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Sagini MN, Zepp M, Eyol E, Ali DM, Gromova S, Dahlmann M, Behrens D, Groeschel C, Tischmeier L, Hoffmann J, Berger MR, Forssmann WG. EPI-X4, a CXCR4 antagonist inhibits tumor growth in pancreatic cancer and lymphoma models. Peptides 2024; 175:171111. [PMID: 38036098 DOI: 10.1016/j.peptides.2023.171111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 10/20/2023] [Accepted: 10/25/2023] [Indexed: 12/02/2023]
Abstract
Endogenous peptide inhibitor for CXCR4 (EPI-X4) is a CXCR4 antagonist with potential for cancer therapy. It is a processed fragment of serum albumin from the hemofiltrate of dialysis patients. This study reports the efficacy of fifteen EPI-X4 derivatives in pancreatic cancer and lymphoma models. In vitro, the peptides were investigated for antiproliferation (cytotoxicity) by MTT assay. The mRNA expression for CXCR4 and CXCL12 was determined by RT-PCR, chip array and RNA sequencing. Chip array analysis yielded 634 genes associated with CXCR4/CXCL12 signaling. About 21% of these genes correlated with metastasis in the context of cell motility, proliferation, and survival. Expression levels of these genes were altered in pancreatic cancer (36%), lymphoma models (53%) and in patients' data (58%). EPI-X4 derivatives failed to inhibit cell proliferation due to low expression of CXCR4 in vitro, but inhibited tumor growth in the bioassays with significant efficacy. In the pancreatic cancer model, EPI-X4a, f and k inhibited mean tumor growth by > 50% and even caused complete remissions. In the lymphoma model, EPI-X4b, n and p inhibited mean tumor growth by > 70% and caused stable disease. Given the non-toxic and non-immunogenic properties of EPI-X4, these findings underscore its status as a promising therapy of pancreatic cancer and lymphoma and warrant further studies. SIMPLE SUMMARY: This study examined the value of chemokine receptor CXCR4 as an antineoplastic target for the endogenous peptide inhibitor of CXCR4 (EPI-X4), a 12-meric peptide derived from serum albumin. EPI-X4 inhibits CXCR4 interaction with its natural ligand, CXCL12 (SDF1). Therefore, malignancies (including pancreatic cancer and lymphoma) that depend on the CXCR4/CXCL12 pathway for progression can be targeted with EPI-X4. Of 634 genes that were linked to the CXCR4/CXCL12 pathway, 21% were associated with metastasis. In cultured human Suit2-007 pancreatic cancer cells, CXCR4 showed low to undetectable expression, which was why EPI-X4 did not inhibit pancreatic cancer cell proliferation. These findings were different in vivo, where CXCR4 was highly expressed and EPI-X4 inhibited tumor growth in rodents harboring pancreatic cancer or lymphoma. In the pancreatic cancer model, EPI-X4 derivatives a, f and k caused complete remissions, while in lymphomas EPI-X4 derivatives b, n and p caused stable disease.
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Affiliation(s)
- Micah N Sagini
- Toxicology and Chemotherapy Unit, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Michael Zepp
- Toxicology and Chemotherapy Unit, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Ergül Eyol
- Toxicology and Chemotherapy Unit, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Doaa M Ali
- Toxicology and Chemotherapy Unit, German Cancer Research Centre (DKFZ), Heidelberg, Germany
| | - Svetlana Gromova
- EPO, Experimental Pharmacology & Oncology Berlin-Buch GmbH, Germany
| | - Mathias Dahlmann
- EPO, Experimental Pharmacology & Oncology Berlin-Buch GmbH, Germany
| | - Diana Behrens
- EPO, Experimental Pharmacology & Oncology Berlin-Buch GmbH, Germany
| | - Christian Groeschel
- NeoPep Pharma GmbH & Co. KG., Hannover, Germany and Hannover Medical School, Department of Internal Medicine, Germany
| | - Linus Tischmeier
- NeoPep Pharma GmbH & Co. KG., Hannover, Germany and Hannover Medical School, Department of Internal Medicine, Germany
| | - Jens Hoffmann
- EPO, Experimental Pharmacology & Oncology Berlin-Buch GmbH, Germany
| | - Martin R Berger
- Toxicology and Chemotherapy Unit, German Cancer Research Centre (DKFZ), Heidelberg, Germany.
| | - Wolf-Georg Forssmann
- NeoPep Pharma GmbH & Co. KG., Hannover, Germany and Hannover Medical School, Department of Internal Medicine, Germany.
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Cano-Garrido O, Álamo P, Sánchez-García L, Falgàs A, Sánchez-Chardi A, Serna N, Parladé E, Unzueta U, Roldán M, Voltà-Durán E, Casanova I, Villaverde A, Mangues R, Vázquez E. Biparatopic Protein Nanoparticles for the Precision Therapy of CXCR4 + Cancers. Cancers (Basel) 2021; 13:cancers13122929. [PMID: 34208189 PMCID: PMC8230831 DOI: 10.3390/cancers13122929] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 05/28/2021] [Accepted: 06/07/2021] [Indexed: 01/05/2023] Open
Abstract
Simple Summary Aimed at minimizing side toxicities cancer therapies require appropriate functional vehicles at the nanoscale, for receptor-mediated tumor-targeted drug delivery. The aim of the present study was to explore the human peptide EPI-X4 as a CXCR4-targeting agent in self-assembled, protein-only nanoparticles. While the systemic tumor biodistribution of EPI-X4-based materials is modest, this peptide shows potent proapoptotic effects on CXCR4+ cancer cells. Interestingly, the in vivo selectivity of EPI-X4 was dramatically improved, once combined into biparatopic nanoparticles, with a second CXCR4 ligand, the peptide T22. Biparatopic nanoparticles promote a highly selective tumor destruction in a mouse model of human colorectal cancer, probably associated to the CXCR4 antagonist role of EPI-X4. This study not only validates a new human ligand of the tumoral marker CXCR4, but it also offers a novel strategy for the combination, in protein nanoparticles, of dual acting ligands of tumoral markers for highly selective drug delivery. Abstract The accumulated molecular knowledge about human cancer enables the identification of multiple cell surface markers as highly specific therapeutic targets. A proper tumor targeting could significantly avoid drug exposure of healthy cells, minimizing side effects, but it is also expected to increase the therapeutic index. Specifically, colorectal cancer has a particularly poor prognosis in late stages, being drug targeting an appropriate strategy to substantially improve the therapeutic efficacy. In this study, we have explored the potential of the human albumin-derived peptide, EPI-X4, as a suitable ligand to target colorectal cancer via the cell surface protein CXCR4, a chemokine receptor overexpressed in cancer stem cells. To explore the potential use of this ligand, self-assembling protein nanoparticles have been generated displaying an engineered EPI-X4 version, which conferred a modest CXCR4 targeting and fast and high level of cell apoptosis in tumor CXCR4+ cells, in vitro and in vivo. In addition, when EPI-X4-based building blocks are combined with biologically inert polypeptides containing the CXCR4 ligand T22, the resulting biparatopic nanoparticles show a dramatically improved biodistribution in mouse models of CXCR4+ human cancer, faster cell internalization and enhanced target cell death when compared to the version based on a single ligand. The generation of biparatopic materials opens exciting possibilities in oncotherapies based on high precision drug delivery based on the receptor CXCR4.
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Affiliation(s)
- Olivia Cano-Garrido
- Nanoligent SL, Edifici EUREKA, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain; (O.C.-G.); (N.S.)
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain; (L.S.-G.); (E.P.); (E.V.-D.)
| | - Patricia Álamo
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), C/Monforte de Lemos 3-5, 28029 Madrid, Spain; (P.Á.); (A.F.); (U.U.); (I.C.)
- Instituto de Investigación Biomédica Sant Pau (IIB Sant Pau), Sant Antoni Ma Claret 167, 08025 Barcelona, Spain
- Instituto de Investigación Contra la Leucemia Josep Carreras, 08025 Barcelona, Spain
| | - Laura Sánchez-García
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain; (L.S.-G.); (E.P.); (E.V.-D.)
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), C/Monforte de Lemos 3-5, 28029 Madrid, Spain; (P.Á.); (A.F.); (U.U.); (I.C.)
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain
| | - Aïda Falgàs
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), C/Monforte de Lemos 3-5, 28029 Madrid, Spain; (P.Á.); (A.F.); (U.U.); (I.C.)
- Instituto de Investigación Biomédica Sant Pau (IIB Sant Pau), Sant Antoni Ma Claret 167, 08025 Barcelona, Spain
- Instituto de Investigación Contra la Leucemia Josep Carreras, 08025 Barcelona, Spain
| | - Alejandro Sánchez-Chardi
- Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Facultat de Biologia, Universitat de Barcelona, Av. Diagonal 643, 08028 Barcelona, Spain;
- Servei de Microscòpia, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain
| | - Naroa Serna
- Nanoligent SL, Edifici EUREKA, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain; (O.C.-G.); (N.S.)
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain; (L.S.-G.); (E.P.); (E.V.-D.)
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), C/Monforte de Lemos 3-5, 28029 Madrid, Spain; (P.Á.); (A.F.); (U.U.); (I.C.)
| | - Eloi Parladé
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain; (L.S.-G.); (E.P.); (E.V.-D.)
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), C/Monforte de Lemos 3-5, 28029 Madrid, Spain; (P.Á.); (A.F.); (U.U.); (I.C.)
| | - Ugutz Unzueta
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), C/Monforte de Lemos 3-5, 28029 Madrid, Spain; (P.Á.); (A.F.); (U.U.); (I.C.)
- Instituto de Investigación Biomédica Sant Pau (IIB Sant Pau), Sant Antoni Ma Claret 167, 08025 Barcelona, Spain
- Instituto de Investigación Contra la Leucemia Josep Carreras, 08025 Barcelona, Spain
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain
| | - Mònica Roldán
- Unitat de Microscòpia Confocal i Imatge Cel·lular, Servei de Medicina Genètica i Molecular, Institut Pediàtric de Malalties Rares (IPER), Hospital Sant Joan de Déu, Esplugues de Llobregat, 08950 Barcelona, Spain;
- Institut de Recerca Sant Joan de Déu, Esplugues de Llobregat, 08950 Barcelona, Spain
| | - Eric Voltà-Durán
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain; (L.S.-G.); (E.P.); (E.V.-D.)
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), C/Monforte de Lemos 3-5, 28029 Madrid, Spain; (P.Á.); (A.F.); (U.U.); (I.C.)
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain
| | - Isolda Casanova
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), C/Monforte de Lemos 3-5, 28029 Madrid, Spain; (P.Á.); (A.F.); (U.U.); (I.C.)
- Instituto de Investigación Biomédica Sant Pau (IIB Sant Pau), Sant Antoni Ma Claret 167, 08025 Barcelona, Spain
- Instituto de Investigación Contra la Leucemia Josep Carreras, 08025 Barcelona, Spain
| | - Antonio Villaverde
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain; (L.S.-G.); (E.P.); (E.V.-D.)
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), C/Monforte de Lemos 3-5, 28029 Madrid, Spain; (P.Á.); (A.F.); (U.U.); (I.C.)
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain
- Correspondence: (A.V.); (R.M.); (E.V.)
| | - Ramón Mangues
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), C/Monforte de Lemos 3-5, 28029 Madrid, Spain; (P.Á.); (A.F.); (U.U.); (I.C.)
- Instituto de Investigación Biomédica Sant Pau (IIB Sant Pau), Sant Antoni Ma Claret 167, 08025 Barcelona, Spain
- Instituto de Investigación Contra la Leucemia Josep Carreras, 08025 Barcelona, Spain
- Correspondence: (A.V.); (R.M.); (E.V.)
| | - Esther Vázquez
- Institut de Biotecnologia i de Biomedicina, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain; (L.S.-G.); (E.P.); (E.V.-D.)
- CIBER de Bioingeniería, Biomateriales y Nanomedicina (CIBER-BBN), C/Monforte de Lemos 3-5, 28029 Madrid, Spain; (P.Á.); (A.F.); (U.U.); (I.C.)
- Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, Bellaterra, 08193 Barcelona, Spain
- Correspondence: (A.V.); (R.M.); (E.V.)
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Gilg A, Harms M, Olari LR, Urbanowitz AK, Bonig H, Münch J. Absence of the CXCR4 antagonist EPI-X4 from pharmaceutical human serum albumin preparations. J Transl Med 2021; 19:190. [PMID: 33941197 PMCID: PMC8094565 DOI: 10.1186/s12967-021-02859-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Accepted: 04/26/2021] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Endogenous Peptide Inhibitor of CXCR4 (EPI-X4) is a natural antagonist of the CXC chemokine receptor 4 (CXCR4). EPI-X4 is a 16-mer peptide that is released from human serum albumin (HSA) by acidic aspartic proteases such as Cathepsin D and E. Since human serum albumin (HSA) is an important medicinal substance we asked whether different pharmaceutical HSA products contain EPI-X4 which could have been generated during manufacturing and whether HSA can serve as a substrate for cathepsins despite of the presence of stabilizers like caprylate. METHODS Eight pharmaceutical HSA preparations representing all currently used fractionation technologies were analyzed. The previously described specific EPI-X4 ELISA was used for quantification; in vitro EPI-X4 generation by acidification in the presence or absence of cathepsins was followed by quantification with ELISA. RESULTS None of the pharmaceutical HSA preparations tested contained EPI-X4. Acidification of HSA did not generate EPI-X4. Addition of cathepsins D and E to acidified HSA yielded high concentrations of EPI-X4 in all HSA preparations, indistinguishable between individual products. CONCLUSION Medicinal HSA preparations per se do not contain EPI-X4, but will replenish its precursor which can be cleaved to EPI-X4 in vivo, environmental conditions permitting.
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Affiliation(s)
- Andrea Gilg
- Institute of Molecular Virology, Ulm University Medical Center, 89081, Ulm, Germany
| | - Mirja Harms
- Institute of Molecular Virology, Ulm University Medical Center, 89081, Ulm, Germany
| | - Lia-Raluca Olari
- Institute of Molecular Virology, Ulm University Medical Center, 89081, Ulm, Germany
| | - Ann-Kathrin Urbanowitz
- German Red Cross Blood Donor Service Baden-Wuerttemberg-Hessen, Institute Frankfurt, 60528, Frankfurt, Germany
| | - Halvard Bonig
- German Red Cross Blood Donor Service Baden-Wuerttemberg-Hessen, Institute Frankfurt, 60528, Frankfurt, Germany.
- Institute for Transfusion Medicine and Immunohematology, Goethe University, 60528, Frankfurt, Germany.
- Dept. of Medicine, Div. of Hematology, University of Washington, Seattle, WA, 98195, USA.
| | - Jan Münch
- Institute of Molecular Virology, Ulm University Medical Center, 89081, Ulm, Germany.
- Core Facility Functional Peptidomics, Ulm University Medical Center, 89081, Ulm, Germany.
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Kaiser LM, Harms M, Sauter D, Rawat VPS, Glitscher M, Hildt E, Tews D, Hunter Z, Münch J, Buske C. Targeting of CXCR4 by the Naturally Occurring CXCR4 Antagonist EPI-X4 in Waldenström's Macroglobulinemia. Cancers (Basel) 2021; 13:826. [PMID: 33669329 PMCID: PMC7920274 DOI: 10.3390/cancers13040826] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2020] [Revised: 02/05/2021] [Accepted: 02/11/2021] [Indexed: 12/31/2022] Open
Abstract
CXCR4 expression and downstream signaling have been identified as key factors in malignant hematopoiesis. Thus, up to 40% of all patients with Waldenström's macroglobulinemia (WM) carry an activating mutation of CXCR4 that leads to a more aggressive clinical course and inferior outcome upon treatment with the Bruton's tyrosine kinase inhibitor ibrutinib. Nevertheless, little is known about physiological mechanisms counteracting CXCR4 signaling in hematopoietic neoplasms. Recently, the endogenous human peptide EPI-X4 was identified as a natural CXCR4 antagonist that effectively blocks CXCL12-mediated receptor internalization and suppresses the migration and invasion of cancer cells towards a CXCL12 gradient. Here, we demonstrate that EPI-X4 efficiently binds to CXCR4 of WM cells and decreases their migration towards CXCL12. The CXCR4 inhibitory activity of EPI-X4 is accompanied by reduced expression of genes involved in MAPK signaling and energy metabolism. Notably, the anti-WM activity of EPI-X4 could be further augmented by the rational design of EPI-X4 derivatives showing higher binding affinity to CXCR4. In summary, these data demonstrate that a naturally occurring anti-CXCR4 peptide is able to interfere with WM cell behaviour, and that optimized derivatives of EPI-X4 may represent a promising approach in suppressing growth promoting CXCR4 signaling in WM.
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Affiliation(s)
- Lisa Marie Kaiser
- Comprehensive Cancer Center Ulm, Institute of Experimental Cancer Research, University Hospital Ulm, 89081 Ulm, Germany; (L.M.K.); (V.P.S.R.)
| | - Mirja Harms
- Institute of Molecular Virology, Ulm University Medical Center, 89081 Ulm, Germany; (M.H.); (D.S.); (J.M.)
| | - Daniel Sauter
- Institute of Molecular Virology, Ulm University Medical Center, 89081 Ulm, Germany; (M.H.); (D.S.); (J.M.)
- Institute for Medical Virology and Epidemiology of Viral Diseases, University Hospital Tübingen, 72076 Tübingen, Germany
| | - Vijay P. S. Rawat
- Comprehensive Cancer Center Ulm, Institute of Experimental Cancer Research, University Hospital Ulm, 89081 Ulm, Germany; (L.M.K.); (V.P.S.R.)
- Special Centre for Molecular Medicine, Jawaharlal Nehru University, Delhi 110067, India
| | - Mirco Glitscher
- Department of Virology, Paul-Ehrlich-Institute, 63225 Langen, Germany; (M.G.); (E.H.)
| | - Eberhard Hildt
- Department of Virology, Paul-Ehrlich-Institute, 63225 Langen, Germany; (M.G.); (E.H.)
| | - Daniel Tews
- Department of Pediatrics and Adolescent Medicine, University Hospital Ulm, 89081 Ulm, Germany;
| | - Zachary Hunter
- Bing Center for Waldenström’s Macroglobulinemia, Boston, MA 02215, USA;
| | - Jan Münch
- Institute of Molecular Virology, Ulm University Medical Center, 89081 Ulm, Germany; (M.H.); (D.S.); (J.M.)
| | - Christian Buske
- Comprehensive Cancer Center Ulm, Institute of Experimental Cancer Research, University Hospital Ulm, 89081 Ulm, Germany; (L.M.K.); (V.P.S.R.)
- Department of Internal Medicine III, University Hospital Ulm, 89081 Ulm, Germany
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Romero-Molina S, Ruiz-Blanco YB, Harms M, Münch J, Sanchez-Garcia E. PPI-Detect: A support vector machine model for sequence-based prediction of protein-protein interactions. J Comput Chem 2019; 40:1233-1242. [PMID: 30768790 DOI: 10.1002/jcc.25780] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 11/29/2018] [Accepted: 12/29/2018] [Indexed: 12/18/2022]
Abstract
The prediction of peptide-protein or protein-protein interactions (PPI) is a challenging task, especially if amino acid sequences are the only information available. Machine learning methods allow us to exploit the information content in PPI datasets. However, the numerical codification of these datasets often influences the performance of data mining approaches. Here, we introduce a procedure for the general-purpose numerical codification of polypeptides. This procedure transforms pairs of amino acid sequences into a machine learning-friendly vector, whose elements represent numerical descriptors of residues in proteins. We used this numerical encoding procedure for the development of a support vector machine model (PPI-Detect), which allows predicting whether two proteins will interact or not. PPI-Detect (https://ppi-detect.zmb.uni-due.de/) outperforms state of the art sequence-based predictors of PPI. We employed PPI-Detect for the analysis of derivatives of EPI-X4, an endogenous peptide inhibitor of CXCR4, a G-protein-coupled receptor. There, we identified with high accuracy those peptides which bind better than EPI-X4 to the receptor. Also using PPI-Detect, we designed a novel peptide and then experimentally established its anti-CXCR4 activity. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Sandra Romero-Molina
- Center of Medical Biotechnology, University of Duisburg-Essen, Duisburg, Germany
| | - Yasser B Ruiz-Blanco
- Center of Medical Biotechnology, University of Duisburg-Essen, Duisburg, Germany
| | - Mirja Harms
- Institute of Molecular Virology, Ulm University Medical Center, Ulm, Germany
| | - Jan Münch
- Institute of Molecular Virology, Ulm University Medical Center, Ulm, Germany.,Core Facility Functional Peptidomics, Ulm University Medical Center, Ulm, Germany
| | - Elsa Sanchez-Garcia
- Center of Medical Biotechnology, University of Duisburg-Essen, Duisburg, Germany
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