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Ray S, Hewitt K. Sticky, Adaptable, and Many-sided: SAM protein versatility in normal and pathological hematopoietic states. Bioessays 2023; 45:e2300022. [PMID: 37318311 PMCID: PMC10527593 DOI: 10.1002/bies.202300022] [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: 02/01/2023] [Revised: 05/10/2023] [Accepted: 05/15/2023] [Indexed: 06/16/2023]
Abstract
With decades of research seeking to generalize sterile alpha motif (SAM) biology, many outstanding questions remain regarding this multi-tool protein module. Recent data from structural and molecular/cell biology has begun to reveal new SAM modes of action in cell signaling cascades and biomolecular condensation. SAM-dependent mechanisms underlie blood-related (hematologic) diseases, including myelodysplastic syndromes and leukemias, prompting our focus on hematopoiesis for this review. With the increasing coverage of SAM-dependent interactomes, a hypothesis emerges that SAM interaction partners and binding affinities work to fine tune cell signaling cascades in developmental and disease contexts, including hematopoiesis and hematologic disease. This review discusses what is known and remains unknown about the standard mechanisms and neoplastic properties of SAM domains and what the future might hold for developing SAM-targeted therapies.
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Affiliation(s)
- Suhita Ray
- Department of Genetics, Cell Biology and Anatomy, University of Nebraska Medical Center, Omaha, NE, 68198, United States
| | - Kyle Hewitt
- Department of Genetics, Cell Biology and Anatomy, University of Nebraska Medical Center, Omaha, NE, 68198, United States
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2
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Hunting for Novel Routes in Anticancer Drug Discovery: Peptides against Sam-Sam Interactions. Int J Mol Sci 2022; 23:ijms231810397. [PMID: 36142306 PMCID: PMC9499636 DOI: 10.3390/ijms231810397] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 09/02/2022] [Accepted: 09/02/2022] [Indexed: 01/10/2023] Open
Abstract
Among the diverse protein binding modules, Sam (Sterile alpha motif) domains attract attention due to their versatility. They are present in different organisms and play many functions in physiological and pathological processes by binding multiple partners. The EphA2 receptor contains a Sam domain at the C-terminus (EphA2-Sam) that is able to engage protein regulators of receptor stability (including the lipid phosphatase Ship2 and the adaptor Odin). Ship2 and Odin are recruited by EphA2-Sam through heterotypic Sam-Sam interactions. Ship2 decreases EphA2 endocytosis and consequent degradation, producing chiefly pro-oncogenic outcomes in a cellular milieu. Odin, through its Sam domains, contributes to receptor stability by possibly interfering with ubiquitination. As EphA2 is upregulated in many types of tumors, peptide inhibitors of Sam-Sam interactions by hindering receptor stability could function as anticancer therapeutics. This review describes EphA2-Sam and its interactome from a structural and functional perspective. The diverse design strategies that have thus far been employed to obtain peptides targeting EphA2-mediated Sam-Sam interactions are summarized as well. The generated peptides represent good initial lead compounds, but surely many efforts need to be devoted in the close future to improve interaction affinities towards Sam domains and consequently validate their anticancer properties.
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Vincenzi M, Anna Mercurio F, Di Natale C, Palumbo R, Pirone L, La Manna S, Marasco D, Maria Pedone E, Leone M. Targeting Ship2-Sam with peptide ligands: Novel insights from a multidisciplinary approach. Bioorg Chem 2022; 122:105680. [DOI: 10.1016/j.bioorg.2022.105680] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 01/24/2022] [Accepted: 02/09/2022] [Indexed: 01/06/2023]
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4
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Vincenzi M, Mercurio FA, Leone M. NMR Spectroscopy in the Conformational Analysis of Peptides: An Overview. Curr Med Chem 2021; 28:2729-2782. [PMID: 32614739 DOI: 10.2174/0929867327666200702131032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 05/21/2020] [Accepted: 05/28/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND NMR spectroscopy is one of the most powerful tools to study the structure and interaction properties of peptides and proteins from a dynamic perspective. Knowing the bioactive conformations of peptides is crucial in the drug discovery field to design more efficient analogue ligands and inhibitors of protein-protein interactions targeting therapeutically relevant systems. OBJECTIVE This review provides a toolkit to investigate peptide conformational properties by NMR. METHODS Articles cited herein, related to NMR studies of peptides and proteins were mainly searched through PubMed and the web. More recent and old books on NMR spectroscopy written by eminent scientists in the field were consulted as well. RESULTS The review is mainly focused on NMR tools to gain the 3D structure of small unlabeled peptides. It is more application-oriented as it is beyond its goal to deliver a profound theoretical background. However, the basic principles of 2D homonuclear and heteronuclear experiments are briefly described. Protocols to obtain isotopically labeled peptides and principal triple resonance experiments needed to study them, are discussed as well. CONCLUSION NMR is a leading technique in the study of conformational preferences of small flexible peptides whose structure can be often only described by an ensemble of conformations. Although NMR studies of peptides can be easily and fast performed by canonical protocols established a few decades ago, more recently we have assisted to tremendous improvements of NMR spectroscopy to investigate instead large systems and overcome its molecular weight limit.
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Affiliation(s)
- Marian Vincenzi
- Institute of Biostructures and Bioimaging, National Research Council of Italy, Via Mezzocannone 16, 80134, Naples, Italy
| | - Flavia Anna Mercurio
- Institute of Biostructures and Bioimaging, National Research Council of Italy, Via Mezzocannone 16, 80134, Naples, Italy
| | - Marilisa Leone
- Institute of Biostructures and Bioimaging, National Research Council of Italy, Via Mezzocannone 16, 80134, Naples, Italy
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5
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Neira JL, Rizzuti B, Ortega-Alarcón D, Giudici AM, Abián O, Fárez-Vidal ME, Velázquez-Campoy A. The armadillo-repeat domain of plakophilin 1 binds the C-terminal sterile alpha motif (SAM) of p73. Biochim Biophys Acta Gen Subj 2021; 1865:129914. [PMID: 33872756 DOI: 10.1016/j.bbagen.2021.129914] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 04/13/2021] [Accepted: 04/13/2021] [Indexed: 12/31/2022]
Abstract
BACKGROUND Plakophilin 1 (PKP1) is a component of desmosomes, which are key structural components for cell-cell adhesion, and can also be found in other cell locations. The p53, p63 and p73 proteins belong to the p53 family of transcription factors, playing crucial roles in tumour suppression. The α-splice variant of p73 (p73α) has at its C terminus a sterile alpha motif (SAM); such domain, SAMp73, is involved in the interaction with other macromolecules. METHODS We studied the binding of SAMp73 with the armadillo domain of PKP1 (ARM-PKP1) in the absence and the presence of 100 mM NaCl, by using several biophysical techniques, namely fluorescence, far-ultraviolet circular dichroism (CD), nuclear magnetic resonance (NMR), isothermal titration calorimetry (ITC), and molecular docking and simulations. RESULTS Association was observed between the two proteins, with a dissociation constant of ~5 μM measured by ITC and fluorescence in the absence of NaCl. The binding region of SAMp73 involved residues of the so-called "middle-loop-end-helix" binding region (i.e., comprising the third helix, together with the C terminus of the second one, and the N-cap of the fourth), as shown by 15N, 1H- HSQC-NMR spectra. Molecular modelling provided additional information on the possible structure of the binding complex. CONCLUSIONS This newly-observed interaction could have potential therapeutic relevance in the tumour pathways where PKP1 is involved, and under conditions when there is a possible inactivation of p53. GENERAL SIGNIFICANCE The discovery of the binding between SAMp73 and ARM-PKP1 suggests a functional role for their interaction, including the possibility that SAMp73 could assist PKP1 in signalling pathways.
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Affiliation(s)
- José L Neira
- IDIBE, Universidad Miguel Hernández, 03202 Elche, Alicante, Spain; Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), Joint Units IQFR-CSIC-BIFI, GBsC-CSIC-BIFI, Universidad de Zaragoza, 50009 Zaragoza, Spain.
| | - Bruno Rizzuti
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), Joint Units IQFR-CSIC-BIFI, GBsC-CSIC-BIFI, Universidad de Zaragoza, 50009 Zaragoza, Spain; CNR-NANOTEC, Licryl-UOS Cosenza and CEMIF.Cal, Department of Physics, University of Calabria, 87036 Rende, Italy.
| | - David Ortega-Alarcón
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), Joint Units IQFR-CSIC-BIFI, GBsC-CSIC-BIFI, Universidad de Zaragoza, 50009 Zaragoza, Spain
| | | | - Olga Abián
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), Joint Units IQFR-CSIC-BIFI, GBsC-CSIC-BIFI, Universidad de Zaragoza, 50009 Zaragoza, Spain; Instituto de Investigación Sanitaria Aragón (IIS Aragón), 50009 Zaragoza, Spain; Instituto Aragonés de Ciencias de la Salud (IACS), 50009 Zaragoza, Spain; Centro de Investigación Biomédica en Red en el Área Temática de Enfermedades Hepáticas y Digestivas (CIBERehd), Madrid, Spain; Departamento de Bioquímica y Biología Molecular y Celular, Universidad de Zaragoza, 50009 Zaragoza, Spain
| | - María Esther Fárez-Vidal
- Departamento de Bioquímica y Biología Molecular III e Inmunología, Facultad de Medicina, Universidad de Granada, 18016 Granada, Spain; Instituto de Investigación Biomédica IBS, Complejo Hospitalario Universitario de Granada, Universidad de Granada, 18071 Granada, Spain
| | - Adrián Velázquez-Campoy
- Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), Joint Units IQFR-CSIC-BIFI, GBsC-CSIC-BIFI, Universidad de Zaragoza, 50009 Zaragoza, Spain; Instituto de Investigación Sanitaria Aragón (IIS Aragón), 50009 Zaragoza, Spain; Fundacion ARAID, Government of Aragon, 50009 Zaragoza, Spain; Centro de Investigación Biomédica en Red en el Área Temática de Enfermedades Hepáticas y Digestivas (CIBERehd), Madrid, Spain; Departamento de Bioquímica y Biología Molecular y Celular, Universidad de Zaragoza, 50009 Zaragoza, Spain
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Targeting SHIP1 and SHIP2 in Cancer. Cancers (Basel) 2021; 13:cancers13040890. [PMID: 33672717 PMCID: PMC7924360 DOI: 10.3390/cancers13040890] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2021] [Revised: 02/12/2021] [Accepted: 02/13/2021] [Indexed: 12/31/2022] Open
Abstract
Simple Summary Phosphoinositol signaling pathways and their dysregulation have been shown to have a fundamental role in health and disease, respectively. The SH2-containing 5′ inositol phosphatases, SHIP1 and SHIP2, are regulators of the PI3K/AKT pathway that have crucial roles in cancer progression. This review aims to summarize the role of SHIP1 and SHIP2 in cancer signaling and the immune response to cancer, the discovery and use of SHIP inhibitors and agonists as possible cancer therapeutics. Abstract Membrane-anchored and soluble inositol phospholipid species are critical mediators of intracellular cell signaling cascades. Alterations in their normal production or degradation are implicated in the pathology of a number of disorders including cancer and pro-inflammatory conditions. The SH2-containing 5′ inositol phosphatases, SHIP1 and SHIP2, play a fundamental role in these processes by depleting PI(3,4,5)P3, but also by producing PI(3,4)P2 at the inner leaflet of the plasma membrane. With the intent of targeting SHIP1 or SHIP2 selectively, or both paralogs simultaneously, small molecule inhibitors and agonists have been developed and tested in vitro and in vivo over the last decade in various disease models. These studies have shown promising results in various pre-clinical models of disease including cancer and tumor immunotherapy. In this review the potential use of SHIP inhibitors in cancer is discussed with particular attention to the molecular structure, binding site and efficacy of these SHIP inhibitors.
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Zhou H, Yue X, Wang Z, Li S, Zhu J, Yang Y, Liu M. Expression, purification and characterization of the RhoA-binding domain of human SHIP2 in E.coli. Protein Expr Purif 2021; 180:105821. [PMID: 33421554 DOI: 10.1016/j.pep.2021.105821] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 12/02/2020] [Accepted: 01/03/2021] [Indexed: 11/26/2022]
Abstract
Human SH2-containing inositol 5-phosphatase 2 (SHIP2) is a multi-domain protein playing essential roles in various physiological and pathological processes. In cell polarization and migration, SHIP2 serves as a RhoA effector for manipulating the level of phosphatidylinositol 3,4,5-trisphosphate. The domain between SH2 and a potential PH-R domain of SHIP2 was suggested to bind with GTP-bound form of RhoA. However, the structure of this RhoA-binding domain (RBD) of SHIP2 and the mechanism for its binding with RhoA remain unknown. In this study, SHIP2118-298 and SHIP2176-298, two truncated proteins harboring the RBD were designed, expressed, and purified successfully in E. coli. Unexpectedly, both SHIP2118-298 and SHIP2176-298 were determined to exist as homo-dimers in solution by multi-angle light scattering. Circular dichroism spectra indicated that both proteins predominantly consisted of α-helix structure. Moreover, in pull-down experiments, both proteins could bind with GTP-bound RhoA and RhoAQ63L, a mutant mimicing the state of GTP-bound RhoA. Importantly, in silico analysis showed that the shorter truncation, SHIP2176-298, contained all ordered residues between the SH2 and the PH-R domain, and matched the RhoA effector motif 1 of PKN1 well in sequence alignment, suggesting that SHIP2176-298 is sufficient for further studies on the structure and RhoA binding of SHIP2. This work shortens and confirms the main region of SHIP2 interacting with RhoA, provides the method for sample preparation, and presents preliminary information for SHIP2-RBD structure, which will facilitate the comprehensive understanding of the structure and function of SHIP2.
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Affiliation(s)
- Heng Zhou
- Department of Chemistry, College of Science, Huazhong Agricultural University, Wuhan, 430070, China; State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan, 430071, China
| | - Xiali Yue
- Department of Chemistry, College of Science, Huazhong Agricultural University, Wuhan, 430070, China.
| | - Zi Wang
- State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan, 430071, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shuangli Li
- State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan, 430071, China
| | - Jiang Zhu
- State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan, 430071, China.
| | - Yunhuang Yang
- State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan, 430071, China
| | - Maili Liu
- State Key Laboratory of Magnetic Resonance and Atomic Molecular Physics, Key Laboratory of Magnetic Resonance in Biological Systems, National Center for Magnetic Resonance in Wuhan, Wuhan Institute of Physics and Mathematics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan National Laboratory for Optoelectronics, Wuhan, 430071, China; University of Chinese Academy of Sciences, Beijing, 100049, China
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8
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Vincenzi M, Mercurio FA, Leone M. Sam Domains in Multiple Diseases. Curr Med Chem 2020; 27:450-476. [PMID: 30306850 DOI: 10.2174/0929867325666181009114445] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 07/26/2018] [Accepted: 08/27/2018] [Indexed: 12/13/2022]
Abstract
BACKGROUND The sterile alpha motif (Sam) domain is a small helical protein module, able to undergo homo- and hetero-oligomerization, as well as polymerization, thus forming different types of protein architectures. A few Sam domains are involved in pathological processes and consequently, they represent valuable targets for the development of new potential therapeutic routes. This study intends to collect state-of-the-art knowledge on the different modes by which Sam domains can favor disease onset and progression. METHODS This review was build up by searching throughout the literature, for: a) the structural properties of Sam domains, b) interactions mediated by a Sam module, c) presence of a Sam domain in proteins relevant for a specific disease. RESULTS Sam domains appear crucial in many diseases including cancer, renal disorders, cataracts. Often pathologies are linked to mutations directly positioned in the Sam domains that alter their stability and/or affect interactions that are crucial for proper protein functions. In only a few diseases, the Sam motif plays a kind of "side role" and cooperates to the pathological event by enhancing the action of a different protein domain. CONCLUSION Considering the many roles of the Sam domain into a significant variety of diseases, more efforts and novel drug discovery campaigns need to be engaged to find out small molecules and/or peptides targeting Sam domains. Such compounds may represent the pillars on which to build novel therapeutic strategies to cure different pathologies.
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Affiliation(s)
- Marian Vincenzi
- Institute of Biostructures and Bioimaging, National Research Council (CNR), Via Mezzocannone 16, 80134 Naples, Italy
| | - Flavia Anna Mercurio
- Institute of Biostructures and Bioimaging, National Research Council (CNR), Via Mezzocannone 16, 80134 Naples, Italy.,Cirpeb, InterUniversity Research Centre on Bioactive Peptides, University of Naples "Federico II", Via Mezzocannone, 16, 80134 Naples, Italy
| | - Marilisa Leone
- Institute of Biostructures and Bioimaging, National Research Council (CNR), Via Mezzocannone 16, 80134 Naples, Italy.,Cirpeb, InterUniversity Research Centre on Bioactive Peptides, University of Naples "Federico II", Via Mezzocannone, 16, 80134 Naples, Italy
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9
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Aβ modulates actin cytoskeleton via SHIP2-mediated phosphoinositide metabolism. Sci Rep 2019; 9:15557. [PMID: 31664099 PMCID: PMC6820556 DOI: 10.1038/s41598-019-51914-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2019] [Accepted: 10/02/2019] [Indexed: 12/22/2022] Open
Abstract
Emerging evidences suggest that phospholipid metabolism is altered in Alzheimer’s disease (AD), but molecular mechanisms on how this affects neurodegeneration in AD is poorly understood. SHIP2 is a phosphoinositide-metabolizing enzyme, which dephosphorylates PI(3,4,5)P3 resulting to PI(3,4)P2, and it has been recently shown that Aβ directly increases the activity of SHIP2. Here we monitored, utilizing fluorescent SHIP2 biosensor, real-time increase of PI(3,4)P2-containing vesicles in HT22 cells treated with Aβ. Interestingly, PI(3,4)P2 is accumulated at late endosomes and lysosomal vesicles. We further discovered that ARAP3 can be attracted to PI(3,4)P2-positive mature endosomes via its PH domain and this facilitates the degradation of ARAP3. The reduced level of ARAP3 then causes RhoA hyperactivation and filamentous actin, which are critical for neurodegeneration in AD. These results provide a novel molecular link between Aβ and actin disruption through dysregulated phosphoinositide metabolism, and the SHIP2-PI(3,4)P2-ARAP3-RhoA signaling pathway can be considered as new therapeutic targets for synaptic dysfunctions in Alzheimer’s disease.
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Neira JL, Díaz-García C, Prieto M, Coutinho A. The C-terminal SAM domain of p73 binds to the N terminus of MDM2. Biochim Biophys Acta Gen Subj 2019; 1863:760-770. [DOI: 10.1016/j.bbagen.2019.01.019] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Revised: 01/25/2019] [Accepted: 01/31/2019] [Indexed: 01/10/2023]
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11
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Design and analysis of EphA2-SAM peptide ligands: A multi-disciplinary screening approach. Bioorg Chem 2019; 84:434-443. [DOI: 10.1016/j.bioorg.2018.12.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 11/22/2018] [Accepted: 12/06/2018] [Indexed: 01/28/2023]
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12
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Wang Y, Shang Y, Li J, Chen W, Li G, Wan J, Liu W, Zhang M. Specific Eph receptor-cytoplasmic effector signaling mediated by SAM-SAM domain interactions. eLife 2018; 7:35677. [PMID: 29749928 PMCID: PMC5993539 DOI: 10.7554/elife.35677] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 05/10/2018] [Indexed: 02/06/2023] Open
Abstract
The Eph receptor tyrosine kinase (RTK) family is the largest subfamily of RTKs playing critical roles in many developmental processes such as tissue patterning, neurogenesis and neuronal circuit formation, angiogenesis, etc. How the 14 Eph proteins, via their highly similar cytoplasmic domains, can transmit diverse and sometimes opposite cellular signals upon engaging ephrins is a major unresolved question. Here, we systematically investigated the bindings of each SAM domain of Eph receptors to the SAM domains from SHIP2 and Odin, and uncover a highly specific SAM-SAM interaction-mediated cytoplasmic Eph-effector binding pattern. Comparative X-ray crystallographic studies of several SAM-SAM heterodimer complexes, together with biochemical and cell biology experiments, not only revealed the exquisite specificity code governing Eph/effector interactions but also allowed us to identify SAMD5 as a new Eph binding partner. Finally, these Eph/effector SAM heterodimer structures can explain many Eph SAM mutations identified in patients suffering from cancers and other diseases.
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Affiliation(s)
- Yue Wang
- Shenzhen Key Laboratory for Neuronal Structural Biology, Biomedical Research Institute, Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center, Shenzhen, China
| | - Yuan Shang
- Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Kowloon, China
| | - Jianchao Li
- Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Kowloon, China
| | - Weidi Chen
- Shenzhen Key Laboratory for Neuronal Structural Biology, Biomedical Research Institute, Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center, Shenzhen, China
| | - Gang Li
- Shenzhen Key Laboratory for Neuronal Structural Biology, Biomedical Research Institute, Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center, Shenzhen, China
| | - Jun Wan
- Shenzhen Key Laboratory for Neuronal Structural Biology, Biomedical Research Institute, Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center, Shenzhen, China.,Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Kowloon, China
| | - Wei Liu
- Shenzhen Key Laboratory for Neuronal Structural Biology, Biomedical Research Institute, Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center, Shenzhen, China
| | - Mingjie Zhang
- Shenzhen Key Laboratory for Neuronal Structural Biology, Biomedical Research Institute, Shenzhen Peking University-The Hong Kong University of Science and Technology Medical Center, Shenzhen, China.,Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Kowloon, China
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13
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Mercurio FA, Di Natale C, Pirone L, Iannitti R, Marasco D, Pedone EM, Palumbo R, Leone M. The Sam-Sam interaction between Ship2 and the EphA2 receptor: design and analysis of peptide inhibitors. Sci Rep 2017; 7:17474. [PMID: 29234063 PMCID: PMC5727260 DOI: 10.1038/s41598-017-17684-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Accepted: 11/21/2017] [Indexed: 12/21/2022] Open
Abstract
The lipid phosphatase Ship2 represents a drug discovery target for the treatment of different diseases, including cancer. Its C-terminal sterile alpha motif domain (Ship2-Sam) associates with the Sam domain from the EphA2 receptor (EphA2-Sam). This interaction is expected to mainly induce pro-oncogenic effects in cells therefore, inhibition of the Ship2-Sam/EphA2-Sam complex may represent an innovative route to discover anti-cancer therapeutics. In the present work, we designed and analyzed several peptide sequences encompassing the interaction interface of EphA2-Sam for Ship2-Sam. Peptide conformational analyses and interaction assays with Ship2-Sam conducted through diverse techniques (CD, NMR, SPR and MST), identified a positively charged penta-amino acid native motif in EphA2-Sam, that once repeated three times in tandem, binds Ship2-Sam. NMR experiments show that the peptide targets the negatively charged binding site of Ship2-Sam for EphA2-Sam. Preliminary in vitro cell-based assays indicate that -at 50 µM concentration- it induces necrosis of PC-3 prostate cancer cells with more cytotoxic effect on cancer cells than on normal dermal fibroblasts. This work represents a pioneering study that opens further opportunities for the development of inhibitors of the Ship2-Sam/EphA2-Sam complex for therapeutic applications.
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Affiliation(s)
- Flavia Anna Mercurio
- Institute of Biostructures and Bioimaging (IBB), CNR, via Mezzocannone 16, 80134, Naples, Italy
| | - Concetta Di Natale
- Department of Pharmacy, Research Centre on Bioactive Peptides (CIRPeB), University of Naples "Federico II", Via Mezzocannone 16, 80134, Naples, Italy
| | - Luciano Pirone
- Institute of Biostructures and Bioimaging (IBB), CNR, via Mezzocannone 16, 80134, Naples, Italy
| | - Roberta Iannitti
- Institute of Biostructures and Bioimaging (IBB), CNR, via Mezzocannone 16, 80134, Naples, Italy
| | - Daniela Marasco
- Institute of Biostructures and Bioimaging (IBB), CNR, via Mezzocannone 16, 80134, Naples, Italy.,Department of Pharmacy, Research Centre on Bioactive Peptides (CIRPeB), University of Naples "Federico II", Via Mezzocannone 16, 80134, Naples, Italy
| | - Emilia Maria Pedone
- Institute of Biostructures and Bioimaging (IBB), CNR, via Mezzocannone 16, 80134, Naples, Italy
| | - Rosanna Palumbo
- Institute of Biostructures and Bioimaging (IBB), CNR, via Mezzocannone 16, 80134, Naples, Italy
| | - Marilisa Leone
- Institute of Biostructures and Bioimaging (IBB), CNR, via Mezzocannone 16, 80134, Naples, Italy.
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14
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Mercurio FA, Costantini S, Di Natale C, Pirone L, Guariniello S, Scognamiglio PL, Marasco D, Pedone EM, Leone M. Structural investigation of a C-terminal EphA2 receptor mutant: Does mutation affect the structure and interaction properties of the Sam domain? BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2017; 1865:1095-1104. [DOI: 10.1016/j.bbapap.2017.06.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Revised: 05/03/2017] [Accepted: 06/05/2017] [Indexed: 12/25/2022]
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Thomas MP, Erneux C, Potter BVL. SHIP2: Structure, Function and Inhibition. Chembiochem 2017; 18:233-247. [DOI: 10.1002/cbic.201600541] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Mark P. Thomas
- Department of Pharmacy and Pharmacology; University of Bath; Claverton Down Bath BA2 7AY UK
| | - Christophe Erneux
- I.R.I.B.H.M.; Université Libre de Bruxelles; Campus Erasme 808 Route de Lennik 1070 Brussels Belgium
| | - Barry V. L. Potter
- Drug Discovery and Medicinal Chemistry; Department of Pharmacology; University of Oxford; Mansfield Road Oxford OX1 3QT UK
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Mercurio FA, Marasco D, Di Natale C, Pirone L, Costantini S, Pedone EM, Leone M. Targeting EphA2-Sam and Its Interactome: Design and Evaluation of Helical Peptides Enriched in Charged Residues. Chembiochem 2016; 17:2179-2188. [DOI: 10.1002/cbic.201600413] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Flavia A. Mercurio
- Institute of Biostructures and Bioimaging; National Research Council; Via Mezzocannone 16 80134 Naples Italy
| | - Daniela Marasco
- Institute of Biostructures and Bioimaging; National Research Council; Via Mezzocannone 16 80134 Naples Italy
- Department of Pharmacy; University of Naples “Federico II”; Via Mezzocannone 16 80134 Naples Italy
| | - Concetta Di Natale
- Department of Biology; University of Naples “Federico II”; Via Cinthia 4 80126 Naples Italy
| | - Luciano Pirone
- Institute of Biostructures and Bioimaging; National Research Council; Via Mezzocannone 16 80134 Naples Italy
| | - Susan Costantini
- CROM; IRCCS-Istituto Nazionale Tumori “Fondazione G. Pascale”; Via Mariano Semmola 52 80131 Naples Italy
| | - Emilia M. Pedone
- Institute of Biostructures and Bioimaging; National Research Council; Via Mezzocannone 16 80134 Naples Italy
| | - Marilisa Leone
- Institute of Biostructures and Bioimaging; National Research Council; Via Mezzocannone 16 80134 Naples Italy
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Kan W, Fang F, Chen L, Wang R, Deng Q. Influence of the R823W mutation on the interaction of the ANKS6-ANKS3: insights from molecular dynamics simulation and free energy analysis. J Biomol Struct Dyn 2016; 34:1113-22. [PMID: 26295479 DOI: 10.1080/07391102.2015.1071281] [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] [Indexed: 01/02/2023]
Abstract
The sterile alpha motif (SAM) domain of the protein ANKS6, a protein-protein interaction domain, is responsible for autosomal dominant polycystic kidney disease. Although the disease is the result of the R823W point mutation in the SAM domain of the protein ANKS6, the molecular details are still unclear. We applied molecular dynamics simulations, the principal component analysis, and the molecular mechanics Poisson-Boltzmann surface area binding free energy calculation to explore the structural and dynamic effects of the R823W point mutation on the complex ANKS6-ANKS3 (PDB ID: 4NL9) in comparison to the wild proteins. The energetic analysis presents that the wild type has a more stable structure than the mutant. The R823W point mutation not only disrupts the structure of the ANKS6 SAM domain but also negatively affects the interaction of the ANKS6-ANKS3. These results further clarify the previous experiments to understand the ANKS6-ANKS3 interaction comprehensively. In summary, this study would provide useful suggestions to understand the interaction of these proteins and their fatal action on mediating kidney function.
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Affiliation(s)
- Wei Kan
- a College of Chemistry and Chemical Engineering , Qiqihar University , Qiqihar 161006 , P.R. China
| | - Fengqin Fang
- a College of Chemistry and Chemical Engineering , Qiqihar University , Qiqihar 161006 , P.R. China
| | - Lin Chen
- a College of Chemistry and Chemical Engineering , Qiqihar University , Qiqihar 161006 , P.R. China
| | - Ruige Wang
- a College of Chemistry and Chemical Engineering , Qiqihar University , Qiqihar 161006 , P.R. China
| | - Qigang Deng
- a College of Chemistry and Chemical Engineering , Qiqihar University , Qiqihar 161006 , P.R. China
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18
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Taylor EB, Nayak DK, Quiniou SMA, Bengten E, Wilson M. Identification of SHIP-1 and SHIP-2 homologs in channel catfish, Ictalurus punctatus. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2015; 51:79-87. [PMID: 25743379 DOI: 10.1016/j.dci.2015.02.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Revised: 02/23/2015] [Accepted: 02/24/2015] [Indexed: 06/04/2023]
Abstract
Src homology domain 2 (SH2) domain-containing inositol 5'-phosphatases (SHIP) proteins have diverse roles in signal transduction. SHIP-1 and SHIP-2 homologs were identified in channel catfish, Ictalurus punctatus, based on sequence homology to murine and human SHIP sequences. Full-length cDNAs for catfish SHIP-1 and SHIP-2 (IpSHIP-1 and IpSHIP-2) were obtained using 5' and 3' RACE protocols. Catfish SHIP molecules share a high degree of sequence identity to their respective SHIP sequences from diverse taxa and both are encoded by single copy genes. IpSHIP-1 and IpSHIP-2 transcripts were expressed in all catfish tissues analyzed except for skin, and IpSHIP-1 message was more abundant than IpSHIP-2 message in lymphoid tissues. Catfish clonal B, cytotoxic T, and macrophage cell lines also expressed message for both molecules. IpSHIP-1 and IpSHIP-2 SH2 domains were expressed as recombinant proteins and were both found to be bound by cross-reacting rabbit anti-mouse SHIP-1 pAb. The anti-mouse SHIP-1 pAb also reacted with cell lysates from the cytotoxic T cell lines, macrophages and stimulated PBL. SHIP-1 is also phosphorylated at a conserved tyrosine residue, as shown by immunoprecipitation studies.
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Affiliation(s)
- Erin B Taylor
- Department of Microbiology, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Deepak K Nayak
- Department of Microbiology, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Sylvie M A Quiniou
- Warmwater Aquaculture Research Unit, USDA-ARS, Stoneville, MS 38776, USA
| | - Eva Bengten
- Department of Microbiology, University of Mississippi Medical Center, Jackson, MS 39216, USA
| | - Melanie Wilson
- Department of Microbiology, University of Mississippi Medical Center, Jackson, MS 39216, USA.
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19
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Mercurio FA, Di Natale C, Pirone L, Scognamiglio PL, Marasco D, Pedone EM, Saviano M, Leone M. Peptide Fragments of Odin-Sam1: Conformational Analysis and Interaction Studies with EphA2-Sam. Chembiochem 2015; 16:1629-36. [DOI: 10.1002/cbic.201500197] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2015] [Indexed: 11/09/2022]
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20
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Song Y, Jiang J, Vermeren S, Tong W. ARAP3 functions in hematopoietic stem cells. PLoS One 2014; 9:e116107. [PMID: 25542002 PMCID: PMC4277471 DOI: 10.1371/journal.pone.0116107] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2014] [Accepted: 12/05/2014] [Indexed: 11/25/2022] Open
Abstract
ARAP3 is a GTPase-activating protein (GAP) that inactivates Arf6 and RhoA small GTPases. ARAP3 deficiency in mice causes a sprouting angiogenic defect resulting in embryonic lethality by E11. Mice with an ARAP3 R302,303A mutation (Arap3KI/KI) that prevents activation by phosphoinositide-3-kinase (PI3K) have a similar angiogenic phenotype, although some animals survive to adulthood. Here, we report that hematopoietic stem cells (HSCs) from rare adult Arap3KI/KI bone marrow are compromised in their ability to reconstitute recipient mice and to self-renew. To elucidate the potential cell-autonomous and non-cell-autonomous roles of ARAP3 in hematopoiesis, we conditionally deleted Arap3 in hematopoietic cells and in several cell types within the HSC niche. Excision of Arap3 in hematopoietic cells using Vav1-Cre does not alter the ability of ARAP3-deficient progenitor cells to proliferate and differentiate in vitro or ARAP3-deficient HSCs to provide multi-lineage reconstitution and to undergo self-renewal in vivo. Thus, our data suggest that ARAP3 does not play a cell-autonomous role in HSPCs. Deletion of Arap3 in osteoblasts and mesenchymal stromal cells using Prx1-Cre resulted in no discernable phenotypes in hematopoietic development or HSC homeostasis in adult mice. In contrast, deletion of Arap3 using vascular endothelial cadherin (VEC or Cdh5)-driven Cre resulted in embryonic lethality, however HSCs from surviving adult mice were largely normal. Reverse transplantations into VEC-driven Arap3 conditional knockout mice revealed no discernable difference in HSC frequencies or function in comparison to control mice. Taken together, our investigation suggests that despite a critical role for ARAP3 in embryonic vascular development, its loss in endothelial cells minimally impacts HSCs in adult bone marrow.
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Affiliation(s)
- Yiwen Song
- Department of Pediatrics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
- Division of Hematology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Jing Jiang
- Division of Hematology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
| | - Sonja Vermeren
- MRC Centre for Inflammation Research, The Queen's Medical Research Institute, The University of Edinburgh, United Kingdom
| | - Wei Tong
- Department of Pediatrics, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, United States of America
- Division of Hematology, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, United States of America
- * E-mail:
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21
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Neira JL. Structural dissection of the C-terminal sterile alpha motif (SAM) of human p73. Arch Biochem Biophys 2014; 558:133-42. [DOI: 10.1016/j.abb.2014.07.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2014] [Revised: 07/01/2014] [Accepted: 07/06/2014] [Indexed: 10/25/2022]
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Mercurio FA, Scognamiglio PL, Di Natale C, Marasco D, Pellecchia M, Leone M. CD and NMR conformational studies of a peptide encompassing the Mid Loop interface of Ship2-Sam. Biopolymers 2014; 101:1088-98. [DOI: 10.1002/bip.22512] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Revised: 05/23/2014] [Accepted: 05/23/2014] [Indexed: 11/07/2022]
Affiliation(s)
| | - Pasqualina L. Scognamiglio
- Department of Pharmacy; University "Federico II"; Naples Italy
- Centro Interuniversitario di Ricerca sui Peptidi Bioattivi (CIRPEB); Naples Italy
- IIT Italian Institute of Technology; Naples Italy
| | - Concetta Di Natale
- Department of Pharmacy; University "Federico II"; Naples Italy
- IIT Italian Institute of Technology; Naples Italy
| | - Daniela Marasco
- Institute of Biostructures and Bioimaging (CNR); Naples Italy
- Department of Pharmacy; University "Federico II"; Naples Italy
- Centro Interuniversitario di Ricerca sui Peptidi Bioattivi (CIRPEB); Naples Italy
| | | | - Marilisa Leone
- Institute of Biostructures and Bioimaging (CNR); Naples Italy
- Centro Interuniversitario di Ricerca sui Peptidi Bioattivi (CIRPEB); Naples Italy
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23
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Characterization of the SAM domain of the PKD-related protein ANKS6 and its interaction with ANKS3. BMC STRUCTURAL BIOLOGY 2014; 14:17. [PMID: 24998259 PMCID: PMC4105859 DOI: 10.1186/1472-6807-14-17] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/28/2014] [Accepted: 06/30/2014] [Indexed: 11/10/2022]
Abstract
BACKGROUND Autosomal dominant polycystic kidney disease (ADPKD) is the most common genetic disorder leading to end-stage renal failure in humans. In the PKD/Mhm(cy/+) rat model of ADPKD, the point mutation R823W in the sterile alpha motif (SAM) domain of the protein ANKS6 is responsible for disease. SAM domains are known protein-protein interaction domains, capable of binding each other to form polymers and heterodimers. Despite its physiological importance, little is known about the function of ANKS6 and how the R823W point mutation leads to PKD. Recent work has revealed that ANKS6 interacts with a related protein called ANKS3. Both ANKS6 and ANKS3 have a similar domain structure, with ankyrin repeats at the N-terminus and a SAM domain at the C-terminus. RESULTS The SAM domain of ANKS3 is identified as a direct binding partner of the ANKS6 SAM domain. We find that ANKS3-SAM polymerizes and ANKS6-SAM can bind to one end of the polymer. We present crystal structures of both the ANKS3-SAM polymer and the ANKS3-SAM/ANKS6-SAM complex, revealing the molecular details of their association. We also learn how the R823W mutation disrupts ANKS6 function by dramatically destabilizing the SAM domain such that the interaction with ANKS3-SAM is lost. CONCLUSIONS ANKS3 is a direct interacting partner of ANKS6. By structurally and biochemically characterizing the interaction between the ANKS3 and ANKS6 SAM domains, our work provides a basis for future investigation of how the interaction between these proteins mediates kidney function.
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Abstract
Phosphoinositides are the phosphorylated derivatives of phosphatidylinositol, and play a very significant role in a diverse range of signaling processes in eukaryotic cells. A number of phosphoinositide-metabolizing enzymes, including phosphoinositide-kinases and phosphatases are involved in the synthesis and degradation of these phospholipids. Recently, the function of various phosphatases in the phosphatidylinositol signaling pathway has been of great interest. In the present review we summarize the structural insights and biochemistry of various phosphatases in regulating phosphoinositide metabolism.
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Affiliation(s)
- Young Jun Kim
- Department of Biotechnology, Konkuk University, Chungju, Korea
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25
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Mercurio FA, Marasco D, Pirone L, Scognamiglio PL, Pedone EM, Pellecchia M, Leone M. Heterotypic Sam-Sam association between Odin-Sam1 and Arap3-Sam: binding affinity and structural insights. Chembiochem 2012; 14:100-6. [PMID: 23239578 DOI: 10.1002/cbic.201200592] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2012] [Indexed: 11/07/2022]
Abstract
Arap3 is a phosphatidylinositol 3 kinase effector protein that plays a role as GTPase activator (GAP) for Arf6 and RhoA. Arap3 contains a sterile alpha motif (Sam) domain that has high sequence homology with the Sam domain of the EphA2-receptor (EphA2-Sam). Both Arap3-Sam and EphA2-Sam are able to associate with the Sam domain of the lipid phosphatase Ship2 (Ship2-Sam). Recently, we reported a novel interaction between the first Sam domain of Odin (Odin-Sam1), a protein belonging to the ANKS (ANKyrin repeat and Sam domain containing) family, and EphA2-Sam. In our latest work, we applied NMR spectroscopy, surface plasmon resonance (SPR) and isothermal titration calorimetry (ITC) to characterize the association between Arap3-Sam and Odin-Sam1. We show that these two Sam domains interact with low micromolar affinity. Moreover, by means of molecular docking techniques, supported by NMR data, we demonstrate that Odin-Sam1 and Arap3-Sam might bind with a topology that is common to several Sam-Sam complexes. The revealed structural details form the basis for the design of potential peptide antagonists that could be used as chemical tools to investigate functional aspects related to heterotypic Arap3-Sam associations.
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Affiliation(s)
- Flavia A Mercurio
- Department of Biological Sciences, University of Naples Federico II, Via Mezzocannone 16, 80134 Naples, Italy
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Mercurio FA, Marasco D, Pirone L, Pedone EM, Pellecchia M, Leone M. Solution structure of the first Sam domain of Odin and binding studies with the EphA2 receptor. Biochemistry 2012; 51:2136-45. [PMID: 22332920 DOI: 10.1021/bi300141h] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The EphA2 receptor plays key roles in many physiological and pathological events, including cancer. The process of receptor endocytosis and the consequent degradation have attracted attention as possible means of overcoming the negative outcomes of EphA2 in cancer cells and decreasing tumor malignancy. A recent study indicates that Sam (sterile alpha motif) domains of Odin, a member of the ANKS (ankyrin repeat and sterile alpha motif domain-containing) family of proteins, are important for the regulation of EphA2 endocytosis. Odin contains two tandem Sam domains (Odin-Sam1 and -Sam2). Herein, we report on the nuclear magnetic resonance (NMR) solution structure of Odin-Sam1; through a variety of assays (employing NMR, surface plasmon resonance, and isothermal titration calorimetry techniques), we clearly demonstrate that Odin-Sam1 binds to the Sam domain of EphA2 in the low micromolar range. NMR chemical shift perturbation experiments and molecular modeling studies point out that the two Sam domains interact with a head-to-tail topology characteristic of several Sam-Sam complexes. This binding mode is similar to that we have previously proposed for the association between the Sam domains of the lipid phosphatase Ship2 and EphA2. This work further validates structural elements relevant for the heterotypic Sam-Sam interactions of EphA2 and provides novel insights for the design of potential therapeutic compounds that can modulate receptor endocytosis.
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Affiliation(s)
- Flavia Anna Mercurio
- Department of Biological Sciences, University of Naples Federico II, Naples, Italy
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27
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Falconer RJ, Collins BM. Survey of the year 2009: applications of isothermal titration calorimetry. J Mol Recognit 2010; 24:1-16. [DOI: 10.1002/jmr.1073] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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