1
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Honrubia JM, Valverde JR, Muñoz-Santos D, Ripoll-Gómez J, de la Blanca N, Izquierdo J, Villarejo-Torres M, Marchena-Pasero A, Rueda-Huélamo M, Nombela I, Ruiz-Yuste M, Zuñiga S, Sola I, Enjuanes L. Interaction between SARS-CoV PBM and Cellular PDZ Domains Leading to Virus Virulence. Viruses 2024; 16:1214. [PMID: 39205188 PMCID: PMC11359647 DOI: 10.3390/v16081214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2024] [Revised: 07/19/2024] [Accepted: 07/26/2024] [Indexed: 09/04/2024] Open
Abstract
The interaction between SARS-CoV PDZ-binding motifs (PBMs) and cellular PDZs is responsible for virus virulence. The PBM sequence present in the 3a and envelope (E) proteins of SARS-CoV can potentially bind to over 400 cellular proteins containing PDZ domains. The role of SARS-CoV 3a and E proteins was studied. SARS-CoVs, in which 3a-PBM and E-PMB have been deleted (3a-PBM-/E-PBM-), reduced their titer around one logarithmic unit but still were viable. In addition, the absence of the E-PBM and the replacement of 3a-PBM with that of E did not allow the rescue of SARS-CoV. E protein PBM was necessary for virulence, activating p38-MAPK through the interaction with Syntenin-1 PDZ domain. However, the presence or absence of the homologous motif in the 3a protein, which does not bind to Syntenin-1, did not affect virus pathogenicity. Mutagenesis analysis and in silico modeling were performed to study the extension of the PBM of the SARS-CoV E protein. Alanine and glycine scanning was performed revealing a pair of amino acids necessary for optimum virus replication. The binding of E protein with the PDZ2 domain of the Syntenin-1 homodimer induced conformational changes in both PDZ domains 1 and 2 of the dimer.
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Affiliation(s)
- Jose M. Honrubia
- Department of Molecular and Cell Biology, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Jose R. Valverde
- Scientific Computing Service, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Diego Muñoz-Santos
- Department of Molecular and Cell Biology, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Jorge Ripoll-Gómez
- Department of Molecular and Cell Biology, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Nuria de la Blanca
- Scientific Computing Service, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Jorge Izquierdo
- Scientific Computing Service, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Marta Villarejo-Torres
- Department of Molecular and Cell Biology, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Ana Marchena-Pasero
- Department of Molecular and Cell Biology, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - María Rueda-Huélamo
- Department of Molecular and Cell Biology, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Ivan Nombela
- Department of Molecular and Cell Biology, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Mercedes Ruiz-Yuste
- Department of Molecular and Cell Biology, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Sonia Zuñiga
- Department of Molecular and Cell Biology, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Isabel Sola
- Department of Molecular and Cell Biology, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
| | - Luis Enjuanes
- Department of Molecular and Cell Biology, Centro Nacional de Biotecnología (CNB-CSIC), Darwin 3, Campus Universidad Autónoma de Madrid, 28049 Madrid, Spain
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2
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Blake ME, Kleinpeter AB, Jureka AS, Petit CM. Structural Investigations of Interactions between the Influenza a Virus NS1 and Host Cellular Proteins. Viruses 2023; 15:2063. [PMID: 37896840 PMCID: PMC10612106 DOI: 10.3390/v15102063] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 09/26/2023] [Accepted: 09/28/2023] [Indexed: 10/29/2023] Open
Abstract
The Influenza A virus is a continuous threat to public health that causes yearly epidemics with the ever-present threat of the virus becoming the next pandemic. Due to increasing levels of resistance, several of our previously used antivirals have been rendered useless. There is a strong need for new antivirals that are less likely to be susceptible to mutations. One strategy to achieve this goal is structure-based drug development. By understanding the minute details of protein structure, we can develop antivirals that target the most conserved, crucial regions to yield the highest chances of long-lasting success. One promising IAV target is the virulence protein non-structural protein 1 (NS1). NS1 contributes to pathogenicity through interactions with numerous host proteins, and many of the resulting complexes have been shown to be crucial for virulence. In this review, we cover the NS1-host protein complexes that have been structurally characterized to date. By bringing these structures together in one place, we aim to highlight the strength of this field for drug discovery along with the gaps that remain to be filled.
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Affiliation(s)
| | | | | | - Chad M. Petit
- Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Birmingham, AL 35294, USA; (M.E.B.)
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3
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Singh AK, Dadey DY, Rau MJ, Fitzpatrick J, Shah HK, Saikia M, Townsend R, Thotala D, Hallahan DE, Kapoor V. Blocking the functional domain of TIP1 by antibodies sensitizes cancer to radiation therapy. Biomed Pharmacother 2023; 166:115341. [PMID: 37625322 DOI: 10.1016/j.biopha.2023.115341] [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] [Received: 06/25/2023] [Revised: 08/11/2023] [Accepted: 08/19/2023] [Indexed: 08/27/2023] Open
Abstract
Non-small-cell lung cancer (NSCLC) and glioblastoma (GB) have poor prognoses. Discovery of new molecular targets is needed to improve therapy. Tax interacting protein 1 (TIP1), which plays a role in cancer progression, is overexpressed and radiation-inducible in NSCLC and GB. We evaluated the effect of an anti-TIP1 antibody alone and in combination with ionizing radiation (XRT) on NSCLC and GB in vitro and in vivo. NSCLC and GB cells were treated with anti-TIP1 antibodies and evaluated for proliferation, colony formation, endocytosis, and cell death. The efficacy of anti-TIP1 antibodies in combination with XRT on tumor growth was measured in mouse models of NSCLC and GB. mRNA sequencing was performed to understand the molecular mechanisms involved in the action of anti-TIP1 antibodies. We found that targeting the functional domain of TIP1 leads to endocytosis of the anti-TIP1 antibody followed by reduced proliferation and increased apoptosis-mediated cell death. Anti-TIP1 antibodies bound specifically (with high affinity) to cancer cells and synergized with XRT to significantly increase cytotoxicity in vitro and reduce tumor growth in mouse models of NSCLC and GB. Importantly, downregulation of cancer survival signaling pathways was found in vitro and in vivo following treatment with anti-TIP1 antibodies. TIP1 is a new therapeutic target for cancer treatment. Antibodies targeting the functional domain of TIP1 exhibited antitumor activity and enhanced the efficacy of radiation both in vitro and in vivo. Anti-TIP1 antibodies interrupt TIP1 function and are effective cancer therapy alone or in combination with XRT in mouse models of human cancer.
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Affiliation(s)
- Abhay K Singh
- Department of Radiation Oncology, Washington University School of Medicine in St. Louis, St. Louis, MO, USA
| | - David Ya Dadey
- Department of Radiation Oncology, Washington University School of Medicine in St. Louis, St. Louis, MO, USA; Department of Neurosurgery, Stanford University School of Medicine, Stanford, CA, USA
| | - Michael J Rau
- Center for Cellular Imaging, Washington University School of Medicine in St. Louis, St. Louis, MO, USA
| | - James Fitzpatrick
- Center for Cellular Imaging, Washington University School of Medicine in St. Louis, St. Louis, MO, USA; Departments of Cell Biology & Physiology and Neuroscience, Washington University School of Medicine, St. Louis, MO, USA; Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO,USA
| | - Harendra K Shah
- Department of Radiation Oncology, Washington University School of Medicine in St. Louis, St. Louis, MO, USA
| | - Minakshi Saikia
- Department of Radiation Oncology, Washington University School of Medicine in St. Louis, St. Louis, MO, USA
| | - Reid Townsend
- Department of Medicine, Washington University in St. Louis, St. Louis, MO,USA; Siteman Cancer Center, St. Louis, MO, USA
| | - Dinesh Thotala
- Department of Radiation Oncology, Washington University School of Medicine in St. Louis, St. Louis, MO, USA; Siteman Cancer Center, St. Louis, MO, USA
| | - Dennis E Hallahan
- Department of Radiation Oncology, Washington University School of Medicine in St. Louis, St. Louis, MO, USA; Siteman Cancer Center, St. Louis, MO, USA.
| | - Vaishali Kapoor
- Department of Radiation Oncology, Washington University School of Medicine in St. Louis, St. Louis, MO, USA; Siteman Cancer Center, St. Louis, MO, USA.
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4
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Jurásek M, Kumar J, Paclíková P, Kumari A, Tripsianes K, Bryja V, Vácha R. Phosphorylation-induced changes in the PDZ domain of Dishevelled 3. Sci Rep 2021; 11:1484. [PMID: 33452274 PMCID: PMC7810883 DOI: 10.1038/s41598-020-79398-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Accepted: 12/04/2020] [Indexed: 01/29/2023] Open
Abstract
The PDZ domain of Dishevelled 3 protein belongs to a highly abundant protein recognition motif which typically binds short C-terminal peptides. The affinity of the PDZ towards the peptides could be fine-tuned by a variety of post-translation modifications including phosphorylation. However, how phosphorylations affect the PDZ structure and its interactions with ligands remains elusive. Combining molecular dynamics simulations, NMR titration, and biological experiments, we explored the role of previously reported phosphorylation sites and their mimetics in the Dishevelled PDZ domain. Our observations suggest three major roles for phosphorylations: (1) acting as an on/off PDZ binding switch, (2) allosterically affecting the binding groove, and (3) influencing the secondary binding site. Our simulations indicated that mimetics had similar but weaker effects, and the effects of distinct sites were non-additive. This study provides insight into the Dishevelled regulation by PDZ phosphorylation. Furthermore, the observed effects could be used to elucidate the regulation mechanisms in other PDZ domains.
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Affiliation(s)
- Miroslav Jurásek
- National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 753/5, 625 00, Brno, Czech Republic
| | - Jitender Kumar
- CEITEC - Central European Institute of Technology, Masaryk University, Kamenice 753/5, 625 00, Brno, Czech Republic
| | - Petra Paclíková
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic
| | - Alka Kumari
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic
| | - Konstantinos Tripsianes
- CEITEC - Central European Institute of Technology, Masaryk University, Kamenice 753/5, 625 00, Brno, Czech Republic
| | - Vítězslav Bryja
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic
- Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Brno, 612 65, Czech Republic
| | - Robert Vácha
- National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Kamenice 753/5, 625 00, Brno, Czech Republic.
- CEITEC - Central European Institute of Technology, Masaryk University, Kamenice 753/5, 625 00, Brno, Czech Republic.
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5
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Amacher JF, Brooks L, Hampton TH, Madden DR. Specificity in PDZ-peptide interaction networks: Computational analysis and review. JOURNAL OF STRUCTURAL BIOLOGY-X 2020; 4:100022. [PMID: 32289118 PMCID: PMC7138185 DOI: 10.1016/j.yjsbx.2020.100022] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 02/26/2020] [Accepted: 02/29/2020] [Indexed: 01/03/2023]
Abstract
Globular PDZ domains typically serve as protein-protein interaction modules that regulate a wide variety of cellular functions via recognition of short linear motifs (SLiMs). Often, PDZ mediated-interactions are essential components of macromolecular complexes, and disruption affects the entire scaffold. Due to their roles as linchpins in trafficking and signaling pathways, PDZ domains are attractive targets: both for controlling viral pathogens, which bind PDZ domains and hijack cellular machinery, as well as for developing therapies to combat human disease. However, successful therapeutic interventions that avoid off-target effects are a challenge, because each PDZ domain interacts with a number of cellular targets, and specific binding preferences can be difficult to decipher. Over twenty-five years of research has produced a wealth of data on the stereochemical preferences of individual PDZ proteins and their binding partners. Currently the field lacks a central repository for this information. Here, we provide this important resource and provide a manually curated, comprehensive list of the 271 human PDZ domains. We use individual domain, as well as recent genomic and proteomic, data in order to gain a holistic view of PDZ domains and interaction networks, arguing this knowledge is critical to optimize targeting selectivity and to benefit human health.
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Affiliation(s)
- Jeanine F Amacher
- Department of Biochemistry and Cell Biology, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA.,Department of Chemistry, Western Washington University, Bellingham, WA 98225, USA
| | - Lionel Brooks
- Department of Biology, Western Washington University, Bellingham, WA 98225, USA
| | - Thomas H Hampton
- Department of Microbiology and Immunology, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
| | - Dean R Madden
- Department of Biochemistry and Cell Biology, Geisel School of Medicine at Dartmouth, Hanover, NH 03755, USA
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6
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Harnoš J, Cañizal MCA, Jurásek M, Kumar J, Holler C, Schambony A, Hanáková K, Bernatík O, Zdráhal Z, Gömöryová K, Gybeľ T, Radaszkiewicz TW, Kravec M, Trantírek L, Ryneš J, Dave Z, Fernández-Llamazares AI, Vácha R, Tripsianes K, Hoffmann C, Bryja V. Dishevelled-3 conformation dynamics analyzed by FRET-based biosensors reveals a key role of casein kinase 1. Nat Commun 2019; 10:1804. [PMID: 31000703 PMCID: PMC6472409 DOI: 10.1038/s41467-019-09651-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 03/20/2019] [Indexed: 01/17/2023] Open
Abstract
Dishevelled (DVL) is the key component of the Wnt signaling pathway. Currently, DVL conformational dynamics under native conditions is unknown. To overcome this limitation, we develop the Fluorescein Arsenical Hairpin Binder- (FlAsH-) based FRET in vivo approach to study DVL conformation in living cells. Using this single-cell FRET approach, we demonstrate that (i) Wnt ligands induce open DVL conformation, (ii) DVL variants that are predominantly open, show more even subcellular localization and more efficient membrane recruitment by Frizzled (FZD) and (iii) Casein kinase 1 ɛ (CK1ɛ) has a key regulatory function in DVL conformational dynamics. In silico modeling and in vitro biophysical methods explain how CK1ɛ-specific phosphorylation events control DVL conformations via modulation of the PDZ domain and its interaction with DVL C-terminus. In summary, our study describes an experimental tool for DVL conformational sampling in living cells and elucidates the essential regulatory role of CK1ɛ in DVL conformational dynamics.
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Affiliation(s)
- Jakub Harnoš
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic.,Department of Cell, Developmental & Regenerative Biology, Icahn School of Medicine at Mount Sinai, New York, NY, 10029, USA
| | - Maria Consuelo Alonso Cañizal
- Department of Pharmacology and Toxicology, University of Würzburg, Würzburg, 97078, Germany.,Rudolf Virchow Center for Experimental Biomedicine, University of Würzburg, Würzburg, 97078, Germany.,Institute for Molecular Cell Biology, CMB-Center for Molecular Biomedicine, University Hospital Jena, Friedrich Schiller University Jena, Jena, 07745, Germany
| | - Miroslav Jurásek
- CEITEC-Central European Institute of Technology, Masaryk University, Brno, 62500, Czech Republic.,National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic
| | - Jitender Kumar
- CEITEC-Central European Institute of Technology, Masaryk University, Brno, 62500, Czech Republic
| | - Cornelia Holler
- Max Planck Institute for the Science of Light, Erlangen, 91058, Germany.,Biology Department, Developmental Biology, Friedrich-Alexander University Erlangen-Nüremberg, Erlangen, 91058, Germany
| | - Alexandra Schambony
- Max Planck Institute for the Science of Light, Erlangen, 91058, Germany.,Biology Department, Developmental Biology, Friedrich-Alexander University Erlangen-Nüremberg, Erlangen, 91058, Germany
| | - Kateřina Hanáková
- CEITEC-Central European Institute of Technology, Masaryk University, Brno, 62500, Czech Republic.,National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic
| | - Ondřej Bernatík
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic
| | - Zbyněk Zdráhal
- CEITEC-Central European Institute of Technology, Masaryk University, Brno, 62500, Czech Republic.,National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic
| | - Kristína Gömöryová
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic
| | - Tomáš Gybeľ
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic
| | | | - Marek Kravec
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic
| | - Lukáš Trantírek
- CEITEC-Central European Institute of Technology, Masaryk University, Brno, 62500, Czech Republic.,Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Brno, 612 65, Czech Republic
| | - Jan Ryneš
- CEITEC-Central European Institute of Technology, Masaryk University, Brno, 62500, Czech Republic
| | - Zankruti Dave
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic
| | | | - Robert Vácha
- CEITEC-Central European Institute of Technology, Masaryk University, Brno, 62500, Czech Republic.,National Centre for Biomolecular Research, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic
| | - Konstantinos Tripsianes
- CEITEC-Central European Institute of Technology, Masaryk University, Brno, 62500, Czech Republic
| | - Carsten Hoffmann
- Department of Pharmacology and Toxicology, University of Würzburg, Würzburg, 97078, Germany.,Rudolf Virchow Center for Experimental Biomedicine, University of Würzburg, Würzburg, 97078, Germany.,Institute for Molecular Cell Biology, CMB-Center for Molecular Biomedicine, University Hospital Jena, Friedrich Schiller University Jena, Jena, 07745, Germany
| | - Vítězslav Bryja
- Department of Experimental Biology, Faculty of Science, Masaryk University, Brno, 62500, Czech Republic. .,Institute of Biophysics, Academy of Sciences of the Czech Republic, v.v.i., Brno, 612 65, Czech Republic.
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7
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Yan H, Kapoor V, Nguyen K, Akers WJ, Li H, Scott J, Laforest R, Rogers B, Thotala D, Hallahan D. Anti-tax interacting protein-1 (TIP-1) monoclonal antibody targets human cancers. Oncotarget 2017; 7:43352-43362. [PMID: 27270318 PMCID: PMC5190028 DOI: 10.18632/oncotarget.9713] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Accepted: 05/13/2016] [Indexed: 02/04/2023] Open
Abstract
Radiation-inducible neo-antigens are proteins expressed on cancer cell surface after exposure to ionizing radiation (IR). These neo-antigens provide opportunities to specifically target cancers while sparing normal tissues. Tax interacting protein-1 (TIP-1) is induced by irradiation and is translocated to the surface of cancer cells. We have developed a monoclonal antibody, 2C6F3, against TIP-1. Epitope mapping revealed that 2C6F3 binds to the QPVTAVVQRV epitope of the TIP-1 protein. 2C6F3 binds to the surface of lung cancer (A549, LLC) and glioma (D54, GL261) cell lines. 2C6F3 binds specifically to TIP-1 and ELISA analysis showed that unconjugated 2C6F3 efficiently blocked binding of radiolabeled 2C6F3 to purified TIP-1 protein. To study in vivo tumor binding, we injected near infrared (NIR) fluorochrome-conjugated 2C6F3 via tail vein in mice bearing subcutaneous LLC and GL261 heterotopic tumors. The NIR images indicated that 2C6F3 bound specifically to irradiated LLC and GL261 tumors, with little or no binding in un-irradiated tumors. We also determined the specificity of 2C6F3 to bind tumors in vivo using SPECT/CT imaging. 2C6F3 was conjugated with diethylene triamine penta acetic acid (DTPA) chelator and radiolabeled with 111Indium (111In). SPECT/CT imaging revealed that 111In-2C6F3 bound more to the irradiated LLC tumors compared to un-irradiated tumors. Furthermore, injection of DTPA-2C6F3 labeled with the therapeutic radioisotope, 90Y, (90Y-DTPA-2C6F3) significantly delayed LLC tumor growth. 2C6F3 mediated antibody dependent cell-mediated cytotoxicity (ADCC) and antibody dependent cell-mediated phagocytosis (ADCP) in vitro. In conclusion, the monoclonal antibody 2C6F3 binds specifically to TIP-1 on cancer and radio-immunoconjugated 2C6F3 improves tumor control.
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Affiliation(s)
- Heping Yan
- Department of Radiation Oncology, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Vaishali Kapoor
- Department of Radiation Oncology, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Kim Nguyen
- Department of Radiation Oncology, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Walter J Akers
- Mallinckrodt Institute of Radiology, Washington University in St. Louis, St. Louis, Missouri, USA.,Siteman Cancer Center, School of Medicine, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Hua Li
- Department of Radiation Oncology, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Jalen Scott
- Department of Radiation Oncology, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Richard Laforest
- Mallinckrodt Institute of Radiology, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Buck Rogers
- Department of Radiation Oncology, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Dinesh Thotala
- Department of Radiation Oncology, Washington University in St. Louis, St. Louis, Missouri, USA.,Siteman Cancer Center, School of Medicine, Washington University in St. Louis, St. Louis, Missouri, USA
| | - Dennis Hallahan
- Department of Radiation Oncology, Washington University in St. Louis, St. Louis, Missouri, USA.,Mallinckrodt Institute of Radiology, Washington University in St. Louis, St. Louis, Missouri, USA.,Siteman Cancer Center, School of Medicine, Washington University in St. Louis, St. Louis, Missouri, USA
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8
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Zhao B, Xue B. Self-regulation of functional pathways by motifs inside the disordered tails of beta-catenin. BMC Genomics 2016; 17 Suppl 5:484. [PMID: 27585692 PMCID: PMC5009561 DOI: 10.1186/s12864-016-2825-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Beta-catenin has two major functions: coordinating cell-cell adhesion by interacting with cadherin in cadherin junction formation pathway; and regulating gene expression through Wnt signaling pathway. Accomplishing these two functions requires synergistic action of various sequential regions of the same beta-Catenin molecule, including the N-terminal tail, the middle armadillo domain, and the C-terminal tail. Although the middle armadillo domain is the major functional unit of beta-Catenin, the involvement of tails in the regulation of interaction between beta-Catenin and its partners has been well observed. Nonetheless, the regulatory processes of both tails are still elusive. In addition, it is interesting to note that the three sequential regions have different structural features: The middle armadillo domain is structured, but both N- and C-terminal tails are disordered. This observation leads to another important question on the functions and mechanisms of disordered tails, which is also largely unknown. RESULTS In this study, we focused on the characterization of sequential, structural, and functional features of the disordered tails of beta-Catenin. We identified multiple functional motifs and conserved sequence motifs in the disordered tails, discovered the correlation between cancer-associated mutations and functional motifs, explored the abundance of protein intrinsic disorder in the interactomes of beta-Catenin, and elaborated a working model on the regulatory roles of disordered tails in the functional pathways of beta-Catenin. CONCLUSION Disordered tails of beta-Catenin contain multiple functional motifs. These motifs interact with each other and the armadillo domain of beta-catenin to regulate the function of beta-Catenin in both cadherin junction formation pathway and Wnt signaling pathway.
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Affiliation(s)
- Bi Zhao
- Department of Cell Biology, Microbiology and Molecular Biology, School of Natural Sciences and Mathematics, College of Arts and Sciences, University of South Florida, 4202 E. Fowler Ave, ISA 2015, Tampa, 33620 FL USA
| | - Bin Xue
- Department of Cell Biology, Microbiology and Molecular Biology, School of Natural Sciences and Mathematics, College of Arts and Sciences, University of South Florida, 4202 E. Fowler Ave, ISA 2015, Tampa, 33620 FL USA
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9
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Wang H, Heilshorn SC. Adaptable hydrogel networks with reversible linkages for tissue engineering. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2015; 27:3717-36. [PMID: 25989348 PMCID: PMC4528979 DOI: 10.1002/adma.201501558] [Citation(s) in RCA: 428] [Impact Index Per Article: 47.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Revised: 04/18/2015] [Indexed: 05/19/2023]
Abstract
Adaptable hydrogels have recently emerged as a promising platform for three-dimensional (3D) cell encapsulation and culture. In conventional, covalently crosslinked hydrogels, degradation is typically required to allow complex cellular functions to occur, leading to bulk material degradation. In contrast, adaptable hydrogels are formed by reversible crosslinks. Through breaking and re-formation of the reversible linkages, adaptable hydrogels can be locally modified to permit complex cellular functions while maintaining their long-term integrity. In addition, these adaptable materials can have biomimetic viscoelastic properties that make them well suited for several biotechnology and medical applications. In this review, an overview of adaptable-hydrogel design considerations and linkage selections is presented, with a focus on various cell-compatible crosslinking mechanisms that can be exploited to form adaptable hydrogels for tissue engineering.
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Affiliation(s)
- Huiyuan Wang
- Department of Materials Science & Engineering, Stanford University, Stanford, CA 94305, USA
| | - Sarah C. Heilshorn
- Department of Materials Science & Engineering, Stanford University, Stanford, CA 94305, USA
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10
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Grosso M, Kalstein A, Parisi G, Roitberg AE, Fernandez-Alberti S. On the analysis and comparison of conformer-specific essential dynamics upon ligand binding to a protein. J Chem Phys 2015; 142:245101. [DOI: 10.1063/1.4922925] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Affiliation(s)
- Marcos Grosso
- Universidad Nacional de Quilmes, Roque Saenz Peña 352, B1876BXD Bernal, Argentina
| | - Adrian Kalstein
- Universidad Nacional de Quilmes, Roque Saenz Peña 352, B1876BXD Bernal, Argentina
| | - Gustavo Parisi
- Universidad Nacional de Quilmes, Roque Saenz Peña 352, B1876BXD Bernal, Argentina
| | - Adrian E. Roitberg
- Departments of Physics and Chemistry, University of Florida, Gainesville, Florida 32611, USA
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11
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Nomme J, Antanasijevic A, Caffrey M, Van Itallie CM, Anderson JM, Fanning AS, Lavie A. Structural Basis of a Key Factor Regulating the Affinity between the Zonula Occludens First PDZ Domain and Claudins. J Biol Chem 2015; 290:16595-606. [PMID: 26023235 DOI: 10.1074/jbc.m115.646695] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2015] [Indexed: 11/06/2022] Open
Abstract
The molecular seal between epithelial cells, called the tight junction (TJ), is built by several membrane proteins, with claudins playing the most prominent role. The scaffold proteins of the zonula occludens family are required for the correct localization of claudins and hence formation of the TJ. The intracellular C terminus of claudins binds to the N-terminal PDZ domain of zonula occludens proteins (PDZ1). Of the 23 identified human claudin proteins, nine possess a tyrosine at the -6 position. Here we show that the claudin affinity for PDZ1 is dependent on the presence or absence of this tyrosine and that the affinity is reduced if the tyrosine is modified by phosphorylation. The PDZ1 β2-β3 loop undergoes a significant conformational change to accommodate this tyrosine. Cell culture experiments support a regulatory role for this tyrosine. Plasticity has been recognized as a critical property of TJs that allow cell remodeling and migration. Our work provides a molecular framework for how TJ plasticity may be regulated.
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Affiliation(s)
- Julian Nomme
- From the Department of Biochemistry and Molecular Genetics, University of Illinois, Chicago, Illinois 60607
| | - Aleksandar Antanasijevic
- From the Department of Biochemistry and Molecular Genetics, University of Illinois, Chicago, Illinois 60607
| | - Michael Caffrey
- From the Department of Biochemistry and Molecular Genetics, University of Illinois, Chicago, Illinois 60607
| | - Christina M Van Itallie
- Laboratory of Tight Junction Structure and Function, NHLBI, National Institutes of Health, Bethesda, Maryland 20892, and
| | - James M Anderson
- Laboratory of Tight Junction Structure and Function, NHLBI, National Institutes of Health, Bethesda, Maryland 20892, and
| | - Alan S Fanning
- Department of Cell Biology and Physiology, University of North Carolina, Chapel Hill, North Carolina 27599
| | - Arnon Lavie
- From the Department of Biochemistry and Molecular Genetics, University of Illinois, Chicago, Illinois 60607,
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12
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Reinstein E, Orvin K, Tayeb-Fligelman E, Stiebel-Kalish H, Tzur S, Pimienta AL, Bazak L, Bengal T, Cohen L, Gaton DD, Bormans C, Landau M, Kornowski R, Shohat M, Behar DM. Mutations inTAX1BP3Cause Dilated Cardiomyopathy with Septo-Optic Dysplasia. Hum Mutat 2015; 36:439-42. [DOI: 10.1002/humu.22759] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2014] [Accepted: 01/11/2015] [Indexed: 11/05/2022]
Affiliation(s)
- Eyal Reinstein
- The Raphael Recanati Genetic Institute; Rabin Medical Center; Israel
- Sackler School of Medicine; Tel Aviv University; Israel
| | - Katia Orvin
- Department of Cardiology; Rabin Medical Center; Israel
| | | | - Hadas Stiebel-Kalish
- Sackler School of Medicine; Tel Aviv University; Israel
- Department of Ophthalmology; Rabin Medical Center; Israel
| | - Shay Tzur
- Laboratory of Molecular Medicine; Rambam Health Care Campus; Haifa Israel
| | - Allen L. Pimienta
- Faculty of Medicine; Technion-Israel Institute of Technology; Haifa Israel
| | - Lily Bazak
- The Raphael Recanati Genetic Institute; Rabin Medical Center; Israel
| | - Tuvia Bengal
- Department of Cardiology; Rabin Medical Center; Israel
| | - Lior Cohen
- The Raphael Recanati Genetic Institute; Rabin Medical Center; Israel
| | - Dan D. Gaton
- Sackler School of Medicine; Tel Aviv University; Israel
- Department of Ophthalmology; Rabin Medical Center; Israel
| | | | - Meytal Landau
- Department of Biology; Technion-Israel Institute of Technology; Haifa Israel
| | - Ran Kornowski
- Department of Cardiology; Rabin Medical Center; Israel
| | - Mordechai Shohat
- The Raphael Recanati Genetic Institute; Rabin Medical Center; Israel
- Sackler School of Medicine; Tel Aviv University; Israel
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13
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Mohanty S, Ovee M, Banerjee M. PDZ Domain Recognition: Insight from Human Tax-Interacting Protein 1 (TIP-1) Interaction with Target Proteins. BIOLOGY 2015; 4:88-103. [PMID: 25665168 PMCID: PMC4381219 DOI: 10.3390/biology4010088] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 01/22/2015] [Accepted: 01/23/2015] [Indexed: 11/16/2022]
Abstract
Cellular signaling is primarily directed via protein-protein interactions. PDZ (PSD-95/Discs large/ZO-1 homologous) domains are well known protein-protein interaction modules involved in various key signaling pathways. Human Tax-interacting protein 1 (TIP-1), also known as glutaminase interaction protein (GIP), is a Class I PDZ domain protein that recognizes the consensus binding motif X-S/T-X-V/I/L-COOH of the C-terminus of its target proteins. We recently reported that TIP-1 not only interacts via the C-terminus of its target partner proteins but also recognizes an internal motif defined by the consensus sequence S/T-X-V/L-D in the target protein. Identification of new target partners containing either a C-terminal or internal recognition motif has rapidly expanded the TIP-1 protein interaction network. TIP-1 being composed solely of a single PDZ domain is unique among PDZ containing proteins. Since it is involved in many important signaling pathways, it is a possible target for drug design. In this mini review, we have discussed human TIP-1, its structure, mechanism of function, its interactions with target proteins containing different recognition motifs, and its involvement in human diseases. Understanding the molecular mechanisms of TIP-1 interactions with distinct target partners and their role in human diseases will be useful for designing novel therapeutics.
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Affiliation(s)
- Smita Mohanty
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078, USA.
| | - Mohiuddin Ovee
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078, USA.
| | - Monimoy Banerjee
- Department of Chemistry, Oklahoma State University, Stillwater, OK 74078, USA.
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14
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Gujral TS, Karp ES, Chan M, Chang BH, MacBeath G. Family-wide investigation of PDZ domain-mediated protein-protein interactions implicates β-catenin in maintaining the integrity of tight junctions. ACTA ACUST UNITED AC 2014; 20:816-27. [PMID: 23790492 DOI: 10.1016/j.chembiol.2013.04.021] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2013] [Revised: 03/26/2013] [Accepted: 04/18/2013] [Indexed: 01/22/2023]
Abstract
β-catenin is a multifunctional protein that plays a critical role in cell-cell contacts and signal transduction. β-catenin has previously been shown to interact with PDZ-domain-containing proteins through its C terminus. Using protein microarrays comprising 206 mouse PDZ domains, we identified 26 PDZ-domain-mediated interactions with β-catenin and confirmed them biochemically and in cellular lysates. Many of the previously unreported interactions involved proteins with annotated roles in tight junctions. We found that four tight-junction-associated PDZ proteins-Scrib, Magi-1, Pard3, and ZO-3-colocalize with β-catenin at the plasma membrane. Disrupting these interactions by RNA interference, overexpression of PDZ domains, or overexpression of the β-catenin C terminus altered localization of the full-length proteins, weakened tight junctions, and decreased cellular adhesion. These results suggest that β-catenin serves as a scaffold to establish the location and function of tight-junction-associated proteins.
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Affiliation(s)
- Taranjit S Gujral
- Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA
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15
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Ferraro DJ, Bhave SR, Kotipatruni RP, Hunn JC, Wildman SA, Hong C, Dadey DYA, Muhoro LK, Jaboin JJ, Thotala D, Hallahan DE. High-throughput identification of putative receptors for cancer-binding peptides using biopanning and microarray analysis. Integr Biol (Camb) 2013; 5:342-50. [PMID: 23147990 DOI: 10.1039/c2ib20187a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Phage-display peptide biopanning has been successfully used to identify cancer-targeting peptides in multiple models. For cancer-binding peptides, identification of the peptide receptor is necessary to demonstrate the mechanism of action and to further optimize specificity and target binding. The process of receptor identification can be slow and some peptides may turn out to bind ubiquitous proteins not suitable for further drug development. In this report, we describe a high-throughput method for screening a large number of peptides in parallel to identify peptide receptors, which we have termed "reverse biopanning." Peptides can then be selected for further development based on their receptor. To demonstrate this method, we screened a library of 39 peptides previously identified in our laboratory to bind specifically to cancers after irradiation. The reverse biopanning process identified 2 peptides, RKFLMTTRYSRV and KTAKKNVFFCSV, as candidate ligands for the protein tax interacting protein 1 (TIP-1), a protein previously identified in our laboratory to be expressed in tumors and upregulated after exposure to ionizing radiation. We used computational modeling as the initial method for rapid validation of peptide-TIP-1 binding. Pseudo-binding energies were calculated to be -360.645 kcal mol(-1), -487.239 kcal mol(-1), and -595.328 kcal mol(-1) for HVGGSSV, TTRYSRV, and NVFFCSV respectively, suggesting that the peptides would have at least similar, if not stronger, binding to TIP-1 compared to the known TIP-1 binding peptide HVGGSSV. We validated peptide binding in vitro using electrophoretic mobility shift assay, which showed strong binding of RKFLMTTRYSRV and the truncated form TTRYSRV. This method allows for the identification of many peptide receptors and subsequent selection of peptides for further drug development based on the peptide receptor.
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Affiliation(s)
- Daniel J Ferraro
- Department of Radiation Oncology, Mallinckrodt Institute of Radiology, and Siteman Cancer Center, Washington University School of Medicine, 4511 Forest Park, Saint Louis, MO 63110, USA
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16
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Two-Component Protein Hydrogels Assembled Using an Engineered Disulfide-Forming Protein–Ligand Pair. Biomacromolecules 2013; 14:2909-16. [DOI: 10.1021/bm400814u] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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17
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Wang H, Han M, Whetsell W, Wang J, Rich J, Hallahan D, Han Z. Tax-interacting protein 1 coordinates the spatiotemporal activation of Rho GTPases and regulates the infiltrative growth of human glioblastoma. Oncogene 2013; 33:1558-69. [PMID: 23563176 PMCID: PMC3965267 DOI: 10.1038/onc.2013.97] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Revised: 01/17/2013] [Accepted: 02/04/2013] [Indexed: 12/28/2022]
Abstract
PDZ domains represent one group of the major structural units that mediate protein interactions in intercellular contact, signal transduction and assembly of biological machineries. TIP-1 protein is composed of a single PDZ domain that distinguishes TIP-1 from other PDZ domain proteins that more often contain multiple protein domains and function as scaffolds for protein complex assembly. However, the biological functions of TIP-1, especially in cell transformation and tumor progression, are still controversial as observed in a variety of cell types. In this study, we have identified ARHGEF7, a guanine nucleotide exchange factor (GEF) for Rho GTPases, as one novel TIP-1 interacting protein in human glioblastoma cells. We found that the presence of TIP-1 protein is essential to the intracellular redistribution of ARHGEF7 and rhotekin, one Rho effector, and the spatiotemporally coordinated activation of Rho GTPases (RhoA, Cdc42 and Rac1) in migrating glioblastoma cells. TIP-1 knockdown resulted in both aberrant localization of ARHGEF7 and rhotekin, as well as abnormal activation of Rho GTPases that was accompanied with impaired motility of glioblastoma cells. Furthermore, TIP-1 knockdown suppressed tumor cell dispersal in orthotopic glioblastoma murine models. We also observed high levels of TIP-1 expression in human glioblastoma specimens, and the elevated TIP-1 levels are associated with advanced staging and poor prognosis in glioma patients. Although more studies are needed to further dissect the mechanism(s) by which TIP-1 modulates the intracellular redistribution and activation of Rho GTPases, this study suggests that TIP-1 holds potential as both a prognostic biomarker and a therapeutic target of malignant gliomas.
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Affiliation(s)
- H Wang
- 1] Department of Radiation Oncology, Vanderbilt University School of Medicine, Nashville, TN, USA [2] Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - M Han
- 1] Department of Radiation Oncology, Vanderbilt University School of Medicine, Nashville, TN, USA [2] Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Science, Kunming, China [3] Graduate School, Chinese Academy of Sciences, Beijing, China
| | - W Whetsell
- Department of Pathology, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - J Wang
- 1] Department of Neurological Surgery, Vanderbilt University School of Medicine, Nashville, TN, USA [2] Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN, USA
| | - J Rich
- Department of Stem Cell Biology and Regenerative Medicine, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - D Hallahan
- Department of Radiation Oncology, Washington University School of Medicine, St Louis, MO, USA
| | - Z Han
- 1] Department of Radiation Oncology, Vanderbilt University School of Medicine, Nashville, TN, USA [2] Department of Cancer Biology, Vanderbilt University School of Medicine, Nashville, TN, USA [3] Vanderbilt-Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN, USA
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18
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Direct targeting of β-catenin: Inhibition of protein-protein interactions for the inactivation of Wnt signaling. Bioorg Med Chem 2013; 21:4020-6. [PMID: 23566764 DOI: 10.1016/j.bmc.2013.02.050] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Accepted: 02/28/2013] [Indexed: 01/05/2023]
Abstract
The activation of developmental signaling pathways such as Notch, Hedgehog and Wnt has implications in the onset and progression of numerous types of cancer. Consequently, targeting of such pathways is considered an attractive therapeutic approach. Inhibition of the Wnt signaling cascade proves to be complicated, in part, due to the lack of druggable pathway components. The central hub in Wnt signaling is the protein β-catenin, which is involved in numerous protein-protein interactions. In general, the inhibition of protein-protein interactions is challenging in particular with binding interfaces lacking pronounced hydrophobic pockets. Herein, we give an overview of β-catenin-protein interactions, and we review active agents that were reported to inhibit canonical Wnt signaling via direct targeting of β-catenin.
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19
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Hulpiau P, Gul IS, van Roy F. New insights into the evolution of metazoan cadherins and catenins. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2013; 116:71-94. [PMID: 23481191 DOI: 10.1016/b978-0-12-394311-8.00004-2] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
E-Cadherin and β-catenin are the best studied representatives of the superfamilies of transmembrane cadherins and intracellular armadillo catenins, respectively. However, in over 600 million years of multicellular animal evolution, these two superfamilies have diversified remarkably both structurally and functionally. Although their basic building blocks, respectively, the cadherin repeat domain and the armadillo repeat domain, predate metazoans, the specific and complex domain compositions of the different family members and their functional roles in cell adhesion and signaling appear to be key features for the emergence of multicellular animal life. Basal animals such as placozoans and sponges have a limited number of distinct cadherins and catenins. The origin of vertebrates, in particular, coincided with a large increase in the number of cadherins and armadillo proteins, including modern "classical" cadherins, protocadherins, and plakophilins. Also, α-catenins increased. This chapter introduces the many different family members and describes the putative evolutionary relationships between them.
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Affiliation(s)
- Paco Hulpiau
- Department for Molecular Biomedical Research, VIB, Ghent, Belgium
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20
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Amacher JF, Cushing PR, Bahl CD, Beck T, Madden DR. Stereochemical determinants of C-terminal specificity in PDZ peptide-binding domains: a novel contribution of the carboxylate-binding loop. J Biol Chem 2012; 288:5114-26. [PMID: 23243314 DOI: 10.1074/jbc.m112.401588] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
PDZ (PSD-95/Dlg/ZO-1) binding domains often serve as cellular traffic engineers, controlling the localization and activity of a wide variety of binding partners. As a result, they play important roles in both physiological and pathological processes. However, PDZ binding specificities overlap, allowing multiple PDZ proteins to mediate distinct effects on shared binding partners. For example, several PDZ domains bind the cystic fibrosis (CF) transmembrane conductance regulator (CFTR), an epithelial ion channel mutated in CF. Among these binding partners, the CFTR-associated ligand (CAL) facilitates post-maturational degradation of the channel and is thus a potential therapeutic target. Using iterative optimization, we previously developed a selective CAL inhibitor peptide (iCAL36). Here, we investigate the stereochemical basis of iCAL36 specificity. The crystal structure of iCAL36 in complex with the CAL PDZ domain reveals stereochemical interactions distributed along the peptide-binding cleft, despite the apparent degeneracy of the CAL binding motif. A critical selectivity determinant that distinguishes CAL from other CFTR-binding PDZ domains is the accommodation of an isoleucine residue at the C-terminal position (P(0)), a characteristic shared with the Tax-interacting protein-1. Comparison of the structures of these two PDZ domains in complex with ligands containing P(0) Leu or Ile residues reveals two distinct modes of accommodation for β-branched C-terminal side chains. Access to each mode is controlled by distinct residues in the carboxylate-binding loop. These studies provide new insights into the primary sequence determinants of binding motifs, which in turn control the scope and evolution of PDZ interactomes.
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Affiliation(s)
- Jeanine F Amacher
- Department of Biochemistry, Geisel School of Medicine at Dartmouth, Hanover, New Hampshire 03755, USA
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21
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Han M, Wang H, Zhang HT, Han Z. Expression of TIP-1 confers radioresistance of malignant glioma cells. PLoS One 2012; 7:e45402. [PMID: 23028987 PMCID: PMC3444456 DOI: 10.1371/journal.pone.0045402] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Accepted: 08/22/2012] [Indexed: 02/03/2023] Open
Abstract
BACKGROUND Malignant gliomas represent one group of tumors that poorly respond to ionizing radiation (IR) alone or combined with chemotherapeutic agents because of the intrinsic or acquired resistance. In this study, TIP-1 was identified as one novel protein that confers resistance of glioma cells to IR. METHODOLOGY/PRINCIPAL FINDINGS Meta-analysis indicated that high TIP-1 expression levels correlate with the poor prognosis of human malignant gliomas after radiotherapy. Studies with established human glioma cell lines demonstrated that TIP-1 depletion with specific shRNAs sensitized the cells to IR, whereas an ectopic expression of TIP-1 protected the glioma cells from the IR-induced DNA damage and cell death. Biochemical studies indicated that TIP-1 protein promoted p53 ubiquitination and resulted in a reduced p53 protein level. Furthermore, p53 and its ubiquitination are required for the TIP-1 regulated cellular response to IR. A yeast two-hybrid screening identified that TIP-1, through its single PDZ domain, binds to the carboxyl terminus of LZAP that has been studied as one tumor suppressor functioning through ARF binding and p53 activation. It was revealed that the presence of TIP-1 enhances the protein association between LZAP and ARF and modulates the functionality of ARF/HDM2 toward multi-ubiquitination of p53, while depleting TIP-1 rescued p53 from polyubiquitination and degradation in the irradiated glioma cells. Studies with a mouse xenograft model indicated that depleting TIP-1 within D54 cells improved the tumor growth control with IR. CONCLUSIONS/SIGNIFICANCE This study provided the first evidence showing that TIP-1 modulates p53 protein stability and is involved in the radioresistance of malignant gliomas, suggesting that antagonizing TIP-1 might be one novel approach to sensitize malignant gliomas to radiotherapy.
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Affiliation(s)
- Miaojun Han
- Department of Radiation Oncology, Vanderbilt University, Nashville, Tennessee, United States of America
- Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences & Yunnan Province, Kunming Institute of Zoology, Kunming, Yunnan Province, China
- Graduate School, Chinese Academy of Sciences, Beijing, China
| | - Hailun Wang
- Department of Radiation Oncology, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Hua-Tang Zhang
- Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences & Yunnan Province, Kunming Institute of Zoology, Kunming, Yunnan Province, China
| | - Zhaozhong Han
- Department of Radiation Oncology, Vanderbilt University, Nashville, Tennessee, United States of America
- Cancer Biology, Vanderbilt University, Nashville, Tennessee, United States of America
- Vanderbilt-Ingram Cancer Center, School of Medicine, Vanderbilt University, Nashville, Tennessee, United States of America
- * E-mail:
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22
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Banerjee M, Zoetewey DL, Ovee M, Mazumder S, Petrenko VA, Samoylova TI, Mohanty S. Specificity and promiscuity in human glutaminase interacting protein recognition: insight from the binding of the internal and C-terminal motif. Biochemistry 2012; 51:6950-60. [PMID: 22876914 DOI: 10.1021/bi3008033] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A large number of cellular processes are mediated by protein-protein interactions, often specified by particular protein binding modules. PDZ domains make up an important class of protein-protein interaction modules that typically bind to the C-terminus of target proteins. These domains act as a scaffold where signaling molecules are linked to a multiprotein complex. Human glutaminase interacting protein (GIP), also known as tax interacting protein 1, is unique among PDZ domain-containing proteins because it is composed almost exclusively of a single PDZ domain rather than one of many domains as part of a larger protein. GIP plays pivotal roles in cellular signaling, protein scaffolding, and cancer pathways via its interaction with the C-terminus of a growing list of partner proteins. We have identified novel internal motifs that are recognized by GIP through combinatorial phage library screening. Leu and Asp residues in the consensus sequence were identified to be critical for binding to GIP through site-directed mutagenesis studies. Structure-based models of GIP bound to two different surrogate peptides determined from nuclear magnetic resonance constraints revealed that the binding pocket is flexible enough to accommodate either the smaller carboxylate (COO(-)) group of a C-terminal recognition motif or the bulkier aspartate side chain (CH(2)COO(-)) of an internal motif. The noncanonical ILGF loop in GIP moves in for the C-terminal motif but moves out for the internal recognition motifs, allowing binding to different partner proteins. One of the peptides colocalizes with GIP within human glioma cells, indicating that GIP might be a potential target for anticancer therapeutics.
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Affiliation(s)
- Monimoy Banerjee
- Department of Chemistry and Biochemistry, Auburn University, Auburn, AL 36849, USA
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23
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Xie X, Yan X, Wang Z, Zhou H, Diao W, Zhou W, Long J, Shen Y. Open-closed motion of Mint2 regulates APP metabolism. J Mol Cell Biol 2012; 5:48-56. [PMID: 22730553 DOI: 10.1093/jmcb/mjs033] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
The amyloid-β protein precursor (APP) plays a crucial role in the pathogenesis of Alzheimer's disease (AD). Knock-out and transgenic mouse studies of the adaptor protein Mint2 have revealed that it is a major player in regulating APP metabolism physiologically through the binding of its phosphotyrosine-binding (PTB) domain to the intracellular domain of APP. However, the molecular mechanism of APP dynamically binding to Mint2 remains elusive. Here, we report the structures of APP peptide-free and APP peptide-bound C-terminal Mint2 mutants at resolutions of 2.7 and 3.3 Å, respectively. Our structures reveal that APP peptide-free Mint2 exists in a closed state in which the ARM domain blocks the peptide-binding groove of the PTB domain. In sharp contrast, APP peptide-bound Mint2 exists in an open state in which the ARM domain drastically swings away from the bound peptide. Mutants that control the open-closed motion of Mint2 dynamically regulated APP metabolism both in vitro and in vivo. Our results uncover a novel open-closed mechanism of the PTB domain dynamically binding to its peptide substrate. Moreover, such a conformational switch may represent a general regulation mode of APP family members by Mint proteins, providing useful information for the treatment of AD.
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Affiliation(s)
- Xingqiao Xie
- State Key Laboratory of Medicinal Chemical Biology, Nankai University, 94 Weijin Road, Tianjin 300071, China
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24
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Han M, Wang H, Zhang HT, Han Z. The PDZ protein TIP-1 facilitates cell migration and pulmonary metastasis of human invasive breast cancer cells in athymic mice. Biochem Biophys Res Commun 2012; 422:139-45. [PMID: 22564736 DOI: 10.1016/j.bbrc.2012.04.123] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2012] [Accepted: 04/22/2012] [Indexed: 11/25/2022]
Abstract
Tax-interacting protein 1 (TIP-1, also known as Tax1bp3) inhibited proliferation of colon cancer cells through antagonizing the transcriptional activity of beta-catenin. However, in this study, elevated TIP-1 expression levels were detected in human invasive breast cancers. Studies with two human invasive breast cancer cell lines indicated that RNAi-mediated TIP-1 knockdown suppressed the cell adhesion, proliferation, migration and invasion in vitro, and inhibited tumor growth in mammary fat pads and pulmonary metastasis in athymic mice. Biochemical studies showed that TIP-1 knockdown had moderate and differential effects on the beta-catenin-regulated gene expression, but remarkably down regulated the genes for cell adhesion and motility in breast cancer cells. The decreased expression of integrins and paxillin was accompanied with reduced cell adhesion and focal adhesion formation on fibronectin-coated surface. In conclusion, this study revealed a novel oncogenic function of TIP-1 suggesting that TIP-1 holds potential as a prognostic biomarker and a therapeutic target in the treatment of human invasive breast cancers.
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Affiliation(s)
- Miaojun Han
- Key Laboratory of Animal Models and Human Disease Mechanisms of the Chinese Academy of Sciences & Yunnan Province, Kunming Institute of Zoology, Yunnan, China
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25
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Luck K, Charbonnier S, Travé G. The emerging contribution of sequence context to the specificity of protein interactions mediated by PDZ domains. FEBS Lett 2012; 586:2648-61. [PMID: 22709956 DOI: 10.1016/j.febslet.2012.03.056] [Citation(s) in RCA: 94] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2012] [Revised: 03/26/2012] [Accepted: 03/27/2012] [Indexed: 12/18/2022]
Abstract
The canonical binding mode of PDZ domains to target motifs involves a small interface, unlikely to fully account for PDZ-target interaction specificities. Here, we review recent work on sequence context, defined as the regions surrounding not only the PDZ domains but also their target motifs. We also address the theoretical problem of defining the core of PDZ domains and the practical issue of designing PDZ constructs. Sequence context is found to introduce structural diversity, to impact the stability and solubility of constructs, and to deeply influence binding affinity and specificity, thereby increasing the difficulty of predicting PDZ-motif interactions. We expect that sequence context will have similar importance for other protein interactions mediated by globular domains binding to short linear motifs.
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Affiliation(s)
- Katja Luck
- UMR 7242, Institut de Recherche de l'Ecole de Biotechnologie de Strasbourg, Bd Sébastien Brant, BP 10413, 67412 Illkirch, Cedex, France.
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26
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Li N, Hou T, Ding B, Wang W. Characterization of PDZ domain-peptide interaction interface based on energetic patterns. Proteins 2011; 79:3208-20. [PMID: 21928318 DOI: 10.1002/prot.23157] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2010] [Revised: 07/12/2011] [Accepted: 07/14/2011] [Indexed: 11/12/2022]
Abstract
PDZ domain is one of the abundant modular domains that recognize short peptide sequences to mediate protein-protein interactions. To decipher the binding specificity of PDZ domain, we analyzed the interactions between 11 mouse PDZ domains and 217 [corrected] peptides using a method called MIEC-SVM, which energetically characterizes the domain-peptide interaction using molecular interaction energy components (MIECs) and predicts binding specificity using support vector machine (SVM). Cross-validation and leave-one-domain-out test showed that the MIEC-SVM using all 44 PDZ-peptide residue pairs at the interaction interface outperformed the sequence-based methods in the literature. A further feature (residue pair) selection procedure illustrated that 16 residue pairs were uninformative to the binding specificity, even though they contributed significantly (~50%) to the binding energy. If only using the 28 informative residue pairs, the performance of the MIEC-SVM on predicting the PDZ binding specificity was significantly improved. This analysis suggests that the informative and uninformative residue interactions between the PDZ domain and the peptide may represent those contributing to binding specificity and affinity, respectively. We performed additional structural and energetic analyses to shed light on understanding how the PDZ-peptide recognition is established. The success of the MIEC-SVM method on PDZ domains in this study and SH3 domains in our previous studies illustrates its generality on characterizing protein-peptide interactions and understanding protein recognition from a structural and energetic viewpoint.
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Affiliation(s)
- Nan Li
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093-0359, USA
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27
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Zencir S, Ovee M, Dobson MJ, Banerjee M, Topcu Z, Mohanty S. Identification of brain-specific angiogenesis inhibitor 2 as an interaction partner of glutaminase interacting protein. Biochem Biophys Res Commun 2011; 411:792-7. [PMID: 21787750 DOI: 10.1016/j.bbrc.2011.07.029] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2011] [Accepted: 07/12/2011] [Indexed: 10/17/2022]
Abstract
The vast majority of physiological processes in living cells are mediated by protein-protein interactions often specified by particular protein sequence motifs. PDZ domains, composed of 80-100 amino acid residues, are an important class of interaction motif. Among the PDZ-containing proteins, glutaminase interacting protein (GIP), also known as Tax Interacting Protein TIP-1, is unique in being composed almost exclusively of a single PDZ domain. GIP has important roles in cellular signaling, protein scaffolding and modulation of tumor growth and interacts with a number of physiological partner proteins, including Glutaminase L, β-Catenin, FAS, HTLV-1 Tax, HPV16 E6, Rhotekin and Kir 2.3. To identify the network of proteins that interact with GIP, a human fetal brain cDNA library was screened using a yeast two-hybrid assay with GIP as bait. We identified brain-specific angiogenesis inhibitor 2 (BAI2), a member of the adhesion-G protein-coupled receptors (GPCRs), as a new partner of GIP. BAI2 is expressed primarily in neurons, further expanding GIP cellular functions. The interaction between GIP and the carboxy-terminus of BAI2 was characterized using fluorescence, circular dichroism (CD) and nuclear magnetic resonance (NMR) spectroscopy assays. These biophysical analyses support the interaction identified in the yeast two-hybrid assay. This is the first study reporting BAI2 as an interaction partner of GIP.
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Affiliation(s)
- Sevil Zencir
- Department of Biochemistry, Faculty of Science, Ege University, Izmir, Turkey
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28
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Yu J, Li X, Wang Y, Li B, Li H, Li Y, Zhou W, Zhang C, Wang Y, Rao Z, Bartlam M, Cao Y. PDlim2 selectively interacts with the PDZ binding motif of highly pathogenic avian H5N1 influenza A virus NS1. PLoS One 2011; 6:e19511. [PMID: 21625420 PMCID: PMC3100292 DOI: 10.1371/journal.pone.0019511] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2010] [Accepted: 03/30/2011] [Indexed: 01/07/2023] Open
Abstract
The multi-functional NS1 protein of influenza A virus is a viral virulence determining factor. The last four residues at the C-terminus of NS1 constitute a type I PDZ domain binding motif (PBM). Avian influenza viruses currently in circulation carry an NS1 PBM with consensus sequence ESEV, whereas human influenza viruses bear an NS1 PBM with consensus sequence RSKV or RSEV. The PBM sequence of the influenza A virus NS1 is reported to contribute to high viral pathogenicity in animal studies. Here, we report the identification of PDlim2 as a novel binding target of the highly pathogenic avian influenza virus H5N1 strain with an NS1 PBM of ESEV (A/Chicken/Henan/12/2004/H5N1, HN12-NS1) by yeast two-hybrid screening. The interaction was confirmed by in vitro GST pull-down assays, as well as by in vivo mammalian two-hybrid assays and bimolecular fluorescence complementation assays. The binding was also confirmed to be mediated by the interaction of the PDlim2 PDZ domain with the NS1 PBM motif. Interestingly, our assays showed that PDlim2 bound specifically with HN12-NS1, but exhibited no binding to NS1 from a human influenza H1N1 virus bearing an RSEV PBM (A/Puerto Rico/8/34/H1N1, PR8-NS1). A crystal structure of the PDlim2 PDZ domain fused with the C-terminal hexapeptide from HN12-NS1, together with GST pull-down assays on PDlim2 mutants, reveals that residues Arg16 and Lys31 of PDlim2 are critical for the binding between PDlim2 and HN12-NS1. The identification of a selective binding target of HN12-NS1 (ESEV), but not PR8-NS1 (RSEV), enables us to propose a structural mechanism for the interaction between NS1 PBM and PDlim2 or other PDZ-containing proteins.
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Affiliation(s)
- Jia Yu
- Tianjin Key Laboratory of Protein Science,
College of Life Sciences, Nankai University, Tianjin, China
| | - Xin Li
- Tianjin Key Laboratory of Protein Science,
College of Life Sciences, Nankai University, Tianjin, China
| | - Yu Wang
- Tianjin Key Laboratory of Protein Science,
College of Life Sciences, Nankai University, Tianjin, China
| | - Bo Li
- Tianjin Key Laboratory of Protein Science,
College of Life Sciences, Nankai University, Tianjin, China
| | - Hongyue Li
- Tianjin Key Laboratory of Protein Science,
College of Life Sciences, Nankai University, Tianjin, China
| | - Yapeng Li
- Tianjin Key Laboratory of Protein Science,
College of Life Sciences, Nankai University, Tianjin, China
| | - Weihong Zhou
- Tianjin Key Laboratory of Protein Science,
College of Life Sciences, Nankai University, Tianjin, China
| | - Cuizhu Zhang
- Tianjin Key Laboratory of Protein Science,
College of Life Sciences, Nankai University, Tianjin, China
| | - Yingying Wang
- Key Laboratory of Pollution Processes and
Environmental Criteria (Ministry of Education), College of Environmental Science
and Engineering, Nankai University, Tianjin, China
| | - Zihe Rao
- Tianjin Key Laboratory of Protein Science,
College of Life Sciences, Nankai University, Tianjin, China
| | - Mark Bartlam
- Tianjin Key Laboratory of Protein Science,
College of Life Sciences, Nankai University, Tianjin, China
- * E-mail: (YC); (MB)
| | - Youjia Cao
- Tianjin Key Laboratory of Protein Science,
College of Life Sciences, Nankai University, Tianjin, China
- * E-mail: (YC); (MB)
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29
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Zoetewey DL, Ovee M, Banerjee M, Bhaskaran R, Mohanty S. Promiscuous binding at the crossroads of numerous cancer pathways: insight from the binding of glutaminase interacting protein with glutaminase L. Biochemistry 2011; 50:3528-39. [PMID: 21417405 DOI: 10.1021/bi102055y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The glutaminase interacting protein (GIP) is composed of a single PDZ domain that interacts with a growing list of partner proteins, including glutaminase L, that are involved in a number of cell signaling and cancer pathways. Therefore, GIP makes a good target for structure-based drug design. Here, we report the solution structures of both free GIP and GIP bound to the C-terminal peptide analogue of glutaminase L. This is the first reported nuclear magnetic resonance structure of GIP in a complex with one of its binding partners. Our analysis of both free GIP and GIP in a complex with the glutaminase L peptide provides important insights into how a promiscuous binding domain can have affinity for multiple binding partners. Through a detailed chemical shift perturbation analysis and backbone dynamics studies, we demonstrate here that the binding of the glutaminase L peptide to GIP is an allosteric event. Taken together, the insights reported here lay the groundwork for the future development of a specific inhibitor for GIP.
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Affiliation(s)
- David L Zoetewey
- Department of Chemistry and Biochemistry, Auburn University, Alabama 36849, United States
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30
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The structural and dynamic response of MAGI-1 PDZ1 with noncanonical domain boundaries to the binding of human papillomavirus E6. J Mol Biol 2011; 406:745-63. [PMID: 21238461 DOI: 10.1016/j.jmb.2011.01.015] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2010] [Revised: 01/06/2011] [Accepted: 01/07/2011] [Indexed: 11/23/2022]
Abstract
PDZ domains are protein interaction domains that are found in cytoplasmic proteins involved in signaling pathways and subcellular transport. Their roles in the control of cell growth, cell polarity, and cell adhesion in response to cell contact render this family of proteins targets during the development of cancer. Targeting of these network hubs by the oncoprotein E6 of "high-risk" human papillomaviruses (HPVs) serves to effect the efficient disruption of cellular processes. Using NMR, we have solved the three-dimensional solution structure of an extended construct of the second PDZ domain of MAGI-1 (MAGI-1 PDZ1) alone and bound to a peptide derived from the C-terminus of HPV16 E6, and we have characterized the changes in backbone dynamics and hydrogen bonding that occur upon binding. The binding event induces quenching of high-frequency motions in the C-terminal tail of the PDZ domain, which contacts the peptide upstream of the canonical X-[T/S]-X-[L/V] binding motif. Mutations designed in the C-terminal flanking region of the PDZ domain resulted in a significant decrease in binding affinity for E6 peptides. This detailed analysis supports the notion of a global response of the PDZ domain to the binding event, with effects propagated to distal sites, and reveals unexpected roles for the sequences flanking the canonical PDZ domain boundaries.
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31
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Survey of the year 2008: applications of isothermal titration calorimetry. J Mol Recognit 2010; 23:395-413. [DOI: 10.1002/jmr.1025] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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32
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Durney MA, Birrane G, Anklin C, Soni A, Ladias JAA. Solution structure of the human Tax-interacting protein-1. JOURNAL OF BIOMOLECULAR NMR 2009; 45:329-334. [PMID: 19685007 DOI: 10.1007/s10858-009-9361-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2009] [Accepted: 07/23/2009] [Indexed: 05/28/2023]
Affiliation(s)
- Michael A Durney
- Molecular Medicine Laboratory and Macromolecular Crystallography Unit, Department of Medicine, Harvard Medical School, Boston, MA, 02215, USA
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33
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Yan X, Zhou H, Zhang J, Shi C, Xie X, Wu Y, Tian C, Shen Y, Long J. Molecular mechanism of inward rectifier potassium channel 2.3 regulation by tax-interacting protein-1. J Mol Biol 2009; 392:967-76. [PMID: 19635485 DOI: 10.1016/j.jmb.2009.07.060] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2009] [Revised: 06/10/2009] [Accepted: 07/21/2009] [Indexed: 01/02/2023]
Abstract
Inwardly rectifying potassium channel 2.3 (Kir2.3) is specifically targeted on the basolateral membranes of epithelial and neuronal cells, and it thus plays an important role in maintaining potassium homeostasis. Tax-interacting protein-1 (TIP-1), an atypical PDZ-domain-containing protein, binds to Kir2.3 with a high affinity, causing the intracellular accumulation of Kir2.3 in cultured epithelial cells. However, the molecular basis of the TIP-1/Kir2.3 interaction is still poorly understood. Here, we present the crystal structure of TIP-1 in complex with the C-terminal Kir2.3-peptide (residues 436-445) to reveal the molecular details of the interaction between them. Moreover, isothermal titration calorimetry experiments show that the C-terminal Kir2.3-peptide binds much more strongly to TIP-1 than to mammalian Lin-7, indicating that TIP-1 can compete with mammalian Lin-7 to uncouple Kir2.3 from its basolateral membrane anchoring complex. We further show that the phosphorylation/dephosphorylation of Ser443 within the C-terminal Kir2.3 PDZ-binding motif RRESAI dynamically regulates the Kir2.3/TIP-1 association in heterologous HEK293T cells. These data suggest that TIP-1 may act as an important regulator for the endocytic pathway of Kir2.3.
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Affiliation(s)
- Xiaojie Yan
- Tianjin Key Laboratory of Protein Science, College of Life Science, Nankai University, Tianjin 300071, China
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