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Wirth D, Özdemir E, Hristova K. Probing phosphorylation events in biological membranes: The transducer function. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2024; 1866:184362. [PMID: 38885782 PMCID: PMC11365757 DOI: 10.1016/j.bbamem.2024.184362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2024] [Revised: 05/26/2024] [Accepted: 06/10/2024] [Indexed: 06/20/2024]
Abstract
The extracellular environment is sensed by receptors in the plasma membrane. Some of these receptors initiate cytoplasmic signaling cascades involving phosphorylation: the addition of a phosphate group to a specific amino acid, such as tyrosine, in a protein. Receptor Tyrosine Kinases (RTKs) are one large class of membrane receptors that can directly initiate signaling cascades through their intracellular kinase domains, which both catalyze tyrosine phosphorylation and get phosphorylated. In the first step of signaling, the ligands stabilize phosphorylation-competent RTK dimers and oligomers, which leads to the phosphorylation of specific tyrosine residues in the activation loop of the kinases. Here we discuss quantitative measurements of tyrosine phosphorylation efficiencies for RTKs, described by the "transducer function". The transducer function links the phosphorylation (the response) and the binding of the activating ligand to the receptor (the stimulus). We overview a methodology that allows such measurements in direct response to ligand binding. We discuss experiments which demonstrate that EGF is a partial agonist, and that two tyrosines in the intracellular domain of EGFR, Y1068 and Y1173, are differentially phosphorylated in the EGF-bound EGFR dimers.
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Affiliation(s)
- Daniel Wirth
- Department of Materials Science and Engineering and Institute for NanoBioTechnology, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States of America
| | - Ece Özdemir
- Department of Materials Science and Engineering and Institute for NanoBioTechnology, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States of America
| | - Kalina Hristova
- Department of Materials Science and Engineering and Institute for NanoBioTechnology, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States of America.
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2
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Abouelkheir M, Roy T, Krzyscik MA, Özdemir E, Hristova K. Investigations of membrane protein interactions in cells using fluorescence microscopy. Curr Opin Struct Biol 2024; 86:102816. [PMID: 38648680 PMCID: PMC11141325 DOI: 10.1016/j.sbi.2024.102816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 03/06/2024] [Accepted: 03/26/2024] [Indexed: 04/25/2024]
Abstract
The interactions between proteins in membranes govern many cellular functions. Our ability to probe for such interactions has greatly evolved in recent years due to the introduction of new fluorescence techniques. As a result, we currently have a choice of methods that can be used to assess the spatial distribution of a membrane protein, its association state, and the thermodynamic stability of the oligomers in the native milieu. These biophysical measurements have revealed new insights into important biological processes in cellular membranes.
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Affiliation(s)
- Mahmoud Abouelkheir
- Department of Materials Science and Engineering and Institute for NanoBioTechnology, Johns Hopkins University, Baltimore MD 21218, USA; Chemistry-Biology Interface Program, Johns Hopkins University, Baltimore MD 21218, USA
| | - Tanaya Roy
- Department of Materials Science and Engineering and Institute for NanoBioTechnology, Johns Hopkins University, Baltimore MD 21218, USA
| | - Mateusz A Krzyscik
- Department of Materials Science and Engineering and Institute for NanoBioTechnology, Johns Hopkins University, Baltimore MD 21218, USA
| | - Ece Özdemir
- Department of Materials Science and Engineering and Institute for NanoBioTechnology, Johns Hopkins University, Baltimore MD 21218, USA
| | - Kalina Hristova
- Department of Materials Science and Engineering and Institute for NanoBioTechnology, Johns Hopkins University, Baltimore MD 21218, USA; Chemistry-Biology Interface Program, Johns Hopkins University, Baltimore MD 21218, USA.
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3
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Gladkauskas T, Bruland O, Abu Safieh L, Edward DP, Rødahl E, Bredrup C. Corneal Vascularization Associated With a Novel PDGFRB Variant. Invest Ophthalmol Vis Sci 2023; 64:9. [PMID: 37934158 PMCID: PMC10631511 DOI: 10.1167/iovs.64.14.9] [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: 04/27/2023] [Accepted: 10/16/2023] [Indexed: 11/08/2023] Open
Abstract
Purpose The purpose of this study was to identify the genetic cause of aggressive corneal vascularization in otherwise healthy children in one family. Further, to study molecular consequences associated with the identified variant and implications for possible treatment. Methods Exome sequencing was performed in affected individuals. HeLa cells were transduced with the identified c.1643C>A, p.(Ser548Tyr) variant in the platelet-derived growth factor receptor beta gene (PDGFRB) or wild-type PDGFRB. ELISA and immunoblot analysis were used to detect the phosphorylation levels of PDGFRβ and downstream signaling proteins in untreated and ligand-stimulated cells. Sensitivity to various receptor tyrosine kinase inhibitors (TKIs) was determined. Results A novel c.1643C>A, p.(Ser548Tyr) PDGFRB variant was found in affected family members. HeLa cells transduced with this variant did not have increased baseline levels of phosphorylated PDGFRβ. However, upon stimulation with ligand, excessive activation of PDGFRβ was observed compared to cells transduced with the wild-type variant. PDGFRβ with the p.(Ser548Tyr) amino acid substitution was successfully inhibited with tyrosine kinase inhibitors (axitinib, dasatinib, imatinib, and sunitinib) in vitro. Conclusions A novel c.1643C>A, p.(Ser548Tyr) PDGFRB variant was found in family members with isolated corneal vascularization. Cells transduced with the newly identified variant showed increased phosphorylation of PDGFRβ upon ligand stimulation. This suggests that PDGF-PDGFRβ signaling in these patients leads to overactivation of PDGFRβ, which could lead to abnormal wound healing of the cornea. The examined TKIs prevented such overactivation, introducing the possibility for targeted treatment in these patients.
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Affiliation(s)
- Titas Gladkauskas
- Department of Clinical Medicine, University of Bergen, Bergen, Norway
| | - Ove Bruland
- Department of Medical Genetics, Haukeland University Hospital, Bergen, Norway
| | - Leen Abu Safieh
- Research Department, King Khaled Eye Specialist Hospital, Riyadh, Kingdom of Saudi Arabia
- Bioinformatics and Computational Biology Department, Research Center, King Fahad Medical City, Riyadh, Kingdom of Saudi Arabia
| | - Deepak P. Edward
- Research Department, King Khaled Eye Specialist Hospital, Riyadh, Kingdom of Saudi Arabia
- Department of Ophthalmology and Visual Sciences, University of Illinois College of Medicine, Chicago, Illinois, United States
- Department of Ophthalmology, Loyola University College of Medicine, Chicago, Illinois, United States
| | - Eyvind Rødahl
- Department of Clinical Medicine, University of Bergen, Bergen, Norway
- Department of Ophthalmology, Haukeland University Hospital, Bergen, Norway
| | - Cecilie Bredrup
- Department of Clinical Medicine, University of Bergen, Bergen, Norway
- Department of Ophthalmology, Haukeland University Hospital, Bergen, Norway
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4
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McKenzie DM, Wirth D, Pogorelov TV, Hristova K. Utility of FRET in studies of membrane protein oligomerization: The concept of the effective dissociation constant. Biophys J 2023; 122:4113-4120. [PMID: 37735871 PMCID: PMC10598290 DOI: 10.1016/j.bpj.2023.09.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2023] [Revised: 08/07/2023] [Accepted: 09/18/2023] [Indexed: 09/23/2023] Open
Abstract
The activity of many membrane receptors is controlled through their lateral association into dimers or higher-order oligomers. Although Förster resonance energy transfer (FRET) measurements have been used extensively to characterize the stability of receptor dimers, the utility of FRET in studies of larger oligomers has been limited. Here we introduce an effective equilibrium dissociation constant that can be extracted from FRET measurements for EphA2, a receptor tyrosine kinase (RTK) known to form active oligomers of heterogeneous distributions in response to its ligand ephrinA1-Fc. The newly introduced effective equilibrium dissociation constant has a well-defined physical meaning and biological significance. It denotes the receptor concentration for which half of the receptors are monomeric and inactive, and the other half are associated into oligomers and are active, irrespective of the exact oligomer size. This work introduces a new dimension to the utility of FRET in studies of membrane receptor association and signaling in the plasma membrane.
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Affiliation(s)
- Daniel M McKenzie
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 Charles Street, Baltimore, Maryland
| | - Daniel Wirth
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 Charles Street, Baltimore, Maryland
| | - Taras V Pogorelov
- Department of Chemistry, Center for Biophysics and Quantitative Biology, School of Chemical Sciences, Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois
| | - Kalina Hristova
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 Charles Street, Baltimore, Maryland.
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5
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Proteome-Wide Detection and Annotation of Receptor Tyrosine Kinases (RTKs): RTK-PRED and the TyReK Database. Biomolecules 2023; 13:biom13020270. [PMID: 36830638 PMCID: PMC9953206 DOI: 10.3390/biom13020270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 01/16/2023] [Accepted: 01/28/2023] [Indexed: 02/04/2023] Open
Abstract
Receptor tyrosine kinases (RTKs) form a highly important group of protein receptors of the eukaryotic cell membrane. They control many vital cellular functions and are involved in the regulation of complex signaling networks. Mutations in RTKs have been associated with different types of cancers and other diseases. Although they are very important for proper cell function, they have been experimentally studied in a limited range of eukaryotic species. Currently, there is no available database for RTKs providing information about their function, expression, and interactions. Therefore, the identification of RTKs in multiple organisms, the documentation of their characteristics, and the collection of related information would be very useful. In this paper, we present a novel RTK detection pipeline (RTK-PRED) and the Receptor Tyrosine Kinases Database (TyReK-DB). RTK-PRED combines profile HMMs with transmembrane topology prediction to identify and classify potential RTKs. Proteins of all eukaryotic reference proteomes of the UniProt database were used as input in RTK-PRED leading to a filtered dataset of 20,478 RTKs. Based on the information collected for these RTKs from multiple databases, the relational TyReK database was created.
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6
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Wang J, Song J, Zhang X, Wang SM, Kang B, Li XL, Chen HY, Xu JJ. DNA-Programed Plasmon Rulers Decrypt Single-Receptor Dimerization on Cell Membrane. J Am Chem Soc 2023; 145:1273-1284. [PMID: 36621951 DOI: 10.1021/jacs.2c11201] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Decrypting the dynamics of receptor dimerization on cell membranes bears great importance in identifying the mechanisms regulating diverse cellular activities. In this regard, long-term monitoring of single-molecule behavior during receptor dimerization allows deepening insight into the dimerization process and tracking of the behavior of individual receptors, yet this remains to be realized. Herein, real-time observation of the receptor tyrosine kinases family (RTKs) at single-molecule level based on plasmon rulers was achieved for the first time, which enabled precise regulation and dynamic monitoring of the dimerization process by DNA programming with excellent photostability. Additionally, those nanoprobes demonstrated substantial application in the regulation of RTKs protein dimerization/phosphorylation and activation of downstream signaling pathways. The proposed nanoprobes hold considerable potential for elucidating the molecular mechanisms of single-receptor dimerization as well as the conformational transitions upon dimerization, providing a new paradigm for the precise manipulation and monitoring of specific single-receptor crosslink events in biological systems.
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Affiliation(s)
- Jin Wang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Juan Song
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Xian Zhang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Shu-Min Wang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Bin Kang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Xiang-Ling Li
- College of Life Science and Pharmaceutical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Hong-Yuan Chen
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
| | - Jing-Juan Xu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210023, China
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7
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Wirth D, McCall A, Hristova K. Neural network strategies for plasma membrane selection in fluorescence microscopy images. Biophys J 2021; 120:2374-2385. [PMID: 33961865 PMCID: PMC8390876 DOI: 10.1016/j.bpj.2021.04.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/21/2021] [Accepted: 04/29/2021] [Indexed: 10/21/2022] Open
Abstract
In recent years, there has been an explosion of fluorescence microscopy studies of live cells in the literature. The analysis of the images obtained in these studies often requires labor-intensive manual annotation to extract meaningful information. In this study, we explore the utility of a neural network approach to recognize, classify, and select plasma membranes in high-resolution images, thus greatly speeding up data analysis and reducing the need for personnel training for highly repetitive tasks. Two different strategies are tested: 1) a semantic segmentation strategy, and 2) a sequential application of an object detector followed by a semantic segmentation network. Multiple network architectures are evaluated for each strategy, and the best performing solutions are combined and implemented in the Recognition Of Cellular Membranes software. We show that images annotated manually and with the Recognition Of Cellular Membranes software yield identical results by comparing Förster resonance energy transfer binding curves for the membrane protein fibroblast growth factor receptor 3. The approach that we describe in this work can be applied to other image selection tasks in cell biology.
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Affiliation(s)
- Daniel Wirth
- Department of Materials Science and Engineering, Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, Maryland
| | - Alec McCall
- Department of Materials Science and Engineering, Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, Maryland
| | - Kalina Hristova
- Department of Materials Science and Engineering, Institute for NanoBioTechnology, Johns Hopkins University, Baltimore, Maryland.
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8
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Interactions between Ligand-Bound EGFR and VEGFR2. J Mol Biol 2021; 433:167006. [PMID: 33891904 DOI: 10.1016/j.jmb.2021.167006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 03/25/2021] [Accepted: 04/15/2021] [Indexed: 11/21/2022]
Abstract
In this work, we put forward the provocative hypothesis that the active, ligand-bound RTK dimers from unrelated subfamilies can associate into heterooligomers with novel signaling properties. This hypothesis is based on a quantitative FRET study that monitors the interactions between EGFR and VEGFR2 in the plasma membrane of live cells in the absence of ligand, in the presence of either EGF or VEGF, and in the presence of both ligands. We show that direct interactions occur between EGFR and VEGFR2 in the absence of ligand and in the presence of the two cognate ligands. However, there are not significant heterointeractions between EGFR and VEGFR2 when only one of the ligands is present. Since RTK dimers and RTK oligomers are believed to signal differently, this finding suggests a novel mechanism for signal diversification.
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9
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Kazi JU, Rönnstrand L. FMS-like Tyrosine Kinase 3/FLT3: From Basic Science to Clinical Implications. Physiol Rev 2019; 99:1433-1466. [PMID: 31066629 DOI: 10.1152/physrev.00029.2018] [Citation(s) in RCA: 103] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
FMS-like tyrosine kinase 3 (FLT3) is a receptor tyrosine kinase that is expressed almost exclusively in the hematopoietic compartment. Its ligand, FLT3 ligand (FL), induces dimerization and activation of its intrinsic tyrosine kinase activity. Activation of FLT3 leads to its autophosphorylation and initiation of several signal transduction cascades. Signaling is initiated by the recruitment of signal transduction molecules to activated FLT3 through binding to specific phosphorylated tyrosine residues in the intracellular region of FLT3. Activation of FLT3 mediates cell survival, cell proliferation, and differentiation of hematopoietic progenitor cells. It acts in synergy with several other cytokines to promote its biological effects. Deregulated FLT3 activity has been implicated in several diseases, most prominently in acute myeloid leukemia where around one-third of patients carry an activating mutant of FLT3 which drives the disease and is correlated with poor prognosis. Overactivity of FLT3 has also been implicated in autoimmune diseases, such as rheumatoid arthritis. The observation that gain-of-function mutations of FLT3 can promote leukemogenesis has stimulated the development of inhibitors that target this receptor. Many of these are in clinical trials, and some have been approved for clinical use. However, problems with acquired resistance to these inhibitors are common and, furthermore, only a fraction of patients respond to these selective treatments. This review provides a summary of our current knowledge regarding structural and functional aspects of FLT3 signaling, both under normal and pathological conditions, and discusses challenges for the future regarding the use of targeted inhibition of these pathways for the treatment of patients.
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Affiliation(s)
- Julhash U Kazi
- Division of Translational Cancer Research, Department of Laboratory Medicine, Lund University , Lund , Sweden ; Lund Stem Cell Center, Department of Laboratory Medicine, Lund University , Lund , Sweden ; and Division of Oncology, Skåne University Hospital , Lund , Sweden
| | - Lars Rönnstrand
- Division of Translational Cancer Research, Department of Laboratory Medicine, Lund University , Lund , Sweden ; Lund Stem Cell Center, Department of Laboratory Medicine, Lund University , Lund , Sweden ; and Division of Oncology, Skåne University Hospital , Lund , Sweden
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10
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Singh DR, King C, Salotto M, Hristova K. Revisiting a controversy: The effect of EGF on EGFR dimer stability. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2019; 1862:183015. [PMID: 31295474 DOI: 10.1016/j.bbamem.2019.07.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Revised: 06/23/2019] [Accepted: 07/02/2019] [Indexed: 12/26/2022]
Abstract
EGFR is a receptor tyrosine kinase that plays a critical role in cell proliferation, differentiation, survival and migration. Its activating ligand, EGF, has long been believed to stabilize the EGFR dimer. Two research studies aimed at quantitative measurements of EGFR dimerization, however, have led to contradicting conclusions and have questioned this view. Given the controversy, here we sought to measure the dimerization of EGFR in the absence and in the presence of saturating EGF concentrations, and to tease out the effect of ligand on dimer stability, using a FRET-based quantitative method. Our measurements show that the dissociation constant is decreased ~150 times due to ligand binding, indicative of significant dimer stabilization. In addition, our measurements demonstrate that EGF binding induces a conformational change in the EGFR dimer.
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Affiliation(s)
- Deo R Singh
- Institute of NanoBioTechnology, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States of America; Department of Materials Science and Engineering, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States of America
| | - Christopher King
- Institute of NanoBioTechnology, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States of America; Program in Molecular Biophysics, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States of America
| | - Matt Salotto
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States of America
| | - Kalina Hristova
- Institute of NanoBioTechnology, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States of America; Department of Materials Science and Engineering, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States of America; Program in Molecular Biophysics, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States of America.
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11
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King C, Hristova K. Direct measurements of VEGF–VEGFR2 binding affinities reveal the coupling between ligand binding and receptor dimerization. J Biol Chem 2019; 294:9064-9075. [DOI: 10.1074/jbc.ra119.007737] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2019] [Revised: 04/05/2019] [Indexed: 01/13/2023] Open
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12
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Abstract
Receptor tyrosine kinases (RTKs) play important roles in cell growth, motility, differentiation, and survival. These single-pass membrane proteins are grouped into subfamilies based on the similarity of their extracellular domains. They are generally thought to be activated by ligand binding, which promotes homodimerization and then autophosphorylation in trans. However, RTK interactions are more complicated, as RTKs can interact in the absence of ligand and heterodimerize within and across subfamilies. Here, we review the known cross-subfamily RTK heterointeractions and their possible biological implications, as well as the methodologies which have been used to study them. Moreover, we demonstrate how thermodynamic models can be used to study RTKs and to explain many of the complicated biological effects which have been described in the literature. Finally, we discuss the concept of the RTK interactome: a putative, extensive network of interactions between the RTKs. This RTK interactome can produce unique signaling outputs; can amplify, inhibit, and modify signaling; and can allow for signaling backups. The existence of the RTK interactome could provide an explanation for the irreproducibility of experimental data from different studies and for the failure of some RTK inhibitors to produce the desired therapeutic effects. We argue that a deeper knowledge of RTK interactome thermodynamics can lead to a better understanding of fundamental RTK signaling processes in health and disease. We further argue that there is a need for quantitative, thermodynamic studies that probe the strengths of the interactions between RTKs and their ligands and between different RTKs.
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Affiliation(s)
- Michael D. Paul
- Department of Materials Science and Engineering, Institute for NanoBioTechnology, and Program in Molecular Biophysics, Johns Hopkins University, Baltimore MD 21218
| | - Kalina Hristova
- Department of Materials Science and Engineering, Institute for NanoBioTechnology, and Program in Molecular Biophysics, Johns Hopkins University, Baltimore MD 21218
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13
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Dimerization of the Trk receptors in the plasma membrane: effects of their cognate ligands. Biochem J 2018; 475:3669-3685. [PMID: 30366959 DOI: 10.1042/bcj20180637] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Revised: 10/23/2018] [Accepted: 10/26/2018] [Indexed: 12/18/2022]
Abstract
Receptor tyrosine kinases (RTKs) are cell surface receptors which control cell growth and differentiation, and play important roles in tumorigenesis. Despite decades of RTK research, the mechanism of RTK activation in response to their ligands is still under debate. Here, we investigate the interactions that control the activation of the tropomyosin receptor kinase (Trk) family of RTKs in the plasma membrane, using a FRET-based methodology. The Trk receptors are expressed in neuronal tissues, and guide the development of the central and peripheral nervous systems during development. We quantify the dimerization of human Trk-A, Trk-B, and Trk-C in the absence and presence of their cognate ligands: human β-nerve growth factor, human brain-derived neurotrophic factor, and human neurotrophin-3, respectively. We also assess conformational changes in the Trk dimers upon ligand binding. Our data support a model of Trk activation in which (1) Trks have a propensity to interact laterally and to form dimers even in the absence of ligand, (2) different Trk unliganded dimers have different stabilities, (3) ligand binding leads to Trk dimer stabilization, and (4) ligand binding induces structural changes in the Trk dimers which propagate to their transmembrane and intracellular domains. This model, which we call the 'transition model of RTK activation,' may hold true for many other RTKs.
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14
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Jacob L, Sawma P, Garnier N, Meyer LAT, Fritz J, Hussenet T, Spenlé C, Goetz J, Vermot J, Fernandez A, Baumlin N, Aci-Sèche S, Orend G, Roussel G, Crémel G, Genest M, Hubert P, Bagnard D. Inhibition of PlexA1-mediated brain tumor growth and tumor-associated angiogenesis using a transmembrane domain targeting peptide. Oncotarget 2018; 7:57851-57865. [PMID: 27506939 PMCID: PMC5295395 DOI: 10.18632/oncotarget.11072] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 07/21/2016] [Indexed: 11/25/2022] Open
Abstract
The neuropilin-plexin receptor complex regulates tumor cell migration and proliferation and thus is an interesting therapeutic target. High expression of neuropilin-1 is indeed associated with a bad prognosis in glioma patients. Q-RTPCR and tissue-array analyses showed here that Plexin-A1 is highly expressed in glioblastoma and that the highest level of expression correlates with the worse survival of patients. We next identified a developmental and tumor-associated pro-angiogenic role of Plexin-A1. Hence, by using molecular simulations and a two-hybrid like assay in parallel with biochemical and cellular assays we developed a specific Plexin-A1 peptidic antagonist disrupting transmembrane domain-mediated oligomerization of the receptor and subsequent signaling and functional activity. We found that this peptide exhibits anti-tumor activity in vivo on different human glioblastoma models including glioma cancer stem cells. Thus, screening Plexin-A1 expression and targeting Plexin-A1 in glioblastoma patients exhibit diagnostic and therapeutic value.
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Affiliation(s)
- Laurent Jacob
- MN3T Team, INSERM U1109, Strasbourg, France.,Université de Strasbourg, Strasbourg, France.,LabEx Medalis, Université de Strasbourg, Strasbourg, France.,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Paul Sawma
- Laboratoire d’Ingénierie des Systèmes Macromoléculaires (LISM), UMR 7255, CNRS-Aix Marseille Université, Marseille, France
| | - Norbert Garnier
- Centre de Biophysique Moléculaire, UPR 4301, CNRS, Affiliated to the University of Orléans, Orléans, France
| | - Lionel A T Meyer
- MN3T Team, INSERM U1109, Strasbourg, France.,Université de Strasbourg, Strasbourg, France.,LabEx Medalis, Université de Strasbourg, Strasbourg, France.,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Justine Fritz
- MN3T Team, INSERM U1109, Strasbourg, France.,Université de Strasbourg, Strasbourg, France.,LabEx Medalis, Université de Strasbourg, Strasbourg, France.,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Thomas Hussenet
- MN3T Team, INSERM U1109, Strasbourg, France.,Université de Strasbourg, Strasbourg, France.,LabEx Medalis, Université de Strasbourg, Strasbourg, France.,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Caroline Spenlé
- MN3T Team, INSERM U1109, Strasbourg, France.,Université de Strasbourg, Strasbourg, France.,LabEx Medalis, Université de Strasbourg, Strasbourg, France.,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Jacky Goetz
- MN3T Team, INSERM U1109, Strasbourg, France.,Université de Strasbourg, Strasbourg, France.,LabEx Medalis, Université de Strasbourg, Strasbourg, France.,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France.,Institute of Genetics and Molecular and Cellular Biology (IGBMC), CNRS/INSERM/UDS, Illkirch, France
| | - Julien Vermot
- Institute of Genetics and Molecular and Cellular Biology (IGBMC), CNRS/INSERM/UDS, Illkirch, France
| | - Aurore Fernandez
- MN3T Team, INSERM U1109, Strasbourg, France.,Université de Strasbourg, Strasbourg, France.,LabEx Medalis, Université de Strasbourg, Strasbourg, France.,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Nadège Baumlin
- MN3T Team, INSERM U1109, Strasbourg, France.,Université de Strasbourg, Strasbourg, France.,LabEx Medalis, Université de Strasbourg, Strasbourg, France.,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Samia Aci-Sèche
- Centre de Biophysique Moléculaire, UPR 4301, CNRS, Affiliated to the University of Orléans, Orléans, France.,Current address: Institut de Chimie Organique et Analytique UMR, Université d'Orléans, Orléans, France
| | - Gertraud Orend
- MN3T Team, INSERM U1109, Strasbourg, France.,Université de Strasbourg, Strasbourg, France.,LabEx Medalis, Université de Strasbourg, Strasbourg, France.,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Guy Roussel
- MN3T Team, INSERM U1109, Strasbourg, France.,Université de Strasbourg, Strasbourg, France.,LabEx Medalis, Université de Strasbourg, Strasbourg, France.,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Gérard Crémel
- MN3T Team, INSERM U1109, Strasbourg, France.,Université de Strasbourg, Strasbourg, France.,LabEx Medalis, Université de Strasbourg, Strasbourg, France.,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
| | - Monique Genest
- Centre de Biophysique Moléculaire, UPR 4301, CNRS, Affiliated to the University of Orléans, Orléans, France
| | - Pierre Hubert
- Laboratoire d’Ingénierie des Systèmes Macromoléculaires (LISM), UMR 7255, CNRS-Aix Marseille Université, Marseille, France
| | - Dominique Bagnard
- MN3T Team, INSERM U1109, Strasbourg, France.,Université de Strasbourg, Strasbourg, France.,LabEx Medalis, Université de Strasbourg, Strasbourg, France.,Fédération de Médecine Translationnelle de Strasbourg (FMTS), Strasbourg, France
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15
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Bocharov EV. Alternative dimerization of receptor tyrosine kinases with signal transduction through a cellular membrane. RUSSIAN JOURNAL OF BIOORGANIC CHEMISTRY 2017. [DOI: 10.1134/s1068162017050041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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16
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Conformational transitions and interactions underlying the function of membrane embedded receptor protein kinases. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2017; 1859:1417-1429. [DOI: 10.1016/j.bbamem.2017.01.025] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Revised: 01/06/2017] [Accepted: 01/09/2017] [Indexed: 01/08/2023]
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17
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Emmanouilidi A, Lattanzio R, Sala G, Piantelli M, Falasca M. The role of phospholipase Cγ1 in breast cancer and its clinical significance. Future Oncol 2017; 13:1991-1997. [DOI: 10.2217/fon-2017-0125] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Breast cancer, the most common malignancy among women, is usually detected at an early stage and has a low risk of relapse. Nevertheless, a significant number of patients cannot be cured solely by local treatment. Distinguishing between patients who are of low risk of relapse from those who are of high risk may have important implications to improve treatment outcomes. The PLC-γ1 signaling pathway promotes many physiological processes, including cell migration and invasion. Increasing evidence shows aberrant PLC-γ1 signaling implication in carcinogenesis including breast cancer. In this review, the role of PLC-γ1 in breast cancer and its clinical implications will be discussed, as well as its potential as a prognostic factor and a therapeutic target.
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Affiliation(s)
- Aikaterini Emmanouilidi
- Curtin Health Innovation Research Institute, School of Biomedical Sciences, Curtin University, Perth, Western Australia, Australia
| | - Rossano Lattanzio
- Department of Medical, Oral & Biotechnological Sciences, G. d'Annunzio University, Chieti, Italy
| | - Gianluca Sala
- Department of Medical, Oral & Biotechnological Sciences, G. d'Annunzio University, Chieti, Italy
| | - Mauro Piantelli
- Department of Medical, Oral & Biotechnological Sciences, G. d'Annunzio University, Chieti, Italy
| | - Marco Falasca
- Curtin Health Innovation Research Institute, School of Biomedical Sciences, Curtin University, Perth, Western Australia, Australia
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18
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Del Piccolo N, Hristova K. Quantifying the Interaction between EGFR Dimers and Grb2 in Live Cells. Biophys J 2017; 113:1353-1364. [PMID: 28734476 DOI: 10.1016/j.bpj.2017.06.029] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Revised: 05/19/2017] [Accepted: 06/12/2017] [Indexed: 12/21/2022] Open
Abstract
Adaptor proteins are a class of cytoplasmic proteins that bind to phosphorylated residues in receptor tyrosine kinases and trigger signaling cascades that control critically important cellular processes, such as cell survival, growth, differentiation, and motility. Here, we seek to characterize the interaction between epidermal growth factor receptor (EGFR) and the cytoplasmic adaptor protein growth factor receptor-bound protein 2 (Grb2) in a cellular context. To do so, we explore the utility of a highly biologically relevant model system, mammalian cells under reversible osmotic stress, and a recently introduced Förster resonance energy transfer microscopy method, fully quantified spectral imaging. We present a method that allows us to quantify the stoichiometry and the association constant of the EGFR-Grb2 binding interaction in the plasma membrane, in the presence and absence of activating ligand. The method that we introduce can have broad utility in membrane protein research, as it can be applied to different membrane protein-cytoplasmic protein pairs.
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Affiliation(s)
- Nuala Del Piccolo
- Department of Materials Science and Engineering and Institute for NanoBio Technology, Johns Hopkins University, Baltimore, Maryland
| | - Kalina Hristova
- Department of Materials Science and Engineering and Institute for NanoBio Technology, Johns Hopkins University, Baltimore, Maryland.
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19
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King C, Raicu V, Hristova K. Understanding the FRET Signatures of Interacting Membrane Proteins. J Biol Chem 2017; 292:5291-5310. [PMID: 28188294 DOI: 10.1074/jbc.m116.764282] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 02/07/2017] [Indexed: 12/30/2022] Open
Abstract
FRET is an indispensable experimental tool for studying membrane proteins. Currently, two models are available for researchers to determine the oligomerization state of membrane proteins in a static quenching FRET experiment: the model of Veatch and Stryer, derived in 1977, and the kinetic theory-based model for intraoligomeric FRET, derived in 2007. Because of confinement in two dimensions, a substantial amount of FRET is generated by energy transfer between fluorophores located in separate oligomers in the two-dimensional bilayer. This interoligomeric FRET (also known as stochastic, bystander, or proximity FRET) is not accounted for in either model. Here, we use the kinetic theory formalism to describe the dependence of the FRET efficiency measured in an experiment (i.e. the "total apparent FRET efficiency") on the interoligomeric FRET due to random proximity within the bilayer and the intraoligomeric FRET resulting from protein-protein interactions. We find that data analysis with both models without consideration of the proximity FRET leads to incorrect conclusions about the oligomeric state of the protein. We show that knowledge of the total surface densities of fluorophore-labeled membrane proteins is essential for correctly interpreting the measured total apparent FRET efficiency. We also find that bulk, two-color, static quenching FRET experiments are best suited for the study of monomeric, dimerizing, or dimeric proteins but have limitations in discerning the order of larger oligomers. The theory and methodology described in this work will allow researchers to extract meaningful parameters from static quenching FRET measurements in biological membranes.
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Affiliation(s)
- Christopher King
- the Program in Molecular Biophysics, Johns Hopkins University, Baltimore, Maryland 21218 and
| | - Valerica Raicu
- the Department of Physics, University of Wisconsin, Milwaukee, Wisconsin 53211
| | - Kalina Hristova
- the Program in Molecular Biophysics, Johns Hopkins University, Baltimore, Maryland 21218 and .,From the Department of Materials Science and Engineering and
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20
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The Role of PDGFs and PDGFRs in Colorectal Cancer. Mediators Inflamm 2017; 2017:4708076. [PMID: 28163397 PMCID: PMC5259650 DOI: 10.1155/2017/4708076] [Citation(s) in RCA: 84] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Revised: 11/04/2016] [Accepted: 12/08/2016] [Indexed: 01/06/2023] Open
Abstract
Introduction. Colorectal cancer (CRC) is an important cause of morbidity and mortality worldwide. Angiogenesis was reported as one important mechanism activated in colorectal carcinogenesis. Tumor microenvironment associated angiogenesis involves a large spectrum of signaling molecules and deciphering their role in colorectal carcinogenesis still represents a major challenge. The aim of our study is to point out the diagnosis and prediction role of PDGF family and their receptors in colorectal carcinogenesis. Material and Methods. A systematic search in Medline and PubMed for studies reporting the role of platelet-derived growth factors (PDGFs) and their receptors (PDGFRs) in tumor biology related to CRC was made. Results. PDGFs are important growth factors for normal tissue growth and division, with an important role in blood vessel formation. PDGFs/PDGFRs signaling pathway has been demonstrated to be involved in angiogenesis mainly by targeting pericytes and vascular smooth muscle cells. High levels of PDGF-BB were reported in CRC patients compared to those with adenomas, while elevated levels of PDGFR α/β in the stroma of CRC patients were correlated with invasion and metastasis. Moreover, PDGF-AB and PDGF-C were correlated with early diagnosis, cancer grading, and metastatic disease. Conclusions. Both PDGFs and PDGFRs families play an important role in colorectal carcinogenesis and could be considered to be investigated as useful biomarkers both for diagnosis and treatment of CRC.
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21
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Del Piccolo N, Sarabipour S, Hristova K. A New Method to Study Heterodimerization of Membrane Proteins and Its Application to Fibroblast Growth Factor Receptors. J Biol Chem 2016; 292:1288-1301. [PMID: 27927983 DOI: 10.1074/jbc.m116.755777] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2016] [Revised: 12/05/2016] [Indexed: 12/30/2022] Open
Abstract
The activity of receptor tyrosine kinases (RTKs) is controlled through their lateral association in the plasma membrane. RTKs are believed to form both homodimers and heterodimers, and the different dimers are believed to play unique roles in cell signaling. However, RTK heterodimers remain poorly characterized, as compared with homodimers, because of limitations in current experimental methods. Here, we develop a FRET-based methodology to assess the thermodynamics of hetero-interactions in the plasma membrane. To demonstrate the utility of the methodology, we use it to study the hetero-interactions between three fibroblast growth factor receptors-FGFR1, FGFR2, and FGFR3-in the absence of ligand. Our results show that all possible FGFR heterodimers form, suggesting that the biological roles of FGFR heterodimers may be as significant as the homodimer roles. We further investigate the effect of two pathogenic point mutations in FGFR3 (A391E and G380R) on heterodimerization. We show that each of these mutations stabilize most of the heterodimers, with the largest effects observed for FGFR3 wild-type/mutant heterodimers. We thus demonstrate that the methodology presented here can yield new knowledge about RTK interactions and can further our understanding of signal transduction across the plasma membrane.
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Affiliation(s)
- Nuala Del Piccolo
- From the Department of Materials Science & Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
| | - Sarvenaz Sarabipour
- From the Department of Materials Science & Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
| | - Kalina Hristova
- From the Department of Materials Science & Engineering, The Johns Hopkins University, Baltimore, Maryland 21218
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22
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Bocharov EV, Mineev KS, Pavlov KV, Akimov SA, Kuznetsov AS, Efremov RG, Arseniev AS. Helix-helix interactions in membrane domains of bitopic proteins: Specificity and role of lipid environment. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1859:561-576. [PMID: 27884807 DOI: 10.1016/j.bbamem.2016.10.024] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 09/18/2016] [Accepted: 10/20/2016] [Indexed: 12/23/2022]
Abstract
Interaction between transmembrane helices often determines biological activity of membrane proteins. Bitopic proteins, a broad subclass of membrane proteins, form dimers containing two membrane-spanning helices. Some aspects of their structure-function relationship cannot be fully understood without considering the protein-lipid interaction, which can determine the protein conformational ensemble. Experimental and computer modeling data concerning transmembrane parts of bitopic proteins are reviewed in the present paper. They highlight the importance of lipid-protein interactions and resolve certain paradoxes in the behavior of such proteins. Besides, some properties of membrane organization provided a clue to understanding of allosteric interactions between distant parts of proteins. Interactions of these kinds appear to underlie a signaling mechanism, which could be widely employed in the functioning of many membrane proteins. Treatment of membrane proteins as parts of integrated fine-tuned proteolipid system promises new insights into biological function mechanisms and approaches to drug design. This article is part of a Special Issue entitled: Lipid order/lipid defects and lipid-control of protein activity edited by Dirk Schneider.
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Affiliation(s)
- Eduard V Bocharov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya ul. 16/10, Moscow, 117997, Russian Federation; National Research Centre "Kurchatov Institute", Akad. Kurchatova pl. 1, Moscow, 123182, Russian Federation.
| | - Konstantin S Mineev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya ul. 16/10, Moscow, 117997, Russian Federation
| | - Konstantin V Pavlov
- Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninskiy prospect 31/5, Moscow, 119071, Russian Federation
| | - Sergey A Akimov
- Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Leninskiy prospect 31/5, Moscow, 119071, Russian Federation; National University of Science and Technology "MISiS", Leninskiy prospect 4, Moscow, 119049, Russian Federation
| | - Andrey S Kuznetsov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya ul. 16/10, Moscow, 117997, Russian Federation
| | - Roman G Efremov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya ul. 16/10, Moscow, 117997, Russian Federation; Higher School of Economics, Myasnitskaya ul. 20, Moscow, 101000, Russian Federation
| | - Alexander S Arseniev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya ul. 16/10, Moscow, 117997, Russian Federation.
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23
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Bleymüller WM, Lämmermann N, Ebbes M, Maynard D, Geerds C, Niemann HH. MET-activating Residues in the B-repeat of the Listeria monocytogenes Invasion Protein InlB. J Biol Chem 2016; 291:25567-25577. [PMID: 27789707 DOI: 10.1074/jbc.m116.746685] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 10/26/2016] [Indexed: 12/20/2022] Open
Abstract
The facultative intracellular pathogen Listeria monocytogenes causes listeriosis, a rare but life-threatening disease. Host cell entry begins with activation of the human receptor tyrosine kinase MET through the bacterial invasion protein InlB, which contains an internalin domain, a B-repeat, and three GW domains. The internalin domain is known to bind MET, but no interaction partner is known for the B-repeat. Adding the B-repeat to the internalin domain potentiates MET activation and is required to stimulate Madin-Darby canine kidney (MDCK) cell scatter. Therefore, it has been hypothesized that the B-repeat may bind a co-receptor on host cells. To test this hypothesis, we mutated residues that might be important for binding an interaction partner. We identified two adjacent residues in strand β2 of the β-grasp fold whose mutation abrogated induction of MDCK cell scatter. Biophysical analysis indicated that these mutations do not alter protein structure. We then tested these mutants in human HT-29 cells that, in contrast to the MDCK cells, were responsive to the internalin domain alone. These assays revealed a dominant negative effect, reducing the activity of a construct of the internalin domain and mutated B-repeat below that of the individual internalin domain. Phosphorylation assays of MET and its downstream targets AKT and ERK confirmed the dominant negative effect. Attempts to identify a host cell receptor for the B-repeat were not successful. We conclude that there is limited support for a co-receptor hypothesis and instead suggest that the B-repeat contributes to MET activation through low affinity homodimerization.
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Affiliation(s)
- Willem M Bleymüller
- From the Department of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
| | - Nina Lämmermann
- From the Department of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
| | - Maria Ebbes
- From the Department of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
| | - Daniel Maynard
- From the Department of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
| | - Christina Geerds
- From the Department of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
| | - Hartmut H Niemann
- From the Department of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
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24
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Singh DR, Ahmed F, Paul MD, Gedam M, Pasquale EB, Hristova K. The SAM domain inhibits EphA2 interactions in the plasma membrane. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2016; 1864:31-38. [PMID: 27776928 DOI: 10.1016/j.bbamcr.2016.10.011] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 09/26/2016] [Accepted: 10/18/2016] [Indexed: 11/18/2022]
Abstract
All members of the Eph receptor family of tyrosine kinases contain a SAM domain near the C terminus, which has been proposed to play a role in receptor homotypic interactions and/or interactions with binding partners. The SAM domain of EphA2 is known to be important for receptor function, but its contribution to EphA2 lateral interactions in the plasma membrane has not been determined. Here we use a FRET-based approach to directly measure the effect of the SAM domain on the stability of EphA2 dimers on the cell surface in the absence of ligand binding. We also investigate the functional consequences of EphA2 SAM domain deletion. Surprisingly, we find that the EphA2 SAM domain inhibits receptor dimerization and decreases EphA2 tyrosine phosphorylation. This role is dramatically different from the role of the SAM domain of the related EphA3 receptor, which we previously found to stabilize EphA3 dimers and increase EphA3 tyrosine phosphorylation in cells in the absence of ligand. Thus, the EphA2 SAM domain likely contributes to a unique mode of EphA2 interaction that leads to distinct signaling outputs.
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Affiliation(s)
- Deo R Singh
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States
| | - Fozia Ahmed
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States
| | - Michael D Paul
- Program in Molecular Biophysics, Johns Hopkins University, 3400 Charles street, Baltimore, MD 21218, United States
| | - Manasee Gedam
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States
| | - Elena B Pasquale
- Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Road, La Jolla, San Diego, CA 92037, United States
| | - Kalina Hristova
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States; Program in Molecular Biophysics, Johns Hopkins University, 3400 Charles street, Baltimore, MD 21218, United States.
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25
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Singh DR, Pasquale EB, Hristova K. A small peptide promotes EphA2 kinase-dependent signaling by stabilizing EphA2 dimers. Biochim Biophys Acta Gen Subj 2016; 1860:1922-8. [PMID: 27281300 DOI: 10.1016/j.bbagen.2016.06.004] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Revised: 05/31/2016] [Accepted: 06/03/2016] [Indexed: 12/01/2022]
Abstract
BACKGROUND The EphA2 receptor tyrosine kinase is known to promote cancer cell malignancy in the absence of activation by ephrin ligands. This behavior depends on high EphA2 phosphorylation on Ser897 and low tyrosine phosphorylation, resulting in increased cell migration and invasiveness. We have previously shown that EphA2 forms dimers in the absence of ephrin ligand binding, and that dimerization of unliganded EphA2 can decrease EphA2 Ser897 phosphorylation. We have also identified a small peptide called YSA, which binds EphA2 and competes with the naturally occurring ephrin ligands. METHODS Here, we investigate the effect of YSA on EphA2 dimer stability and EphA2 function using quantitative FRET techniques, Western blotting, and cell motility assays. RESULTS We find that the YSA peptide stabilizes the EphA2 dimer, increases EphA2 Tyr phosphorylation, and decreases both Ser897 phosphorylation and cell migration. CONCLUSIONS The experiments demonstrate that the small peptide ligand YSA reduces EphA2 Ser897 pro-tumorigenic signaling by stabilizing the EphA2 dimer. GENERAL SIGNIFICANCE This work is a proof-of-principle demonstration that EphA2 homointeractions in the plasma membrane can be pharmacologically modulated to decrease the pro-tumorigenic signaling of the receptor.
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Affiliation(s)
- Deo R Singh
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States
| | - Elena B Pasquale
- Sanford Burnham Prebys Medical Discovery Institute, 10901 North Torrey Road, La Jolla, San Diego, CA 92037, United States
| | - Kalina Hristova
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 Charles Street, Baltimore, MD 21218, United States.
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26
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Platelet-derived growth factor receptor/platelet-derived growth factor (PDGFR/PDGF) system is a prognostic and treatment response biomarker with multifarious therapeutic targets in cancers. Tumour Biol 2016; 37:10053-66. [PMID: 27193823 DOI: 10.1007/s13277-016-5069-z] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 05/05/2016] [Indexed: 02/06/2023] Open
Abstract
Progress in cancer biology has led to an increasing discovery of oncogenic alterations of the platelet-derived growth factor receptors (PDGFRs) in cancers. In addition, their overexpression in numerous cancers invariably makes PDGFRs and platelet-derived growth factors (PDGFs) prognostic and treatment markers in some cancers. The oncologic alterations of the PDGFR/PDGF system affect the extracellular, transmembrane and tyrosine kinase domains as well as the juxtamembrane segment of the receptor. The receptor is also involved in fusions with intracellular proteins and receptor tyrosine kinase. These discoveries undoubtedly make the system an attractive oncologic therapeutic target. This review covers elementary biology of PDGFR/PDGF system and its role as a prognostic and treatment marker in cancers. In addition, the multifarious therapeutic targets of PDGFR/PDGF system are discussed. Great potential exists in the role of PDGFR/PDGF system as a prognostic and treatment marker and for further exploration of its multifarious therapeutic targets in safe and efficacious management of cancer treatments.
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27
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Bocharov EV, Lesovoy DM, Pavlov KV, Pustovalova YE, Bocharova OV, Arseniev AS. Alternative packing of EGFR transmembrane domain suggests that protein-lipid interactions underlie signal conduction across membrane. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2016; 1858:1254-61. [PMID: 26903218 DOI: 10.1016/j.bbamem.2016.02.023] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2015] [Revised: 02/15/2016] [Accepted: 02/17/2016] [Indexed: 10/22/2022]
Abstract
The human epidermal growth factor receptor (EGFR) of HER/ErbB receptor tyrosine kinase family mediates a broad spectrum of cellular responses transducing biochemical signals via lateral dimerization in plasma membrane, while inactive receptors can exist in both monomeric and dimeric forms. Recently, the dimeric conformation of the helical single-span transmembrane domains of HER/ErbB employing the relatively polar N-terminal motifs in a fashion permitting proper kinase activation was experimentally determined. Here we describe the EGFR transmembrane domain dimerization via an alternative weakly polar C-terminal motif A(661)xxxG(665) presumably corresponding to the inactive receptor state. During association, the EGFR transmembrane helices undergo a structural adjustment with adaptation of inter-molecular polar and hydrophobic interactions depending upon the surrounding membrane properties that directly affect the transmembrane helix packing. This might imply that signal transduction through membrane and allosteric regulation are inclusively mediated by coupled protein-protein and protein-lipid interactions, elucidating paradoxically loose linkage between ligand binding and kinase activation.
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Affiliation(s)
- Eduard V Bocharov
- Department of Structural Biology, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, str. Miklukho-Maklaya 16/10, Moscow, 117997, Russian Federation.
| | - Dmitry M Lesovoy
- Department of Structural Biology, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, str. Miklukho-Maklaya 16/10, Moscow, 117997, Russian Federation
| | - Konstantin V Pavlov
- Department of Structural Biology, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, str. Miklukho-Maklaya 16/10, Moscow, 117997, Russian Federation
| | - Yulia E Pustovalova
- Department of Structural Biology, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, str. Miklukho-Maklaya 16/10, Moscow, 117997, Russian Federation
| | - Olga V Bocharova
- Department of Structural Biology, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, str. Miklukho-Maklaya 16/10, Moscow, 117997, Russian Federation
| | - Alexander S Arseniev
- Department of Structural Biology, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, str. Miklukho-Maklaya 16/10, Moscow, 117997, Russian Federation
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28
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Wang Y, Appiah-Kubi K, Wu M, Yao X, Qian H, Wu Y, Chen Y. The platelet-derived growth factors (PDGFs) and their receptors (PDGFRs) are major players in oncogenesis, drug resistance, and attractive oncologic targets in cancer. Growth Factors 2016; 34:64-71. [PMID: 27170215 DOI: 10.1080/08977194.2016.1180293] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The platelet-derived growth factors (PDGFs) and their receptors (PDGFRs) play a key role in signaling pathways in oncogenesis. The overexpression of PDGFs and PDGFRs and the oncogenic alterations of these receptors have been implicated in human cancers and correlated significantly with poor outcomes. This review discusses the biology of the PDGF isoforms and receptors briefly, and their role in oncogenesis. Also, the attractiveness of targeting PDGFs and PDGFRs, based on a wide display of oncologic alterations in cancers, diverse therapeutic strategies, their roles in resistance to cancer treatments with prospects of overcoming drug resistance, and the extent to which validated biomarkers have been developed for effective PDGFs and PDGFRs-based cancer management are discussed.
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Affiliation(s)
- Ying Wang
- a Department of Physiology , School of Medicine, Jiangsu University , Jiangsu , People's Republic of China
| | - Kwaku Appiah-Kubi
- a Department of Physiology , School of Medicine, Jiangsu University , Jiangsu , People's Republic of China
- b Department of Applied Biology , University for Development Studies , Navrongo , Ghana , and
| | - Min Wu
- a Department of Physiology , School of Medicine, Jiangsu University , Jiangsu , People's Republic of China
| | - Xiaoyuan Yao
- c Basic Medical Department, Changchun Medical College , Jilin , People's Republic of China
| | - Hai Qian
- a Department of Physiology , School of Medicine, Jiangsu University , Jiangsu , People's Republic of China
| | - Yan Wu
- a Department of Physiology , School of Medicine, Jiangsu University , Jiangsu , People's Republic of China
| | - Yongchang Chen
- a Department of Physiology , School of Medicine, Jiangsu University , Jiangsu , People's Republic of China
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29
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Sarabipour S, Del Piccolo N, Hristova K. Characterization of membrane protein interactions in plasma membrane derived vesicles with quantitative imaging Förster resonance energy transfer. Acc Chem Res 2015; 48:2262-9. [PMID: 26244699 PMCID: PMC4841635 DOI: 10.1021/acs.accounts.5b00238] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Here we describe an experimental tool, termed quantitative imaging Förster resonance energy transfer (QI-FRET), that enables the quantitative characterization of membrane protein interactions. The QI-FRET methodology allows us to acquire binding curves and calculate association constants for complex membrane proteins in the native plasma membrane environment. The method utilizes FRET detection, and thus requires that the proteins of interest are labeled with florescent proteins, either FRET donors or FRET acceptors. Since plasma membranes of cells have complex topologies precluding the acquisition of two-dimensional binding curves, the FRET measurements are performed in plasma membrane derived vesicles that bud off cells as a result of chemical or osmotic stress. The results overviewed here are acquired in vesicles produced with an osmotic vesiculation buffer developed in our laboratory, which does not utilize harsh chemicals. The concentrations of the donor-labeled and the acceptor-labeled proteins are determined, along with the FRET efficiencies, in each vesicle. The experiments utilize transient transfection, such that a wide variety of concentrations is sampled. Then, data from hundreds of vesicles are combined to yield dimerization curves. Here we discuss recent findings about the dimerization of receptor tyrosine kinases (RTKs), membrane proteins that control cell growth and differentiation via lateral dimerization in the plasma membrane. We focus on the dimerization of fibroblast growth factor receptor 3 (FGFR3), a RTK that plays a critically important role in skeletal development. We study the role of different FGFR3 domains in FGFR3 dimerization in the absence of ligand, and we show that FGFR3 extracellular domains inhibit unliganded dimerization, while contacts between the juxtamembrane domains, which connect the transmembrane domains to the kinase domains, stabilize the unliganded FGFR3 dimers. Since FGFR3 has been documented to harbor many pathogenic single amino acid mutations that cause skeletal and cranial dysplasias, as well as cancer, we also study the effects of these mutations on dimerization. First, we show that the A391E mutation, linked to Crouzon syndrome with acanthosis nigricans and to bladder cancer, significantly enhances FGFR3 dimerization in the absence of ligand and thus induces aberrant receptor interactions. Second, we present results about the effect of three cysteine mutations that cause thanatophoric dysplasia, a lethal phenotype. Such cysteine mutations have been hypothesized previously to cause constitutive dimerization, but we find instead that they have a surprisingly modest effect on dimerization. Most of the studied pathogenic mutations also altered FGFR3 dimer structure, suggesting that both increases in dimerization propensities and changes in dimer structure contribute to the pathological phenotypes. The results acquired with the QI-FRET method further our understanding of the interactions between FGFR3 molecules and RTK molecules in general. Since RTK dimerization regulates RTK signaling, our findings advance our knowledge of RTK activity in health and disease. The utility of the QI-FRET method is not restricted to RTKs, and we thus hope that in the future the QI-FRET method will be applied to other classes of membrane proteins, such as channels and G protein-coupled receptors.
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MESH Headings
- Acanthosis Nigricans/etiology
- Acanthosis Nigricans/genetics
- Cell Membrane/chemistry
- Cell Membrane/metabolism
- Craniofacial Dysostosis/etiology
- Craniofacial Dysostosis/genetics
- Dimerization
- Fluorescence Resonance Energy Transfer
- Humans
- Mutagenesis, Site-Directed
- Protein Structure, Tertiary
- Receptor, Fibroblast Growth Factor, Type 3/chemistry
- Receptor, Fibroblast Growth Factor, Type 3/deficiency
- Receptor, Fibroblast Growth Factor, Type 3/genetics
- Receptor, Fibroblast Growth Factor, Type 3/metabolism
- Thanatophoric Dysplasia/etiology
- Thanatophoric Dysplasia/genetics
- Transport Vesicles/chemistry
- Transport Vesicles/metabolism
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Affiliation(s)
- Sarvenaz Sarabipour
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218
| | - Nuala Del Piccolo
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218
| | - Kalina Hristova
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218
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Sarabipour S, Hristova K. FGFR3 unliganded dimer stabilization by the juxtamembrane domain. J Mol Biol 2015; 427:1705-14. [PMID: 25688803 PMCID: PMC4380549 DOI: 10.1016/j.jmb.2015.02.013] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 01/12/2015] [Accepted: 02/11/2015] [Indexed: 11/22/2022]
Abstract
Receptor tyrosine kinases (RTKs) conduct biochemical signals upon dimerization in the membrane plane. While RTKs are generally known to be activated in response to ligand binding, many of these receptors are capable of forming unliganded dimers that are likely important intermediates in the signaling process. All 58 RTKs consist of an extracellular (EC) domain, a transmembrane (TM) domain, and an intracellular domain that includes a juxtamembrane (JM) sequence and a kinase domain. Here we investigate directly the effect of the JM domain on unliganded dimer stability of FGFR3, a receptor that is critically important for skeletal development. The data suggest that FGFR3 unliganded dimers are stabilized by receptor-receptor contacts that involve the JM domains. The contribution is significant, as it is similar in magnitude to the stabilizing contribution of a pathogenic mutation and the repulsive contribution of the EC domain. Furthermore, we show that the effects of the JM domain and a TM pathogenic mutation on unliganded FGFR3 dimer stability are additive. We observe that the JM-mediated dimer stabilization occurs when the JM domain is linked to FGFR3 TM domain and not simply anchored to the plasma membrane. These results point to a coordinated stabilization of the unliganded dimeric state of FGFR3 by its JM and TM domains via a mechanism that is distinctly different from the case of another well studied receptor, EGFR.
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Affiliation(s)
- Sarvenaz Sarabipour
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21212, USA
| | - Kalina Hristova
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21212, USA.
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31
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Toward understanding driving forces in membrane protein folding. Arch Biochem Biophys 2014; 564:297-313. [DOI: 10.1016/j.abb.2014.07.031] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2014] [Revised: 07/21/2014] [Accepted: 07/23/2014] [Indexed: 12/13/2022]
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32
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Folding energetics and oligomerization of polytopic α-helical transmembrane proteins. Arch Biochem Biophys 2014; 564:281-96. [DOI: 10.1016/j.abb.2014.07.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 06/26/2014] [Accepted: 07/14/2014] [Indexed: 01/06/2023]
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33
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King C, Sarabipour S, Byrne P, Leahy DJ, Hristova K. The FRET signatures of noninteracting proteins in membranes: simulations and experiments. Biophys J 2014; 106:1309-17. [PMID: 24655506 DOI: 10.1016/j.bpj.2014.01.039] [Citation(s) in RCA: 75] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Revised: 01/08/2014] [Accepted: 01/27/2014] [Indexed: 11/30/2022] Open
Abstract
Förster resonance energy transfer (FRET) experiments are often used to study interactions between integral membrane proteins in cellular membranes. However, in addition to the FRET of sequence-specific interactions, these experiments invariably record a contribution due to proximity FRET, which occurs when a donor and an acceptor approach each other by chance within distances of ∼100 Å. This effect does not reflect specific interactions in the membrane and is frequently unappreciated, despite the fact that its magnitude can be significant. Here we develop a computational description of proximity FRET, simulating the cases of proximity FRET when fluorescent proteins are used to tag monomeric, dimeric, trimeric, and tetrameric membrane proteins, as well as membrane proteins existing in monomer-dimer equilibria. We also perform rigorous experimental measurements of this effect, by identifying membrane receptors that do not associate in mammalian membranes. We measure the FRET efficiencies between yellow fluorescent protein and mCherry-tagged versions of these receptors in plasma-membrane-derived vesicles as a function of receptor concentration. Finally, we demonstrate that the experimental measurements are well described by our predictions. The work presented here brings additional rigor to FRET-based studies of membrane protein interactions, and should have broad utility in membrane biophysics research.
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Affiliation(s)
- Christopher King
- Program in Molecular Biophysics, Johns Hopkins University, Baltimore, Maryland
| | - Sarvenaz Sarabipour
- Department of Materials Sciences and Engineering, Johns Hopkins University, Baltimore, Maryland
| | - Patrick Byrne
- Program in Molecular Biophysics, Johns Hopkins University, Baltimore, Maryland
| | - Daniel J Leahy
- Program in Molecular Biophysics, Johns Hopkins University, Baltimore, Maryland; Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, Maryland
| | - Kalina Hristova
- Department of Materials Sciences and Engineering, Johns Hopkins University, Baltimore, Maryland; Program in Molecular Biophysics, Johns Hopkins University, Baltimore, Maryland.
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34
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Chavent M, Chetwynd AP, Stansfeld PJ, Sansom MSP. Dimerization of the EphA1 receptor tyrosine kinase transmembrane domain: Insights into the mechanism of receptor activation. Biochemistry 2014; 53:6641-52. [PMID: 25286141 PMCID: PMC4298228 DOI: 10.1021/bi500800x] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
![]()
EphA1
is a receptor tyrosine kinase (RTK) that plays a key role
in developmental processes, including guidance of the migration of
axons and cells in the nervous system. EphA1, in common with other
RTKs, contains an N-terminal extracellular domain, a single transmembrane
(TM) α-helix, and a C-terminal intracellular kinase domain.
The TM helix forms a dimer, as seen in recent NMR studies. We have
modeled the EphA1 TM dimer using a multiscale approach combining coarse-grain
(CG) and atomistic molecular dynamics (MD) simulations. The one-dimensional
potential of mean force (PMF) for this system, based on interhelix
separation, has been calculated using CG MD simulations. This provides
a view of the free energy landscape for helix–helix interactions
of the TM dimer in a lipid bilayer. The resulting PMF profiles suggest
two states, consistent with a rotation-coupled activation mechanism.
The more stable state corresponds to a right-handed helix dimer interacting
via an N-terminal glycine zipper motif, consistent with a recent NMR
structure (2K1K). A second metastable state corresponds to a structure in which
the glycine zipper motif is not involved. Analysis of unrestrained
CG MD simulations based on representative models from the PMF calculations
or on the NMR structure reveals possible pathways of interconversion
between these two states, involving helix rotations about their long
axes. This suggests that the interaction of TM helices in EphA1 dimers
may be intrinsically dynamic. This provides a potential mechanism
for signaling whereby extracellular events drive a shift in the repopulation
of the underlying TM helix dimer energy landscape.
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Affiliation(s)
- Matthieu Chavent
- Department of Biochemistry, University of Oxford , South Parks Road, Oxford OX1 3QU, United Kingdom
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35
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Placone J, He L, Del Piccolo N, Hristova K. Strong dimerization of wild-type ErbB2/Neu transmembrane domain and the oncogenic Val664Glu mutant in mammalian plasma membranes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 2014; 1838:2326-30. [PMID: 24631664 DOI: 10.1016/j.bbamem.2014.03.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2013] [Revised: 02/28/2014] [Accepted: 03/01/2014] [Indexed: 12/29/2022]
Abstract
Here, we study the homodimerization of the transmembrane domain of Neu, as well as an oncogenic mutant (V664E), in vesicles derived from the plasma membrane of mammalian cells. For the characterization, we use a Förster resonance energy transfer (FRET)-based method termed Quantitative Imaging-FRET (QI-FRET), which yields the donor and acceptor concentrations in addition to the FRET efficiencies in individual plasma membrane-derived vesicles. Our results demonstrate that both the wild-type and the mutant are 100% dimeric, suggesting that the Neu TM helix dimerizes more efficiently than other RTK TM domains in mammalian membranes. Furthermore, the data suggest that the V664E mutation causes a very small, but statistically significant change in dimer structure. This article is part of a Special Issue entitled: Interfacially Active Peptides and Proteins. Guest Editors: William C. Wimley and Kalina Hristova.
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Affiliation(s)
- Jesse Placone
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA
| | - Lijuan He
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA
| | - Nuala Del Piccolo
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA
| | - Kalina Hristova
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, MD 21218, USA.
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36
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Sakanyan V, Angelini M, Le Béchec M, Lecocq MF, Benaiteau F, Rousseau B, Gyulkhandanyan A, Gyulkhandanyan L, Logé C, Reiter E, Roussakis C, Fleury F. Screening and discovery of nitro-benzoxadiazole compounds activating epidermal growth factor receptor (EGFR) in cancer cells. Sci Rep 2014; 4:3977. [PMID: 24496106 PMCID: PMC3913914 DOI: 10.1038/srep03977] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Accepted: 01/13/2014] [Indexed: 12/13/2022] Open
Abstract
Peptide ligand-induced dimerization of the extracellular region of the epidermal growth factor receptor (sEGFR) is central to the signal transduction of many cellular processes. A small molecule microarray screen has been developed to search for non-peptide compounds able to bind to sEGFR. We describe the discovery of nitro-benzoxadiazole (NBD) compounds that enhance tyrosine phosphorylation of EGFR and thereby trigger downstream signaling pathways and other receptor tyrosine kinases in cancer cells. The protein phosphorylation profile in cells exposed to NBD compounds is to some extent reminiscent of the profile induced by the cognate ligand. Experimental studies indicate that the small compounds bind to the dimerization domain of sEGFR, and generate stable dimers providing allosteric activation of the receptor. Moreover, receptor phosphorylation is associated with inhibition of PTP-1B phosphatase. Our data offer a promising paradigm for investigating new aspects of signal transduction mediated by EGFR in cancer cells exposed to electrophilic NBD compounds.
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Affiliation(s)
- Vehary Sakanyan
- 1] ProtNeteomix, 29 rue de Provence, 44700 Orvault, France [2] IICIMED-EA 1155, UFR Sciences Pharmaceutiques, UFR Sciences et Techniques, Université de Nantes, 2 rue de la Houssinière 44322 Nantes, France
| | | | - Mickael Le Béchec
- FRE-CNRS 3478, UFR Sciences et Techniques, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes, France
| | | | - Florence Benaiteau
- IICIMED-EA 1155, UFR Sciences Pharmaceutiques, UFR Sciences et Techniques, Université de Nantes, 2 rue de la Houssinière 44322 Nantes, France
| | - Bénédicte Rousseau
- IICIMED-EA 1155, UFR Sciences Pharmaceutiques, UFR Sciences et Techniques, Université de Nantes, 2 rue de la Houssinière 44322 Nantes, France
| | - Aram Gyulkhandanyan
- Institute of Biochemistry, National Academy of Sciences of Armenia, Yerevan, Republic of Armenia
| | - Lusine Gyulkhandanyan
- Institute of Biochemistry, National Academy of Sciences of Armenia, Yerevan, Republic of Armenia
| | - Cédric Logé
- IICIMED-EA 1155, UFR Sciences Pharmaceutiques, UFR Sciences et Techniques, Université de Nantes, 2 rue de la Houssinière 44322 Nantes, France
| | - Eric Reiter
- BIOS group, UMR85 INRA; UMR7247 CNRS; IFCE, 37380 Nouzilly, France
| | - Christos Roussakis
- IICIMED-EA 1155, UFR Sciences Pharmaceutiques, UFR Sciences et Techniques, Université de Nantes, 2 rue de la Houssinière 44322 Nantes, France
| | - Fabrice Fleury
- FRE-CNRS 3478, UFR Sciences et Techniques, Université de Nantes, 2 rue de la Houssinière, 44322 Nantes, France
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37
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Sarabipour S, Hristova K. FGFR3 transmembrane domain interactions persist in the presence of its extracellular domain. Biophys J 2014; 105:165-71. [PMID: 23823235 DOI: 10.1016/j.bpj.2013.05.053] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Revised: 05/17/2013] [Accepted: 05/31/2013] [Indexed: 01/30/2023] Open
Abstract
Isolated receptor tyrosine kinase transmembrane (TM) domains have been shown to form sequence-specific dimers in membranes. Yet, it is not clear whether studies of isolated TM domains yield knowledge that is relevant to full-length receptors or whether the large glycosylated extracellular domains alter the interactions between the TM helices. Here, we address this question by quantifying the effect of the pathogenic A391E TM domain mutation on the stability of the fibroblast growth factor receptor 3 dimer in the presence of the extracellular domain and comparing these results to the case of the isolated TM fibroblast growth factor receptor 3 domains. We perform the measurements in plasma membrane-derived vesicles using a Förster-resonance-energy-transfer-based method. The effect of the mutation on dimer stability in both cases is the same (∼-1.5 kcal/mol), suggesting that the interactions observed in simple TM-peptide model systems are relevant in a biological context.
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Affiliation(s)
- Sarvenaz Sarabipour
- Department of Materials Sciences and Engineering, Johns Hopkins University, Baltimore, Maryland, USA
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38
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Chukkapalli S, Amessou M, Dilly AK, Dekhil H, Zhao J, Liu Q, Bejna A, Thomas RD, Bandyopadhyay S, Bismar TA, Neill D, Azoulay L, Batist G, Kandouz M. Role of the EphB2 receptor in autophagy, apoptosis and invasion in human breast cancer cells. Exp Cell Res 2013; 320:233-46. [PMID: 24211352 DOI: 10.1016/j.yexcr.2013.10.022] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2013] [Revised: 10/28/2013] [Accepted: 10/29/2013] [Indexed: 10/26/2022]
Abstract
The Eph and Ephrin proteins, which constitute the largest family of receptor tyrosine kinases, are involved in normal tissue development and cancer progression. Here, we examined the expression and role of the B-type Eph receptor EphB2 in breast cancers. By immunohistochemistry using a progression tissue microarray of human clinical samples, we found EphB2 to be expressed in benign tissues, but strongly increased in cancers particularly in invasive and metastatic carcinomas. Subsequently, we found evidence that EphB2, whose expression varies in established cell breast lines, possesses multiple functions. First, the use of a DOX-inducible system to restore EphB2 function to low expressers resulted in decreased tumor growth in vitro and in vivo, while its siRNA-mediated silencing in high expressers increased growth. This function involves the onset of apoptotic death paralleled by caspases 3 and 9 activation. Second, EphB2 was also found to induce autophagy, as assessed by immunofluorescence and/or immunoblotting examination of the LC3, ATG5 and ATG12 markers. Third, EphB2 also has a pro-invasive function in breast cancer cells that involves the regulation of MMP2 and MMP9 metalloproteases and can be blocked by treatment with respective neutralizing antibodies. Furthermore, EphB2-induced invasion is kinase-dependent and is impeded in cells expressing a kinase-dead mutant EphB2. In summary, we identified a mechanism involving a triple role for EphB2 in breast cancer progression, whereby it regulates apoptosis, autophagy, and invasion.
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Affiliation(s)
- Sahiti Chukkapalli
- Department of Pathology, Wayne State University School of Medicine, Detroit, MI, USA
| | - Mohamed Amessou
- Department of Pathology, Wayne State University School of Medicine, Detroit, MI, USA
| | - Ashok K Dilly
- Department of Pathology, Wayne State University School of Medicine, Detroit, MI, USA
| | - Hafedh Dekhil
- Obesity Research Center, College of Medicine, King Saud University, Kingdom of Saudi Arabia
| | - Jing Zhao
- Montréal Centre for Experimental Therapeutics in Cancer, Segal cancer Centre, Lady Davis Institute for Medical Research, Jewish General Hospital, Montréal, Québec, Canada
| | - Qiang Liu
- Montréal Centre for Experimental Therapeutics in Cancer, Segal cancer Centre, Lady Davis Institute for Medical Research, Jewish General Hospital, Montréal, Québec, Canada
| | - Alex Bejna
- Department of Pathology, Wayne State University School of Medicine, Detroit, MI, USA
| | - Ron D Thomas
- Department of Pathology, Wayne State University School of Medicine, Detroit, MI, USA
| | | | - Tarek A Bismar
- Departments of Pathology & Laboratory Medicine, Oncology, Biochemistry & Molecular Biology, University of Calgary, Calgary, Canada
| | - Daniel Neill
- Department of Pathology, Wayne State University School of Medicine, Detroit, MI, USA
| | - Laurent Azoulay
- Department of Oncology, McGill University, Montréal, Québec, Canada
| | - Gerald Batist
- Montréal Centre for Experimental Therapeutics in Cancer, Segal cancer Centre, Lady Davis Institute for Medical Research, Jewish General Hospital, Montréal, Québec, Canada; Department of Oncology, McGill University, Montréal, Québec, Canada
| | - Mustapha Kandouz
- Department of Pathology, Wayne State University School of Medicine, Detroit, MI, USA; Karmanos Cancer Institute, Wayne State University, Detroit, MI, USA.
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39
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Bocharov EV, Lesovoy DM, Goncharuk SA, Goncharuk MV, Hristova K, Arseniev AS. Structure of FGFR3 transmembrane domain dimer: implications for signaling and human pathologies. Structure 2013; 21:2087-93. [PMID: 24120763 PMCID: PMC3844157 DOI: 10.1016/j.str.2013.08.026] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2013] [Revised: 08/28/2013] [Accepted: 08/30/2013] [Indexed: 11/22/2022]
Abstract
Fibroblast growth factor receptor 3 (FGFR3) transduces biochemical signals via lateral dimerization in the plasma membrane, and plays an important role in human development and disease. Eight different pathogenic mutations, implicated in cancers and growth disorders, have been identified in the FGFR3 transmembrane segment. Here, we describe the dimerization of the FGFR3 transmembrane domain in membrane-mimicking DPC/SDS (9/1) micelles. In the solved NMR structure, the two transmembrane helices pack into a symmetric left-handed dimer, with intermolecular stacking interactions occurring in the dimer central region. Some pathogenic mutations fall within the helix-helix interface, whereas others are located within a putative alternative interface. This implies that although the observed dimer structure is important for FGFR3 signaling, the mechanism of FGFR3-mediated transduction across the membrane is complex. We propose an FGFR3 signaling mechanism that is based on the solved structure, available structures of isolated soluble FGFR domains, and published biochemical and biophysical data.
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Affiliation(s)
- Eduard V Bocharov
- Department of Structural Biology, Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Miklukho-Maklaya Street 16/10, Moscow 117997, Russian Federation.
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40
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Pridans C, Sauter KA, Baer K, Kissel H, Hume DA. CSF1R mutations in hereditary diffuse leukoencephalopathy with spheroids are loss of function. Sci Rep 2013; 3:3013. [PMID: 24145216 PMCID: PMC3804858 DOI: 10.1038/srep03013] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2013] [Accepted: 10/04/2013] [Indexed: 02/08/2023] Open
Abstract
Hereditary diffuse leukoencephalopathy with spheroids (HDLS) in humans is a rare autosomal dominant disease characterized by giant neuroaxonal swellings (spheroids) within the CNS white matter. Symptoms are variable and can include personality and behavioural changes. Patients with this disease have mutations in the protein kinase domain of the colony-stimulating factor 1 receptor (CSF1R) which is a tyrosine kinase receptor essential for microglia development. We investigated the effects of these mutations on Csf1r signalling using a factor dependent cell line. Corresponding mutant forms of murine Csf1r were expressed on the cell surface at normal levels, and bound CSF1, but were not able to sustain cell proliferation. Since Csf1r signaling requires receptor dimerization initiated by CSF1 binding, the data suggest a mechanism for phenotypic dominance of the mutant allele in HDLS.
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Affiliation(s)
- Clare Pridans
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian EH25 9RG, Scotland, UK
- These authors contributed equally to this work
| | - Kristin A. Sauter
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian EH25 9RG, Scotland, UK
- These authors contributed equally to this work
| | | | | | - David A. Hume
- The Roslin Institute and Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush, Midlothian EH25 9RG, Scotland, UK
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41
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Free energy of WALP23 dimer association in DMPC, DPPC, and DOPC bilayers. Chem Phys Lipids 2013; 169:95-105. [DOI: 10.1016/j.chemphyslip.2013.02.001] [Citation(s) in RCA: 100] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2012] [Revised: 01/30/2013] [Accepted: 02/01/2013] [Indexed: 11/23/2022]
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42
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Chen F, Sarabipour S, Hristova K. Multiple consequences of a single amino acid pathogenic RTK mutation: the A391E mutation in FGFR3. PLoS One 2013; 8:e56521. [PMID: 23437153 PMCID: PMC3577887 DOI: 10.1371/journal.pone.0056521] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2012] [Accepted: 01/12/2013] [Indexed: 12/30/2022] Open
Abstract
The A391E mutation in fibroblast growth factor receptor 3 (FGFR3) is the genetic cause for Crouzon syndrome with Acanthosis Nigricans. Here we investigate the effect of this mutation on FGFR3 activation in HEK 293 T cells over a wide range of fibroblast growth factor 1 concentrations using a physical-chemical approach that deconvolutes the effects of the mutation on dimerization, ligand binding, and efficiency of phosphorylation. It is believed that the mutation increases FGFR3 dimerization, and our results verify this. However, our results also demonstrate that the increase in dimerization is not the sole effect of the mutation, as the mutation also facilitates the phosphorylation of critical tyrosines in the activation loop of FGFR3. The activation of mutant FGFR3 is substantially increased due to a combination of these two effects. The low expression of the mutant, however, attenuates its signaling and may explain the mild phenotype in Crouzon syndrome with Acanthosis Nigricans. The results presented here provide new knowledge about the physical basis behind growth disorders and highlight the fact that a single RTK mutation may affect multiple steps in RTK activation.
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Affiliation(s)
- Fenghao Chen
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Sarvenaz Sarabipour
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland, United States of America
| | - Kalina Hristova
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland, United States of America
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43
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Prasanna X, Praveen PJ, Sengupta D. Sequence dependent lipid-mediated effects modulate the dimerization of ErbB2 and its associative mutants. Phys Chem Chem Phys 2013; 15:19031-41. [DOI: 10.1039/c3cp52447g] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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44
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Doumiati S, Haupt K, Rossi C. Autophosphorylation activation and inhibition by curcumin of the epidermal growth factor receptor reconstituted in liposomes. J Mol Recognit 2012; 25:623-9. [DOI: 10.1002/jmr.2194] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Samah Doumiati
- UMR 6022 CNRS; Université de Technologie de Compiègne; BP 20529, 60205; Compiègne Cedex; France
| | - Karsten Haupt
- UMR 6022 CNRS; Université de Technologie de Compiègne; BP 20529, 60205; Compiègne Cedex; France
| | - Claire Rossi
- UMR 6022 CNRS; Université de Technologie de Compiègne; BP 20529, 60205; Compiègne Cedex; France
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Placone J, Hristova K. Direct assessment of the effect of the Gly380Arg achondroplasia mutation on FGFR3 dimerization using quantitative imaging FRET. PLoS One 2012; 7:e46678. [PMID: 23056398 PMCID: PMC3467271 DOI: 10.1371/journal.pone.0046678] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2012] [Accepted: 09/04/2012] [Indexed: 11/19/2022] Open
Abstract
The Gly380Arg mutation in FGFR3 is the genetic cause for achondroplasia (ACH), the most common form of human dwarfism. The mutation has been proposed to increase FGFR3 dimerization, but the dimerization propensities of wild-type and mutant FGFR3 have not been compared. Here we use quantitative imaging FRET to characterize the dimerization of wild-type FGFR3 and the ACH mutant in plasma membrane-derived vesicles from HEK293T cells. We demonstrate a small, but statistically significant increase in FGFR3 dimerization due to the ACH mutation. The data are consistent with the idea that the ACH mutation causes a structural change which affects both the stability and the activity of FGFR3 dimers in the absence of ligand.
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Affiliation(s)
| | - Kalina Hristova
- Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland, United States of America
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Del Piccolo N, Placone J, He L, Agudelo SC, Hristova K. Production of plasma membrane vesicles with chloride salts and their utility as a cell membrane mimetic for biophysical characterization of membrane protein interactions. Anal Chem 2012; 84:8650-5. [PMID: 22985263 DOI: 10.1021/ac301776j] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Plasma membrane derived vesicles are used as a model system for the biochemical and biophysical investigations of membrane proteins and membrane organization. The most widely used vesiculation procedure relies on formaldehyde and dithiothreitol (DTT), but these active chemicals may introduce artifacts in the experimental results. Here we describe a procedure to vesiculate Chinese hamster ovary (CHO) cells, widely used for the expression of recombinant proteins, using a hypertonic vesiculation buffer containing chloride salts and no formaldehyde or DTT. We characterize the size distribution of the produced vesicles. We also show that these vesicles can be used for the biophysical characterization of interactions between membrane proteins.
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Affiliation(s)
- Nuala Del Piccolo
- Department of Materials Science and Engineering, Johns Hopkins University, 3400 North Charles Street, Baltimore, Maryland 21218, United States
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