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Okajima K, Aihara Y, Takayama Y, Nakajima M, Kashojiya S, Hikima T, Oroguchi T, Kobayashi A, Sekiguchi Y, Yamamoto M, Suzuki T, Nagatani A, Nakasako M, Tokutomi S. Light-induced conformational changes of LOV1 (light oxygen voltage-sensing domain 1) and LOV2 relative to the kinase domain and regulation of kinase activity in Chlamydomonas phototropin. J Biol Chem 2014; 289:413-22. [PMID: 24285544 PMCID: PMC3879564 DOI: 10.1074/jbc.m113.515403] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Revised: 11/25/2013] [Indexed: 01/27/2023] Open
Abstract
Phototropin (phot), a blue light (BL) receptor in plants, has two photoreceptive domains named LOV1 and LOV2 as well as a Ser/Thr kinase domain (KD) and acts as a BL-regulated protein kinase. A LOV domain harbors a flavin mononucleotide that undergoes a cyclic photoreaction upon BL excitation via a signaling state in which the inhibition of the kinase activity by LOV2 is negated. To understand the molecular mechanism underlying the BL-dependent activation of the kinase, the photochemistry, kinase activity, and molecular structure were studied with the phot of Chlamydomonas reinhardtii. Full-length and LOV2-KD samples of C. reinhardtii phot showed cyclic photoreaction characteristics with the activation of LOV- and BL-dependent kinase. Truncation of LOV1 decreased the photosensitivity of the kinase activation, which was well explained by the fact that the signaling state lasted for a shorter period of time compared with that of the phot. Small angle x-ray scattering revealed monomeric forms of the proteins in solution and detected BL-dependent conformational changes, suggesting an extension of the global molecular shapes of both samples. Constructed molecular model of full-length phot based on the small angle x-ray scattering data proved the arrangement of LOV1, LOV2, and KD for the first time that showed a tandem arrangement both in the dark and under BL irradiation. The models suggest that LOV1 alters its position relative to LOV2-KD under BL irradiation. This finding demonstrates that LOV1 may interact with LOV2 and modify the photosensitivity of the kinase activation through alteration of the duration of the signaling state in LOV2.
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Affiliation(s)
- Koji Okajima
- From the Department of Biological Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
- RIKEN Harima Institute, SPring-8, 1-1-1 Kouto, Mikaduki, Sayo, Hyogo 679-5148, Japan
| | - Yusuke Aihara
- the Department of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, and
| | - Yuki Takayama
- RIKEN Harima Institute, SPring-8, 1-1-1 Kouto, Mikaduki, Sayo, Hyogo 679-5148, Japan
- the Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Kanagawa 223-8522, Japan
| | - Mihoko Nakajima
- From the Department of Biological Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
| | - Sachiko Kashojiya
- From the Department of Biological Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
- RIKEN Harima Institute, SPring-8, 1-1-1 Kouto, Mikaduki, Sayo, Hyogo 679-5148, Japan
| | - Takaaki Hikima
- RIKEN Harima Institute, SPring-8, 1-1-1 Kouto, Mikaduki, Sayo, Hyogo 679-5148, Japan
| | - Tomotaka Oroguchi
- RIKEN Harima Institute, SPring-8, 1-1-1 Kouto, Mikaduki, Sayo, Hyogo 679-5148, Japan
- the Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Kanagawa 223-8522, Japan
| | - Amane Kobayashi
- RIKEN Harima Institute, SPring-8, 1-1-1 Kouto, Mikaduki, Sayo, Hyogo 679-5148, Japan
- the Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Kanagawa 223-8522, Japan
| | - Yuki Sekiguchi
- RIKEN Harima Institute, SPring-8, 1-1-1 Kouto, Mikaduki, Sayo, Hyogo 679-5148, Japan
- the Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Kanagawa 223-8522, Japan
| | - Masaki Yamamoto
- RIKEN Harima Institute, SPring-8, 1-1-1 Kouto, Mikaduki, Sayo, Hyogo 679-5148, Japan
| | - Tomomi Suzuki
- the Department of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, and
| | - Akira Nagatani
- the Department of Botany, Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan, and
| | - Masayoshi Nakasako
- RIKEN Harima Institute, SPring-8, 1-1-1 Kouto, Mikaduki, Sayo, Hyogo 679-5148, Japan
- the Department of Physics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Kanagawa 223-8522, Japan
| | - Satoru Tokutomi
- From the Department of Biological Science, Graduate School of Science, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan
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Wang H, Chen Y, Lin P, Li L, Zhou G, Liu G, Logsdon C, Jin J, Abbruzzese JL, Tan TH, Wang H. The CUL7/F-box and WD repeat domain containing 8 (CUL7/Fbxw8) ubiquitin ligase promotes degradation of hematopoietic progenitor kinase 1. J Biol Chem 2013; 289:4009-17. [PMID: 24362026 DOI: 10.1074/jbc.m113.520106] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
HPK1, a member of mammalian Ste20-like serine/threonine kinases, is lost in >95% pancreatic cancer through proteasome-mediated degradation. However, the mechanism of HPK1 loss has not been defined. The aims of this study are to identify the ubiquitin ligase and to examine the mechanisms that targets HPK1 degradation. We found that the CUL7/Fbxw8 ubiquitin ligase targeted HPK1 for degradation via the 26 S proteasome. The ubiquitination of HPK1 required its kinase activity and autophosphorylation. Wild-type protein phosphatase 4 (PP4), but not the phosphatase-dead PP4 mutant, PP4-RL, inhibits the interaction of Fbxw8 with HPK1 and Fbxw8-mediated ubiquitination of HPK1. In addition, we showed that Thr-355 of HPK1 is a key PP4 dephosphorylation site, through which CUL7/Fbxw8 ubiquitin ligase and PP4 regulates HPK1 stability. Knockdown of Fbxw8 restores endogenous HPK1 protein expression and inhibits cell proliferation of pancreatic cancer cells. Our study demonstrated that targeted degradation of HPK1 by the CUL7/Fbxw8 ubiquitin ligase constitutes a negative-feedback loop to restrain the activity of HPK1 and that CUL7/Fbxw8 ubiquitin ligase promotes pancreatic cancer cell proliferation. CUL7/Fbxw8 ubiquitin ligase-mediated HPK1 degradation revealed a direct link and novel role of CUL7/Fbxw8 ubiquitin ligase in the MAPK pathway, which plays a critical role in cell proliferation and differentiation.
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Affiliation(s)
- Hua Wang
- From the Departments of Gastrointestinal Medical Oncology
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Li D, Jin L, Alesi GN, Kim YM, Fan J, Seo JH, Wang D, Tucker M, Gu TL, Lee BH, Taunton J, Magliocca KR, Chen ZG, Shin DM, Khuri FR, Kang S. The prometastatic ribosomal S6 kinase 2-cAMP response element-binding protein (RSK2-CREB) signaling pathway up-regulates the actin-binding protein fascin-1 to promote tumor metastasis. J Biol Chem 2013; 288:32528-32538. [PMID: 24085294 DOI: 10.1074/jbc.m113.500561] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Metastasis is the leading cause of death in patients with breast, lung, and head and neck cancers. However, the molecular mechanisms underlying metastases in these cancers remain unclear. We found that the p90 ribosomal S6 kinase 2 (RSK2)-cAMP response element-binding protein (CREB) pathway is commonly activated in diverse metastatic human cancer cells, leading to up-regulation of a CREB transcription target Fascin-1. We also observed that the protein expression patterns of RSK2 and Fascin-1 correlate in primary human tumor tissue samples from head and neck squamous cell carcinoma patients. Moreover, knockdown of RSK2 disrupts filopodia formation and bundling in highly invasive cancer cells, leading to attenuated cancer cell invasion in vitro and tumor metastasis in vivo, whereas expression of Fascin-1 significantly rescues these phenotypes. Furthermore, targeting RSK2 with the small molecule RSK inhibitor FMK-MEA effectively attenuated the invasive and metastatic potential of cancer cells in vitro and in vivo, respectively. Taken together, our findings for the first time link RSK2-CREB signaling to filopodia formation and bundling through the up-regulation of Fascin-1, providing a proinvasive and prometastatic advantage to human cancers. Therefore, protein effectors of the RSK2-CREB-Fascin-1 pathway represent promising biomarkers and therapeutic targets in the clinical prognosis and treatment of metastatic human cancers.
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Affiliation(s)
- Dan Li
- From the Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Lingtao Jin
- From the Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Gina N Alesi
- From the Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Young-Mee Kim
- From the Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Jun Fan
- From the Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Jae Ho Seo
- From the Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Dongsheng Wang
- From the Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Meghan Tucker
- Cell Signaling Technology, Inc., Danvers, Massachusetts 01923
| | - Ting-Lei Gu
- Cell Signaling Technology, Inc., Danvers, Massachusetts 01923
| | - Benjamin H Lee
- the Novartis Institutes for BioMedical Research, Cambridge, Massachusetts 02139
| | - Jack Taunton
- the Department of Cellular and Molecular Pharmacology, University of California at San Francisco, San Francisco, California 94107
| | - Kelly R Magliocca
- the Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Zhuo G Chen
- From the Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Dong M Shin
- From the Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Fadlo R Khuri
- From the Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Sumin Kang
- From the Department of Hematology and Medical Oncology, Winship Cancer Institute, Emory University School of Medicine, Atlanta, Georgia 30322,.
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