/2013] [Indexed: 11/27/2022]
Abstract
The oxysterol-binding protein (OSBP)-related proteins (ORPs) are conserved from yeast to humans, and implicated in the regulation of lipid homeostasis and in signaling pathways. Saccharomyces cerevisiae has seven ORPs (Osh1-Osh7) that share one unknown essential function. Here, we report the 1.5-2.3 Å structures of the PH domain and ORD (OSBP-related domain) of yeast Osh3 in apo-form or in complex with phosphatidylinositol 4-phosphate (PI[4]P). Osh3 recognizes PI(4)P by the highly conserved residues in the tunnel of ORD whereas it lacks sterol binding due to the narrow hydrophobic tunnel. Yeast complementation tests suggest that PI(4)P binding to PH and ORD is essential for function. This study suggests that the unifying feature in all ORP homologs is the binding of PI(4)P to ORD and sterol binding is additional to certain homologs. Structural modeling of full-length Osh3 is consistent with the concept that Osh3 is a lipid transfer protein or regulator in membrane contact sites.
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Affiliation(s)
- Junsen Tong
- College of Pharmacy, Chonnam National University, Gwangju 500-757, South Korea
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