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Houles T, Gravel SP, Lavoie G, Shin S, Savall M, Méant A, Grondin B, Gaboury L, Yoon SO, St-Pierre J, Roux PP. RSK Regulates PFK-2 Activity to Promote Metabolic Rewiring in Melanoma. Cancer Res 2018; 78:2191-2204. [DOI: 10.1158/0008-5472.can-17-2215] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2017] [Revised: 08/03/2017] [Accepted: 02/06/2018] [Indexed: 11/16/2022]
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Stefanoska K, Volkerling A, Bertz J, Poljak A, Ke YD, Ittner LM, Ittner A. An N-terminal motif unique to primate tau enables differential protein-protein interactions. J Biol Chem 2018; 293:3710-3719. [PMID: 29382714 DOI: 10.1074/jbc.ra118.001784] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2018] [Revised: 01/25/2018] [Indexed: 01/05/2023] Open
Abstract
Compared with other mammalian species, humans are particularly susceptible to tau-mediated neurodegenerative disorders. Differential interactions of the tau protein with other proteins are critical for mediating tau's physiological functions as well as tau-associated pathological processes. Primate tau harbors an 11-amino acid-long motif in its N-terminal region (residues 18-28), which is not present in non-primate species and whose function is unknown. Here, we used deletion mutagenesis to remove this sequence region from the longest human tau isoform, followed by glutathione S-transferase (GST) pulldown assays paired with isobaric tags for relative and absolute quantitation (iTRAQ) multiplex labeling, a quantitative method to measure protein abundance by mass spectrometry. Using this method, we found that the primate-specific N-terminal tau motif differentially mediates interactions with neuronal proteins. Among these binding partners are proteins involved in synaptic transmission (synapsin-1 and synaptotagmin-1) and signaling proteins of the 14-3-3 family. Furthermore, we identified an interaction of tau with a member of the annexin family (annexin A5) that was linked to the 11-residue motif. These results suggest that primate Tau has evolved specific residues that differentially regulate protein-protein interactions compared with tau proteins from other non-primate mammalian species. Our findings provide in vitro insights into tau's interactions with other proteins that may be relevant to human disease.
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Affiliation(s)
| | | | - Josefine Bertz
- From the Dementia Research Unit, School of Medical Sciences
| | - Anne Poljak
- the Bioanalytical Mass Spectrometry Facility, and
| | - Yazi D Ke
- the Motor Neuron Disease Unit, School of Medical Sciences, The University of New South Wales, Sydney, New South Wales 2052 and
| | - Lars M Ittner
- From the Dementia Research Unit, School of Medical Sciences, .,Neuroscience Australia, Sydney, New South Wales 2031, Australia
| | - Arne Ittner
- From the Dementia Research Unit, School of Medical Sciences
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Wang X, Cheng D, Jiang W, Ma Y. Mechanisms Underlying Aluminum Neurotoxicity Related to 14-3-3ζ Protein. Toxicol Sci 2018; 163:45-56. [DOI: 10.1093/toxsci/kfy021] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Affiliation(s)
- Xiaomei Wang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, People’s Republic of China
| | - Dai Cheng
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, People’s Republic of China
- College of Food Engineering and Biotechnology, Tianjin University of Science and Technology, Tianjin, People’s Republic of China
| | - Weibo Jiang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, People’s Republic of China
| | - Yuxia Ma
- Department of Nutrition and Hygiene, Hebei Medical University, Shijiazhuang, China
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Bajpai U, Sharma R, Kausar T, Dattagupta S, Chattopadhayay T, Ralhan R. Clinical Significance of 14-3-3 Zeta in Human Esophageal Cancer. Int J Biol Markers 2018; 23:231-7. [DOI: 10.1177/172460080802300406] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We recently found 14-3-3 zeta to be overexpressed in esophageal squamous cell carcinomas (ESCCs) by differential display. In the present study we determined the clinical significance of 14-3-3 zeta in esophageal tumorigenesis. Immunohistochemical analysis was carried out in 61 ESCCs, 33 dysplasia samples, 14 hyperplasia samples and 7 matched histologically normal esophageal tissues and correlated with clinicopathological parameters. Cytoplasmic expression of 14-3-3 zeta protein was observed in 95% of ESCCs; 63% of tumors also showed nuclear localization. All hyperplastic and dysplastic tissues distant from ESCCs as well as dysplastic endoscopic biopsies showed cytoplasmic immunopositivity for 14-3-3 zeta, while nuclear localization was observed in 58% of dysplasia and 36% of hyperplasia samples. Matched distant histologically normal epithelia either showed basal cytoplasmic expression of 14-3-3 zeta or no detectable nuclear expression of the protein. Interestingly, immunopositivity observed in normal esophageal tissues and early hyperplasia was confined to cytoplasm only, though significant nuclear expression was detected in dysplasia and ESCC. Immunoblotting and RT-PCR analyses further confirmed 14-3-3 zeta expression in dysplasia and ESCC. To our knowledge, this is the first report demonstrating overexpression of 14-3-3 zeta in esophageal hyperplasia, dysplasia and squamous cell carcinoma, suggesting that alteration in its expression occurs in early stages and is associated with esophageal tumorigenesis.
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Affiliation(s)
- U. Bajpai
- Department of Biomedical Sciences, Acharaya Narendra Dev College, University of Delhi South Campus, Delhi
| | - R. Sharma
- School of Biotechnology, Guru Gobind Singh Indraprastha University, Kashmere Gate, Delhi
| | - T. Kausar
- Department of Biochemistry, All India Institute of Medical Sciences, Ansari Nagar, New Delhi - India
| | - S. Dattagupta
- Department of Pathology, All India Institute of Medical Sciences, Ansari Nagar, New Delhi - India
| | - T.K. Chattopadhayay
- Department of Gastrointestinal Surgery, All India Institute of Medical Sciences, Ansari Nagar, New Delhi - India
| | - R. Ralhan
- Department of Biochemistry, All India Institute of Medical Sciences, Ansari Nagar, New Delhi - India
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Jandova Z, Trosanova Z, Weisova V, Oostenbrink C, Hritz J. Free energy calculations on the stability of the 14-3-3ζ protein. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2017; 1866:442-450. [PMID: 29203375 DOI: 10.1016/j.bbapap.2017.11.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 10/31/2017] [Accepted: 11/25/2017] [Indexed: 01/08/2023]
Abstract
Mutations of cysteine are often introduced to e.g. avoid formation of non-physiological inter-molecular disulfide bridges in in-vitro experiments, or to maintain specificity in labeling experiments. Alanine or serine is typically preferred, which usually do not alter the overall protein stability, when the original cysteine was surface exposed. However, selecting the optimal mutation for cysteines in the hydrophobic core of the protein is more challenging. In this work, the stability of selected Cys mutants of 14-3-3ζ was predicted by free-energy calculations and the obtained data were compared with experimentally determined stabilities. Both the computational predictions as well as the experimental validation point at a significant destabilization of mutants C94A and C94S. This destabilization could be attributed to the formation of hydrophobic cavities and a polar solvation of a hydrophilic side chain. A L12E, M78K double mutant was further studied in terms of its reduced dimerization propensity. In contrast to naïve expectations, this double mutant did not lead to the formation of strong salt bridges, which was rationalized in terms of a preferred solvation of the ionic species. Again, experiments agreed with the calculations by confirming the monomerization of the double mutants. Overall, the simulation data is in good agreement with experiments and offers additional insight into the stability and dimerization of this important family of regulatory proteins.
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Affiliation(s)
- Zuzana Jandova
- Institute of Molecular Modeling and Simulation, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Zuzana Trosanova
- CEITEC-MU, Masaryk University, Kamenice 753/5, Bohunice, Brno, Czech Republic
| | - Veronika Weisova
- CEITEC-MU, Masaryk University, Kamenice 753/5, Bohunice, Brno, Czech Republic
| | - Chris Oostenbrink
- Institute of Molecular Modeling and Simulation, University of Natural Resources and Life Sciences, Vienna, Austria.
| | - Jozef Hritz
- CEITEC-MU, Masaryk University, Kamenice 753/5, Bohunice, Brno, Czech Republic.
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Li F, Huang Y, Huang YY, Kuang YS, Wei YJ, Xiang L, Zhang XJ, Jia ZC, Jiang S, Li JY, Wan Y. MicroRNA-146a promotes IgE class switch in B cells via upregulating 14-3-3σ expression. Mol Immunol 2017; 92:180-189. [PMID: 29101850 DOI: 10.1016/j.molimm.2017.10.023] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Revised: 10/21/2017] [Accepted: 10/28/2017] [Indexed: 01/24/2023]
Abstract
B cells play a critical role in immune responses both in physiological and pathological conditions, and microRNAs have been shown to play important roles in regulating B cell proliferation and function. MiR-146a has been shown to modulate T cell immunity, but its function in regulating B cell response remains partially understood. Our previous studies indicated that germinal center (GC) B cells are significantly expanded in miR-146a-overexpressing (TG) mice. In this study, we further characterized the roles of miR-146a in regulating humoral immune responses to specific antigens. We found that the production of IgE antibody were significantly elevated in TG mice, while the antibody affinity maturation of IgM and IgG were similar between TG mice and the normal controls. We further found higher IgE antibody levels in TG B cell culture supernatant than that in normal controls. A global protein expression comparison of B cells from TG mice and the normal controls through TMT proteomic assay showed that 14-3-3σ, a key factor of immunoglobulin class switch DNA recombination (CSR) in B cells, was highly up-regulated in B cells with overexpression of miR-146a, while Smad4, the target of miR-146a, was decreased. Using an asthma model induced by OVA immunization, we further confirmed the increased level of OVA specific IgE antibodies in TG mice. These results demonstrate that miR-146a enhances class switch and secretion of IgE in B cells by upregulating 14-3-3σ expression, and suggest that miR-146a may be a potential target for asthma therapy.
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Affiliation(s)
- Fei Li
- Biomedical Analysis Center, Third Military Medical University, Chongqing 400038, China; Chongqing Key Laboratory of Cytomics, Chongqing 400038, China
| | - Yi Huang
- Biomedical Analysis Center, Third Military Medical University, Chongqing 400038, China; Chongqing Key Laboratory of Cytomics, Chongqing 400038, China
| | - You-Ying Huang
- Biomedical Analysis Center, Third Military Medical University, Chongqing 400038, China; Chongqing Key Laboratory of Cytomics, Chongqing 400038, China
| | - Yan-Song Kuang
- Biomedical Analysis Center, Third Military Medical University, Chongqing 400038, China; Chongqing Key Laboratory of Cytomics, Chongqing 400038, China
| | - Yong-Jian Wei
- Biomedical Analysis Center, Third Military Medical University, Chongqing 400038, China; Chongqing Key Laboratory of Cytomics, Chongqing 400038, China
| | - Li Xiang
- Biomedical Analysis Center, Third Military Medical University, Chongqing 400038, China; Chongqing Key Laboratory of Cytomics, Chongqing 400038, China
| | - Xing-Ju Zhang
- Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China
| | - Zheng-Cai Jia
- Biomedical Analysis Center, Third Military Medical University, Chongqing 400038, China; Chongqing Key Laboratory of Cytomics, Chongqing 400038, China
| | - Shan Jiang
- Institute for Advanced Study, Shenzhen University, Shenzhen 518060, China.
| | - Jing-Yi Li
- Department of Rheumatology, Southwest Hospital, Third Military Medical University, Chongqing 400038, China.
| | - Ying Wan
- Biomedical Analysis Center, Third Military Medical University, Chongqing 400038, China; Chongqing Key Laboratory of Cytomics, Chongqing 400038, China.
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Cornell B, Toyo-Oka K. 14-3-3 Proteins in Brain Development: Neurogenesis, Neuronal Migration and Neuromorphogenesis. Front Mol Neurosci 2017; 10:318. [PMID: 29075177 PMCID: PMC5643407 DOI: 10.3389/fnmol.2017.00318] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2017] [Accepted: 09/19/2017] [Indexed: 11/13/2022] Open
Abstract
The 14-3-3 proteins are a family of highly conserved, multifunctional proteins that are highly expressed in the brain during development. Cumulatively, the seven 14-3-3 isoforms make up approximately 1% of total soluble brain protein. Over the last decade, evidence has accumulated implicating the importance of the 14-3-3 protein family in the development of the nervous system, in particular cortical development, and have more recently been recognized as key regulators in a number of neurodevelopmental processes. In this review we will discuss the known roles of each 14-3-3 isoform in the development of the cortex, their relation to human neurodevelopmental disorders, as well as the challenges and questions that are left to be answered. In particular, we focus on the 14-3-3 isoforms and their involvement in the three key stages of cortical development; neurogenesis and differentiation, neuronal migration and neuromorphogenesis and synaptogenesis.
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Affiliation(s)
- Brett Cornell
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, PA, United States
| | - Kazuhito Toyo-Oka
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, PA, United States
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58
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14-3-3 Regulates Actin Filament Formation in the Deep-Branching Eukaryote Giardia lamblia. mSphere 2017; 2:mSphere00248-17. [PMID: 28932813 PMCID: PMC5597967 DOI: 10.1128/msphere.00248-17] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2017] [Accepted: 08/21/2017] [Indexed: 01/30/2023] Open
Abstract
The phosphoserine/phosphothreonine-binding protein 14-3-3 is known to regulate actin; this function has been previously attributed to sequestration of phosphorylated cofilin. 14-3-3 was identified as an actin-associated protein in the deep-branching eukaryote Giardia lamblia; however, Giardia lacks cofilin and all other canonical actin-binding proteins (ABPs). Thus, the role of G. lamblia 14-3-3 (Gl-14-3-3) in actin regulation was unknown. Gl-14-3-3 depletion resulted in an overall disruption of actin organization characterized by ectopically distributed short actin filaments. Using phosphatase and kinase inhibitors, we demonstrated that actin phosphorylation correlated with destabilization of the actin network and increased complex formation with 14-3-3, while blocking actin phosphorylation stabilized actin filaments and attenuated complex formation. Giardia's sole Rho family GTPase, Gl-Rac, modulates Gl-14-3-3's association with actin, providing the first connection between Gl-Rac and the actin cytoskeleton in Giardia. Giardia actin (Gl-actin) contains two putative 14-3-3 binding motifs, one of which (S330) is conserved in mammalian actin. Mutation of these sites reduced, but did not completely disrupt, the association with 14-3-3. Native gels and overlay assays indicate that intermediate proteins are required to support complex formation between 14-3-3 and actin. Overall, our results support a role for 14-3-3 as a regulator of actin; however, the presence of multiple 14-3-3-actin complexes suggests a more complex regulatory relationship than might be expected for a minimalistic parasite. IMPORTANCEGiardia lacks canonical actin-binding proteins. Gl-14-3-3 was identified as an actin interactor, but the significance of this interaction was unknown. Loss of Gl-14-3-3 results in ectopic short actin filaments, indicating that Gl-14-3-3 is an important regulator of the actin cytoskeleton in Giardia. Drug studies indicate that Gl-14-3-3 complex formation is in part phospho-regulated. We demonstrate that complex formation is downstream of Giardia's sole Rho family GTPase, Gl-Rac. This result provides the first mechanistic connection between Gl-Rac and Gl-actin in Giardia. Native gels and overlay assays indicate intermediate proteins are required to support the interaction between Gl-14-3-3 and Gl-actin, suggesting that Gl-14-3-3 is regulating multiple Gl-actin complexes.
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59
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Hepatic proteome changes induced by dietary supplementation with two levels of native chicory inulin in young pigs. Livest Sci 2017. [DOI: 10.1016/j.livsci.2017.07.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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60
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Trujillo-Ocampo A, Cázares-Raga FE, del Angel RM, Medina-Ramírez F, Santos-Argumedo L, Rodríguez MH, Hernández-Hernández FDLC. Participation of 14-3-3ε and 14-3-3ζ proteins in the phagocytosis, component of cellular immune response, in Aedes mosquito cell lines. Parasit Vectors 2017; 10:362. [PMID: 28764795 PMCID: PMC5540338 DOI: 10.1186/s13071-017-2267-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Accepted: 07/03/2017] [Indexed: 01/30/2023] Open
Abstract
BACKGROUND Better knowledge of the innate immune system of insects will improve our understanding of mosquitoes as potential vectors of diverse pathogens. The ubiquitously expressed 14-3-3 protein family is evolutionarily conserved from yeast to mammals, and at least two isoforms of 14-3-3, the ε and ζ, have been identified in insects. These proteins have been shown to participate in both humoral and cellular immune responses in Drosophila. As mosquitoes of the genus Aedes are the primary vectors for arboviruses, causing several diseases such as dengue fever, yellow fever, Zika and chikungunya fevers, cell lines derived from these mosquitoes, Aag-2 from Aedes aegypti and C6/36 HT from Aedes albopictus, are currently used to study the insect immune system. Here, we investigated the role of 14-3-3 proteins (ε and ζ isoform) in phagocytosis, the main cellular immune responses executed by the insects, using Aedes spp. cell lines. RESULTS We evaluated the mRNA and protein expression of 14-3-3ε and 14-3-3ζ in C6/36 HT and Aag-2 cells, and demonstrated that both proteins were localised in the cytoplasm. Further, in C6/36 HT cells treated with a 14-3-3 specific inhibitor we observed a notable modification of cell morphology with filopodia-like structure caused through cytoskeleton reorganisation (co-localization of 14-3-3 proteins with F-actin), more importantly the decrease in Salmonella typhimurium, Staphylococcus aureus and E. coli phagocytosis and reduction in phagolysosome formation. Additionally, silencing of 14-3-3ε and 14-3-3ζ expression by mean of specific DsiRNA confirmed the decreased phagocytosis and phagolysosome formation of pHrodo labelled E. coli and S. aureus bacteria by Aag-2 cells. CONCLUSION The 14-3-3ε and 14-3-3ζ proteins modulate cytoskeletal remodelling, and are essential for phagocytosis of Gram-positive and Gram-negative bacteria in Aedes spp. cell lines.
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Affiliation(s)
- Abel Trujillo-Ocampo
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Ciudad de México, Mexico
| | - Febe Elena Cázares-Raga
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Ciudad de México, Mexico
| | - Rosa María del Angel
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Ciudad de México, Mexico
| | - Fernando Medina-Ramírez
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Ciudad de México, Mexico
| | - Leopoldo Santos-Argumedo
- Departamento de Biomedicina Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Ciudad de México, Mexico
| | - Mario H. Rodríguez
- Centro de Investigación Sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública, Cuernavaca, Morelos Mexico
| | - Fidel de la Cruz Hernández-Hernández
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional (CINVESTAV-IPN), Ciudad de México, Mexico
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Bacterial co-expression of human Tau protein with protein kinase A and 14-3-3 for studies of 14-3-3/phospho-Tau interaction. PLoS One 2017; 12:e0178933. [PMID: 28575131 PMCID: PMC5456370 DOI: 10.1371/journal.pone.0178933] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 05/22/2017] [Indexed: 11/19/2022] Open
Abstract
Abundant regulatory 14-3-3 proteins have an extremely wide interactome and coordinate multiple cellular events via interaction with specifically phosphorylated partner proteins. Notwithstanding the key role of 14-3-3/phosphotarget interactions in many physiological and pathological processes, they are dramatically underexplored. Here, we focused on the 14-3-3 interaction with human Tau protein associated with the development of several neurodegenerative disorders, including Alzheimer’s and Parkinson’s diseases. Among many known phosphorylation sites within Tau, protein kinase A (PKA) phosphorylates several key residues of Tau and induces its tight interaction with 14-3-3 proteins. However, the stoichiometry and mechanism of 14-3-3 interaction with phosphorylated Tau (pTau) are not clearly elucidated. In this work, we describe a simple bacterial co-expression system aimed to facilitate biochemical and structural studies on the 14-3-3/pTau interaction. We show that dual co-expression of human fetal Tau with PKA in Escherichia coli results in multisite Tau phosphorylation including also naturally occurring sites which were not previously considered in the context of 14-3-3 binding. Tau protein co-expressed with PKA displays tight functional interaction with 14-3-3 isoforms of a different type. Upon triple co-expression with 14-3-3 and PKA, Tau protein could be co-purified with 14-3-3 and demonstrates complex which is similar to that formed in vitro between individual 14-3-3 and pTau obtained from dual co-expression. Although used in this study for the specific case of the previously known 14-3-3/pTau interaction, our co-expression system may be useful to study of other selected 14-3-3/phosphotarget interactions and for validations of 14-3-3 complexes identified by other methods.
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Zhang B, Gong A, Shi H, Bie Q, Liang Z, Wu P, Mao F, Qian H, Xu W. Identification of a novel YAP-14-3-3ζ negative feedback loop in gastric cancer. Oncotarget 2017; 8:71894-71910. [PMID: 29069755 PMCID: PMC5641098 DOI: 10.18632/oncotarget.18011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 05/09/2017] [Indexed: 12/18/2022] Open
Abstract
Growing evidence indicates that 14-3-3ζ and yes-associated protein (YAP) substantially promote tumorigenesis and tumor development. However, the regulatory mechanism underlying these two proteins remains unknown. Herein, we report a new regulatory role of 14-3-3ζ in the phosphorylation of YAP and the feedback inhibition of 14-3-3ζ by YAP. YAP and 14-3-3ζ expression exhibited a negative correlation in gastric cancer (GC) tissues. Moreover, patients with higher YAP and lower 14-3-3ζ expression had poor prognoses. Studies have revealed that 14-3-3ζ promotes cytoplasmic retention and suppresses the transcriptional activity of YAP by inducing its phosphorylation. Furthermore, we observed that the overexpression of YAP significantly reduced the expression of 14-3-3ζ by inducing its ubiquitination. YAP, 14-3-3ζ, and mouse double minute 2 homolog (MDM2) were colocalized, and the knockdown of MDM2 by siRNA attenuated the YAP-induced decrease of 14-3-3ζ. The binding of 14-3-3ζ and MDM2 was also restrained when the expression of YAP was interfered. Our results indicated the presence of a 14-3-3ζ–YAP negative regulatory feedback loop, which has a crucial role in cell proliferation and survival and is a potential target for the clinical treatment of GC.
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Affiliation(s)
- Bin Zhang
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
| | - Aihua Gong
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
| | - Hui Shi
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
| | - Qingli Bie
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
| | - Zhaofeng Liang
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
| | - Peipei Wu
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
| | - Fei Mao
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
| | - Hui Qian
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
| | - Wenrong Xu
- Key Laboratory of Laboratory Medicine of Jiangsu Province, School of Medicine, Jiangsu University, Zhenjiang, Jiangsu, P.R. China.,The Affiliated Hospital, Jiangsu University, Zhenjiang, Jiangsu, P.R. China
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Ng YS, Sorvina A, Bader CA, Weiland F, Lopez AF, Hoffmann P, Shandala T, Brooks DA. Proteome Analysis of Drosophila Mutants Identifies a Regulatory Role for 14-3-3ε in Metabolic Pathways. J Proteome Res 2017; 16:1976-1987. [PMID: 28365999 DOI: 10.1021/acs.jproteome.6b01032] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The evolutionary conserved family of 14-3-3 proteins appears to have a role in integrating numerous intracellular pathways, including signal transduction, intracellular trafficking, and metabolism. However, little is known about how this interactive network might be affected by the direct abrogation of 14-3-3 function. The loss of Drosophila 14-3-3ε resulted in reduced survival of mutants during larval-to-adult transition, which is known to depend on an energy supply coming from the histolysis of fat body tissue. Here we report a differential proteomic analysis of larval fat body tissue at the onset of larval-to-adult transition, with the loss of 14-3-3ε resulting in the altered abundance of 16 proteins. These included proteins linked to protein biosynthesis, glycolysis, tricarboxylic acid cycle, and lipid metabolic pathways. The ecdysone receptor (EcR), which is responsible for initiating the larval-to-adult transition, colocalized with 14-3-3ε in wild-type fat body tissues. The altered protein abundance in 14-3-3ε mutant fat body tissue was associated with transcriptional deregulation of alcohol dehydrogenase, fat body protein 1, and lamin genes, which are known targets of the EcR. This study indicates that 14-3-3ε has a critical role in cellular metabolism involving either molecular crosstalk with the EcR or direct interaction with metabolic proteins.
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Affiliation(s)
- Yeap S Ng
- Sansom Institute for Health Research, School of Pharmacy and Medical Sciences, University of South Australia , Adelaide, South Australia 5001, Australia
| | - Alexandra Sorvina
- Sansom Institute for Health Research, School of Pharmacy and Medical Sciences, University of South Australia , Adelaide, South Australia 5001, Australia
| | - Christie A Bader
- Sansom Institute for Health Research, School of Pharmacy and Medical Sciences, University of South Australia , Adelaide, South Australia 5001, Australia
| | - Florian Weiland
- Adelaide Proteomics Center, School of Molecular and Biomedical Sciences, University of Adelaide , Adelaide, South Australia 5005, Australia
| | - Angel F Lopez
- Centre for Cancer Biology , Adelaide, South Australia 5000, Australia
| | - Peter Hoffmann
- Adelaide Proteomics Center, School of Molecular and Biomedical Sciences, University of Adelaide , Adelaide, South Australia 5005, Australia
| | | | - Douglas A Brooks
- Sansom Institute for Health Research, School of Pharmacy and Medical Sciences, University of South Australia , Adelaide, South Australia 5001, Australia
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64
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Keicher J, Jaspert N, Weckermann K, Möller C, Throm C, Kintzi A, Oecking C. Arabidopsis 14-3-3 epsilon members contribute to polarity of PIN auxin carrier and auxin transport-related development. eLife 2017. [PMID: 28422008 DOI: 10.7554/elife.24336.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/08/2023] Open
Abstract
Eukaryotic 14-3-3 proteins have been implicated in the regulation of diverse biological processes by phosphorylation-dependent protein-protein interactions. The Arabidopsis genome encodes two groups of 14-3-3s, one of which - epsilon - is thought to fulfill conserved cellular functions. Here, we assessed the in vivo role of the ancestral 14-3-3 epsilon group members. Their simultaneous and conditional repression by RNA interference and artificial microRNA in seedlings led to altered distribution patterns of the phytohormone auxin and associated auxin transport-related phenotypes, such as agravitropic growth. Moreover, 14-3-3 epsilon members were required for pronounced polar distribution of PIN-FORMED auxin efflux carriers within the plasma membrane. Defects in defined post-Golgi trafficking processes proved causal for this phenotype and might be due to lack of direct 14-3-3 interactions with factors crucial for membrane trafficking. Taken together, our data demonstrate a fundamental role for the ancient 14-3-3 epsilon group members in regulating PIN polarity and plant development.
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Affiliation(s)
- Jutta Keicher
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Nina Jaspert
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Katrin Weckermann
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Claudia Möller
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Christian Throm
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Aaron Kintzi
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Claudia Oecking
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
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65
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Keicher J, Jaspert N, Weckermann K, Möller C, Throm C, Kintzi A, Oecking C. Arabidopsis 14-3-3 epsilon members contribute to polarity of PIN auxin carrier and auxin transport-related development. eLife 2017; 6. [PMID: 28422008 PMCID: PMC5397284 DOI: 10.7554/elife.24336] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 04/06/2017] [Indexed: 12/30/2022] Open
Abstract
Eukaryotic 14-3-3 proteins have been implicated in the regulation of diverse biological processes by phosphorylation-dependent protein-protein interactions. The Arabidopsis genome encodes two groups of 14-3-3s, one of which - epsilon - is thought to fulfill conserved cellular functions. Here, we assessed the in vivo role of the ancestral 14-3-3 epsilon group members. Their simultaneous and conditional repression by RNA interference and artificial microRNA in seedlings led to altered distribution patterns of the phytohormone auxin and associated auxin transport-related phenotypes, such as agravitropic growth. Moreover, 14-3-3 epsilon members were required for pronounced polar distribution of PIN-FORMED auxin efflux carriers within the plasma membrane. Defects in defined post-Golgi trafficking processes proved causal for this phenotype and might be due to lack of direct 14-3-3 interactions with factors crucial for membrane trafficking. Taken together, our data demonstrate a fundamental role for the ancient 14-3-3 epsilon group members in regulating PIN polarity and plant development.
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Affiliation(s)
- Jutta Keicher
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Nina Jaspert
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Katrin Weckermann
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Claudia Möller
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Christian Throm
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Aaron Kintzi
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Claudia Oecking
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
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66
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Keicher J, Jaspert N, Weckermann K, Möller C, Throm C, Kintzi A, Oecking C. Arabidopsis 14-3-3 epsilon members contribute to polarity of PIN auxin carrier and auxin transport-related development. eLife 2017; 6. [PMID: 28422008 DOI: 10.7554/elife.24336.021] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2016] [Accepted: 04/06/2017] [Indexed: 05/19/2023] Open
Abstract
Eukaryotic 14-3-3 proteins have been implicated in the regulation of diverse biological processes by phosphorylation-dependent protein-protein interactions. The Arabidopsis genome encodes two groups of 14-3-3s, one of which - epsilon - is thought to fulfill conserved cellular functions. Here, we assessed the in vivo role of the ancestral 14-3-3 epsilon group members. Their simultaneous and conditional repression by RNA interference and artificial microRNA in seedlings led to altered distribution patterns of the phytohormone auxin and associated auxin transport-related phenotypes, such as agravitropic growth. Moreover, 14-3-3 epsilon members were required for pronounced polar distribution of PIN-FORMED auxin efflux carriers within the plasma membrane. Defects in defined post-Golgi trafficking processes proved causal for this phenotype and might be due to lack of direct 14-3-3 interactions with factors crucial for membrane trafficking. Taken together, our data demonstrate a fundamental role for the ancient 14-3-3 epsilon group members in regulating PIN polarity and plant development.
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Affiliation(s)
- Jutta Keicher
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Nina Jaspert
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Katrin Weckermann
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Claudia Möller
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Christian Throm
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Aaron Kintzi
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
| | - Claudia Oecking
- Plant Physiology, Center for Plant Molecular Biology, University of Tübingen, Tübingen, Germany
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67
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Zhong X, Tian S, Zhang X, Diao X, Dong F, Yang J, Li Z, Sun L, Wang L, He X, Wu G, Hu X, Wang L, Song L, Zhang H, Pan X, Li A, Gao P. CUE domain-containing protein 2 promotes the Warburg effect and tumorigenesis. EMBO Rep 2017; 18:809-825. [PMID: 28325773 DOI: 10.15252/embr.201643617] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 02/05/2017] [Accepted: 02/15/2017] [Indexed: 12/12/2022] Open
Abstract
Cancer progression depends on cellular metabolic reprogramming as both direct and indirect consequence of oncogenic lesions; however, the underlying mechanisms are still poorly understood. Here, we report that CUEDC2 (CUE domain-containing protein 2) plays a vital role in facilitating aerobic glycolysis, or Warburg effect, in cancer cells. Mechanistically, we show that CUEDC2 upregulates the two key glycolytic proteins GLUT3 and LDHA via interacting with the glucocorticoid receptor (GR) or 14-3-3ζ, respectively. We further demonstrate that enhanced aerobic glycolysis is essential for the role of CUEDC2 to drive cancer progression. Moreover, using tissue microarray analysis, we show a correlation between the aberrant expression of CUEDC2, and GLUT3 and LDHA in clinical HCC samples, further demonstrating a link between CUEDC2 and the Warburg effect during cancer development. Taken together, our findings reveal a previously unappreciated function of CUEDC2 in cancer cell metabolism and tumorigenesis, illustrating how close oncogenic lesions are intertwined with metabolic alterations promoting cancer progression.
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Affiliation(s)
- Xiuying Zhong
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Shengya Tian
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Xiang Zhang
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Xinwei Diao
- Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing, China
| | - Fangting Dong
- Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing, China
| | - Jie Yang
- Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing, China
| | - Zhaoyong Li
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Linchong Sun
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Lin Wang
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Xiaoping He
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Gongwei Wu
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Xin Hu
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Lihua Wang
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Libing Song
- State Key Laboratory of Oncology in Southern China and Departments of Experimental Research, Sun Yat-sen University Cancer Center, Guangzhou, China
| | - Huafeng Zhang
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Xin Pan
- Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing, China
| | - Ailing Li
- Institute of Basic Medical Sciences, National Center of Biomedical Analysis, Beijing, China
| | - Ping Gao
- Hefei National Laboratory for Physical Sciences at Microscale, the CAS Key Laboratory of Innate Immunity and Chronic Disease, Innovation Center for Cell Signaling Network, School of Life Sciences, University of Science and Technology of China, Hefei, China
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68
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Tang YF, Zhang YB, Feng XD, Lin SH, Qiao N, Sun ZY, Zhou WP. Role of 14-3-3 proteins in human diseases. Shijie Huaren Xiaohua Zazhi 2017; 25:509-520. [DOI: 10.11569/wcjd.v25.i6.509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
14-3-3 proteins are a family of highly conserved small proteins. By interacting with target proteins, 14-3-3 proteins are involved in regulating multiple cellular processes, such as signal transduction, cell cycle regulation, apoptosis, cellular metabolism, cytoskeleton organization and malignant transformation. Mounting evidence suggests that 14-3-3 proteins play an important role in a wide variety of human diseases, such as human cancers and nervous system diseases. This review aims to summarize the current knowledge on the expression, regulation and biological function of 14-3-3 to highlight the role of 14-3-3 proteins in human diseases.
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69
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Sluchanko NN, Beelen S, Kulikova AA, Weeks SD, Antson AA, Gusev NB, Strelkov SV. Structural Basis for the Interaction of a Human Small Heat Shock Protein with the 14-3-3 Universal Signaling Regulator. Structure 2017; 25:305-316. [PMID: 28089448 PMCID: PMC5321513 DOI: 10.1016/j.str.2016.12.005] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2016] [Revised: 11/14/2016] [Accepted: 12/12/2016] [Indexed: 12/31/2022]
Abstract
By interacting with hundreds of protein partners, 14-3-3 proteins coordinate vital cellular processes. Phosphorylation of the small heat shock protein, HSPB6, within its intrinsically disordered N-terminal domain activates its interaction with 14-3-3, ultimately triggering smooth muscle relaxation. After analyzing the binding of an HSPB6-derived phosphopeptide to 14-3-3 using isothermal calorimetry and X-ray crystallography, we have determined the crystal structure of the complete assembly consisting of the 14-3-3 dimer and full-length HSPB6 dimer and further characterized this complex in solution using fluorescence spectroscopy, small-angle X-ray scattering, and limited proteolysis. We show that selected intrinsically disordered regions of HSPB6 are transformed into well-defined conformations upon the interaction, whereby an unexpectedly asymmetric structure is formed. This structure provides the first atomic resolution snapshot of a human small HSP in functional state, explains how 14-3-3 proteins sequester their regulatory partners, and can inform the design of small-molecule interaction modifiers to be used as myorelaxants.
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Affiliation(s)
- Nikolai N Sluchanko
- Laboratory of Structural Biochemistry of Proteins, A.N. Bach Institute of Biochemistry, Federal Research Center "Fundamentals of Biotechnology", Russian Academy of Sciences, 119071 Moscow, Russia.
| | - Steven Beelen
- Laboratory for Biocrystallography, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, 3000 Leuven, Belgium
| | - Alexandra A Kulikova
- Laboratory of Protein Conformational Polymorphism in Health and Disease, Engelhardt Institute of Molecular Biology, 119991 Moscow, Russia
| | - Stephen D Weeks
- Laboratory for Biocrystallography, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, 3000 Leuven, Belgium
| | - Alfred A Antson
- York Structural Biology Laboratory, Department of Chemistry, University of York, York YO10 5YW, UK
| | - Nikolai B Gusev
- Department of Biochemistry, School of Biology, Moscow State University, 119991 Moscow, Russia
| | - Sergei V Strelkov
- Laboratory for Biocrystallography, Department of Pharmaceutical and Pharmacological Sciences, KU Leuven, 3000 Leuven, Belgium.
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70
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Law HCH, Szeto SSW, Quan Q, Zhao Y, Zhang Z, Krakovska O, Lui LT, Zheng C, Lee SMY, Siu KWM, Wang Y, Chu IK. Characterization of the Molecular Mechanisms Underlying the Chronic Phase of Stroke in a Cynomolgus Monkey Model of Induced Cerebral Ischemia. J Proteome Res 2017; 16:1150-1166. [PMID: 28102082 DOI: 10.1021/acs.jproteome.6b00651] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Stroke is one of the main causes of mortality and long-term disability worldwide. The pathophysiological mechanisms underlying this disease are not well understood, particularly in the chronic phase after the initial ischemic episode. In this study, a Macaca fascicularis stroke model consisting of two sample groups, as determined by MRI-quantified infarct volumes as a measure of the stroke severity 28 days after the ischemic episode, was evaluated using qualitative and quantitative proteomics analyses. By using multiple online multidimensional liquid chromatography platforms, 8790 nonredundant proteins were identified that condensed to 5223 protein groups at 1% global false discovery rate (FDR). After the application of a conservative criterion (5% local FDR), 4906 protein groups were identified from the analysis of cerebral cortex. Of the 2068 quantified proteins, differential proteomic analyses revealed that 31 and 23 were dysregulated in the elevated- and low-infarct-volume groups, respectively. Neurogenesis, synaptogenesis, and inflammation featured prominently as the cellular processes associated with these dysregulated proteins. Protein interaction network analysis revealed that the dysregulated proteins for inflammation and neurogenesis were highly connected, suggesting potential cross-talk between these processes in modulating the cytoskeletal structure and dynamics in the chronic phase poststroke. Elucidating the long-term consequences of brain tissue injuries from a cellular prospective, as well as the molecular mechanisms that are involved, would provide a basis for the development of new potentially neurorestorative therapies.
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Affiliation(s)
- Henry C H Law
- Department of Chemistry, The University of Hong Kong , Hong Kong, China
| | - Samuel S W Szeto
- Department of Chemistry, The University of Hong Kong , Hong Kong, China
| | - Quan Quan
- Department of Chemistry, The University of Hong Kong , Hong Kong, China
| | - Yun Zhao
- Department of Chemistry, The University of Hong Kong , Hong Kong, China
| | - Zaijun Zhang
- Institute of New Drug Research and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of Traditional Chinese Medicine, College of Pharmacy, Jinan University , Guangzhou 510632, China
| | - Olga Krakovska
- Department of Chemistry and Centre for Research in Mass Spectrometry, York University , Toronto, Ontario M3J 1P3, Canada
| | - Leong Ting Lui
- Department of Chemistry, The University of Hong Kong , Hong Kong, China
| | - Chengyou Zheng
- Institute of New Drug Research and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of Traditional Chinese Medicine, College of Pharmacy, Jinan University , Guangzhou 510632, China
| | - Simon M-Y Lee
- State Key Laboratory of Quality Research in Chinese Medicine and Institute of Chinese Medical Sciences, University of Macau , Avenue Padre Tomás Pereira S.J., Taipa, Macau 999078, China
| | - K W Michael Siu
- Department of Chemistry and Centre for Research in Mass Spectrometry, York University , Toronto, Ontario M3J 1P3, Canada.,Department of Chemistry and Biochemistry, University of Windsor , Windsor, Ontario N9B 3P4, Canada
| | - Yuqiang Wang
- Institute of New Drug Research and Guangdong Province Key Laboratory of Pharmacodynamic Constituents of Traditional Chinese Medicine, College of Pharmacy, Jinan University , Guangzhou 510632, China
| | - Ivan K Chu
- Department of Chemistry, The University of Hong Kong , Hong Kong, China
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71
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Schmudlach A, Felton J, Kennedy RT, Dovichi NJ. Bottom-up proteomics analysis of the secretome of murine islets of Langerhans in elevated glucose levels. Analyst 2017; 142:284-291. [PMID: 27966681 DOI: 10.1039/c6an02268e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Glucotoxicity is a causative agent of type-2 diabetes, where high glucose levels damage the islets of Langerhans resulting in oxidative damage and endoplasmic reticulum stress. We evaluated the secretomes of healthy CD-1 murine islets. Three experimental conditions were investigated in biological triplicate: a control incubated with 11 mM glucose, 1-day incubation with 25 mM glucose, and 2-day incubation with 25 mM glucose. An SDS-based, filter-aided sample preparation protocol was used to prepare secretomes for analysis. A total of 428 protein groups were identified across the nine samples. Each condition generated between 328-349 protein IDs and intracondition protein overlap was between 66-90% for the biological triplicates. 232 protein groups were identified in all three conditions with 184 quantified at least once in each condition. Significant expression changes were observed for proteins associated with the unfolded protein response, such as proteases, chaperones, and elongation factors, as well as proteins associated with peptide hormone processing and small molecule metabolism.
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Affiliation(s)
- Andrew Schmudlach
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA.
| | - Jeremy Felton
- Departments of Chemistry and Pharmacology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Robert T Kennedy
- Departments of Chemistry and Pharmacology, University of Michigan, Ann Arbor, MI 48109, USA
| | - Norman J Dovichi
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, USA.
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Fukai M, Kobayashi N, Ishikawa T, Wakayama K, Shimada S, Umemoto K, Ohtani S, Fujiyoshi M, Yamashita K, Shimamura T, Taketomi A. 14-3-3ζ-Mediated Stimulation of Oxidative Phosphorylation Exacerbates Oxidative Damage Under Hypothermic Oxygenated Conditions in Human Renal Tubular Cells (HK-2). Transplant Proc 2017; 48:1288-91. [PMID: 27320606 DOI: 10.1016/j.transproceed.2015.09.066] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 09/03/2015] [Indexed: 12/13/2022]
Abstract
Cellular survival and death are at least partially regulated by the phosphorylation of proteins. A chaperon protein, 14-3-3ζ, regulates the activity of many proteins by covering the phosphorylation site within a 14-3-3 binding motif. Therefore, regulation of 14-3-3ζ activity may affect the fate of cells subjected to cold preservation and/or hypothermic oxygenated conditions. The present study assessed whether 14-3-3ζ protects cells from hypothermic oxygenation-induced injury and clarified its role in mitochondrial functions. Human renal tubular cell line HK-2 or 14-3-3ζ-overexpressed HK-2 (ζHK-2) cells were subjected to 72 hours of normoxic cold preservation in UW solution with or without antioxidants and hydroperoxides. Cellular death, adenosine triphosphate (ATP) content, and MTT catabolism were evaluated. Deferoxamine treatment reduced cellular death and augmented ATP content in both cell types. These indices were higher in ζHK-2, regardless of deferoxamine treatment. Exposure to hydroperoxides did not affect cellular death in either cell type, whereas hydroperoxide supplementation significantly reduced ATP content, except for low-dose hydrogen peroxide in HK-2 cells. MTT assay at normal state showed higher values in ζHK-2 cells, whereas it was impaired by hydroperoxides in both cell types. These results suggest that accumulation of hydroperoxides as a byproduct of the augmented oxidative phosphorylation by 14-3-3ζ overexpression causes mitochondrial dysfunction. In conclusion, despite possessing many potentially protective functions, 14-3-3ζ exacerbates cellular injury under hypothermic oxygenated conditions. 14-3-3ζ accelerates mitochondrial functions together with iron-dependent oxidative damage. Although further investigations are necessary, upregulation of 14-3-3ζ could be a method to maintain mitochondrial function under hypothermic oxygenated conditions, as shown in hypothermic machine preservation of renal grafts, when appropriate antioxidant treatment is administered.
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Affiliation(s)
- M Fukai
- Department of Transplant Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
| | - N Kobayashi
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
| | - T Ishikawa
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
| | - K Wakayama
- Department of Gastroenterological Surgery I, Hokkaido University Hospital, Sapporo, Hokkaido, Japan
| | - S Shimada
- Department of Gastroenterological Surgery I, Hokkaido University Hospital, Sapporo, Hokkaido, Japan.
| | - K Umemoto
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
| | - S Ohtani
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
| | - M Fujiyoshi
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
| | - K Yamashita
- Department of Transplant Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
| | - T Shimamura
- Division of Organ Transplantation, Central Clinical Facilities, Hokkaido University Hospital, Sapporo, Hokkaido, Japan
| | - A Taketomi
- Department of Gastroenterological Surgery I, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan
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73
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Varlamova EG, Cheremushkina IV. Contribution of mammalian selenocysteine-containing proteins to carcinogenesis. J Trace Elem Med Biol 2017; 39:76-85. [PMID: 27908428 DOI: 10.1016/j.jtemb.2016.08.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Revised: 07/28/2016] [Accepted: 08/09/2016] [Indexed: 12/17/2022]
Abstract
Oxidative stress caused by a sharp growth of free radicals in the organism is a major cause underlying the occurrence of all kinds of malignant formations. Selenium is an important essential trace element found in selenoproteins in the form of selenocysteine, an amino acid differing from cysteine for the presence of selenium instead of sulfur and making such proteins highly active. To date the role of selenium has been extensively investigated through studying the functions of selenoproteins in carcinogenesis. Analysis of the obtained results clearly demonstrates that selenoproteins can act as oncosuppressors, but can also, on the contrary, favor the formation of malignant tumors.
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Affiliation(s)
- Elena Gennadyevna Varlamova
- Federal State Institution of Science Institute of Cell Biophysics, Russian Academy of Sciences, Moscow Region, Institutskaya st. 3, 142290, Pushchino, Russia.
| | - Irina Valentinovna Cheremushkina
- Federal State Educational Institution of Higher Education Voronezh State University of Engineering Technology, Prospect revolution st. 19, 394000, Voronezh, Russia.
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74
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Tisdale EJ, Talati NK, Artalejo CR, Shisheva A. GAPDH binds Akt to facilitate cargo transport in the early secretory pathway. Exp Cell Res 2016; 349:310-319. [PMID: 27818247 DOI: 10.1016/j.yexcr.2016.10.025] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 10/12/2016] [Accepted: 10/31/2016] [Indexed: 01/12/2023]
Abstract
Glyceraldehyde-3-phosphate dehydrogenase (GAPDH) undergoes numerous post-translational modifications, which impart new function and influence intracellular location. For example, atypical PKC ι/λ phosphorylates GAPDH that locates to vesicular tubular clusters and is required for retrograde membrane trafficking in the early secretory pathway. GAPDH is also required in the endocytic pathway; substitution of Pro234 to Ser (Pro234Ser) rendered CHO cells defective in endocytosis. To determine if GAPDH (Pro234Ser) could inhibit endoplasmic reticulum to Golgi trafficking, we introduced the recombinant mutant enzyme into several biochemical and morphological transport assays. The mutant protein efficiently blocked vesicular stomatitis virus-G protein transport. Because GAPDH binds to microtubules (MTs), we evaluated MT binding and MT intracellular distribution in the presence of the mutant. Although these properties were not changed relative to wild-type, GAPDH (Pro234Ser) altered Golgi complex morphology. We determined that the GAPDH point mutation disrupted association between the enzyme and the serine/threonine kinase Akt. Interestingly Rab1, which functions in anterograde-directed trafficking, stimulates GAPDH-Akt association with membranes in a quantitative binding assay. In contrast, Rab2 does not stimulate GAPDH-Akt membrane binding but instead recruits GAPDH-aPKC. We propose a mechanism whereby the association of GAPDH with Akt or with aPKC serves as a switch to discriminate between anterograde directed cargo and recycling cargo retrieved back to the ER, respectively.
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Affiliation(s)
- Ellen J Tisdale
- Department of Pharmacology, Wayne State University School of Medicine, 540 E. Canfield Ave., 6374 Scott Hall, Detroit, MI 48201, USA.
| | - Nikunj K Talati
- Department of Pharmacology, Wayne State University School of Medicine, 540 E. Canfield Ave., 6374 Scott Hall, Detroit, MI 48201, USA
| | - Cristina R Artalejo
- Department of Pharmacology, Wayne State University School of Medicine, 540 E. Canfield Ave., 6374 Scott Hall, Detroit, MI 48201, USA
| | - Assia Shisheva
- Department of Physiology, Wayne State University School of Medicine, 540 E. Canfield Ave., 6374 Scott Hall, Detroit, MI 48201, USA
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75
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Trujillo-Ocampo A, Cázares-Raga FE, Celestino-Montes A, Cortés-Martínez L, Rodríguez MH, Hernández-Hernández FDLC. IDENTIFICATION AND EXPRESSION ANALYSIS OF TWO 14-3-3 PROTEINS IN THE MOSQUITO Aedes aegypti, AN IMPORTANT ARBOVIRUSES VECTOR. ARCHIVES OF INSECT BIOCHEMISTRY AND PHYSIOLOGY 2016; 93:143-159. [PMID: 27592842 DOI: 10.1002/arch.21348] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The 14-3-3 proteins are evolutionarily conserved acidic proteins that form a family with several isoforms in many cell types of plants and animals. In invertebrates, including dipteran and lepidopteran insects, only two isoforms have been reported. 14-3-3 proteins are scaffold molecules that form homo- or heterodimeric complexes, acting as molecular adaptors mediating phosphorylation-dependent interactions with signaling molecules involved in immunity, cell differentiation, cell cycle, proliferation, apoptosis, and cancer. Here, we describe the presence of two isoforms of 14-3-3 in the mosquito Aedes aegypti, the main vector of dengue, yellow fever, chikungunya, and zika viruses. Both isoforms have the conserved characteristics of the family: two protein signatures (PS1 and PS2), an annexin domain, three serine residues, targets for phosphorylation (positions 58, 184, and 233), necessary for their function, and nine alpha helix-forming segments. By sequence alignment and phylogenetic analysis, we found that the molecules correspond to Ɛ and ζ isoforms (Aeae14-3-3ε and Aeae14-3-3ζ). The messengers and protein products were present in all stages of the mosquito life cycle and all the tissues analyzed, with a small predominance of Aeae14-3-3ζ except in the midgut and ovaries of adult females. The 14-3-3 proteins in female midgut epithelial cells were located in the cytoplasm. Our results may provide insights to further investigate the functions of these proteins in mosquitoes.
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Affiliation(s)
- Abel Trujillo-Ocampo
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, México
| | - Febe Elena Cázares-Raga
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, México
| | - Antonio Celestino-Montes
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, México
| | - Leticia Cortés-Martínez
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, México
| | - Mario H Rodríguez
- Centro de Investigación Sobre Enfermedades Infecciosas, Instituto Nacional de Salud Pública, Cuernavaca, Morelos, México
| | - Fidel de la Cruz Hernández-Hernández
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Ciudad de México, México.
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76
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14-3-3ζ regulates the mitochondrial respiratory reserve linked to platelet phosphatidylserine exposure and procoagulant function. Nat Commun 2016; 7:12862. [PMID: 27670677 PMCID: PMC5052641 DOI: 10.1038/ncomms12862] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 08/10/2016] [Indexed: 12/12/2022] Open
Abstract
The 14-3-3 family of adaptor proteins regulate diverse cellular functions including cell proliferation, metabolism, adhesion and apoptosis. Platelets express numerous 14-3-3 isoforms, including 14-3-3ζ, which has previously been implicated in regulating GPIbα function. Here we show an important role for 14-3-3ζ in regulating arterial thrombosis. Interestingly, this thrombosis defect is not related to alterations in von Willebrand factor (VWF)–GPIb adhesive function or platelet activation, but instead associated with reduced platelet phosphatidylserine (PS) exposure and procoagulant function. Decreased PS exposure in 14-3-3ζ-deficient platelets is associated with more sustained levels of metabolic ATP and increased mitochondrial respiratory reserve, independent of alterations in cytosolic calcium flux. Reduced platelet PS exposure in 14-3-3ζ-deficient mice does not increase bleeding risk, but results in decreased thrombin generation and protection from pulmonary embolism, leading to prolonged survival. Our studies define an important role for 14-3-3ζ in regulating platelet bioenergetics, leading to decreased platelet PS exposure and procoagulant function. Platelets express negatively charged phosphatidylserine (PS) on their plasma membrane when propagating coagulation within a developing thrombus. Here the authors show that an adaptor protein 14-3-3 regulates mitochondrial function and PS exposure and thus platelet procoagulant activity, promising a new therapy to reduce thrombosis.
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77
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Palanisamy AP, Suryakumar G, Panneerselvam K, Willey CD, Kuppuswamy D. A Kinase-Independent Function of c-Src Mediates p130Cas Phosphorylation at the Serine-639 Site in Pressure Overloaded Myocardium. J Cell Biochem 2016; 116:2793-803. [PMID: 25976166 DOI: 10.1002/jcb.25224] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2015] [Accepted: 05/08/2015] [Indexed: 12/11/2022]
Abstract
Early work in pressure overloaded (PO) myocardium shows that integrins mediate focal adhesion complex formation by recruiting the adaptor protein p130Cas (Cas) and nonreceptor tyrosine kinase c-Src. To explore c-Src role in Cas-associated changes during PO, we used a feline right ventricular in vivo PO model and a three-dimensional (3D) collagen-embedded adult cardiomyocyte in vitro model that utilizes a Gly-Arg-Gly-Asp-Ser (RGD) peptide for integrin stimulation. Cas showed slow electrophoretic mobility (band-shifting), recruitment to the cytoskeleton, and tyrosine phosphorylation at 165, 249, and 410 sites in both 48 h PO myocardium and 1 h RGD-stimulated cardiomyocytes. Adenoviral mediated expression of kinase inactive (negative) c-Src mutant with intact scaffold domains (KN-Src) in cardiomyocytes did not block the RGD stimulated changes in Cas. Furthermore, expression of KN-Src or kinase active c-Src mutant with intact scaffold function (A-Src) in two-dimensionally (2D) cultured cardiomyocytes was sufficient to cause Cas band-shifting, although tyrosine phosphorylation required A-Src. These data indicate that c-Src's adaptor function, but not its kinase function, is required for a serine/threonine specific phosphorylation(s) responsible for Cas band-shifting. To explore this possibility, Chinese hamster ovary cells that stably express Cas were infected with either β-gal or KN-Src adenoviruses and used for Cas immunoprecipitation combined with mass spectrometry analysis. In the KN-Src expressing cells, Cas showed phosphorylation at the serine-639 (human numbering) site. A polyclonal antibody raised against phospho-serine-639 detected Cas phosphorylation in 24-48 h PO myocardium. Our studies indicate that c-Src's adaptor function mediates serine-639 phosphorylation of Cas during integrin activation in PO myocardium.
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Affiliation(s)
- Arun P Palanisamy
- Division of Cardiology, Department of Medicine, Gazes Cardiac Research Institute, Medical University of South Carolina, Charleston, South Carolina, 29425-2221
| | - Geetha Suryakumar
- Division of Cardiology, Department of Medicine, Gazes Cardiac Research Institute, Medical University of South Carolina, Charleston, South Carolina, 29425-2221
| | - Kavin Panneerselvam
- Division of Cardiology, Department of Medicine, Gazes Cardiac Research Institute, Medical University of South Carolina, Charleston, South Carolina, 29425-2221
| | - Christopher D Willey
- Division of Cardiology, Department of Medicine, Gazes Cardiac Research Institute, Medical University of South Carolina, Charleston, South Carolina, 29425-2221
| | - Dhandapani Kuppuswamy
- Division of Cardiology, Department of Medicine, Gazes Cardiac Research Institute, Medical University of South Carolina, Charleston, South Carolina, 29425-2221
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78
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Mohammad DK, Nore BF, Gustafsson MO, Mohamed AJ, Smith CIE. Protein kinase B (AKT) regulates SYK activity and shuttling through 14-3-3 and importin 7. Int J Biochem Cell Biol 2016; 78:63-74. [PMID: 27381982 DOI: 10.1016/j.biocel.2016.06.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 05/24/2016] [Accepted: 06/30/2016] [Indexed: 01/10/2023]
Abstract
The Protein kinase B (AKT) regulates a plethora of intracellular signaling proteins to fine-tune signaling of multiple pathways. Here, we found that following B-cell receptor (BCR)-induced tyrosine phosphorylation of the cytoplasmic tyrosine kinase SYK and the adaptor BLNK, the AKT/PKB enzyme strongly induced BLNK (>100-fold) and SYK (>100-fold) serine/threonine phosphorylation (pS/pT). Increased phosphorylation promoted 14-3-3 binding to BLNK (37-fold) and SYK (2.5-fold) in a pS/pT-concentration dependent manner. We also demonstrated that the AKT inhibitor MK2206 reduced pS/pT of both BLNK (3-fold) and SYK (2.5-fold). Notably, the AKT phosphatase, PHLPP2 maintained the activating phosphorylation of BLNK at Y84 and increased protein stability (8.5-fold). In addition, 14-3-3 was required for the regulation SYK's interaction with BLNK and attenuated SYK binding to Importin 7 (5-fold), thereby perturbing shuttling to the nucleus. Moreover, 14-3-3 proteins also sustained tyrosine phosphorylation of SYK and BLNK. Furthermore, substitution of S295 or S297 for alanine abrogated SYK's binding to Importin 7. SYK with S295A or S297A replacements showed intense pY525/526 phosphorylation, and BLNK pY84 phosphorylation correlated with the SYK pY525/526 phosphorylation level. Conversely, the corresponding mutations to aspartic acid in SYK reduced pY525/526 phosphorylation. Collectively, these and previous results suggest that AKT and 14-3-3 proteins down-regulate the activity of several BCR-associated components, including BTK, BLNK and SYK and also inhibit SYK's interaction with Importin 7.
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Affiliation(s)
- Dara K Mohammad
- Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Karolinska Hospital Huddinge, SE-141 86 Huddinge, Stockholm, Sweden; Department of Biology, College of Science, University of Salahaddin, Erbil, Kurdistan Region, Iraq.
| | - Beston F Nore
- Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Karolinska Hospital Huddinge, SE-141 86 Huddinge, Stockholm, Sweden; Department of Biochemistry, School of Medicine, University of Sulaimani, Sulaimaniyah, Kurdistan Region, Iraq
| | - Manuela O Gustafsson
- Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Karolinska Hospital Huddinge, SE-141 86 Huddinge, Stockholm, Sweden
| | - Abdalla J Mohamed
- Universiti Brunei Darussalam, Environmental and Life Sciences, Faculty of Science, Jalan Tungku Link, Gadong BE1410 Negara Brunei Darussalam, Brunei
| | - C I Edvard Smith
- Department of Laboratory Medicine, Clinical Research Center, Karolinska Institutet, Karolinska Hospital Huddinge, SE-141 86 Huddinge, Stockholm, Sweden.
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79
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Corradini E, Klaasse G, Leurs U, Heck AJR, Martin NI, Scholten A. Charting the interactome of PDE3A in human cells using an IBMX based chemical proteomics approach. MOLECULAR BIOSYSTEMS 2016. [PMID: 26205238 DOI: 10.1039/c5mb00142k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
In the cell the second messenger cyclic nucleotides cAMP and cGMP mediate a wide variety of external signals. Both signaling molecules are degraded by the superfamily of phosphodiesterases (PDEs) consisting of more than 50 different isoforms. Several of these PDEs are implicated in disease processes inspiring the quest for and synthesis of selective PDE inhibitors, that unfortunately have led to very mixed successes in clinical trials. This may be partially caused by their pharmacological action. Accumulating data suggests that small differences between different PDE isoforms may already result in specific tissue distributions, cellular localization and different involvement in higher order signal protein complexes. The role of PDEs in these higher order signal protein complexes has only been marginally addressed, as no screening methodology is available to address this in a more comprehensive way. Affinity based chemical proteomics is a relatively new tool to identify specific protein-protein interactions. Here, to study the interactome of PDEs, we synthesized a broad spectrum PDE-capturing resin based on the non-selective PDE inhibitor 3-isobutyl-1-methylxanthine (IBMX). Chemical proteomics characterization of this resin in HeLa cell lysates led to the capture of several different PDEs. Combining the IBMX-resin with in-solution competition with the available more selective PDE inhibitors, cilostamide and papaverine, allowed us to selectively probe the interactome of PDE3A in HeLa cells. Besides known interactors such as the family of 14-3-3 proteins, PDE3A was found to associate with a PP2A complex composed of a regulatory, scaffold and catalytic subunit.
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Affiliation(s)
- Eleonora Corradini
- Biomolecular Mass Spectrometry and Proteomics, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, Science Faculty, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.
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80
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Shao Z, Cai Y, Xu L, Yao X, Shi J, Zhang F, Luo Y, Zheng K, Liu J, Deng F, Li R, Zhang L, Wang H, Li M, Ding Y, Zhao L. Loss of the 14-3-3σ is essential for LASP1-mediated colorectal cancer progression via activating PI3K/AKT signaling pathway. Sci Rep 2016; 6:25631. [PMID: 27156963 PMCID: PMC4860602 DOI: 10.1038/srep25631] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2016] [Accepted: 04/20/2016] [Indexed: 12/20/2022] Open
Abstract
LIM and SH3 protein 1 (LASP1) can promote colorectal cancer (CRC) progression and metastasis, but the direct evidence that elucidates the molecular mechanism remains unclear. Here, our proteomic data showed that LASP1 interacted with 14-3-3σ and decreased the expression of 14-3-3σ in CRC. Deletion of 14-3-3σ was required for LASP1-mediated CRC cell aggressiveness. In vitro gain- and loss-of-function assays showed that 14-3-3σ suppressed the ability of cell migration and decreased the phosphorylation of AKT in CRC cells. We further observed clearly co-localization between AKT and 14-3-3σ in CRC cells. Treatment of PI3K inhibitor LY294002 markedly prevented phosphorylation of AKT and subsequently counteract aggressive phenotype mediated by siRNA of 14-3-3σ. Clinically, 14-3-3σ is frequently down-regulated in CRC tissues. Down-regulation of 14-3-3σ is associated with tumor progression and poor prognosis of patients with CRC. Multivariate analysis confirmed low expression of 14-3-3σ as an independent prognostic factor for CRC. A combination of low 14-3-3σ and high LASP1 expression shows a worse trend with overall survival of CRC patients. Our research paves the path to future investigation of the LASP1-14-3-3σ axis as a target for novel anticancer therapies of advanced CRC.
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Affiliation(s)
- Ziyun Shao
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yanjun Cai
- Department of Gerontology, Guangzhou General Hospital of the Guangzhou Military Command of the People's Liberation Army (PLA), Guangzhou, China
| | - Lijun Xu
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Xueqing Yao
- The Department of General Surgery, Guangdong General Hospital, Guangdong Academy of Medical Science, Guangzhou, Guangdong, China
| | - Jiaolong Shi
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Feifei Zhang
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yuhao Luo
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Kehong Zheng
- Department of General Surgery, Zhujiang Hospital, Southern Medical University, Guangzhou, China
| | - Jian Liu
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Fengliu Deng
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Rui Li
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Lanzhi Zhang
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Hui Wang
- Department of Medical Oncology, Affiliated Tumor Hospital of Guangzhou Medical University, Guangzhou, China
| | - Mingyi Li
- Radiotherapy Department, Affiliated Tumor Hospital of Guangzhou Medical University, Guangzhou, China
| | - Yanqing Ding
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
| | - Liang Zhao
- Department of Pathology, Nanfang Hospital, Southern Medical University, Guangzhou, China.,Department of Pathology, School of Basic Medical Sciences, Southern Medical University, Guangzhou, China
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81
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Tashiro E, Imoto M. Screening and target identification of bioactive compounds that modulate cell migration and autophagy. Bioorg Med Chem 2016; 24:3283-90. [PMID: 27094149 DOI: 10.1016/j.bmc.2016.04.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 04/03/2016] [Accepted: 04/06/2016] [Indexed: 11/18/2022]
Abstract
Cell migration is a fundamental step for embryonic development, wound repair, immune responses, and tumor cell invasion and metastasis. It is well known that protrusive structures, namely filopodia and lamellipodia, can be observed at the leading edge of migrating cells. The formation of these structures is necessary for cell migration; however, the molecular mechanisms behind the formation of these structures remain largely unclear. Therefore, bioactive compounds that modulate protrusive structures are extremely powerful tools for studying the mechanisms behind the formation of these structures and subsequent cell migration. Therefore, we have screened for bioactive compounds that inhibit the formation of filopodia, lamellipodia, or cell migration from natural products, and attempted to identify the target molecules of our isolated compounds. Additionally, autophagy is a bulk, non-specific protein degradation system that is involved in the pathogenesis of cancer and neurodegenerative disorders. Recent extensive studies have revealed the molecular mechanisms of autophagy, however, they also remain largely unclear. Thus, we also have screened for bioactive compounds that modulate autophagy, and identified the target molecules. In the present article, we introduce the phenotypic screening system and target identification of four bioactive compounds.
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Affiliation(s)
- Etsu Tashiro
- Department of Biosciences and Informatics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama City 223-8522, Japan
| | - Masaya Imoto
- Department of Biosciences and Informatics, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama City 223-8522, Japan.
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82
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Liu C, Song X, Nisbet R, Götz J. Co-immunoprecipitation with Tau Isoform-specific Antibodies Reveals Distinct Protein Interactions and Highlights a Putative Role for 2N Tau in Disease. J Biol Chem 2016; 291:8173-88. [PMID: 26861879 PMCID: PMC4825019 DOI: 10.1074/jbc.m115.641902] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Indexed: 01/24/2023] Open
Abstract
Alternative splicing generates multiple isoforms of the microtubule-associated protein Tau, but little is known about their specific function. In the adult mouse brain, three Tau isoforms are expressed that contain either 0, 1, or 2 N-terminal inserts (0N, 1N, and 2N). We generated Tau isoform-specific antibodies and performed co-immunoprecipitations followed by tandem mass tag multiplexed quantitative mass spectrometry. We identified novel Tau-interacting proteins of which one-half comprised membrane-bound proteins, localized to the plasma membrane, mitochondria, and other organelles. Tau was also found to interact with proteins involved in presynaptic signal transduction. MetaCore analysis revealed one major Tau interaction cluster that contained 33 Tau pulldown proteins. To explore the pathways in which these proteins are involved, we conducted an ingenuity pathway analysis that revealed two significant overlapping pathways, “cell-to-cell signaling and interaction” and “neurological disease.” The functional enrichment tool DAVID showed that in particular the 2N Tau-interacting proteins were specifically associated with neurological disease. Finally, for a subset of Tau interactions (apolipoprotein A1 (apoA1), apoE, mitochondrial creatine kinase U-type, β-synuclein, synaptogyrin-3, synaptophysin, syntaxin 1B, synaptotagmin, and synapsin 1), we performed reverse co-immunoprecipitations, confirming the preferential interaction of specific isoforms. For example, apoA1 displayed a 5-fold preference for the interaction with 2N, whereas β-synuclein showed preference for 0N. Remarkably, a reverse immunoprecipitation with apoA1 detected only the 2N isoform. This highlights distinct protein interactions of the different Tau isoforms, suggesting that they execute different functions in brain tissue.
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Affiliation(s)
- Chang Liu
- From the Sydney Medical School, Brain and Mind Research Institute, University of Sydney, Camperdown, New South Wales 2050
| | - Xiaomin Song
- the Australian Proteome Analysis Facility, Macquarie University (Sydney), New South Wales 2109, and
| | - Rebecca Nisbet
- the Clem Jones Centre for Ageing Dementia Research, Queensland Brain Institute, University of Queensland, St. Lucia Campus (Brisbane), Queensland 4072, Australia
| | - Jürgen Götz
- the Clem Jones Centre for Ageing Dementia Research, Queensland Brain Institute, University of Queensland, St. Lucia Campus (Brisbane), Queensland 4072, Australia
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83
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Moeller HB, Slengerik-Hansen J, Aroankins T, Assentoft M, MacAulay N, Moestrup SK, Bhalla V, Fenton RA. Regulation of the Water Channel Aquaporin-2 via 14-3-3θ and -ζ. J Biol Chem 2015; 291:2469-84. [PMID: 26645691 DOI: 10.1074/jbc.m115.691121] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2015] [Indexed: 12/21/2022] Open
Abstract
The 14-3-3 family of proteins are multifunctional proteins that interact with many of their cellular targets in a phosphorylation-dependent manner. Here, we determined that 14-3-3 proteins interact with phosphorylated forms of the water channel aquaporin-2 (AQP2) and modulate its function. With the exception of σ, all 14-3-3 isoforms were abundantly expressed in mouse kidney and mouse kidney collecting duct cells (mpkCCD14). Long-term treatment of mpkCCD14 cells with the type 2 vasopressin receptor agonist dDAVP increased mRNA and protein levels of AQP2 alongside 14-3-3β and -ζ, whereas levels of 14-3-3η and -θ were decreased. Co-immunoprecipitation (co-IP) studies in mpkCCD14 cells uncovered an AQP2/14-3-3 interaction that was modulated by acute dDAVP treatment. Additional co-IP studies in HEK293 cells determined that AQP2 interacts selectively with 14-3-3ζ and -θ. Use of phosphatase inhibitors in mpkCCD14 cells, co-IP with phosphorylation deficient forms of AQP2 expressed in HEK293 cells, or surface plasmon resonance studies determined that the AQP2/14-3-3 interaction was modulated by phosphorylation of AQP2 at various sites in its carboxyl terminus, with Ser-256 phosphorylation critical for the interactions. shRNA-mediated knockdown of 14-3-3ζ in mpkCCD14 cells resulted in increased AQP2 ubiquitylation, decreased AQP2 protein half-life, and reduced AQP2 levels. In contrast, knockdown of 14-3-3θ resulted in increased AQP2 half-life and increased AQP2 levels. In conclusion, this study demonstrates phosphorylation-dependent interactions of AQP2 with 14-3-3θ and -ζ. These interactions play divergent roles in modulating AQP2 trafficking, phosphorylation, ubiquitylation, and degradation.
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Affiliation(s)
- Hanne B Moeller
- From the Department of Biomedicine and Center for Interactions of Proteins in Epithelial Transport, Aarhus University, 8000 Aarhus, Denmark
| | - Joachim Slengerik-Hansen
- From the Department of Biomedicine and Center for Interactions of Proteins in Epithelial Transport, Aarhus University, 8000 Aarhus, Denmark
| | - Takwa Aroankins
- From the Department of Biomedicine and Center for Interactions of Proteins in Epithelial Transport, Aarhus University, 8000 Aarhus, Denmark
| | - Mette Assentoft
- the Department of Neuroscience and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Nanna MacAulay
- the Department of Neuroscience and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, 2200 Copenhagen, Denmark
| | - Soeren K Moestrup
- From the Department of Biomedicine and Center for Interactions of Proteins in Epithelial Transport, Aarhus University, 8000 Aarhus, Denmark, the Institute of Molecular Medicine, University of Southern Denmark, 5000 Odense, Denmark, and
| | - Vivek Bhalla
- the Division of Nephrology, Department of Medicine, Stanford University, Palo Alto, California 94305
| | - Robert A Fenton
- From the Department of Biomedicine and Center for Interactions of Proteins in Epithelial Transport, Aarhus University, 8000 Aarhus, Denmark,
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84
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Gökirmak T, Denison FC, Laughner BJ, Paul AL, Ferl RJ. Phosphomimetic mutation of a conserved serine residue in Arabidopsis thaliana 14-3-3ω suggests a regulatory role of phosphorylation in dimerization and target interactions. PLANT PHYSIOLOGY AND BIOCHEMISTRY : PPB 2015; 97:296-303. [PMID: 26512969 DOI: 10.1016/j.plaphy.2015.10.022] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2015] [Revised: 10/14/2015] [Accepted: 10/16/2015] [Indexed: 06/05/2023]
Abstract
14-3-3s are evolutionarily conserved eukaryotic regulatory proteins that are involved in diverse biological processes. The common mode of action for the 14-3-3 proteins is through the binding of phosphorylated target proteins. In many species, multiple 14-3-3 isoforms exist and these different isoforms can exhibit distinct ranges of target interactions. The dimerization of 14-3-3s is central to their function. 14-3-3 isoforms can form different combinations of homo- and heterodimers, which contribute to the broad functional diversity of the family. In this study, we showed that phosphomimetic mutation of a conserved serine residue in the dimerization interface of 14-3-3 isoforms, Ser-62, not only affects the ability of Arabidopsis 14-3-3ω to form homodimers, but alters the range of 14-3-3 family members with which it can form heterodimers. Furthermore, we demonstrated that the phosphorylation status of Ser-62 can regulate the binding of 14-3-3ω to target proteins, suggesting that Ser-62 might be a conserved key element to modulate target binding in both plants and animals.
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Affiliation(s)
- Tufan Gökirmak
- Program in Plant Molecular and Cellular Biology, University of Florida, Gainesville, FL 32611, USA
| | - Fiona C Denison
- Department of Horticultural Sciences, University of Florida, Gainesville, FL 32611, USA
| | - Beth J Laughner
- Department of Horticultural Sciences, University of Florida, Gainesville, FL 32611, USA
| | - Anna-Lisa Paul
- Department of Horticultural Sciences, University of Florida, Gainesville, FL 32611, USA; Genetics Institute, University of Florida, Gainesville, FL 32611, USA
| | - Robert J Ferl
- Program in Plant Molecular and Cellular Biology, University of Florida, Gainesville, FL 32611, USA; Department of Horticultural Sciences, University of Florida, Gainesville, FL 32611, USA; Interdisciplinary Center for Biotechnology Research, University of Florida, Gainesville, FL 32611, USA.
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85
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Integrative proteome analysis of Brachypodium distachyon roots and leaves reveals a synergetic responsive network under H2O2 stress. J Proteomics 2015; 128:388-402. [PMID: 26344133 DOI: 10.1016/j.jprot.2015.08.020] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2015] [Revised: 08/18/2015] [Accepted: 08/26/2015] [Indexed: 02/07/2023]
Abstract
The plant oxidative stress response is vital for defense against various abiotic and biotic stresses. In this study, ultrastructural changes and the proteomic response to H2O2 stress in roots and leaves of the model plant Brachypodium distachyon were studied. Transmission electron microscopy (TEM) showed that the ultrastructural damage in roots was more serious than in leaves. Particularly, the ultrastructures of organelles and the nucleus in root tip cells were damaged, leading to the inhibition of normal biological activities of roots, which then spread throughout the plant. Based on two-dimensional electrophoresis (2-DE) and MALDI-TOF/TOF-MS, 84 and 53 differentially accumulated protein (DAP) spots representing 75 and 45 unique proteins responsive to H2O2 stress in roots and leaves, respectively, were identified. These protein species were mainly involved in signal transduction, energy metabolism, redox homeostasis/stress defense, protein folding/degradation, and cell wall/cell structure. Interestingly, two 14-3-3 proteins (GF14-B and GF14-D) were identified as DAPs in both roots and leaves. Protein-protein interaction (PPI) analysis revealed a synergetic H2O2-responsive network.
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86
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Wachi T, Cornell B, Marshall C, Zhukarev V, Baas PW, Toyo-oka K. Ablation of the 14-3-3gamma Protein Results in Neuronal Migration Delay and Morphological Defects in the Developing Cerebral Cortex. Dev Neurobiol 2015; 76:600-14. [PMID: 26297819 DOI: 10.1002/dneu.22335] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Revised: 07/18/2015] [Accepted: 08/18/2015] [Indexed: 11/10/2022]
Abstract
14-3-3 proteins are ubiquitously-expressed and multifunctional proteins. There are seven isoforms in mammals with a high level of homology, suggesting potential functional redundancy. We previously found that two of seven isoforms, 14-3-3epsilon and 14-3-3zeta, are important for brain development, in particular, radial migration of pyramidal neurons in the developing cerebral cortex. In this work, we analyzed the function of another isoform, the protein 14-3-3gamma, with respect to neuronal migration in the developing cortex. We found that in utero 14-3-3gamma-deficiency resulted in delays in neuronal migration as well as morphological defects. Migrating neurons deficient in 14-3-3gamma displayed a thicker leading process stem, and the basal ends of neurons were not able to reach the boundary between the cortical plate and the marginal zone. Consistent with the results obtained from in utero electroporation, time-lapse live imaging of brain slices revealed that the ablation of the 14-3-3gamma proteins in pyramidal neurons slowed down their migration. In addition, the 14-3-3gamma deficient neurons showed morphological abnormalities, including increased multipolar neurons with a thicker leading processes stem during migration. These results indicate that the 14-3-3gamma proteins play an important role in radial migration by regulating the morphology of migrating neurons in the cerebral cortex. The findings underscore the pathological phenotypes of brain development associated with the disruption of different 14-3-3 proteins and will advance the preclinical data regarding disorders caused by neuronal migration defects.
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Affiliation(s)
- Tomoka Wachi
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, Pennsylvania, 19129
| | - Brett Cornell
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, Pennsylvania, 19129
| | - Courtney Marshall
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, Pennsylvania, 19129
| | - Vladimir Zhukarev
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, Pennsylvania, 19129
| | - Peter W Baas
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, Pennsylvania, 19129
| | - Kazuhito Toyo-oka
- Department of Neurobiology and Anatomy, Drexel University College of Medicine, Philadelphia, Pennsylvania, 19129
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87
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Depletion of cardiac 14-3-3η protein adversely influences pathologic cardiac remodeling during myocardial infarction after coronary artery ligation in mice. Int J Cardiol 2015; 202:146-53. [PMID: 26386943 DOI: 10.1016/j.ijcard.2015.08.142] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/24/2015] [Revised: 08/15/2015] [Accepted: 08/19/2015] [Indexed: 11/21/2022]
Abstract
BACKGROUND/OBJECTIVES 14-3-3η protein, a dimeric phosphoserine-binding protein, provides protection against adverse cardiac remodeling during pressure-overload induced heart failure in mice. To identify its role in myocardial infarction (MI), we have used mice with cardio-specific expression of dominant-negative 14-3-3η protein mutant (DN14-3-3) and performed the surgical ligation of left anterior descending coronary artery. METHODS We have performed echocardiography to assess cardiac function, protein expression analysis using Western blotting, mRNA expression by real time-reverse transcription polymerase chain reaction and histopathological analyses. RESULTS DN14-3-3 mice with MI displayed reduced survival, left ventricular ejection fraction and fractional shortening. Interestingly, DN14-3-3 mice subjected to MI showed increased cardiac hypertrophy, inflammation, fibrosis and apoptosis as compared to their wild-type counterparts. Mechanistically, DN14-3-3 mice with MI exhibited activation of endoplasmic reticulum (ER) stress and markers of maladaptive cardiac remodeling. Cardiac regeneration marker expression also decreased drastically in the DN14-3-3 mice with MI. CONCLUSION Depletion of the 14-3-3η protein causes cardiac dysfunction and reduces survival in mice with MI, probably via exacerbation of ER stress and death signaling pathways and suppression of cardiac regeneration. Thus, identification of drugs that can modulate cardiac 14-3-3η protein levels may probably provide a novel protective therapy for heart failure.
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88
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Chemistry and biology of the compounds that modulate cell migration. J Ind Microbiol Biotechnol 2015; 43:213-9. [PMID: 26173498 DOI: 10.1007/s10295-015-1654-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2015] [Accepted: 07/02/2015] [Indexed: 12/21/2022]
Abstract
Cell migration is a fundamental step for embryonic development, wound repair, immune responses, and tumor cell invasion and metastasis. Extensive studies have attempted to reveal the molecular mechanisms behind cell migration; however, they remain largely unclear. Bioactive compounds that modulate cell migration show promise as not only extremely powerful tools for studying the mechanisms behind cell migration but also as drug seeds for chemotherapy against tumor metastasis. Therefore, we have screened cell migration inhibitors and analyzed their mechanisms for the inhibition of cell migration. In this mini-review, we introduce our chemical and biological studies of three cell migration inhibitors: moverastin, UTKO1, and BU-4664L.
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89
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Ganti K, Broniarczyk J, Manoubi W, Massimi P, Mittal S, Pim D, Szalmas A, Thatte J, Thomas M, Tomaić V, Banks L. The Human Papillomavirus E6 PDZ Binding Motif: From Life Cycle to Malignancy. Viruses 2015; 7:3530-51. [PMID: 26147797 PMCID: PMC4517114 DOI: 10.3390/v7072785] [Citation(s) in RCA: 90] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2015] [Revised: 06/24/2015] [Accepted: 06/25/2015] [Indexed: 01/01/2023] Open
Abstract
Cancer-causing HPV E6 oncoproteins are characterized by the presence of a PDZ binding motif (PBM) at their extreme carboxy terminus. It was long thought that this region of E6 had a sole function to confer interaction with a defined set of cellular substrates. However, more recent studies have shown that the E6 PBM has a complex pattern of regulation, whereby phosphorylation within the PBM can regulate interaction with two classes of cellular proteins: those containing PDZ domains and the members of the 14-3-3 family of proteins. In this review, we explore the roles that the PBM and its ligands play in the virus life cycle, and subsequently how these can inadvertently contribute towards the development of malignancy. We also explore how subtle alterations in cellular signal transduction pathways might result in aberrant E6 phosphorylation, which in turn might contribute towards disease progression.
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Affiliation(s)
- Ketaki Ganti
- International Center for Genetic Engineering and Biotechnology, Area Science Park, Padriciano 99, Trieste 34149, Italy.
| | - Justyna Broniarczyk
- International Center for Genetic Engineering and Biotechnology, Area Science Park, Padriciano 99, Trieste 34149, Italy.
| | - Wiem Manoubi
- International Center for Genetic Engineering and Biotechnology, Area Science Park, Padriciano 99, Trieste 34149, Italy.
| | - Paola Massimi
- International Center for Genetic Engineering and Biotechnology, Area Science Park, Padriciano 99, Trieste 34149, Italy.
| | - Suruchi Mittal
- International Center for Genetic Engineering and Biotechnology, Area Science Park, Padriciano 99, Trieste 34149, Italy.
| | - David Pim
- International Center for Genetic Engineering and Biotechnology, Area Science Park, Padriciano 99, Trieste 34149, Italy.
| | - Anita Szalmas
- International Center for Genetic Engineering and Biotechnology, Area Science Park, Padriciano 99, Trieste 34149, Italy.
| | - Jayashree Thatte
- International Center for Genetic Engineering and Biotechnology, Area Science Park, Padriciano 99, Trieste 34149, Italy.
| | - Miranda Thomas
- International Center for Genetic Engineering and Biotechnology, Area Science Park, Padriciano 99, Trieste 34149, Italy.
| | - Vjekoslav Tomaić
- International Center for Genetic Engineering and Biotechnology, Area Science Park, Padriciano 99, Trieste 34149, Italy.
| | - Lawrence Banks
- International Center for Genetic Engineering and Biotechnology, Area Science Park, Padriciano 99, Trieste 34149, Italy.
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90
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Feng X, Li Z, Du Y, Fu H, Klein JD, Cai H, Sands JM, Chen G. Downregulation of urea transporter UT-A1 activity by 14-3-3 protein. Am J Physiol Renal Physiol 2015; 309:F71-8. [PMID: 25995111 PMCID: PMC4490382 DOI: 10.1152/ajprenal.00546.2014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2014] [Accepted: 05/13/2015] [Indexed: 11/22/2022] Open
Abstract
Urea transporter (UT)-A1 in the kidney inner medulla plays a critical role in the urinary concentrating mechanism and thereby in the regulation of water balance. The 14-3-3 proteins are a family of seven isoforms. They are multifunctional regulatory proteins that mainly bind to phosphorylated serine/threonine residues in target proteins. In the present study, we found that all seven 14-3-3 isoforms were detected in the kidney inner medulla. However, only the 14-3-3 γ-isoform was specifically and highly associated with UT-A1, as demonstrated by a glutathione-S-transferase-14-3-3 pulldown assay. The cAMP/adenylyl cyclase stimulator forskolin significantly enhanced their binding. Coinjection of 14-3-3γ cRNA into oocytes resulted in a decrease of UT-A1 function. In addition, 14-3-3γ increased UT-A1 ubiquitination and protein degradation. 14-3-3γ can interact with both UT-A1 and mouse double minute 2, the E3 ubiquitin ligase for UT-A1. Thus, activation of cAMP/PKA increases 14-3-3γ interactions with UT-A1 and stimulates mouse double minute 2-mediated UT-A1 ubiquitination and degradation, thereby forming a novel regulatory mechanism of urea transport activity.
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Affiliation(s)
- Xiuyan Feng
- Renal Division, Department of Medicine, Emory University, School of Medicine, Atlanta, Georgia; Section of Nephrology, Atlanta Veterans Administration Medical Center, Decatur, Georgia
| | - Zenggang Li
- Department of Pharmacology, Emory University, School of Medicine, Atlanta, Georgia
| | - Yuhong Du
- Department of Pharmacology, Emory University, School of Medicine, Atlanta, Georgia
| | - Haian Fu
- Department of Pharmacology, Emory University, School of Medicine, Atlanta, Georgia
| | - Janet D Klein
- Renal Division, Department of Medicine, Emory University, School of Medicine, Atlanta, Georgia; Department of Physiology, Emory University, School of Medicine, Atlanta, Georgia; and
| | - Hui Cai
- Renal Division, Department of Medicine, Emory University, School of Medicine, Atlanta, Georgia; Department of Physiology, Emory University, School of Medicine, Atlanta, Georgia; and Section of Nephrology, Atlanta Veterans Administration Medical Center, Decatur, Georgia
| | - Jeff M Sands
- Renal Division, Department of Medicine, Emory University, School of Medicine, Atlanta, Georgia; Department of Physiology, Emory University, School of Medicine, Atlanta, Georgia; and
| | - Guangping Chen
- Renal Division, Department of Medicine, Emory University, School of Medicine, Atlanta, Georgia; Department of Physiology, Emory University, School of Medicine, Atlanta, Georgia; and
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91
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Phosphoregulatory protein 14-3-3 facilitates SAC1 transport from the endoplasmic reticulum. Proc Natl Acad Sci U S A 2015; 112:E3199-206. [PMID: 26056309 DOI: 10.1073/pnas.1509119112] [Citation(s) in RCA: 196] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Most secretory cargo proteins in eukaryotes are synthesized in the endoplasmic reticulum and actively exported in membrane-bound vesicles that are formed by the cytosolic coat protein complex II (COPII). COPII proteins are assisted by a variety of cargo-specific adaptor proteins required for the concentration and export of secretory proteins from the endoplasmic reticulum (ER). Adaptor proteins are key regulators of cargo export, and defects in their function may result in disease phenotypes in mammals. Here we report the role of 14-3-3 proteins as a cytosolic adaptor in mediating SAC1 transport in COPII-coated vesicles. Sac1 is a phosphatidyl inositol-4 phosphate (PI4P) lipid phosphatase that undergoes serum dependent translocation between the endoplasmic reticulum and Golgi complex and controls cellular PI4P lipid levels. We developed a cell-free COPII vesicle budding reaction to examine SAC1 exit from the ER that requires COPII and at least one additional cytosolic factor, the 14-3-3 protein. Recombinant 14-3-3 protein stimulates the packaging of SAC1 into COPII vesicles and the sorting subunit of COPII, Sec24, interacts with 14-3-3. We identified a minimal sorting motif of SAC1 that is important for 14-3-3 binding and which controls SAC1 export from the ER. This LS motif is part of a 7-aa stretch, RLSNTSP, which is similar to the consensus 14-3-3 binding sequence. Homology models, based on the SAC1 structure from yeast, predict this region to be in the exposed exterior of the protein. Our data suggest a model in which the 14-3-3 protein mediates SAC1 traffic from the ER through direct interaction with a sorting signal and COPII.
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92
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Killoran RC, Fan J, Yang D, Shilton BH, Choy WY. Structural Analysis of the 14-3-3ζ/Chibby Interaction Involved in Wnt/β-Catenin Signaling. PLoS One 2015; 10:e0123934. [PMID: 25909186 PMCID: PMC4409382 DOI: 10.1371/journal.pone.0123934] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2014] [Accepted: 03/09/2015] [Indexed: 12/26/2022] Open
Abstract
The partially disordered Chibby (Cby) is a conserved nuclear protein that antagonizes the Wnt/β-catenin signaling pathway. By competing with the Tcf/Lef family proteins for binding to β-catenin, Cby abrogates the β-catenin-mediated transcription of Wnt signaling genes. Additionally, upon phosphorylation on S20 by the kinase Akt, Cby forms a complex with 14-3-3 to facilitate the nuclear export of β-catenin, which represents another crucial mechanism for the regulation of Wnt signaling. To obtain a mechanistic understanding of the 14-3-3/Cby interaction, we have extensively characterized the complex using X-ray crystallography, nuclear magnetic resonance (NMR) spectroscopy, and isothermal titration calorimetry (ITC). The crystal structure of the human 14-3-3ζ/Cby protein-peptide complex reveals a canonical binding mode; however the residue at the +2 position from the phosphorylated serine is shown to be uniquely oriented relative to other solved structures of 14-3-3 complexes. Our ITC results illustrate that although the phosphorylation of S20 is essential for Cby to recognize 14-3-3, residues flanking the phosphorylation site also contribute to the binding affinity. However, as is commonly observed in other 14-3-3/phosphopeptide crystal structures, residues of Cby flanking the 14-3-3 binding motif lack observable electron density. To obtain a more detailed binding interface, we have completed the backbone NMR resonance assignment of 14-3-3ζ. NMR titration experiments reveal that residues outside of the 14-3-3 conserved binding cleft, namely a flexible loop consisting of residues 203-210, are also involved in binding Cby. By using a combined X-ray and NMR approach, we have dissected the molecular basis of the 14-3-3/Cby interaction.
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Affiliation(s)
- Ryan C Killoran
- Department of Biochemistry, The University of Western Ontario, London, Ontario N6A 5C1, Canada
| | - Jingsong Fan
- Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore, 117543, Singapore
| | - Daiwen Yang
- Department of Biological Sciences, National University of Singapore, 14 Science Drive 4, Singapore, 117543, Singapore
| | - Brian H Shilton
- Department of Biochemistry, The University of Western Ontario, London, Ontario N6A 5C1, Canada
| | - Wing-Yiu Choy
- Department of Biochemistry, The University of Western Ontario, London, Ontario N6A 5C1, Canada
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93
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Herhaus L, Perez-Oliva AB, Cozza G, Gourlay R, Weidlich S, Campbell DG, Pinna LA, Sapkota GP. Casein kinase 2 (CK2) phosphorylates the deubiquitylase OTUB1 at Ser16 to trigger its nuclear localization. Sci Signal 2015; 8:ra35. [PMID: 25872870 PMCID: PMC4421874 DOI: 10.1126/scisignal.aaa0441] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The deubiquitylating enzyme OTUB1 is present in all tissues and targets many substrates, in both the cytosol and nucleus. We found that casein kinase 2 (CK2) phosphorylated OTUB1 at Ser(16) to promote its nuclear accumulation in cells. Pharmacological inhibition or genetic ablation of CK2 blocked the phosphorylation of OTUB1 at Ser(16), causing its nuclear exclusion in various cell types. Whereas we detected unphosphorylated OTUB1 mainly in the cytosol, we detected Ser(16)-phosphorylated OTUB1 only in the nucleus. In vitro, Ser(16)-phosphorylated OTUB1 and nonphosphorylated OTUB1 exhibited similar catalytic activity, bound K63-linked ubiquitin chains, and interacted with the E2 enzyme UBE2N. CK2-mediated phosphorylation and subsequent nuclear localization of OTUB1 promoted the formation of 53BP1 (p53-binding protein 1) DNA repair foci in the nucleus of osteosarcoma cells exposed to ionizing radiation. Our findings indicate that the activity of CK2 is necessary for the nuclear translocation and subsequent function of OTUB1 in DNA damage repair.
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MESH Headings
- Active Transport, Cell Nucleus/drug effects
- Active Transport, Cell Nucleus/genetics
- Animals
- Casein Kinase II/antagonists & inhibitors
- Casein Kinase II/genetics
- Casein Kinase II/metabolism
- Cell Line, Tumor
- Cell Nucleus/metabolism
- Cells, Cultured
- Cysteine Endopeptidases/genetics
- Cysteine Endopeptidases/metabolism
- Deubiquitinating Enzymes
- Embryo, Mammalian/cytology
- Fibroblasts/cytology
- Fibroblasts/drug effects
- Fibroblasts/metabolism
- HEK293 Cells
- HeLa Cells
- Humans
- Immunoblotting
- Lysine/genetics
- Lysine/metabolism
- Mice, Knockout
- Microscopy, Fluorescence
- Mutation
- Phosphorylation/drug effects
- Protein Binding
- Protein Kinase Inhibitors/pharmacology
- Protein Serine-Threonine Kinases/genetics
- Protein Serine-Threonine Kinases/metabolism
- RNA Interference
- Receptor, Transforming Growth Factor-beta Type I
- Receptors, Transforming Growth Factor beta/genetics
- Receptors, Transforming Growth Factor beta/metabolism
- Serine/genetics
- Serine/metabolism
- Transforming Growth Factor beta/pharmacology
- Ubiquitin-Conjugating Enzymes/genetics
- Ubiquitin-Conjugating Enzymes/metabolism
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Affiliation(s)
- Lina Herhaus
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, UK
| | - Ana B Perez-Oliva
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, UK
| | - Giorgio Cozza
- Department of Biomedical Sciences and CNR Institute of Neurosciences, University of Padova, via Ugo Bassi 58/B, 35131 Padova, Italy
| | - Robert Gourlay
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, UK
| | - Simone Weidlich
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, UK
| | - David G Campbell
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, UK
| | - Lorenzo A Pinna
- Department of Biomedical Sciences and CNR Institute of Neurosciences, University of Padova, via Ugo Bassi 58/B, 35131 Padova, Italy
| | - Gopal P Sapkota
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, UK.
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94
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Teichmann A, Vargas DM, Monteiro KM, Meneghetti BV, Dutra CS, Paredes R, Galanti N, Zaha A, Ferreira HB. Characterization of 14-3-3 Isoforms Expressed in the Echinococcus granulosus Pathogenic Larval Stage. J Proteome Res 2015; 14:1700-15. [DOI: 10.1021/pr5010136] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Aline Teichmann
- Laboratório
de Genômica Estrutural e Funcional and Laboratório de
Biologia Molecular de Cestódeos, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), 91501-970 Porto
Alegre, RS, Brazil
| | - Daiani M. Vargas
- Laboratório
de Genômica Estrutural e Funcional and Laboratório de
Biologia Molecular de Cestódeos, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), 91501-970 Porto
Alegre, RS, Brazil
| | - Karina M. Monteiro
- Laboratório
de Genômica Estrutural e Funcional and Laboratório de
Biologia Molecular de Cestódeos, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), 91501-970 Porto
Alegre, RS, Brazil
| | - Bruna V. Meneghetti
- Laboratório
de Genômica Estrutural e Funcional and Laboratório de
Biologia Molecular de Cestódeos, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), 91501-970 Porto
Alegre, RS, Brazil
| | - Cristine S. Dutra
- Laboratório
de Genômica Estrutural e Funcional and Laboratório de
Biologia Molecular de Cestódeos, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), 91501-970 Porto
Alegre, RS, Brazil
| | - Rodolfo Paredes
- Escuela
de Medicina Veterinaria, Facultad de Ecologia y Recursos Naturales, Universidad Andrés Bello, 8370251 Santiago, Chile
| | - Norbel Galanti
- Programa
de Biología Celular y Molecular, Instituto de Ciencias Biomédicas,
Facultad de Medicina, Universidad de Chile, 8389100 Santiago, Chile
| | - Arnaldo Zaha
- Laboratório
de Genômica Estrutural e Funcional and Laboratório de
Biologia Molecular de Cestódeos, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), 91501-970 Porto
Alegre, RS, Brazil
| | - Henrique B. Ferreira
- Laboratório
de Genômica Estrutural e Funcional and Laboratório de
Biologia Molecular de Cestódeos, Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul (UFRGS), 91501-970 Porto
Alegre, RS, Brazil
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95
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Sluchanko NN, Uversky VN. Hidden disorder propensity of the N-terminal segment of universal adapter protein 14-3-3 is manifested in its monomeric form: Novel insights into protein dimerization and multifunctionality. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2015; 1854:492-504. [PMID: 25747569 DOI: 10.1016/j.bbapap.2015.02.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2015] [Revised: 02/17/2015] [Accepted: 02/24/2015] [Indexed: 11/30/2022]
Abstract
The multiplicity of functions of 14-3-3 proteins, integrated into many cellular interactions and signaling networks, is primarily based upon their dimeric α-helical structure that is capable of binding phosphorylated protein partners as well as displaying a "moonlighting" chaperone-like activity. The structure and functions of 14-3-3 proteins are regulated in different ways, including Ser58 phosphorylation in the interface, which shifts equilibrium towards the formation of protein monomers whose role is poorly understood. While modification of Ser58 induced only partial dissociation, the engineered triple mutation of human 14-3-3ζ located in the first α-helix deeply monomerized the protein, allowing for a structural analysis of the monomeric form. Dimer-incapable 14-3-3 proteins retained binding capacity and specificity towards some phosphopartners, and also demonstrated increased chaperone-like activity on various substrates. Here, we found a substantial propensity of the N-terminal segment (~40 residues) of 14-3-3 proteins to intrinsic disorder, showing remarkable conservation across different isoforms and organisms. We hypothesized that this intrinsic disorder propensity, hidden in the α-helical 14-3-3 dimer, can be manifested upon its dissociation and interrogated novel monomeric 14-3-3ζ carrying both monomerizing and S58E mutations (14-3-3ζmS58E). CD spectroscopy showed that, at physiological temperatures, this protein has ~10-15% reduced helicity relative to the wild type protein, corresponding to roughly 40 residues. Along with the known flexibility of C-terminus, SAXS-based modeling of the 14-3-3ζmS58E structure strongly suggested pliability of its N-terminus. The unraveled disorder propensity of the N-terminal tails of 14-3-3 proteins provides new clues for better understanding of the molecular mechanisms of dimerization and multifunctionality of these universal adapter proteins.
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Affiliation(s)
- Nikolai N Sluchanko
- A. N. Bach Institute of Biochemistry, Russian Academy of Sciences, Leninsky prospect 33, Moscow 119071, Russian Federation.
| | - Vladimir N Uversky
- Department of Molecular Medicine and USF Health Byrd Alzheimer's Research Institute, Morsani College of Medicine, University of South Florida, Tampa, FL, USA; Institute for Biological Instrumentation, Russian Academy of Sciences, Pushchino, Moscow Region, Russian Federation; Biology Department, Faculty of Science, King Abdulaziz University, P.O. Box 80203, Jeddah 21589, Saudi Arabia; Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russian Federation.
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96
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Madeira F, Tinti M, Murugesan G, Berrett E, Stafford M, Toth R, Cole C, MacKintosh C, Barton GJ. 14-3-3-Pred: improved methods to predict 14-3-3-binding phosphopeptides. Bioinformatics 2015; 31:2276-83. [PMID: 25735772 PMCID: PMC4495292 DOI: 10.1093/bioinformatics/btv133] [Citation(s) in RCA: 149] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2014] [Accepted: 02/25/2015] [Indexed: 01/19/2023] Open
Abstract
MOTIVATION The 14-3-3 family of phosphoprotein-binding proteins regulates many cellular processes by docking onto pairs of phosphorylated Ser and Thr residues in a constellation of intracellular targets. Therefore, there is a pressing need to develop new prediction methods that use an updated set of 14-3-3-binding motifs for the identification of new 14-3-3 targets and to prioritize the downstream analysis of >2000 potential interactors identified in high-throughput experiments. RESULTS Here, a comprehensive set of 14-3-3-binding targets from the literature was used to develop 14-3-3-binding phosphosite predictors. Position-specific scoring matrix, support vector machines (SVM) and artificial neural network (ANN) classification methods were trained to discriminate experimentally determined 14-3-3-binding motifs from non-binding phosphopeptides. ANN, position-specific scoring matrix and SVM methods showed best performance for a motif window spanning from -6 to +4 around the binding phosphosite, achieving Matthews correlation coefficient of up to 0.60. Blind prediction showed that all three methods outperform two popular 14-3-3-binding site predictors, Scansite and ELM. The new methods were used for prediction of 14-3-3-binding phosphosites in the human proteome. Experimental analysis of high-scoring predictions in the FAM122A and FAM122B proteins confirms the predictions and suggests the new 14-3-3-predictors will be generally useful. AVAILABILITY AND IMPLEMENTATION A standalone prediction web server is available at http://www.compbio.dundee.ac.uk/1433pred. Human candidate 14-3-3-binding phosphosites were integrated in ANIA: ANnotation and Integrated Analysis of the 14-3-3 interactome database.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Geoffrey J Barton
- Division of Computational Biology, Division of Biological Chemistry and Drug Discovery, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, UK
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Inoue M, Okamoto K, Uemura H, Yasuda K, Motohara Y, Morita K, Hiromura M, Reddy EP, Fukuma T, Horikoshi N. Identification and characterization of a cell division-regulating kinase AKB1 (associated kinase of Trypanosoma brucei 14-3-3) through proteomics study of the Tb14-3-3 binding proteins. ACTA ACUST UNITED AC 2015; 158:49-60. [DOI: 10.1093/jb/mvv018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 01/12/2015] [Indexed: 11/13/2022]
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98
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Small molecules, peptides and natural products: getting a grip on 14-3-3 protein-protein modulation. Future Med Chem 2015; 6:903-21. [PMID: 24962282 DOI: 10.4155/fmc.14.47] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
One of the proteins that is found in a diverse range of eukaryotic protein-protein interactions is the adaptor protein 14-3-3. As 14-3-3 is a hub protein with very diverse interactions, it is a good model to study various protein-protein interactions. A wide range of classes of molecules, peptides, small molecules or natural products, has been used to modify the protein interactions, providing both stabilization or inhibition of the interactions of 14-3-3 with its binding partners. The first protein crystal structures were solved in 1995 and gave molecular insights for further research. The plant analog of 14-3-3 binds to a plant plasma membrane H(+)-ATPase and this protein complex is stabilized by the fungal phytotoxin fusicoccin A. The knowledge gained from the process in plants was transferred to and applied in human models to find stabilizers or inhibitors of 14-3-3 interaction in human cellular pathways.
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99
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Li Z, Park HR, Shi Z, Li Z, Pham CD, Du Y, Khuri FR, Zhang Y, Han Q, Fu H. Pro-oncogenic function of HIP-55/Drebrin-like (DBNL) through Ser269/Thr291-phospho-sensor motifs. Oncotarget 2015; 5:3197-209. [PMID: 24912570 PMCID: PMC4102803 DOI: 10.18632/oncotarget.1900] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
HIP-55 (HPK1-interacting protein of 55 kDa, also named DBNL, SH3P7, and mAbp1) is a multidomain adaptor protein that is critical for organ development and the immune response. Here, we report the coupling of HIP-55 to cell growth control through its 14-3-3-binding phospho-Ser/Thr-sensor sites. Using affinity chromatography, we found HIP-55 formed a complex with 14-3-3 proteins, revealing a new node in phospho-Ser/Thr-mediated signaling networks. In addition, we demonstrated that HIP-55 is required for proper cell growth control. Enforced HIP-55 expression promoted proliferation, colony formation, migration, and invasion of lung cancer cells while silencing of HIP-55 reversed these effects. Importantly, HIP-55 was found to be upregulated in lung cancer cell lines and in tumor tissues of lung cancer patients. Upregulated HIP-55 was required to promote the growth of tumors in a xenograft animal model. However, tumors with S269A/T291A-mutated HIP-55, which ablates 14-3-3 binding, exhibited significantly reduced sizes, supporting a vital role of the HIP-55/14-3-3 protein interaction node in transmitting oncogenic signals. Mechanistically, HIP-55-mediated tumorigenesis activity appears to be in part mediated by antagonizing the tumor suppressor function of HPK1. Thus, the HIP-55–mediated oncogenic pathway, through S269/T291, may be exploited for the development of new therapeutic strategies.
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Affiliation(s)
- Zijian Li
- Department of Pharmacology, Emory University School of Medicine, Atlanta, GA, 30322, USA
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100
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Chi JC, Roeper J, Schwarz G, Fischer-Schrader K. Dual binding of 14-3-3 protein regulates Arabidopsis nitrate reductase activity. J Biol Inorg Chem 2015; 20:277-86. [PMID: 25578809 DOI: 10.1007/s00775-014-1232-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2014] [Accepted: 12/11/2014] [Indexed: 01/02/2023]
Abstract
14-3-3 proteins represent a family of ubiquitous eukaryotic proteins involved in numerous signal transduction processes and metabolic pathways. One important 14-3-3 target in higher plants is nitrate reductase (NR), whose activity is regulated by different physiological conditions. Intra-molecular electron transfer in NR is inhibited following 14-3-3 binding to a conserved phospho-serine motif located in hinge 1, a surface exposed loop between the catalytic molybdenum and central heme domain. Here we describe a novel 14-3-3 binding site within the NR N-terminus, an acidic motif conserved in NRs of higher plants, which significantly contributes to 14-3-3-mediated inhibition of NR. Deletion or mutation of the N-terminal acidic motif resulted in a significant loss of 14-3-3 mediated inhibition of Ser534 phosphorylated NR-Mo-heme (residues 1-625), a previously established model of NR regulation. Co-sedimentation and crosslinking studies with NR peptides comprising each of the two binding motifs demonstrated direct binding of either peptide to 14-3-3. Surface plasmon resonance spectroscopy disclosed high-affinity binding of 14-3-3ω to the well-known phospho-hinge site and low-affinity binding to the N-terminal acidic motif. A binding groove-deficient 14-3-3ω variant retained interaction to the acidic motif, but lost binding to the phospho-hinge motif. To our knowledge, NR is the first enzyme that harbors two independent 14-3-3 binding sites with different affinities, which both need to be occupied by 14-3-3ω to confer full inhibition of NR activity under physiological conditions.
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Affiliation(s)
- Jen-Chih Chi
- Department of Chemistry, Institute for Biochemistry, University of Cologne, 50674, Cologne, Germany
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