1
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Jiang B, Shen H, Chen Z, Yin L, Zan L, Rui L. Carboxyl terminus of HSC70-interacting protein (CHIP) down-regulates NF-κB-inducing kinase (NIK) and suppresses NIK-induced liver injury. J Biol Chem 2015; 290:11704-14. [PMID: 25792747 PMCID: PMC4416871 DOI: 10.1074/jbc.m114.635086] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 03/12/2015] [Indexed: 11/06/2022] Open
Abstract
Ser/Thr kinase NIK (NF-κB-inducing kinase) mediates the activation of the noncanonical NF-κB2 pathway, and it plays an important role in regulating immune cell development and liver homeostasis. NIK levels are extremely low in quiescent cells due to ubiquitin/proteasome-mediated degradation, and cytokines stimulate NIK activation through increasing NIK stability; however, regulation of NIK stability is not fully understood. Here we identified CHIP (carboxyl terminus of HSC70-interacting protein) as a new negative regulator of NIK. CHIP contains three N-terminal tetratricopeptide repeats (TPRs), a middle dimerization domain, and a C-terminal U-box. The U-box domain contains ubiquitin E3 ligase activity that promotes ubiquitination of CHIP-bound partners. We observed that CHIP bound to NIK via its TPR domain. In both HEK293 and primary hepatocytes, overexpression of CHIP markedly decreased NIK levels at least in part through increasing ubiquitination and degradation of NIK. Accordingly, CHIP suppressed NIK-induced activation of the noncanonical NF-κB2 pathway. CHIP also bound to TRAF3, and CHIP and TRAF3 acted coordinately to efficiently promote NIK degradation. The TPR but not the U-box domain was required for CHIP to promote NIK degradation. In mice, hepatocyte-specific overexpression of NIK resulted in liver inflammation and injury, leading to death, and liver-specific expression of CHIP reversed the detrimental effects of hepatic NIK. Our data suggest that CHIP/TRAF3/NIK interactions recruit NIK to E3 ligase complexes for ubiquitination and degradation, thus maintaining NIK at low levels. Defects in CHIP regulation of NIK may result in aberrant NIK activation in the liver, contributing to live injury, inflammation, and disease.
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Affiliation(s)
- Bijie Jiang
- From the National Beef Cattle Improvement Center, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China and the Departments of Molecular and Integrative Physiology and
| | - Hong Shen
- the Departments of Molecular and Integrative Physiology and
| | - Zheng Chen
- the Departments of Molecular and Integrative Physiology and
| | - Lei Yin
- the Departments of Molecular and Integrative Physiology and
| | - Linsen Zan
- From the National Beef Cattle Improvement Center, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China and
| | - Liangyou Rui
- the Departments of Molecular and Integrative Physiology and Internal Medicine, University of Michigan Medical School, Ann Arbor, Michigan 48109-0622
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2
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Bagheri-Yarmand R, Sinha KM, Gururaj AE, Ahmed Z, Rizvi YQ, Huang SC, Ladbury JE, Bogler O, Williams MD, Cote GJ, Gagel RF. A novel dual kinase function of the RET proto-oncogene negatively regulates activating transcription factor 4-mediated apoptosis. J Biol Chem 2015; 290:11749-61. [PMID: 25795775 DOI: 10.1074/jbc.m114.619833] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Indexed: 11/06/2022] Open
Abstract
The RET proto-oncogene, a tyrosine kinase receptor, is widely known for its essential role in cell survival. Germ line missense mutations, which give rise to constitutively active oncogenic RET, were found to cause multiple endocrine neoplasia type 2, a dominant inherited cancer syndrome that affects neuroendocrine organs. However, the mechanisms by which RET promotes cell survival and prevents cell death remain elusive. We demonstrate that in addition to cytoplasmic localization, RET is localized in the nucleus and functions as a tyrosine-threonine dual specificity kinase. Knockdown of RET by shRNA in medullary thyroid cancer-derived cells stimulated expression of activating transcription factor 4 (ATF4), a master transcription factor for stress-induced apoptosis, through activation of its target proapoptotic genes NOXA and PUMA. RET knockdown also increased sensitivity to cisplatin-induced apoptosis. We observed that RET physically interacted with and phosphorylated ATF4 at tyrosine and threonine residues. Indeed, RET kinase activity was required to inhibit the ATF4-dependent activation of the NOXA gene because the site-specific substitution mutations that block threonine phosphorylation increased ATF4 stability and activated its targets NOXA and PUMA. Moreover, chromatin immunoprecipitation assays revealed that ATF4 occupancy increased at the NOXA promoter in TT cells treated with tyrosine kinase inhibitors or the ATF4 inducer eeyarestatin as well as in RET-depleted TT cells. Together these findings reveal RET as a novel dual kinase with nuclear localization and provide mechanisms by which RET represses the proapoptotic genes through direct interaction with and phosphorylation-dependent inactivation of ATF4 during the pathogenesis of medullary thyroid cancer.
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Affiliation(s)
| | - Krishna M Sinha
- From the Department of Endocrine Neoplasia and Hormonal Disorders
| | | | - Zamal Ahmed
- the Department of Biochemistry and Molecular Biology and Center for Biomolecular Structure and Function, and
| | - Yasmeen Q Rizvi
- From the Department of Endocrine Neoplasia and Hormonal Disorders
| | - Su-Chen Huang
- From the Department of Endocrine Neoplasia and Hormonal Disorders
| | - John E Ladbury
- the Department of Biochemistry and Molecular Biology and Center for Biomolecular Structure and Function, and
| | | | - Michelle D Williams
- the Department of Pathology, University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030
| | - Gilbert J Cote
- From the Department of Endocrine Neoplasia and Hormonal Disorders
| | - Robert F Gagel
- From the Department of Endocrine Neoplasia and Hormonal Disorders
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3
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Butler PL, Staruschenko A, Snyder PM. Acetylation stimulates the epithelial sodium channel by reducing its ubiquitination and degradation. J Biol Chem 2015; 290:12497-503. [PMID: 25787079 DOI: 10.1074/jbc.m114.635540] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [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: 12/26/2014] [Indexed: 12/29/2022] Open
Abstract
The epithelial Na(+) channel (ENaC) functions as a pathway for Na(+) absorption in the kidney and lung, where it is crucial for Na(+) homeostasis and blood pressure regulation. ENaC is regulated in part through signaling pathways that control the ubiquitination state of ENaC lysines. A defect in ubiquitination causes Liddle syndrome, an inherited form of hypertension. Here we determined that α-, β-, and γENaC are also substrates for lysine acetylation. Trichostatin A (TSA), a histone deacetylase inhibitor, enhanced ENaC acetylation and increased ENaC abundance in the total cell lysate and at the cell surface. Moreover, TSA increased ENaC current in Fischer rat thyroid and kidney collecting duct epithelia. We found that HDAC7 is expressed in the kidney collecting duct, supporting a potential role for this histone deacetylase in ENaC regulation. HDAC7 overexpression reduced ENaC abundance and ENaC current, whereas ENaC abundance and current were increased by silencing of HDAC7. ENaC and HDAC7 form a complex, as detected by coimmunoprecipitation. We observed a reciprocal relationship between acetylation and ubiquitination; TSA reduced ENaC ubiquitination, whereas HDAC7 increased ubiquitination. By reducing ENaC ubiquitination, TSA decreased the rate of ENaC degradation. Thus, acetylation increases epithelial Na(+) absorption by antagonizing ENaC ubiquitination. This stabilizes ENaC, and hence, increases its abundance at the cell surface.
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Affiliation(s)
- Phillip L Butler
- From the Departments of Internal Medicine and Molecular Physiology and Biophysics, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242
| | | | - Peter M Snyder
- From the Departments of Internal Medicine and Molecular Physiology and Biophysics, University of Iowa Carver College of Medicine, Iowa City, Iowa 52242, the Iowa City Veterans Affairs Healthcare System, Iowa City, Iowa 52246, and
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4
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Park ES, Choi S, Shin B, Yu J, Yu J, Hwang JM, Yun H, Chung YH, Choi JS, Choi Y, Rho J. Tumor necrosis factor (TNF) receptor-associated factor (TRAF)-interacting protein (TRIP) negatively regulates the TRAF2 ubiquitin-dependent pathway by suppressing the TRAF2-sphingosine 1-phosphate (S1P) interaction. J Biol Chem 2015; 290:9660-73. [PMID: 25716317 DOI: 10.1074/jbc.m114.609685] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [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: 09/05/2014] [Indexed: 11/06/2022] Open
Abstract
The signaling pathway downstream of TNF receptor (TNFR) is involved in the induction of a wide range of cellular processes, including cell proliferation, activation, differentiation, and apoptosis. TNFR-associated factor 2 (TRAF2) is a key adaptor molecule in TNFR signaling complexes that promotes downstream signaling cascades, such as nuclear factor-κB (NF-κB) and mitogen-activated protein kinase activation. TRAF-interacting protein (TRIP) is a known cellular binding partner of TRAF2 and inhibits TNF-induced NF-κB activation. Recent findings that TRIP plays a multifunctional role in antiviral response, cell proliferation, apoptosis, and embryonic development have increased our interest in exploring how TRIP can affect the TNFR-signaling pathway on a molecular level. In our current study, we demonstrated that TRIP is negatively involved in the TNF-induced inflammatory response through the down-regulation of proinflammatory cytokine production. Here, we demonstrated that the TRAF2-TRIP interaction inhibits Lys(63)-linked TRAF2 ubiquitination by inhibiting TRAF2 E3 ubiquitin (Ub) ligase activity. The TRAF2-TRIP interaction inhibited the binding of sphingosine 1-phosphate, which is a cofactor of TRAF2 E3 Ub ligase, to the TRAF2 RING domain. Finally, we demonstrated that TRIP functions as a negative regulator of proinflammatory cytokine production by inhibiting TNF-induced NF-κB activation. These results indicate that TRIP is an important cellular regulator of the TNF-induced inflammatory response.
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Affiliation(s)
- Eui-Soon Park
- From the Department of Microbiology and Molecular Biology, Chungnam National University, Daejeon 305-764, Korea
| | - Seunga Choi
- From the Department of Microbiology and Molecular Biology, Chungnam National University, Daejeon 305-764, Korea
| | - Bongjin Shin
- From the Department of Microbiology and Molecular Biology, Chungnam National University, Daejeon 305-764, Korea
| | - Jungeun Yu
- From the Department of Microbiology and Molecular Biology, Chungnam National University, Daejeon 305-764, Korea
| | - Jiyeon Yu
- From the Department of Microbiology and Molecular Biology, Chungnam National University, Daejeon 305-764, Korea
| | - Jung-Me Hwang
- From the Department of Microbiology and Molecular Biology, Chungnam National University, Daejeon 305-764, Korea
| | - Hyeongseok Yun
- From the Department of Microbiology and Molecular Biology, Chungnam National University, Daejeon 305-764, Korea
| | - Young-Ho Chung
- the Division of Life Science, Korea Basic Science Institute, Daejeon 305-333, Korea, and
| | - Jong-Soon Choi
- the Division of Life Science, Korea Basic Science Institute, Daejeon 305-333, Korea, and
| | - Yongwon Choi
- the Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104
| | - Jaerang Rho
- From the Department of Microbiology and Molecular Biology, Chungnam National University, Daejeon 305-764, Korea,
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5
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Scazzari M, Amm I, Wolf DH. Quality control of a cytoplasmic protein complex: chaperone motors and the ubiquitin-proteasome system govern the fate of orphan fatty acid synthase subunit Fas2 of yeast. J Biol Chem 2015; 290:4677-4687. [PMID: 25564609 PMCID: PMC4335207 DOI: 10.1074/jbc.m114.596064] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [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: 07/11/2014] [Revised: 12/10/2014] [Indexed: 11/06/2022] Open
Abstract
For the assembly of protein complexes in the cell, the presence of stoichiometric amounts of the respective protein subunits is of utmost importance. A surplus of any of the subunits may trigger unspecific and harmful protein interactions and has to be avoided. A stoichiometric amount of subunits must finally be reached via transcriptional, translational, and/or post-translational regulation. Synthesis of saturated 16 and 18 carbon fatty acids is carried out by fatty acid synthase: in yeast Saccharomyces cerevisiae, a 2.6-MDa molecular mass assembly containing six protomers each of two different subunits, Fas1 (β) and Fas2 (α). The (α)6(β)6 complex carries six copies of all eight enzymatic activities required for fatty acid synthesis. The FAS1 and FAS2 genes in yeast are unlinked and map on two different chromosomes. Here we study the fate of the α-subunit of the complex, Fas2, when its partner, the β-subunit Fas1, is absent. Individual subunits of fatty acid synthase are proteolytically degraded when the respective partner is missing. Elimination of Fas2 is achieved by the proteasome. Here we show that a ubiquitin transfer machinery is required for Fas2 elimination. The major ubiquitin ligase targeting the superfluous Fas2 subunit to the proteasome is Ubr1. The ubiquitin-conjugating enzymes Ubc2 and Ubc4 assist the degradation process. The AAA-ATPase Cdc48 and the Hsp70 chaperone Ssa1 are crucially involved in the elimination of Fas2.
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Affiliation(s)
- Mario Scazzari
- From the Institut für Biochemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Ingo Amm
- From the Institut für Biochemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Dieter H Wolf
- From the Institut für Biochemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany.
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6
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Peng L, Yuan Z, Li Y, Ling H, Izumi V, Fang B, Fukasawa K, Koomen J, Chen J, Seto E. Ubiquitinated sirtuin 1 (SIRT1) function is modulated during DNA damage-induced cell death and survival. J Biol Chem 2015; 290:8904-12. [PMID: 25670865 DOI: 10.1074/jbc.m114.612796] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Indexed: 11/06/2022] Open
Abstract
Downstream signaling of physiological and pathological cell responses depends on post-translational modification such as ubiquitination. The mechanisms regulating downstream DNA damage response (DDR) signaling are not completely elucidated. Sirtuin 1 (SIRT1), the founding member of Class III histone deacetylases, regulates multiple steps in DDR and is closely associated with many physiological and pathological processes. However, the role of post-translational modification or ubiquitination of SIRT1 during DDR is unclear. We show that SIRT1 is dynamically and distinctly ubiquitinated in response to DNA damage. SIRT1 was ubiquitinated by the MDM2 E3 ligase in vitro and in vivo. SIRT1 ubiquitination under normal conditions had no effect on its enzymatic activity or rate of degradation; hypo-ubiquitination, however, reduced SIRT1 nuclear localization. Ubiquitination of SIRT1 affected its function in cell death and survival in response to DNA damage. Our results suggest that ubiquitination is required for SIRT1 function during DDR.
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Affiliation(s)
- Lirong Peng
- From the Department of Molecular Oncology, Moffitt Cancer Center and Research Institute, Tampa, Florida 33612
| | - Zhigang Yuan
- From the Department of Molecular Oncology, Moffitt Cancer Center and Research Institute, Tampa, Florida 33612
| | - Yixuan Li
- From the Department of Molecular Oncology, Moffitt Cancer Center and Research Institute, Tampa, Florida 33612
| | - Hongbo Ling
- From the Department of Molecular Oncology, Moffitt Cancer Center and Research Institute, Tampa, Florida 33612
| | - Victoria Izumi
- From the Department of Molecular Oncology, Moffitt Cancer Center and Research Institute, Tampa, Florida 33612
| | - Bin Fang
- From the Department of Molecular Oncology, Moffitt Cancer Center and Research Institute, Tampa, Florida 33612
| | - Kenji Fukasawa
- From the Department of Molecular Oncology, Moffitt Cancer Center and Research Institute, Tampa, Florida 33612
| | - John Koomen
- From the Department of Molecular Oncology, Moffitt Cancer Center and Research Institute, Tampa, Florida 33612
| | - Jiandong Chen
- From the Department of Molecular Oncology, Moffitt Cancer Center and Research Institute, Tampa, Florida 33612
| | - Edward Seto
- From the Department of Molecular Oncology, Moffitt Cancer Center and Research Institute, Tampa, Florida 33612
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7
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Abstract
Proteasome-mediated proteolysis provides dynamic spatial and temporal modulation of protein concentration in response to various intrinsic and extrinsic challenges. To gain a better understanding of the role of the proteasome in DNA repair, we systematically monitored the stability of 26 proteins involved in nucleotide excision repair (NER) under normal growth conditions. Among six NER factors found to be regulated by the proteasome, we further delineated the specific pathway involved in the degradation of Rad25, a subunit of TFIIH. We demonstrate that Rad25 turnover requires the ubiquitin-conjugating enzyme Ubc4 and the ubiquitin ligase Ufd4. Interestingly, the deletion of UFD4 specifically suppresses the rad25 mutant defective in transcription. Our results reveal a novel function of the Ufd4 pathway and another tie between the proteasome and NER regulators.
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Affiliation(s)
- Xin Bao
- From the Department of Molecular Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229 and
| | - Jill L Johnson
- the Department of Biological Sciences, University of Idaho, Moscow, Idaho 83844
| | - Hai Rao
- From the Department of Molecular Medicine, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229 and
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8
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Nakajima T, Kitagawa K, Ohhata T, Sakai S, Uchida C, Shibata K, Minegishi N, Yumimoto K, Nakayama KI, Masumoto K, Katou F, Niida H, Kitagawa M. Regulation of GATA-binding protein 2 levels via ubiquitin-dependent degradation by Fbw7: involvement of cyclin B-cyclin-dependent kinase 1-mediated phosphorylation of THR176 in GATA-binding protein 2. J Biol Chem 2015; 290:10368-81. [PMID: 25670854 DOI: 10.1074/jbc.m114.613018] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [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: 09/18/2014] [Indexed: 11/06/2022] Open
Abstract
A GATA family transcription factor, GATA-binding protein 2 (GATA2), participates in cell growth and differentiation of various cells, such as hematopoietic stem cells. Although its expression level is controlled by transcriptional induction and proteolytic degradation, the responsible E3 ligase has not been identified. Here, we demonstrate that F-box/WD repeat-containing protein 7 (Fbw7/Fbxw7), a component of Skp1, Cullin 1, F-box-containing complex (SCF)-type E3 ligase, is an E3 ligase for GATA2. GATA2 contains a cell division control protein 4 (Cdc4) phosphodegron (CPD), a consensus motif for ubiquitylation by Fbw7, which includes Thr(176). Ectopic expression of Fbw7 destabilized GATA2 and promoted its proteasomal degradation. Substitution of threonine 176 to alanine in GATA2 inhibited binding with Fbw7, and the ubiquitylation and degradation of GATA2 by Fbw7 was suppressed. The CPD kinase, which mediates the phosphorylation of Thr(176), was cyclin B-cyclin-dependent kinase 1 (CDK1). Moreover, depletion of endogenous Fbw7 stabilized endogenous GATA2 in K562 cells. Conditional Fbw7 depletion in mice increased GATA2 levels in hematopoietic stem cells and myeloid progenitors at the early stage. Increased GATA2 levels in Fbw7-conditional knock-out mice were correlated with a decrease in a c-Kit high expressing population of myeloid progenitor cells. Our results suggest that Fbw7 is a bona fide E3 ubiquitin ligase for GATA2 in vivo.
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Affiliation(s)
- Tomomi Nakajima
- From the Departments of Molecular Biology and Oral and Maxillofacial Surgery and
| | | | | | | | - Chiharu Uchida
- the Research Equipment Center, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Kiyoshi Shibata
- the Research Equipment Center, Hamamatsu University School of Medicine, 1-20-1 Handayama, Higashi-ku, Hamamatsu, Shizuoka 431-3192, Japan
| | - Naoko Minegishi
- the Department of Biobank Life Science, Tohoku University School of Medicine, 2-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8573, Japan, and
| | - Kanae Yumimoto
- the Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Keiichi I Nakayama
- the Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
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9
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Aguileta MA, Korac J, Durcan TM, Trempe JF, Haber M, Gehring K, Elsasser S, Waidmann O, Fon EA, Husnjak K. The E3 ubiquitin ligase parkin is recruited to the 26 S proteasome via the proteasomal ubiquitin receptor Rpn13. J Biol Chem 2015; 290:7492-505. [PMID: 25666615 DOI: 10.1074/jbc.m114.614925] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [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: 12/18/2022] Open
Abstract
Mutations in the Park2 gene, encoding the RING-HECT hybrid E3 ubiquitin ligase parkin, are responsible for a common familial form of Parkinson disease. By mono- and polyubiquitinating target proteins, parkin regulates various cellular processes, including degradation of proteins within the 26 S proteasome, a large multimeric degradation machine. In our attempt to further elucidate the function of parkin, we have identified the proteasomal ubiquitin receptor Rpn13/ADRM1 as a parkin-interacting protein. We show that the N-terminal ubiquitin-like (Ubl) domain of parkin binds directly to the pleckstrin-like receptor for ubiquitin (Pru) domain within Rpn13. Using mutational analysis and NMR, we find that Pru binding involves the hydrophobic patch surrounding Ile-44 in the parkin Ubl, a region that is highly conserved between ubiquitin and Ubl domains. However, compared with ubiquitin, the parkin Ubl exhibits greater than 10-fold higher affinity for the Pru domain. Moreover, knockdown of Rpn13 in cells increases parkin levels and abrogates parkin recruitment to the 26 S proteasome, establishing Rpn13 as the major proteasomal receptor for parkin. In contrast, silencing Rpn13 did not impair parkin recruitment to mitochondria or parkin-mediated mitophagy upon carbonyl cyanide m-chlorophenyl hydrazone-induced mitochondrial depolarization. However, it did delay the clearance of mitochondrial proteins (TIM23, TIM44, and TOM20) and enhance parkin autoubiquitination. Taken together, these findings implicate Rpn13 in linking parkin to the 26 S proteasome and regulating the clearance of mitochondrial proteins during mitophagy.
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Affiliation(s)
- Miguel A Aguileta
- From the McGill Parkinson Program and Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec H3A 2B4, Canada
| | - Jelena Korac
- the School of Medicine, University of Split, 21000 Split, Croatia
| | - Thomas M Durcan
- From the McGill Parkinson Program and Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec H3A 2B4, Canada
| | - Jean-François Trempe
- the Department of Biochemistry, McGill University, Montreal, Quebec H3G 0B1, Canada
| | - Michael Haber
- From the McGill Parkinson Program and Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec H3A 2B4, Canada
| | - Kalle Gehring
- the Department of Biochemistry, McGill University, Montreal, Quebec H3G 0B1, Canada
| | - Suzanne Elsasser
- the Department of Cell Biology, Harvard Medical School, Boston, Massachusetts 02115, and
| | - Oliver Waidmann
- Goethe University Medical School, D-60590 Frankfurt am Main, Germany
| | - Edward A Fon
- From the McGill Parkinson Program and Department of Neurology and Neurosurgery, Montreal Neurological Institute, McGill University, Montreal, Quebec H3A 2B4, Canada
| | - Koraljka Husnjak
- Goethe University Medical School, D-60590 Frankfurt am Main, Germany
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10
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Kommaddi RP, Jean-Charles PY, Shenoy SK. Phosphorylation of the deubiquitinase USP20 by protein kinase A regulates post-endocytic trafficking of β2 adrenergic receptors to autophagosomes during physiological stress. J Biol Chem 2015; 290:8888-903. [PMID: 25666616 DOI: 10.1074/jbc.m114.630541] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [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: 12/04/2014] [Indexed: 01/08/2023] Open
Abstract
Ubiquitination by the E3 ligase Nedd4 and deubiquitination by the deubiquitinases USP20 and USP33 have been shown to regulate the lysosomal trafficking and recycling of agonist-activated β2 adrenergic receptors (β2ARs). In this work, we demonstrate that, in cells subjected to physiological stress by nutrient starvation, agonist-activated ubiquitinated β2ARs traffic to autophagosomes to colocalize with the autophagy marker protein LC3-II. Furthermore, this trafficking is synchronized by dynamic posttranslational modifications of USP20 that, in turn, are induced in a β2AR-dependent manner. Upon β2AR activation, a specific isoform of the second messenger cAMP-dependent protein kinase A (PKAα) rapidly phosphorylates USP20 on serine 333 located in its unique insertion domain. This phosphorylation of USP20 correlates with a characteristic SDS-PAGE mobility shift of the protein, blocks its deubiquitinase activity, promotes its dissociation from the activated β2AR complex, and facilitates trafficking of the ubiquitinated β2AR to autophagosomes, which fuse with lysosomes to form autolysosomes where receptors are degraded. Dephosphorylation of USP20 has reciprocal effects and blocks trafficking of the β2AR to autophagosomes while promoting plasma membrane recycling of internalized β2ARs. Our findings reveal a dynamic regulation of USP20 by site-specific phosphorylation as well as the interdependence of signal transduction and trafficking pathways in balancing adrenergic stimulation and maintaining cellular homeostasis.
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Affiliation(s)
| | | | - Sudha K Shenoy
- From the Departments of Medicine and Cell Biology, Duke University, Medical Center, Durham, North Carolina 27710
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11
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Lee SA, Kim SM, Suh BK, Sun HY, Park YU, Hong JH, Park C, Nguyen MD, Nagata KI, Yoo JY, Park SK. Disrupted-in-schizophrenia 1 (DISC1) regulates dysbindin function by enhancing its stability. J Biol Chem 2015; 290:7087-96. [PMID: 25635053 DOI: 10.1074/jbc.m114.614750] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [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: 01/09/2023] Open
Abstract
Dysbindin and DISC1 are schizophrenia susceptibility factors playing roles in neuronal development. Here we show that the physical interaction between dysbindin and DISC1 is critical for the stability of dysbindin and for the process of neurite outgrowth. We found that DISC1 forms a complex with dysbindin and increases its stability in association with a reduction in ubiquitylation. Furthermore, knockdown of DISC1 or expression of a deletion mutant, DISC1 lacking amino acid residues 403-504 of DISC1 (DISC1(Δ403-504)), effectively decreased levels of endogenous dysbindin. Finally, the neurite outgrowth defect induced by knockdown of DISC1 was partially reversed by coexpression of dysbindin. Taken together, these results indicate that dysbindin and DISC1 form a physiologically functional complex that is essential for normal neurite outgrowth.
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Affiliation(s)
- Seol-Ae Lee
- From the Department of Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
| | - Seong-Mo Kim
- From the Department of Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
| | - Bo Kyoung Suh
- From the Department of Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
| | - Hwa-Young Sun
- From the Department of Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
| | - Young-Un Park
- From the Department of Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
| | - Ji-Ho Hong
- From the Department of Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
| | - Cana Park
- From the Department of Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
| | - Minh Dang Nguyen
- the Hotchkiss Brain Institute, Departments of Clinical Neurosciences, Cell Biology and Anatomy, and Biochemistry and Molecular Biology, University of Calgary, Calgary T2N 4N1, Canada, and
| | - Koh-Ichi Nagata
- the Department of Molecular Neurobiology, Institute for Developmental Research, Aichi Human Service Center, 713-8 Kamiya, Kasugai 480-0392, Japan
| | - Joo-Yeon Yoo
- From the Department of Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea
| | - Sang Ki Park
- From the Department of Life Sciences, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea,
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12
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Jung SA, Park YM, Hong SW, Moon JH, Shin JS, Lee HR, Ha SH, Lee DH, Kim JH, Kim SM, Kim JE, Kim KP, Hong YS, Choi EK, Lee JS, Jin DH, Kim T. Cellular inhibitor of apoptosis protein 1 (cIAP1) stability contributes to YM155 resistance in human gastric cancer cells. J Biol Chem 2015; 290:9974-85. [PMID: 25635055 DOI: 10.1074/jbc.m114.600874] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [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: 07/30/2014] [Indexed: 01/02/2023] Open
Abstract
YM155, which blocks the expression of survivin, a member of the inhibitor of apoptosis (IAP) family, induces cell death in a variety of cancer types, including prostate, bladder, breast, leukemia, and non-small lung cancer. However, the mechanism underlying gastric cancer susceptibility and resistance to YM155 is yet to be specified. Here, we demonstrate that cIAP1 stability dictates resistance to YM155 in human gastric cancer cells. Treatment of human gastric cancer cells with YM155 differentially induced cell death dependent on the stability of cIAP1 as well as survivin. Transfection with cIAP1 expression plasmids decreased cell sensitivity to YM155, whereas knockdown of endogenous cIAP1 using RNA interference enhanced sensitivity to YM155. In addition, double knockdown of survivin and cIAP1 significantly induced cell death in the YM155-resistant cell line, MKN45. We also showed that YM155 induced autoubiquitination and proteasome-dependent degradation of cIAP1. Surprisingly, survivin affected the stability of cIAP1 through binding, contributing to cell sensitivity to YM155. Thus, our findings reveal that YM155 sensitizes human gastric cancer cells to apoptotic cell death by degrading cIAP1, and furthermore, cIAP1 in gastric cancer cells may act as a PD marker for YM155 treatment.
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Affiliation(s)
- Soo-A Jung
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology
| | - Yong-Man Park
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology
| | - Seung-Woo Hong
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology
| | - Jai-Hee Moon
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology
| | - Jae-Sik Shin
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology
| | - Ha-Reum Lee
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology, the Department of Life Sciences, Sookmyung Women's University, Seoul, Republic of Korea
| | - Seung-Hee Ha
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology
| | - Dae-Hee Lee
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology
| | - Jeong Hee Kim
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology
| | - Seung-Mi Kim
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology
| | - Jeong Eun Kim
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology
| | - Kyu-pyo Kim
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology
| | - Yong Sang Hong
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology
| | - Eun Kyung Choi
- From the Innovative Cancer Research, Asan Institute for Life Science, Radiation Oncology, and
| | - Jung Shin Lee
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology
| | - Dong-Hoon Jin
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology, Convergence Medicine, University of Ulsan College of Medicine, Asan Medical Center, 88 Olympicro-43gil, Songpa-gu, Seoul and
| | - TaeWon Kim
- From the Innovative Cancer Research, Asan Institute for Life Science, Departments of Oncology,
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13
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Dong B, Li H, Singh AB, Cao A, Liu J. Inhibition of PCSK9 transcription by berberine involves down-regulation of hepatic HNF1α protein expression through the ubiquitin-proteasome degradation pathway. J Biol Chem 2014; 290:4047-58. [PMID: 25540198 DOI: 10.1074/jbc.m114.597229] [Citation(s) in RCA: 104] [Impact Index Per Article: 10.4] [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: 11/06/2022] Open
Abstract
Our previous in vitro studies have identified hepatocyte nuclear factor 1α (HNF1α) as an obligated trans-activator for PCSK9 gene expression and demonstrated its functional involvement in the suppression of PCSK9 expression by berberine (BBR), a natural cholesterol-lowering compound. In this study, we investigated the mechanism underlying the inhibitory effect of BBR on HNF1α-mediated PCSK9 transcription. Administration of BBR to hyperlipidemic mice and hamsters lowered circulating PCSK9 concentrations and hepatic PCSK9 mRNA levels without affecting the gene expression of HNF1α. However, hepatic HNF1α protein levels were markedly reduced in BBR-treated animals as compared with the control. Using HepG2 cells as a model system, we obtained evidence that BBR treatment let to accelerated degradation of HNF1α protein. By applying inhibitors to selectively block the ubiquitin proteasome system (UPS) and autophagy-lysosomal pathway, we show that HNF1α protein content in HepG2 cells was not affected by bafilomycin A1 treatment, but it was dose-dependently increased by UPS inhibitors bortezomib and MG132. Bortezomib treatment elevated HNF1α and PCSK9 cellular levels with concomitant reductions of LDL receptor protein. Moreover, HNF1α protein displayed a multiubiquitination ladder pattern in cells treated with BBR or overexpressing ubiquitin. By expressing GFP-HNF1α fusion protein in cells, we observed that blocking UPS resulted in accumulation of GFP-HNF1α in cytoplasm. Importantly, we show that the BBR reducing effects on HNF1α protein and PCSK9 gene transcription can be eradicated by proteasome inhibitors. Altogether, our studies using BBR as a probe uncovered a new aspect of PCSK9 regulation by ubiquitin-induced proteasomal degradation of HNF1α.
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Affiliation(s)
- Bin Dong
- From the Department of Veterans Affairs Palo Alto Health Care System, Palo Alto, California 94304
| | - Hai Li
- From the Department of Veterans Affairs Palo Alto Health Care System, Palo Alto, California 94304
| | - Amar Bahadur Singh
- From the Department of Veterans Affairs Palo Alto Health Care System, Palo Alto, California 94304
| | - Aiqin Cao
- From the Department of Veterans Affairs Palo Alto Health Care System, Palo Alto, California 94304
| | - Jingwen Liu
- From the Department of Veterans Affairs Palo Alto Health Care System, Palo Alto, California 94304
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14
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Abstract
Hsp60, an essential oligomeric molecular mitochondrial chaperone, has been subject to rigorous basic and clinical research. With yeast as a model system, we provide evidence for the ability of cytosolic yHsp60 to inhibit the yeast proteasome. (i) Following biological turnover of murine Bax (a proteasome substrate), we show that co-expression of cytosolic yHsp60 stabilizes Bax, enhances its association with mitochondria, and enhances its killing capacity. (ii) Expression of yHsp60 in the yeast cytosol (yHsp60c) inhibits degradation of a cytosolic protein ΔMTS-Aco1 tagged with the degron SL17 (a ubiquitin-proteasome substrate). (iii) Conditions under which Hsp60 accumulates in the cytosol (elevated Hsp60c or growth at 37 °C) correlate with reduced 20 S peptidase activity in proteasomes purified from cell extracts. (iv) Elevated yHsp60 in the cytosol correlate with accumulation of polyubiquitinated proteins. (v) According to 20 S proteasome pulldown experiments, Hsp60 is physically associated with proteasomes in extracts of cells expressing Hsp60c or grown at 37 °C. Even mutant Hsp60 proteins, lacking chaperone activity, were still capable of proteasome inhibition. The results support the hypothesis that localization of Hsp60 to the cytosol may modulate proteasome activity according to cell need.
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Affiliation(s)
- Bella Kalderon
- From the Department of Microbiology Molecular Genetics, IMRIC, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem 91120, Israel and
| | - Gleb Kogan
- From the Department of Microbiology Molecular Genetics, IMRIC, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem 91120, Israel and
| | - Ettel Bubis
- From the Department of Microbiology Molecular Genetics, IMRIC, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem 91120, Israel and
| | - Ophry Pines
- From the Department of Microbiology Molecular Genetics, IMRIC, Faculty of Medicine, Hebrew University of Jerusalem, Jerusalem 91120, Israel and the CREATE-NUS-HUJ Program, National University of Singapore, 138602 Singapore
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15
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Diaz-Martinez LA, Tian W, Li B, Warrington R, Jia L, Brautigam CA, Luo X, Yu H. The Cdc20-binding Phe box of the spindle checkpoint protein BubR1 maintains the mitotic checkpoint complex during mitosis. J Biol Chem 2014; 290:2431-43. [PMID: 25505175 DOI: 10.1074/jbc.m114.616490] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [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: 11/06/2022] Open
Abstract
The spindle checkpoint ensures accurate chromosome segregation by monitoring kinetochore-microtubule attachment. Unattached or tensionless kinetochores activate the checkpoint and enhance the production of the mitotic checkpoint complex (MCC) consisting of BubR1, Bub3, Mad2, and Cdc20. MCC is a critical checkpoint inhibitor of the anaphase-promoting complex/cyclosome, a ubiquitin ligase required for anaphase onset. The N-terminal region of BubR1 binds to both Cdc20 and Mad2, thus nucleating MCC formation. The middle region of human BubR1 (BubR1M) also interacts with Cdc20, but the nature and function of this interaction are not understood. Here we identify two critical motifs within BubR1M that contribute to Cdc20 binding and anaphase-promoting complex/cyclosome inhibition: a destruction box (D box) and a phenylalanine-containing motif termed the Phe box. A BubR1 mutant lacking these motifs is defective in MCC maintenance in mitotic human cells but is capable of supporting spindle-checkpoint function. Thus, the BubR1M-Cdc20 interaction indirectly contributes to MCC homeostasis. Its apparent dispensability in the spindle checkpoint might be due to functional duality or redundant, competing mechanisms.
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Affiliation(s)
| | - Wei Tian
- From the Department of Pharmacology
| | - Bing Li
- From the Department of Pharmacology, Howard Hughes Medical Institute, Department of Pharmacology, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390
| | - Ross Warrington
- From the Department of Pharmacology, Howard Hughes Medical Institute, Department of Pharmacology, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390
| | | | | | | | - Hongtao Yu
- From the Department of Pharmacology, Howard Hughes Medical Institute, Department of Pharmacology, University of Texas Southwestern Medical Center at Dallas, Dallas, Texas 75390
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16
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Arribas-González E, de Juan-Sanz J, Aragón C, López-Corcuera B. Molecular basis of the dominant negative effect of a glycine transporter 2 mutation associated with hyperekplexia. J Biol Chem 2014; 290:2150-65. [PMID: 25480793 DOI: 10.1074/jbc.m114.587055] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [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: 11/06/2022] Open
Abstract
Hyperekplexia or startle disease is a rare clinical syndrome characterized by an exaggerated startle in response to trivial tactile or acoustic stimuli. This neurological disorder can have serious consequences in neonates, provoking brain damage and/or sudden death due to apnea episodes and cardiorespiratory failure. Hyperekplexia is caused by defective inhibitory glycinergic neurotransmission. Mutations in the human SLC6A5 gene encoding the neuronal GlyT2 glycine transporter are responsible for the presynaptic form of the disease. GlyT2 mediates synaptic glycine recycling, which constitutes the main source of releasable transmitter at glycinergic synapses. Although the majority of GlyT2 mutations detected so far are recessive, a dominant negative mutant that affects GlyT2 trafficking does exist. In this study, we explore the properties and structural alterations of the S512R mutation in GlyT2. We analyze its dominant negative effect that retains wild-type GlyT2 in the endoplasmic reticulum (ER), preventing surface expression. We show that the presence of an arginine rather than serine 512 provoked transporter misfolding, enhanced association to the ER-chaperone calnexin, altered association with the coat-protein complex II component Sec24D, and thereby impeded ER exit. The S512R mutant formed oligomers with wild-type GlyT2 causing its retention in the ER. Overexpression of calnexin rescued wild-type GlyT2 from the dominant negative effect of the mutant, increasing the amount of transporter that reached the plasma membrane and dampening the interaction between the wild-type and mutant GlyT2. The ability of chemical chaperones to overcome the dominant negative effect of the disease mutation on the wild-type transporter was demonstrated in heterologous cells and primary neurons.
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Affiliation(s)
- Esther Arribas-González
- From the Departamento de Biología Molecular and Centro de Biología Molecular "Severo Ochoa," Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, Madrid 28049, Spain, the IdiPAZ-Hospital Universitario La Paz, Universidad Autónoma de Madrid, Madrid 28046, Spain
| | - Jaime de Juan-Sanz
- From the Departamento de Biología Molecular and Centro de Biología Molecular "Severo Ochoa," Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, Madrid 28049, Spain, the IdiPAZ-Hospital Universitario La Paz, Universidad Autónoma de Madrid, Madrid 28046, Spain the Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid 28029, Spain, and
| | - Carmen Aragón
- From the Departamento de Biología Molecular and Centro de Biología Molecular "Severo Ochoa," Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, Madrid 28049, Spain, the IdiPAZ-Hospital Universitario La Paz, Universidad Autónoma de Madrid, Madrid 28046, Spain the Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid 28029, Spain, and
| | - Beatriz López-Corcuera
- From the Departamento de Biología Molecular and Centro de Biología Molecular "Severo Ochoa," Consejo Superior de Investigaciones Científicas-Universidad Autónoma de Madrid, Madrid 28049, Spain, the IdiPAZ-Hospital Universitario La Paz, Universidad Autónoma de Madrid, Madrid 28046, Spain the Centro de Investigación Biomédica en Red de Enfermedades Raras, Instituto de Salud Carlos III, Madrid 28029, Spain, and
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17
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Abstract
β-Arrestin 2 as an adaptor plays a role in the regulation of receptor desensitization, trafficking, and signaling. Bovine β-arrestin 2 has been shown to be SUMOylated on the lysine 400 residue, which links it to the endocytosis of the β2-adrenergic receptor. Here we identify a major SUMOylation site, lysine 295, on human β-arrestin 2. SUMOylation on this site attenuates β-arrestin 2 binding to TRAF6, then enhances TRAF6 oligomerization and autoubiquitination, and consequently leads to the increase of TRAF6-mediated NF-κB/AP-1 activation. We further determine SENP1 as a specific de-SUMOylation protease that can reverse the SUMOylation of β-arrestin 2-mediated processes. Our study reveals SUMOylation as a novel mechanism in the regulation of β-arrestin 2-mediated IL-1R/TRAF6 signaling.
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Affiliation(s)
- Ning Xiao
- From the Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, State Key Laboratory of Oncogenes and Related Genes in Shanghai Cancer Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China and
| | - Hui Li
- the Key Laboratory of Pediatric Hematology and Oncology, Ministry of Health, Pediatric Translational Medicine Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200127, China
| | - Wenhan Mei
- From the Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment and Inflammation,
| | - Jinke Cheng
- From the Department of Biochemistry and Molecular Cell Biology, Shanghai Key Laboratory for Tumor Microenvironment and Inflammation, State Key Laboratory of Oncogenes and Related Genes in Shanghai Cancer Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China and
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18
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Sandoval D, Hill S, Ziemba A, Lewis S, Kuhlman B, Kleiger G. Ubiquitin-conjugating enzyme Cdc34 and ubiquitin ligase Skp1-cullin-F-box ligase (SCF) interact through multiple conformations. J Biol Chem 2014; 290:1106-18. [PMID: 25425648 DOI: 10.1074/jbc.m114.615559] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [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: 01/09/2023] Open
Abstract
In the ubiquitin-proteasome system, protein substrates are degraded via covalent modification by a polyubiquitin chain. The polyubiquitin chain must be assembled rapidly in cells, because a chain of at least four ubiquitins is required to signal for degradation, and chain-editing enzymes in the cell may cleave premature polyubiquitin chains before achieving this critical length. The ubiquitin-conjugating enzyme Cdc34 and ubiquitin ligase SCF are capable of building polyubiquitin chains onto protein substrates both rapidly and processively; this may be explained at least in part by the atypically fast rate of Cdc34 and SCF association. This rapid association has been attributed to electrostatic interactions between the acidic C-terminal tail of Cdc34 and a feature on SCF called the basic canyon. However, the structural aspects of the Cdc34-SCF interaction and how they permit rapid complex formation remain elusive. Here, we use protein cross-linking to demonstrate that the Cdc34-SCF interaction occurs in multiple conformations, where several residues from the Cdc34 acidic tail are capable of contacting a broad region of the SCF basic canyon. Similar patterns of cross-linking are also observed between Cdc34 and the Cul1 paralog Cul2, implicating the same mechanism for the Cdc34-SCF interaction in other members of the cullin-RING ubiquitin ligases. We discuss how these results can explain the rapid association of Cdc34 and SCF.
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Affiliation(s)
- Daniella Sandoval
- From the Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, Nevada 89154-4003 and
| | - Spencer Hill
- From the Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, Nevada 89154-4003 and
| | - Amy Ziemba
- From the Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, Nevada 89154-4003 and
| | - Steven Lewis
- the Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, North Carolina 27599-7260
| | - Brian Kuhlman
- the Department of Biochemistry and Biophysics, University of North Carolina, Chapel Hill, North Carolina 27599-7260
| | - Gary Kleiger
- From the Department of Chemistry and Biochemistry, University of Nevada, Las Vegas, Nevada 89154-4003 and
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19
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Wang L, Li X, Xiang B, Zhou M, Li X, Xiong W, Niu M, Wei P, Wang Z, Wang H, Chen P, Shen S, Peng S, Li G. NGX6a is degraded through a proteasome-dependent pathway without ubiquitination mediated by ezrin, a cytoskeleton-membrane linker. J Biol Chem 2014; 289:35731-42. [PMID: 25378401 DOI: 10.1074/jbc.m114.584771] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 01/28/2023] Open
Abstract
Our previous study demonstrated that the NGX6b gene acts as a suppressor in the invasion and migration of nasopharyngeal carcinoma (NPC). Recently, we identified the novel isoform NGX6a, which is longer than NGX6b. In this study, we first found that NGX6a was degraded in NPC cells and that this degradation was mediated by ezrin, a linker between membrane proteins and the cytoskeleton. Specific siRNAs against ezrin increase the protein level of NGX6a in these cells. During degradation, NGX6a is not ubiquitinated but is degraded through a proteasome-dependent pathway. The distribution pattern of ezrin was negatively associated with NGX6a in an immunochemistry analysis of a nasopharyngeal carcinoma tissue microarray and fetus multiple organ tissues and Western blot analysis in nasopharyngeal and NPC cell lines, suggesting that ezrin and NGX6a are associated and are involved in the progression and invasion of NPC. By mapping the interacting binding sites, the seven-transmembrane domain of NGX6a was found to be the critical region for the degradation of NGX6a, and the amino terminus of ezrin is required for the induction of NGX6a degradation. The knockdown of ezrin or transfection of the NGX6a mutant CO, which has an EGF-like domain and a transmembrane 1 domain, resulted in no degradation, significantly reducing the ability of invasion and migration of NPC cells. This study provides a novel molecular mechanism for the low expression of NGX6a in NPC cells and an important molecular event in the process of invasion and metastasis of nasopharyngeal carcinoma cells.
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Affiliation(s)
- Li Wang
- the Cancer Research Institute, Central South University, Changsha, Hunan 410078, China, the Department of Cardio-Thoracic Surgery, Second Xiangya Hospital of Central South University, 139 Renmin Middle Road, Changsha, Hunan 410012, China, and
| | - Xiaoling Li
- the Cancer Research Institute, Central South University, Changsha, Hunan 410078, China, From the Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya School of Medicine, Central South University, 582 Xianjiahu Road, Changsha, Hunan 410013, China
| | - Bo Xiang
- the Cancer Research Institute, Central South University, Changsha, Hunan 410078, China, From the Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya School of Medicine, Central South University, 582 Xianjiahu Road, Changsha, Hunan 410013, China
| | - Ming Zhou
- the Cancer Research Institute, Central South University, Changsha, Hunan 410078, China, From the Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya School of Medicine, Central South University, 582 Xianjiahu Road, Changsha, Hunan 410013, China
| | - Xiayu Li
- the Third Xiang-Ya Hospital, Central South University, Changsha, Hunan 410013, China
| | - Wei Xiong
- the Cancer Research Institute, Central South University, Changsha, Hunan 410078, China, From the Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya School of Medicine, Central South University, 582 Xianjiahu Road, Changsha, Hunan 410013, China
| | - Man Niu
- the Cancer Research Institute, Central South University, Changsha, Hunan 410078, China
| | - Pingpin Wei
- the Cancer Research Institute, Central South University, Changsha, Hunan 410078, China
| | - Zeyou Wang
- the Cancer Research Institute, Central South University, Changsha, Hunan 410078, China
| | - Heran Wang
- the Cancer Research Institute, Central South University, Changsha, Hunan 410078, China
| | - Pan Chen
- From the Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya School of Medicine, Central South University, 582 Xianjiahu Road, Changsha, Hunan 410013, China
| | - Shourong Shen
- the Third Xiang-Ya Hospital, Central South University, Changsha, Hunan 410013, China
| | - Shuping Peng
- the Cancer Research Institute, Central South University, Changsha, Hunan 410078, China, From the Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya School of Medicine, Central South University, 582 Xianjiahu Road, Changsha, Hunan 410013, China,
| | - Guiyuan Li
- the Cancer Research Institute, Central South University, Changsha, Hunan 410078, China, From the Hunan Provincial Tumor Hospital and the Affiliated Tumor Hospital of Xiangya School of Medicine, Central South University, 582 Xianjiahu Road, Changsha, Hunan 410013, China,
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20
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Ainscough JS, Frank Gerberick G, Zahedi-Nejad M, Lopez-Castejon G, Brough D, Kimber I, Dearman RJ. Dendritic cell IL-1α and IL-1β are polyubiquitinated and degraded by the proteasome. J Biol Chem 2014; 289:35582-92. [PMID: 25371210 PMCID: PMC4271241 DOI: 10.1074/jbc.m114.595686] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
IL-1α and β are key players in the innate immune system. The secretion of these cytokines by dendritic cells (DC) is integral to the development of proinflammatory responses. These cytokines are not secreted via the classical secretory pathway. Instead, 2 independent processes are required; an initial signal to induce up-regulation of the precursor pro-IL-1α and -β, and a second signal to drive cleavage and consequent secretion. Pro-IL-1α and -β are both cytosolic and thus, are potentially subject to post-translational modifications. These modifications may, in turn, have a functional outcome in the context of IL-1α and -β secretion and hence inflammation. We report here that IL-1α and -β were degraded intracellularly in murine bone marrow-derived DC and that this degradation was dependent on active cellular processes. In addition, we demonstrate that degradation was ablated when the proteasome was inhibited, whereas autophagy did not appear to play a major role. Furthermore, inhibition of the proteasome led to an accumulation of polyubiquitinated IL-1α and -β, indicating that IL-1α and -β were polyubiquitinated prior to proteasomal degradation. Finally, our investigations suggest that polyubiquitination and proteasomal degradation are not continuous processes but instead are up-regulated following DC activation. Overall, these data highlight that IL-1α and -β polyubiquitination and proteasomal degradation are central mechanisms in the regulation of intracellular IL-1 levels in DC.
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Affiliation(s)
- Joseph S Ainscough
- From the Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, United Kingdom and
| | | | - Maryam Zahedi-Nejad
- From the Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, United Kingdom and
| | - Gloria Lopez-Castejon
- From the Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, United Kingdom and
| | - David Brough
- From the Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, United Kingdom and
| | - Ian Kimber
- From the Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, United Kingdom and
| | - Rebecca J Dearman
- From the Faculty of Life Sciences, University of Manchester, Manchester M13 9PT, United Kingdom and
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21
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Lee S, Challa-Malladi M, Bratton SB, Wright CW. Nuclear factor-κB-inducing kinase (NIK) contains an amino-terminal inhibitor of apoptosis (IAP)-binding motif (IBM) that potentiates NIK degradation by cellular IAP1 (c-IAP1). J Biol Chem 2014; 289:30680-30689. [PMID: 25246529 PMCID: PMC4215246 DOI: 10.1074/jbc.m114.587808] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Revised: 09/03/2014] [Indexed: 12/20/2022] Open
Abstract
Activation of the noncanonical NF-κB pathway hinges on the stability of the NF-κB-inducing kinase (NIK), which is kept at low levels basally by a protein complex consisting of the E3 ubiquitin ligases cellular inhibitor of apoptosis 1 and 2 (c-IAP1/2) proteins and the tumor necrosis factor receptor-associated factors 2 and 3 (TRAF2/3). NIK is brought into close proximity to the c-IAPs through a TRAF2-TRAF3 bridge where TRAF2 recruits c-IAP1/2 and TRAF3 binds to NIK. However, it is not clear how the c-IAPs specifically recognize and ubiquitylate NIK in the complex. We have identified an IAP-binding motif (IBM) at the amino terminus of NIK. IBMs are utilized by a number of proapoptotic proteins to antagonize IAP function. Here, we utilize mutational studies to demonstrate that wild-type NIK is destabilized in the presence of c-IAP1, whereas the NIK IBM mutant is stable. NIK interacts with the second baculovirus IAP repeat (BIR2) domain of c-IAP1 via the IBM, and this interaction, in turn, provides substrate recognition for c-IAP1 mediated ubiquitylation and degradation of NIK. Furthermore, in the presence of the NIK IBM mutant, we observed an elevated processing of p100 to p52 followed by increased expression of NF-κB target genes. Together, these findings reveal the novel identification and function of the NIK IBM, which promotes c-IAP1-dependent ubiquitylation of NIK, resulting in optimal NIK turnover to ensure that noncanonical NF-κB signaling is off in the absence of an activating signal.
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Affiliation(s)
- Sunhee Lee
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas 78712, and
| | - Madhavi Challa-Malladi
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas 78712, and
| | - Shawn B Bratton
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas 78712, and; Department of Molecular Carcinogenesis, The University of Texas MD Anderson Cancer Center, Science Park, Smithville, Texas 78957
| | - Casey W Wright
- Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas 78712, and; Center for Molecular and Cellular Toxicology in the Division of Pharmacology and Toxicology, College of Pharmacy and The University of Texas at Austin, Austin, Texas 78712.
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22
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Abstract
RNF4 is an E3 ubiquitin ligase originally identified as a transcription co-activator. The mechanism by which RNF4 promotes transcription remains unclear. In this study, I found that RNF4 antagonizes transcriptional repression mediated by DNA methylation. RNF4 does not promote DNA demethylation, but mediates the ubiquitination of MeCP2, a methyl-CpG-binding domain (MBD) protein. Removal of MeCP2 from gene promoters activates transcription. This study thus not only uncovers how RNF4 functions as a transcription activator, but also reveals the mechanism by which MeCP2 protein stability is regulated.
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Affiliation(s)
- Yu Wang
- From the Program in Cellular and Molecular Medicine, Boston Children's Hospital, and Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115
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23
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Hanoun N, Fritsch S, Gayet O, Gigoux V, Cordelier P, Dusetti N, Torrisani J, Dufresne M. The E3 ubiquitin ligase thyroid hormone receptor-interacting protein 12 targets pancreas transcription factor 1a for proteasomal degradation. J Biol Chem 2014; 289:35593-604. [PMID: 25355311 DOI: 10.1074/jbc.m114.620104] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [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: 11/06/2022] Open
Abstract
Pancreas transcription factor 1a (PTF1a) plays a crucial role in the early development of the pancreas and in the maintenance of the acinar cell phenotype. Several transcriptional mechanisms regulating expression of PTF1a have been identified. However, regulation of PTF1a protein stability and degradation is still unexplored. Here, we report that inhibition of proteasome leads to elevated levels of PTF1a and to the existence of polyubiquitinated forms of PTF1a. We used the Sos recruitment system, an alternative two-hybrid system method to detect protein-protein interactions in the cytoplasm and to map the interactome of PTF1a. We identified TRIP12 (thyroid hormone receptor-interacting protein 12), an E3 ubiquitin-protein ligase as a new partner of PTF1a. We confirmed PTF1a/TRIP12 interaction in acinar cell lines and in co-transfected HEK-293T cells. The protein stability of PTF1a is significantly increased upon decreased expression of TRIP12. It is reduced upon overexpression of TRIP12 but not a catalytically inactive TRIP12-C1959A mutant. We identified a region of TRIP12 required for interaction and identified lysine 312 of PTF1a as essential for proteasomal degradation. We also demonstrate that TRIP12 down-regulates PTF1a transcriptional and antiproliferative activities. Our data suggest that an increase in TRIP12 expression can play a part in PTF1a down-regulation and indicate that PTF1a/TRIP12 functional interaction may regulate pancreatic epithelial cell homeostasis.
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Affiliation(s)
- Naïma Hanoun
- From the INSERM UMR1037, Cancer Research Center of Toulouse (CRCT), University of Toulouse III Paul Sabatier, 31037 Toulouse, France
| | - Samuel Fritsch
- From the INSERM UMR1037, Cancer Research Center of Toulouse (CRCT), University of Toulouse III Paul Sabatier, 31037 Toulouse, France
| | - Odile Gayet
- the Cancer Research Center of Marseille, INSERM UMR1068, Paoli-Calmettes Institute, University of Aix-Marseille, CNRS UMR7258, 13273 Marseille, France
| | - Véronique Gigoux
- EA 4552, University of Toulouse III Paul Sabatier, 31432 Toulouse, France, and
| | - Pierre Cordelier
- From the INSERM UMR1037, Cancer Research Center of Toulouse (CRCT), University of Toulouse III Paul Sabatier, 31037 Toulouse, France
| | - Nelson Dusetti
- the Cancer Research Center of Marseille, INSERM UMR1068, Paoli-Calmettes Institute, University of Aix-Marseille, CNRS UMR7258, 13273 Marseille, France
| | - Jérôme Torrisani
- From the INSERM UMR1037, Cancer Research Center of Toulouse (CRCT), University of Toulouse III Paul Sabatier, 31037 Toulouse, France
| | - Marlène Dufresne
- From the INSERM UMR1037, Cancer Research Center of Toulouse (CRCT), University of Toulouse III Paul Sabatier, 31037 Toulouse, France,
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24
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Dikopoltsev E, Foltyn VN, Zehl M, Jensen ON, Mori H, Radzishevsky I, Wolosker H. FBXO22 protein is required for optimal synthesis of the N-methyl-D-aspartate (NMDA) receptor coagonist D-serine. J Biol Chem 2014; 289:33904-15. [PMID: 25336657 DOI: 10.1074/jbc.m114.618405] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [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: 12/13/2022] Open
Abstract
d-Serine is a physiological activator of NMDA receptors (NMDARs) in the nervous system that mediates several NMDAR-mediated processes ranging from normal neurotransmission to neurodegeneration. d-Serine is synthesized from l-serine by serine racemase (SR), a brain-enriched enzyme. However, little is known about the regulation of d-serine synthesis. We now demonstrate that the F-box only protein 22 (FBXO22) interacts with SR and is required for optimal d-serine synthesis in cells. Although FBXO22 is classically associated with the ubiquitin system and is recruited to the Skip1-Cul1-F-box E3 complex, SR interacts preferentially with free FBXO22 species. In vivo ubiquitination and SR half-life determination indicate that FBXO22 does not target SR to the proteasome system. FBXO22 primarily affects SR subcellular localization and seems to increase d-serine synthesis by preventing the association of SR to intracellular membranes. Our data highlight an atypical role of FBXO22 in enhancing d-serine synthesis that is unrelated to its classical effects as a component of the ubiquitin-proteasome degradation pathway.
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Affiliation(s)
- Elena Dikopoltsev
- From the Department of Biochemistry, Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 31096, Israel
| | - Veronika N Foltyn
- From the Department of Biochemistry, Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 31096, Israel
| | - Martin Zehl
- the Department of Pharmacognosy, University of Vienna, 1090 Vienna, Austria
| | - Ole N Jensen
- the Department of Biochemistry and Molecular Biology, University of Southern Denmark, 5230 Odense M, Denmark, and
| | - Hisashi Mori
- the Department of Molecular Neuroscience, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama 930-0194, Japan
| | - Inna Radzishevsky
- From the Department of Biochemistry, Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 31096, Israel
| | - Herman Wolosker
- From the Department of Biochemistry, Rappaport Faculty of Medicine and Research Institute, Technion-Israel Institute of Technology, Haifa 31096, Israel,
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25
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Crowell S, Wancket LM, Shakibi Y, Xu P, Xue J, Samavati L, Nelin LD, Liu Y. Post-translational regulation of mitogen-activated protein kinase phosphatase (MKP)-1 and MKP-2 in macrophages following lipopolysaccharide stimulation: the role of the C termini of the phosphatases in determining their stability. J Biol Chem 2014; 289:28753-64. [PMID: 25204653 PMCID: PMC4200237 DOI: 10.1074/jbc.m114.591925] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 09/05/2014] [Indexed: 01/19/2023] Open
Abstract
MAPK phosphatases (MKPs) are critical modulators of the innate immune response, and yet the mechanisms regulating their accumulation remain poorly understood. In the present studies, we investigated the role of post-translational modification in the accumulation of MKP-1 and MKP-2 in macrophages following LPS stimulation. We found that upon LPS stimulation, MKP-1 and MKP-2 accumulated with different kinetics: MKP-1 level peaked at ∼1 h, while MKP-2 levels continued to rise for at least 6 h. Accumulation of both MKP-1 and MKP-2 were attenuated by inhibition of the ERK cascade. Interestingly, p38 inhibition prior to LPS stimulation had little effect on MKP-1 and MKP-2 protein levels, but hindered their detection by an M-18 MKP-1 antibody. Studies of the epitope sequence recognized by the M-18 MKP-1 antibody revealed extensive phosphorylation of two serine residues in the C terminus of both MKP-1 and MKP-2 by the ERK pathway. Remarkably, the stability of both MKP-1 and MKP-2 was markedly decreased in macrophages in the presence of an ERK pathway inhibitor. Mutation of the two C-terminal serine residues in MKP-1 and MKP-2 to alanine decreased their half-lives, while mutating these residues to aspartate dramatically increased their half-lives. Deletion of the C terminus from MKP-1 and MKP-2 also considerably increased their stabilities. Surprisingly, enhanced stabilities of the MKP-1 and MKP-2 mutants were not associated with decreased ubiquitination. Degradation of both MKP-1 and MKP-2 was attenuated by proteasomal inhibitors. Our studies suggest that MKP-1 and MKP-2 stability is regulated by ERK-mediated phosphorylation through a degradation pathway independent of polyubiquitination.
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Affiliation(s)
- Sara Crowell
- From the Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio 43205
| | - Lyn M Wancket
- Department of Veterinary Bioscience, The Ohio State University College of Veterinary Medicine, Columbus, Ohio 43210, and
| | - Yasmine Shakibi
- From the Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio 43205
| | - Pingping Xu
- From the Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio 43205
| | - Jianjing Xue
- From the Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio 43205
| | - Lobelia Samavati
- Department of Medicine, Division of Pulmonary, Critical Care and Sleep Medicine, Wayne State University School of Medicine and Detroit Medical Center, Detroit, Michigan 48201
| | - Leif D Nelin
- From the Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio 43205, Department of Pediatrics, The Ohio State University College of Medicine, Columbus, Ohio 43205
| | - Yusen Liu
- From the Center for Perinatal Research, The Research Institute at Nationwide Children's Hospital, Columbus, Ohio 43205, Department of Veterinary Bioscience, The Ohio State University College of Veterinary Medicine, Columbus, Ohio 43210, and Department of Pediatrics, The Ohio State University College of Medicine, Columbus, Ohio 43205,
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26
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Abstract
Histone ubiquitination at DNA double strand breaks facilitates the recruitment of downstream repair proteins; however, how the ubiquitination is dynamically regulated during repair and terminated after repair is not well understood. Here we report that the histone H2A deubiquitinase USP16 interacts with HERC2, fine-tunes the ubiquitin signal during repair, and importantly, is required for terminating the ubiquitination signal after repair. HERC2 interacts with the coiled-coil domain of USP16 through its C-terminal HECT domain. HERC2 knockdown affects the levels of ubiquitinated H2A through the action of USP16. In response to DNA damage, USP16 levels increase, and this increase is dependent on HERC2. Increased USP16 serves as a negative regulator for DNA damage-induced ubiquitin foci formation and affects downstream factor recruitment and DNA damage response. The functional significance of USP16 is further manifested in human Down syndrome patient cells, which contain three copies of USP16 genes and have altered cellular response to DNA damage. Finally, we demonstrated that USP16 could deubiquitinate both H2A Lys-119 and H2A Lys-15 ubiquitination in vitro. Therefore, this study identifies USP16 as a critical regulator of DNA damage response and H2A Lys-15 ubiquitination as a potential target of USP16.
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Affiliation(s)
- Zhuo Zhang
- From the Department of Biochemistry and Molecular Genetics, Stem Cell Institute, University of Alabama at Birmingham, Birmingham, Alabama 35294 and
| | - Huirong Yang
- From the Department of Biochemistry and Molecular Genetics, Stem Cell Institute, University of Alabama at Birmingham, Birmingham, Alabama 35294 and Institutes of Biomedical Sciences, Fudan University, Shanghai 200433, China
| | - Hengbin Wang
- From the Department of Biochemistry and Molecular Genetics, Stem Cell Institute, University of Alabama at Birmingham, Birmingham, Alabama 35294 and
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27
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Abstract
The key member of the MOZ (monocyticleukaemia zinc finger protein), Ybf2/Sas3, Sas2, and TIP60 acetyltransferases family, Tat-interactive protein, 60 kD (TIP60), tightly modulates a wide array of cellular processes, including chromatin remodeling, gene transcription, apoptosis, DNA repair, and cell cycle arrest. The function of TIP60 can be regulated by SIRT1 through deacetylation. Here we found that TIP60 can also be functionally regulated by HDAC3. We identified six lysine residues as its autoacetylation sites. Mutagenesis of these lysines to arginines completely abolishes the autoacetylation of TIP60. Overexpression of HDAC3 increases TIP60 ubiquitination levels. However, unlike SIRT1, HDAC3 increased the half-life of TIP60. Further study found that HDAC3 colocalized with TIP60 both in the nucleus and the cytoplasm, which could be the reason why HDAC3 can stabilize TIP60. The deacetylation of TIP60 by both SIRT1 and HDAC3 reduces apoptosis induced by DNA damage. Knockdown of HDAC3 in cells increased TIP60 acetylation levels and increased apoptosis after DNA damage. Together, our findings provide a better understanding of TIP60 regulation mechanisms, which is a significant basis for further studies of its cellular functions.
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Affiliation(s)
- Jingjie Yi
- From the School of Life Sciences, Xiamen University, Xiamen, Fujian 361005, China, the Department of Medical and Research Technology and Department of Pathology, Program in Oncology, Marlene and Stewart Greenebaum Cancer Center, School of Medicine, University of Maryland, Baltimore, Maryland 21201
| | - Xiangyang Huang
- the Department of Medical and Research Technology and Department of Pathology, Program in Oncology, Marlene and Stewart Greenebaum Cancer Center, School of Medicine, University of Maryland, Baltimore, Maryland 21201, the Department of Rheumatology, West China Hospital, West China School of Medicine, Sichuan University, Chengdu, Sichuan 610041, China, and
| | - Yuxia Yang
- the Peking University Health Science Center, Beijing 100191, China
| | - Wei-Guo Zhu
- the Peking University Health Science Center, Beijing 100191, China
| | - Wei Gu
- the Institute for Cancer Genetics and Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, New York 10032
| | - Jianyuan Luo
- the Department of Medical and Research Technology and Department of Pathology, Program in Oncology, Marlene and Stewart Greenebaum Cancer Center, School of Medicine, University of Maryland, Baltimore, Maryland 21201, the Peking University Health Science Center, Beijing 100191, China,
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28
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Kojima K, Amano Y, Yoshino K, Tanaka N, Sugamura K, Takeshita T. ESCRT-0 protein hepatocyte growth factor-regulated tyrosine kinase substrate (Hrs) is targeted to endosomes independently of signal-transducing adaptor molecule (STAM) and the complex formation with STAM promotes its endosomal dissociation. J Biol Chem 2014; 289:33296-310. [PMID: 25296754 DOI: 10.1074/jbc.m114.578245] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [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: 11/06/2022] Open
Abstract
The ESCRT-0 complex, consisting of the hepatocyte growth factor-regulated tyrosine kinase substrate (Hrs) and the signal-transducing adaptor molecule (STAM) proteins, recognizes ubiquitylated cargo during the initial step of endosomal sorting. The endosomal accumulation of overexpressed Hrs has been reported previously to be associated with endosome enlargement. In this study, we have found that co-expressing exogenous STAM1 in Hrs-overexpressing cells leads to a diffuse localization for a large part of the Hrs accumulated on endosomes and a recovery of the impaired cargo protein degradation process, thus suggesting that exogenous STAM abrogates the abnormalities of the Hrs-positive endosomes. A fluorescently labeled Hrs, introduced into the cells by membrane permeabilization, exhibited endosomal localization in the absence of STAM1 and gradually dissociated from the endosomes upon the sequential addition of recombinant STAM1. Furthermore, when microinjected into cells, the fluorescently labeled Hrs also showed endosomal accumulation; however, ESCRT-0 complexes formed prior to the microinjection did not. Analysis of the state of the complex in HeLa cells using blue-native PAGE revealed that the membrane-associated Hrs exists partly as a monomer and not only in the STAM1-bound form. Thus, our data suggest that the membrane binding and dissociation cycle of the ESCRT-0 proteins on the endosomal membrane is a critical step during the cargo sorting process.
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Affiliation(s)
- Katsuhiko Kojima
- From the Department of Microbiology and Immunology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621 and
| | - Yuji Amano
- From the Department of Microbiology and Immunology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621 and
| | - Kazuhisa Yoshino
- From the Department of Microbiology and Immunology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621 and
| | | | - Kazuo Sugamura
- Molecular and Cellular Oncology, Miyagi Cancer Center Research Institute, 47-1 Nodayama, Medeshima-Shiode, Natori 981-1293, Japan
| | - Toshikazu Takeshita
- From the Department of Microbiology and Immunology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621 and
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29
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Parks EE, Ceresa BP. Cell surface epidermal growth factor receptors increase Src and c-Cbl activity and receptor ubiquitylation. J Biol Chem 2014; 289:25537-45. [PMID: 25074934 PMCID: PMC4162159 DOI: 10.1074/jbc.m114.579581] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Revised: 07/07/2014] [Indexed: 11/06/2022] Open
Abstract
There is an established role for the endocytic pathway in regulation of epidermal growth factor receptor (EGFR) signaling to downstream effectors. However, because ligand-mediated EGFR endocytosis utilizes multiple "moving parts," dissecting the spatial versus temporal contributions has been challenging. Blocking all endocytic trafficking can have unintended effects on other receptors as well as give rise to compensatory mechanisms, both of which impact interpretation of EGFR signaling. To overcome these limitations, we used epidermal growth factor (EGF) conjugated to polystyrene beads (EGF beads). EGF beads simultaneously activate the EGFR while blocking its endocytosis and allow analysis of EGFR signaling from the plasma membrane. Human telomerase immortalized corneal epithelial (hTCEpi) cells were used to model normal epithelial cell biology. In hTCEpi cells, both cell surface and intracellular EGFRs exhibited dose-dependent increases in effector activity after 15 min of ligand stimulation, but only the serine phosphorylation of signal transducer and activator of transcription 3 (STAT3) was statistically significant when accounting for receptor phosphorylation. However, over time with physiological levels of receptor phosphorylation, cell surface receptors produced either enhanced or sustained mitogen-activated protein kinase kinase (MEK), Casitas B-lineage lymphoma (c-Cbl), and the pro-oncogene Src activity. These increases in effector communication by cell surface receptors resulted in an increase in EGFR ubiquitylation with sustained ligand incubation. Together, these data indicate that spatial regulation of EGFR signaling may be an important regulatory mechanism in receptor down-regulation.
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Affiliation(s)
- Eileen E Parks
- From the Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky 40202
| | - Brian P Ceresa
- From the Department of Pharmacology and Toxicology, University of Louisville, Louisville, Kentucky 40202
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30
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Hsu HM, Lee Y, Hsu PH, Liu HW, Chu CH, Chou YW, Chen YR, Chen SH, Tai JH. Signal transduction triggered by iron to induce the nuclear importation of a Myb3 transcription factor in the parasitic protozoan Trichomonas vaginalis. J Biol Chem 2014; 289:29334-49. [PMID: 25183012 DOI: 10.1074/jbc.m114.599498] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Iron was previously shown to induce rapid nuclear translocation of a Myb3 transcription factor in the protozoan parasite, Trichomonas vaginalis. In the present study, iron was found to induce a transient increase in cellular cAMP, followed by the nuclear influx of Myb3, whereas the latter was also induced by 8-bromo-cyclic AMP. Iron-inducible cAMP production and nuclear influx of Myb3 were inhibited by suramin and SQ22536, respective inhibitors of the Gα subunit of heterotrimeric G proteins and adenylyl cyclases. In contrast, the nuclear influx of Myb3 induced by iron or 8-bromo-cAMP was delayed or inhibited, respectively, by H89, the inhibitor of protein kinase A. Using liquid chromatography-coupled tandem mass spectrometry, Thr(156) and Lys(143) in Myb3 were found to be phosphorylated and ubiquitinated, respectively. These modifications were induced by iron and inhibited by H89, as shown by immunoprecipitation-coupled Western blotting. Iron-inducible ubiquitination and nuclear influx were aborted in T156A and K143R, but T156D was constitutively ubiquitinated and persistently localized to the nucleus. Myb3 was phosphorylated in vitro by the catalytic subunit of a T. vaginalis protein kinase A, TvPKAc. A transient interaction between TvPKAc and Myb3 and the phosphorylation of both proteins were induced in the parasite shortly after iron or 8-bromo-cAMP treatment. Together, these observations suggest that iron may induce production of cAMP and activation of TvPKAc, which then induces the phosphorylation of Myb3 and subsequent ubiquitination for accelerated nuclear influx. It is conceivable that iron probably exerts a much broader impact on the physiology of the parasite than previously thought to encounter environmental changes.
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Affiliation(s)
- Hong-Ming Hsu
- From the Division of Infectious Diseases, Institute of Biomedical Sciences and
| | - Yu Lee
- From the Division of Infectious Diseases, Institute of Biomedical Sciences and
| | - Pang-Hung Hsu
- the Department of Bioscience and Biotechnology, National Taiwan Ocean University, Keelun 20224, Taiwan, and
| | - Hsing-Wei Liu
- From the Division of Infectious Diseases, Institute of Biomedical Sciences and
| | - Chien-Hsin Chu
- From the Division of Infectious Diseases, Institute of Biomedical Sciences and
| | - Ya-Wen Chou
- Research Center of Agriculture and Biotechnology, Academia Sinica, Taipei 11529, Taiwan
| | - Yet-Ran Chen
- Research Center of Agriculture and Biotechnology, Academia Sinica, Taipei 11529, Taiwan
| | - Shu-Hui Chen
- the Department of Chemistry, National Chen Kung University, Tainan 70101, Taiwan
| | - Jung-Hsiang Tai
- From the Division of Infectious Diseases, Institute of Biomedical Sciences and
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31
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Ali M, Chernova TA, Newnam GP, Yin L, Shanks J, Karpova TS, Lee A, Laur O, Subramanian S, Kim D, McNally JG, Seyfried NT, Chernoff YO, Wilkinson KD. Stress-dependent proteolytic processing of the actin assembly protein Lsb1 modulates a yeast prion. J Biol Chem 2014; 289:27625-39. [PMID: 25143386 DOI: 10.1074/jbc.m114.582429] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [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: 11/06/2022] Open
Abstract
Yeast prions are self-propagating amyloid-like aggregates of Q/N-rich protein that confer heritable traits and provide a model of mammalian amyloidoses. [PSI(+)] is a prion isoform of the translation termination factor Sup35. Propagation of [PSI(+)] during cell division under normal conditions and during the recovery from damaging environmental stress depends on cellular chaperones and is influenced by ubiquitin proteolysis and the actin cytoskeleton. The paralogous yeast proteins Lsb1 and Lsb2 bind the actin assembly protein Las17 (a yeast homolog of human Wiskott-Aldrich syndrome protein) and participate in the endocytic pathway. Lsb2 was shown to modulate maintenance of [PSI(+)] during and after heat shock. Here, we demonstrate that Lsb1 also regulates maintenance of the Sup35 prion during and after heat shock. These data point to the involvement of Lsb proteins in the partitioning of protein aggregates in stressed cells. Lsb1 abundance and cycling between actin patches, endoplasmic reticulum, and cytosol is regulated by the Guided Entry of Tail-anchored proteins pathway and Rsp5-dependent ubiquitination. Heat shock-induced proteolytic processing of Lsb1 is crucial for prion maintenance during stress. Our findings identify Lsb1 as another component of a tightly regulated pathway controlling protein aggregation in changing environments.
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Affiliation(s)
- Moiez Ali
- From the Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Tatiana A Chernova
- From the Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322,
| | - Gary P Newnam
- the School of Biology and Parker H. Petit Institute for Bioengineering & Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332
| | - Luming Yin
- From the Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322
| | - John Shanks
- From the Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Tatiana S Karpova
- the Center for Cancer Research Core Fluorescence Imaging Facility, Laboratory of Receptor Biology and Gene Expression, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892
| | - Andrew Lee
- From the Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Oskar Laur
- the Division of Microbiology, Yerkes Research Center, Emory University, Atlanta, Georgia 30329, and
| | - Sindhu Subramanian
- From the Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Dami Kim
- From the Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322
| | - James G McNally
- the Center for Cancer Research Core Fluorescence Imaging Facility, Laboratory of Receptor Biology and Gene Expression, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892
| | - Nicholas T Seyfried
- From the Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322
| | - Yury O Chernoff
- the School of Biology and Parker H. Petit Institute for Bioengineering & Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, the Laboratory of Amyloid Biology, St. Petersburg State University, St. Petersburg, Russia 199034
| | - Keith D Wilkinson
- From the Department of Biochemistry, Emory University School of Medicine, Atlanta, Georgia 30322,
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32
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He J, Zhu Q, Wani G, Sharma N, Han C, Qian J, Pentz K, Wang QE, Wani AA. Ubiquitin-specific protease 7 regulates nucleotide excision repair through deubiquitinating XPC protein and preventing XPC protein from undergoing ultraviolet light-induced and VCP/p97 protein-regulated proteolysis. J Biol Chem 2014; 289:27278-27289. [PMID: 25118285 DOI: 10.1074/jbc.m114.589812] [Citation(s) in RCA: 67] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Ubiquitin specific protease 7 (USP7) is a known deubiquitinating enzyme for tumor suppressor p53 and its downstream regulator, E3 ubiquitin ligase Mdm2. Here we report that USP7 regulates nucleotide excision repair (NER) via deubiquitinating xeroderma pigmentosum complementation group C (XPC) protein, a critical damage recognition factor that binds to helix-distorting DNA lesions and initiates NER. XPC is ubiquitinated during the early stage of NER of UV light-induced DNA lesions. We demonstrate that transiently compromising cellular USP7 by siRNA and chemical inhibition leads to accumulation of ubiquitinated forms of XPC, whereas complete USP7 deficiency leads to rapid ubiquitin-mediated XPC degradation upon UV irradiation. We show that USP7 physically interacts with XPC in vitro and in vivo. Overexpression of wild-type USP7, but not its catalytically inactive or interaction-defective mutants, reduces the ubiquitinated forms of XPC. Importantly, USP7 efficiently deubiquitinates XPC-ubiquitin conjugates in deubiquitination assays in vitro. We further show that valosin-containing protein (VCP)/p97 is involved in UV light-induced XPC degradation in USP7-deficient cells. VCP/p97 is readily recruited to DNA damage sites and colocalizes with XPC. Chemical inhibition of the activity of VCP/p97 ATPase causes an increase in ubiquitinated XPC on DNA-damaged chromatin. Moreover, USP7 deficiency severely impairs the repair of cyclobutane pyrimidine dimers and, to a lesser extent, affects the repair of 6-4 photoproducts. Taken together, our findings uncovered an important role of USP7 in regulating NER via deubiquitinating XPC and by preventing its VCP/p97-regulated proteolysis.
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Affiliation(s)
- Jinshan He
- Department of Radiology, The Ohio State University, Columbus, Ohio 43210
| | - Qianzheng Zhu
- Department of Radiology, The Ohio State University, Columbus, Ohio 43210.
| | - Gulzar Wani
- Department of Radiology, The Ohio State University, Columbus, Ohio 43210
| | - Nidhi Sharma
- Department of Radiology, The Ohio State University, Columbus, Ohio 43210
| | - Chunhua Han
- Department of Radiology, The Ohio State University, Columbus, Ohio 43210
| | - Jiang Qian
- Department of Radiology, The Ohio State University, Columbus, Ohio 43210
| | - Kyle Pentz
- Department of Radiology, The Ohio State University, Columbus, Ohio 43210
| | - Qi-En Wang
- Department of Radiology, The Ohio State University, Columbus, Ohio 43210
| | - Altaf A Wani
- Department of Radiology, The Ohio State University, Columbus, Ohio 43210; Department of Molecular and Cellular Biochemistry, and The Ohio State University, Columbus, Ohio 43210; James Cancer Hospital and Solove Research Institute, The Ohio State University, Columbus, Ohio 43210.
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33
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Lin A, Man HY. Endocytic adaptor epidermal growth factor receptor substrate 15 (Eps15) is involved in the trafficking of ubiquitinated α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors. J Biol Chem 2014; 289:24652-64. [PMID: 25023288 DOI: 10.1074/jbc.m114.582114] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [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: 11/06/2022] Open
Abstract
AMPA-type glutamate receptors (AMPARs) play a critical role in mediating fast excitatory synaptic transmission in the brain. Alterations in receptor expression, distribution, and trafficking have been shown to underlie synaptic plasticity and higher brain functions, including learning and memory, as well as brain dysfunctions such as drug addiction and psychological disorders. Therefore, it is essential to elucidate the molecular mechanisms that regulate AMPAR dynamics. We have shown previously that mammalian AMPARs are subject to posttranslational modification by ubiquitin, with AMPAR ubiquitination enhancing receptor internalization and reducing AMPAR cell surface expression. Here we report a crucial role for epidermal growth factor receptor substrate 15 (Eps15), an endocytic adaptor, in ubiquitination-dependent AMPAR internalization. We find that suppression or overexpression of Eps15 results in changes in AMPAR surface expression. Eps15 interacts with AMPARs, which requires Nedd4-mediated GluA1 ubiquitination and the ubiquitin-interacting motif of Eps15. Importantly, we find that Eps15 plays an important role in AMPAR internalization. Knockdown of Eps15 suppresses the internalization of GluA1 but not the mutant GluA1 that lacks ubiquitination sites, indicating a role of Eps15 for the internalization of ubiquitinated AMPARs. These results reveal a novel molecular mechanism employed specifically for the trafficking of the ubiquitin-modified AMPARs.
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Affiliation(s)
- Amy Lin
- From the Department of Biology, Boston University, Boston, Massachusetts 02215
| | - Heng-Ye Man
- From the Department of Biology, Boston University, Boston, Massachusetts 02215
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Kuo CY, Li X, Kong XQ, Luo C, Chang CC, Chung Y, Shih HM, Li KK, Ann DK. An arginine-rich motif of ring finger protein 4 (RNF4) oversees the recruitment and degradation of the phosphorylated and SUMOylated Krüppel-associated box domain-associated protein 1 (KAP1)/TRIM28 protein during genotoxic stress. J Biol Chem 2014; 289:20757-72. [PMID: 24907272 DOI: 10.1074/jbc.m114.555672] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Krüppel-associated box domain-associated protein 1 (KAP1) is a universal transcriptional corepressor that undergoes multiple posttranslational modifications (PTMs), including SUMOylation and Ser-824 phosphorylation. However, the functional interplay of KAP1 PTMs in regulating KAP1 turnover during DNA damage response remains unclear. To decipher the role and cross-talk of multiple KAP1 PTMs, we show here that DNA double strand break-induced KAP1 Ser-824 phosphorylation promoted the recruitment of small ubiquitin-like modifier (SUMO)-targeted ubiquitin E3 ligase, ring finger protein 4 (RNF4), and subsequent RNF4-mediated, SUMO-dependent degradation. Besides the SUMO interacting motif (SIM), a previously unrecognized, but evolutionarily conserved, arginine-rich motif (ARM) in RNF4 acts as a novel recognition motif for selective target recruitment. Results from combined mutagenesis and computational modeling studies suggest that RNF4 utilizes concerted bimodular recognition, namely SIM for Lys-676 SUMOylation and ARM for Ser(P)-824 of simultaneously phosphorylated and SUMOylated KAP1 (Ser(P)-824-SUMO-KAP1). Furthermore, we proved that arginines 73 and 74 within the ARM of RNF4 are required for efficient recruitment to KAP1 or accelerated degradation of promyelocytic leukemia protein (PML) under stress. In parallel, results of bimolecular fluorescence complementation assays validated the role of the ARM in recognizing Ser(P)-824 in living cells. Taken together, we establish that the ARM is required for RNF4 to efficiently target Ser(P)-824-SUMO-KAP1, conferring ubiquitin Lys-48-mediated proteasomal degradation in the context of double strand breaks. The conservation of such a motif may possibly explain the requirement for timely substrate selectivity determination among a myriad of SUMOylated proteins under stress conditions. Thus, the ARM dynamically regulates the SIM-dependent recruitment of targets to RNF4, which could be critical to dynamically fine-tune the abundance of Ser(P)-824-SUMO-KAP1 and, potentially, other SUMOylated proteins during DNA damage response.
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Affiliation(s)
- Ching-Ying Kuo
- From the Department of Molecular Pharmacology and Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute, City of Hope, Duarte, California 91010
| | - Xu Li
- From the Department of Molecular Pharmacology and
| | - Xiang-Qian Kong
- the Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China
| | - Cheng Luo
- the Drug Discovery and Design Center, State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 555 Zu Chong Zhi Road, Shanghai 201203, China
| | - Che-Chang Chang
- the Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan, and
| | - Yiyin Chung
- From the Department of Molecular Pharmacology and
| | - Hsiu-Ming Shih
- the Institute of Biomedical Sciences, Academia Sinica, Taipei 11529, Taiwan, and
| | - Keqin Kathy Li
- the State Key Laboratory of Medical Genomics, Shanghai Institute of Hematology, Rui Jin Hospital Affiliated with Shanghai Jiao Tong University School of Medicine, 197 Ruijin II Road, Shanghai 200025, China
| | - David K Ann
- From the Department of Molecular Pharmacology and Irell and Manella Graduate School of Biological Sciences, Beckman Research Institute, City of Hope, Duarte, California 91010,
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35
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Pang X, Zhang J, Lopez H, Wang Y, Li W, O'Neill KL, Evans JJD, George NM, Long J, Chen Y, Luo X. The carboxyl-terminal tail of Noxa protein regulates the stability of Noxa and Mcl-1. J Biol Chem 2014; 289:17802-11. [PMID: 24811167 DOI: 10.1074/jbc.m114.548172] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [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: 01/12/2023] Open
Abstract
The BH3-only protein Noxa is a critical mediator of apoptosis and functions primarily by sequestering/inactivating the antiapoptotic Bcl-2 family protein Mcl-1. Although Noxa is a highly labile protein, recent studies suggested that it is degraded by the proteasome in a ubiquitylation-independent manner. In the present study, we investigated the mechanism of Noxa degradation and its ability to regulate the stability of Mcl-1. We found that the ubiquitylation-independent degradation of Noxa does not require a physical association with Mcl-1. A short stretch of amino acid residues in the C-terminal tail was found to mediate the proteasome-dependent degradation of Noxa. Ectopic placement of this degron was able to render other proteins unstable. Surprisingly, mutation of this sequence not only attenuated the rapid degradation of Noxa, but also stabilized endogenous Mcl-1 through the BH3-mediated direct interaction. Together, these results suggest that the C-terminal tail of Noxa regulates the stability of both Noxa and Mcl-1.
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Affiliation(s)
- Xiaming Pang
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-7696
| | - Jingjing Zhang
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-7696, the Xiangya School of Medicine, Central South University, Changsha 410013, China, and
| | - Hernando Lopez
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-7696
| | - Yushu Wang
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-7696, the School of Medicine, Shandong University, Jinan 250100, China
| | - Wenyang Li
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-7696
| | - Katelyn L O'Neill
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-7696
| | - Jacquelynn J D Evans
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-7696
| | - Nicholas M George
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-7696
| | - Jianhong Long
- the Xiangya School of Medicine, Central South University, Changsha 410013, China, and
| | - Yi Chen
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-7696
| | - Xu Luo
- From the Eppley Institute for Research in Cancer and Allied Diseases, University of Nebraska Medical Center, Omaha, Nebraska 68198-7696,
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36
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Choi BH, Pagano M, Huang C, Dai W. Cdh1, a substrate-recruiting component of anaphase-promoting complex/cyclosome (APC/C) ubiquitin E3 ligase, specifically interacts with phosphatase and tensin homolog (PTEN) and promotes its removal from chromatin. J Biol Chem 2014; 289:17951-9. [PMID: 24811168 DOI: 10.1074/jbc.m114.559005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [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: 11/06/2022] Open
Abstract
A pool of PTEN localizes to the nucleus. However, the exact mechanism by which nuclear PTEN is regulated remains unclear. We have recently reported that Plk1 specifically phosphorylates PTEN on Ser-380 during mitosis. Here we report that PTEN also localized to chromatin and that chromatin PTEN was removed by a proteasome-dependent process during mitotic exit. Pulldown analysis revealed that Cdh1, but not Cdc20, was significantly associated with PTEN. Cdh1 interacted with PTEN via two separate domains, and their interaction was enhanced by MG132, a proteasome inhibitor. Cdh1 negatively controlled the stability of chromatin PTEN by polyubiquitination. Phosphorylation of PTEN on Ser-380 impaired its interaction with Cdh1, thus positively regulating PTEN stability on chromatin. Significantly, the PTEN interaction with Cdh1 was phosphatase-independent, and Cdh1 knockdown via RNAi led to significant accumulation of chromatin PTEN, delaying mitotic exit. Combined, our studies identify Cdh1 as an important regulator of nuclear/chromatin PTEN during mitosis.
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Affiliation(s)
- Byeong Hyeok Choi
- From the Departments of Environmental Medicine, Biochemistry, and Molecular Pharmacology, New York University School of Medicine, Tuxedo, New York 10987
| | - Michele Pagano
- the Department of Pathology, New York University Cancer Institute, New York University School of Medicine, New York, New York 10016, and the Howard Hughes Medical Institute, New York University School of Medicine, New York, New York 10016
| | - Chaunshu Huang
- From the Departments of Environmental Medicine, Biochemistry, and Molecular Pharmacology, New York University School of Medicine, Tuxedo, New York 10987
| | - Wei Dai
- From the Departments of Environmental Medicine, Biochemistry, and Molecular Pharmacology, New York University School of Medicine, Tuxedo, New York 10987,
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Moroishi T, Yamauchi T, Nishiyama M, Nakayama KI. HERC2 targets the iron regulator FBXL5 for degradation and modulates iron metabolism. J Biol Chem 2014; 289:16430-41. [PMID: 24778179 DOI: 10.1074/jbc.m113.541490] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
FBXL5 (F-box and leucine-rich repeat protein 5) is the F-box protein subunit of, and therefore responsible for substrate recognition by, the SCF(FBXL5) ubiquitin-ligase complex, which targets iron regulatory protein 2 (IRP2) for proteasomal degradation. IRP2 plays a central role in the maintenance of cellular iron homeostasis in mammals through posttranscriptional regulation of proteins that contribute to control of the intracellular iron concentration. The FBXL5-IRP2 axis is integral to control of iron metabolism in vivo, given that mice lacking FBXL5 die during early embryogenesis as a result of unrestrained IRP2 activity and oxidative stress attributable to excessive iron accumulation. Despite its pivotal role in the control of iron homeostasis, however, little is known of the upstream regulation of FBXL5 activity. We now show that FBXL5 undergoes constitutive ubiquitin-dependent degradation at the steady state. With the use of a proteomics approach to the discovery of proteins that regulate the stability of FBXL5, we identified the large HECT-type ubiquitin ligase HERC2 (HECT and RLD domain containing E3 ubiquitin protein ligase 2) as an FBXL5-associated protein. Inhibition of the HERC2-FBXL5 interaction or depletion of endogenous HERC2 by RNA interference resulted in the stabilization of FBXL5 and a consequent increase in its abundance. Such accumulation of FBXL5 in turn led to a decrease in the intracellular content of ferrous iron. Our results thus suggest that HERC2 regulates the basal turnover of FBXL5, and that this ubiquitin-dependent degradation pathway contributes to the control of mammalian iron metabolism.
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Affiliation(s)
- Toshiro Moroishi
- From the Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Fukuoka 812-8582, Japan
| | - Takayoshi Yamauchi
- From the Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Fukuoka 812-8582, Japan
| | - Masaaki Nishiyama
- From the Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Fukuoka 812-8582, Japan
| | - Keiichi I Nakayama
- From the Department of Molecular and Cellular Biology, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka, Fukuoka 812-8582, Japan
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