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de la Fuente MC, Ageitos L, Lages MA, Martínez-Matamoros D, Forero AM, Balado M, Lemos ML, Rodríguez J, Jiménez C. Structural Requirements for Ga 3+ Coordination in Synthetic Analogues of the Siderophore Piscibactin Deduced by Chemical Synthesis and Density Functional Theory Calculations. Inorg Chem 2023; 62:7503-7514. [PMID: 37140938 DOI: 10.1021/acs.inorgchem.3c00787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
Stereoselective total synthesis of several analogues of piscibactin (Pcb), the siderophore produced by different pathogenic Gram-negative bacteria, was performed. The acid-sensitive α-methylthiazoline moiety was replaced by a more stable thiazole ring, differing in the configuration of the OH group at the C-13 position. The ability of these Pcb analogues to form complexes with Ga3+ as a mimic of Fe3+ showed that the configuration of the hydroxyl group at C-13 as 13S is crucial for the chelation of Ga3+ to preserve the metal coordination, while the presence of a thiazole ring instead of the α-methylthiazoline moiety does not affect such coordination. A complete 1H and 13C NMR chemical shift assignment of the diastereoisomer mixtures around C9/C10 was done for diagnostic stereochemical disposition. Additionally, density functional theory calculations were performed not only for confirming the stereochemistry of the Ga3+ complex among the six possible diastereoisomers but also for deducing the ability of these to form octahedral coordination spheres with gallium. Finally, the lack of antimicrobial activity of Pcb and Pcb thiazole analogue Ga3+ complexes against Vibrio anguillarum agrees with one of the roles of siderophores in protecting pathogens from metal ion toxicity. The efficient metal coordination shown by this scaffold suggests its possible use as a starting point for the design of new chelating agents or vectors for the development of new antibacterials that exploit the "Trojan horse" strategy using the microbial iron uptake mechanisms. The results obtained will be of great help in the development of biotechnological applications for these types of compounds.
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Affiliation(s)
- M Carmen de la Fuente
- CICA─Centro Interdisciplinar de Química e Bioloxía, Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña 15071, Spain
| | - Lucía Ageitos
- CICA─Centro Interdisciplinar de Química e Bioloxía, Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña 15071, Spain
| | - Marta A Lages
- Departamento de Microbiología y Parasitología, Instituto de Acuicultura, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Spain
| | - Diana Martínez-Matamoros
- CICA─Centro Interdisciplinar de Química e Bioloxía, Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña 15071, Spain
| | - Abel M Forero
- CICA─Centro Interdisciplinar de Química e Bioloxía, Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña 15071, Spain
| | - Miguel Balado
- Departamento de Microbiología y Parasitología, Instituto de Acuicultura, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Spain
| | - Manuel L Lemos
- Departamento de Microbiología y Parasitología, Instituto de Acuicultura, Universidade de Santiago de Compostela, Santiago de Compostela 15782, Spain
| | - Jaime Rodríguez
- CICA─Centro Interdisciplinar de Química e Bioloxía, Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña 15071, Spain
| | - Carlos Jiménez
- CICA─Centro Interdisciplinar de Química e Bioloxía, Departamento de Química, Facultade de Ciencias, Universidade da Coruña, A Coruña 15071, Spain
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Entirely S-protected thiolated hydroxyethylcellulose: Design of a dual cross-linking approach for hydrogels. Eur J Pharm Biopharm 2022; 181:292-299. [PMID: 36427674 DOI: 10.1016/j.ejpb.2022.11.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Revised: 11/17/2022] [Accepted: 11/18/2022] [Indexed: 11/25/2022]
Abstract
AIM The aim of this study was the synthesis and evaluation of entirely S-protected thiolated hydroxyethylcellulose (HEC) with low and high viscosity, as well as thiolated poly-L-lysine (poly-L-Lys) used as dual-acting ionic as well as thiol-disulfide exchange mediated cross-linking hydrogel. METHODS Bis(mercaptosuccinic acid) was covalently attached to low and high viscous HECs via Fisher esterification, obtaining S-protected polymers. Poly-L-Lys-cysteine was synthesized via amidation of poly-L-Lys-HBr with cysteine (Cys). Thiolated polymers were examined in terms of cytotoxicity and rheological behavior of hydrogels containing these thiomers was evaluated with a cone-plate rheometer. RESULTS Thiomers showed less cytotoxicity compared to the corresponding unmodified polymers. Rheological studies showed that cross-linking occurred between the two polymers via thiol-disulfide exchange reactions facilitated by the complementary charges. Employing poly-L-Lys-Cys in a concentration of either 0.5 or 5% (m/v) resulted in a 34.5-fold or 17.3-fold as well as a 53.6-fold or 29.6-fold improvement in dynamic viscosity within 5 min at 37 °C on S-protected thiolated low and high viscous HEC, compared to the corresponding unmodified HECs, respectively. CONCLUSION By the combination of anionic S-protected thiolated polymers with a cationic thiolated polymer, dual-acting hydrogels exhibiting a time dependent increase in viscosity can be designed.
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Takeuchi R, Ogihara K, Fujimoto J, Sato K, Mase N, Yoshimura K, Harada S, Narumi T. Design, synthesis, and bio-evaluation of novel triterpenoid derivatives as anti-HIV-1 compounds. Bioorg Med Chem Lett 2022; 69:128768. [PMID: 35513221 DOI: 10.1016/j.bmcl.2022.128768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 04/25/2022] [Accepted: 04/27/2022] [Indexed: 11/02/2022]
Abstract
Two betulinic acid derivatives, RPR103611 (2) and IC9564 (3) were previously reported to be potent HIV-1 entry inhibitors. In this current study, a SAR study of the triterpenoid moiety of 2 and 3 has been performed and an oleanolic acid derivative (4) was identified as a novel HIV-1 entry inhibitor. In addition, the combination of 4 with several-type of HIV-1 neutralizing antibodies provided significant synergistic effects. The synthetic utility of the CC double bond in the C-ring of 4 was also demonstrated to develop the 12-keto-type oleanolic acid derivative (5) as a potent anti-HIV compound. This simple transformation led to a significantly increased anti-HIV activity and a reduced cytotoxicity of the compound.
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Affiliation(s)
- Reon Takeuchi
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka, Japan
| | - Kasumi Ogihara
- Course of Applied Chemistry and Biochemical Engineering, Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka, Japan
| | - Junko Fujimoto
- Department of Applied Chemistry and Biochemical Engineering, Faculty of Engineering, Shizuoka University, Shizuoka, Japan
| | - Kohei Sato
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka, Japan; Course of Applied Chemistry and Biochemical Engineering, Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka, Japan; Department of Applied Chemistry and Biochemical Engineering, Faculty of Engineering, Shizuoka University, Shizuoka, Japan
| | - Nobuyuki Mase
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka, Japan; Course of Applied Chemistry and Biochemical Engineering, Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka, Japan; Department of Applied Chemistry and Biochemical Engineering, Faculty of Engineering, Shizuoka University, Shizuoka, Japan; Research Institute of Green Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka, Japan
| | - Kazuhisa Yoshimura
- Institute of Public Health, Bureau of Social Welfare and Public Health, Tokyo Metropolitan Government, 3-24-1 Hyakunin-cho, Shinjuku-ku, Tokyo, Japan; AIDS Research Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, Japan
| | - Shigeyoshi Harada
- AIDS Research Center, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo, Japan.
| | - Tetsuo Narumi
- Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka, Japan; Course of Applied Chemistry and Biochemical Engineering, Department of Engineering, Graduate School of Integrated Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka, Japan; Department of Applied Chemistry and Biochemical Engineering, Faculty of Engineering, Shizuoka University, Shizuoka, Japan; Research Institute of Green Science and Technology, Shizuoka University, 3-5-1 Johoku, Hamamatsu, Shizuoka, Japan.
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4
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Bulatov T, Gensel S, Mainz A, Dang T, Koller TO, Voigt K, Ebeling J, Wilson DN, Genersch E, Süssmuth RD. Total Synthesis and Biological Evaluation of Paenilamicins from the Honey Bee Pathogen Paenibacillus larvae. J Am Chem Soc 2021; 144:288-296. [PMID: 34968060 DOI: 10.1021/jacs.1c09616] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Paenilamicins are a group of complex polycationic peptide secondary metabolites with antibacterial and antifungal activities produced by the devastating honey bee brood pathogen Paenibacillus larvae causing the lethal brood disease American Foulbrood (AFB). Here, we report the convergent total synthesis and structural revision of paenilamicin B2. Specific stereoisomers of paenilamicin B2 were synthesized for unambiguous confirmation of the natural product structure and for evaluation of biological activities. These studies revealed the N-terminal fragment of paenilamicin as an important pharmacophore. Infection assays using bee larvae and the insect pathogen Bacillus thuringiensis demonstrated that paenilamicins outcompete bacterial competitors in the ecological niche of P. larvae. Finally, we show first data that classifies paenilamicins as potential ribosome inhibitors. Hence, our synthesis route is a further step for understanding the pathogenicity of P. larvae and for thorough structure-activity-relationship as well as mode-of-action studies in the near future.
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Affiliation(s)
- Timur Bulatov
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany
| | - Sebastian Gensel
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany
| | - Andi Mainz
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany
| | - Tam Dang
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany
| | - Timm O Koller
- Institut für Biochemie und Molekularbiologie, Universität Hamburg, 20146 Hamburg, Germany
| | - Kerstin Voigt
- Jena Microbial Resource Collection (JMRC), Hans-Knöll-Institut, Adolf-Reichwein-Straße 23, 07745 Jena, Germany
| | - Julia Ebeling
- Institute for Bee Research, Friedrich-Engels-Strasse 32, 16540 Hohen Neuendorf, Germany
| | - Daniel N Wilson
- Institut für Biochemie und Molekularbiologie, Universität Hamburg, 20146 Hamburg, Germany
| | - Elke Genersch
- Institute for Bee Research, Friedrich-Engels-Strasse 32, 16540 Hohen Neuendorf, Germany
| | - Roderich D Süssmuth
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 124, 10623 Berlin, Germany
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5
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Hartmann RW, Fahrner R, Shevshenko D, Fyrknäs M, Larsson R, Lehmann F, Odell LR. Rational Design of Azastatin as a Potential ADC Payload with Reduced Bystander Killing. ChemMedChem 2020; 15:2500-2512. [PMID: 33063934 PMCID: PMC7756782 DOI: 10.1002/cmdc.202000497] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Indexed: 12/11/2022]
Abstract
Auristatins are a class of ultrapotent microtubule inhibitors, whose growing clinical popularity in oncology is based upon their use as payloads in antibody-drug conjugates (ADCs). The most widely utilized auristatin, MMAE, has however been shown to cause apoptosis in non-pathological cells proximal to the tumour ("bystander killing"). Herein, we introduce azastatins, a new class of auristatin derivatives encompassing a side chain amine for antibody conjugation. The synthesis of Cbz-azastatin methyl ester, which included the C2-elongation and diastereoselective reduction of two proteinogenic amino acids as key transformations, was accomplished in 22 steps and 0.76 % overall yield. While Cbz-protected azastatin methyl ester (0.13-3.0 nM) inhibited proliferation more potently than MMAE (0.47-6.5 nM), removal of the Cbz-group yielded dramatically increased IC50 -values (9.8-170 nM). We attribute the reduced apparent cytotoxicity of the deprotected azastatin methyl esters to a lack of membrane permeability. These results clearly establish the azastatins as a novel class of cytotoxic payloads ideally suited for use in next-generation ADC development.
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Affiliation(s)
- Rafael W. Hartmann
- Department of Medicinal ChemistryUppsala UniversityBox 57475123UppsalaSweden
| | - Raphael Fahrner
- Synthesis DivisionRecipharm OT ChemistryVirdings allé 32b75450UppsalaSweden
| | - Denys Shevshenko
- Synthesis DivisionRecipharm OT ChemistryVirdings allé 32b75450UppsalaSweden
| | - Mårten Fyrknäs
- Department of Medical SciencesCancer Pharmacology and Computational MedicineUppsala UniversityUniversity Hospital75185UppsalaSweden
| | - Rolf Larsson
- Department of Medical SciencesCancer Pharmacology and Computational MedicineUppsala UniversityUniversity Hospital75185UppsalaSweden
| | - Fredrik Lehmann
- Synthesis DivisionRecipharm OT ChemistryVirdings allé 32b75450UppsalaSweden
| | - Luke R. Odell
- Department of Medicinal ChemistryUppsala UniversityBox 57475123UppsalaSweden
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Kanamori Y, Iwasaki A, Sumimoto S, Matsubara T, Sato T, Suenaga K. Izenamides A and B, Statine-Containing Depsipeptides, and an Analogue from a Marine Cyanobacterium. JOURNAL OF NATURAL PRODUCTS 2018; 81:1673-1681. [PMID: 29944370 DOI: 10.1021/acs.jnatprod.8b00417] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Izenamides A, B, and C (1-3), new linear depsipeptides, were isolated from a taxonomically distinct marine cyanobacterium. Izenamides A and B contain a statine moiety [(3 S,4 S)-4-amino-3-hydroxy-6-methylheptanoic acid] and inhibited the activity of cathepsin D, an aspartic peptidase. Meanwhile, izenamides did not show growth-inhibitory activity against HeLa, HL60, or MCF-7 cells at up to 10 μM.
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Affiliation(s)
- Yuki Kanamori
- Department of Chemistry, Faculty of Science and Technology , Keio University , 3-14-1 Hiyoshi , Ko-hoku-ku, Yokohama , Kanagawa 223-8522 , Japan
| | - Arihiro Iwasaki
- Department of Chemistry, Faculty of Science and Technology , Keio University , 3-14-1 Hiyoshi , Ko-hoku-ku, Yokohama , Kanagawa 223-8522 , Japan
| | - Shimpei Sumimoto
- Department of Chemistry, Faculty of Science and Technology , Keio University , 3-14-1 Hiyoshi , Ko-hoku-ku, Yokohama , Kanagawa 223-8522 , Japan
| | - Teruhiko Matsubara
- Department of Biosciences and Informatics, Faculty of Science and Technology , Keio University , 3-14-1 Hiyoshi , Kohoku-ku, Yokohama , Kanagawa 223-8522 , Japan
| | - Toshinori Sato
- Department of Biosciences and Informatics, Faculty of Science and Technology , Keio University , 3-14-1 Hiyoshi , Kohoku-ku, Yokohama , Kanagawa 223-8522 , Japan
| | - Kiyotake Suenaga
- Department of Chemistry, Faculty of Science and Technology , Keio University , 3-14-1 Hiyoshi , Ko-hoku-ku, Yokohama , Kanagawa 223-8522 , Japan
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7
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Zhou W, Nie XD, Zhang Y, Si CM, Zhou Z, Sun X, Wei BG. A practical approach to asymmetric synthesis of dolastatin 10. Org Biomol Chem 2018; 15:6119-6131. [PMID: 28682414 DOI: 10.1039/c7ob01395g] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Dolastatin 10, an antineoplastic agent for cancer chemotherapy, is a linear peptide possessing N,N-dimethyl Val-OH, l-valine, (3R,4S,5S)-dolaisoleucine, (2R,3R,4S)-dolaproine and (S)-dolaphenine. Our efficient synthesis includes the following three key features: (1) SmI2-induced cross-coupling was employed to couple aldehyde 11 with (S)-N-tert-butanesulfinyl imine 12 to generate the required stereocenters of Dap (7); (2) asymmetric addition of chiral N-sulfinyl imine 10 provided a straightforward approach to the synthesis of the protected Doe ((S,S)-8); (3) a practical method to the key subunit Val-Dil (24a) has been established as an alternative synthetic route for the synthesis of this challenging chemical structure.
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Affiliation(s)
- Wen Zhou
- School of Pharmacy and Institutes of Biomedical Sciences, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China.
| | - Xiao-Di Nie
- School of Pharmacy and Institutes of Biomedical Sciences, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China.
| | - Yu Zhang
- College of Energy, Xiangan campus of Xiamen University, Xiamen, Fujian 361102, China
| | - Chang-Mei Si
- School of Pharmacy and Institutes of Biomedical Sciences, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China.
| | - Zhu Zhou
- School of Pharmacy and Institutes of Biomedical Sciences, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China.
| | - Xun Sun
- School of Pharmacy and Institutes of Biomedical Sciences, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China.
| | - Bang-Guo Wei
- School of Pharmacy and Institutes of Biomedical Sciences, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China.
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8
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Al-Awadhi FH, Law BK, Paul VJ, Luesch H. Grassystatins D-F, Potent Aspartic Protease Inhibitors from Marine Cyanobacteria as Potential Antimetastatic Agents Targeting Invasive Breast Cancer. JOURNAL OF NATURAL PRODUCTS 2017; 80:2969-2986. [PMID: 29087712 PMCID: PMC5764543 DOI: 10.1021/acs.jnatprod.7b00551] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Three new modified peptides named grassystatins D-F (1-3) were discovered from a marine cyanobacterium from Guam. Their structures were elucidated using NMR spectroscopy and mass spectrometry. The hallmark structural feature in the peptides is a statine unit, which contributes to their aspartic protease inhibitory activity preferentially targeting cathepsins D and E. Grassystatin F (3) was the most potent analogue, with IC50 values of 50 and 0.5 nM against cathepsins D and E, respectively. The acidic tumor microenvironment is known to increase the activation of some of the lysosomal proteases associated with tumor metastasis such as cathepsins. Because cathepsin D is a biomarker in aggressive forms of breast cancer and linked to poor prognosis, the effects of cathepsin D inhibition by 1 and 3 on the downstream cellular substrates cystatin C and PAI-1 were investigated. Furthermore, the functional relevance of targeting cathepsin D substrates was evaluated by examining the effect of 1 and 3 on the migration of MDA-MD-231 cells. Grassystatin F (3) inhibited the cleavage of cystatin C and PAI-1, the activities of their downstream targets cysteine cathepsins and tPA, and the migration of the highly aggressive triple negative breast cancer cells, phenocopying the effect of siRNA-mediated knockdown of cathepsin D.
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Affiliation(s)
- Fatma H. Al-Awadhi
- Department of Medicinal Chemistry, University of Florida, 1345 Center Drive, Gainesville, Florida 32610, United States
- Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, 1345 Center Drive, Gainesville, Florida 32610, United States
| | - Brian K. Law
- Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, 1345 Center Drive, Gainesville, Florida 32610, United States
- Department of Pharmacology and Therapeutics, University of Florida, 1600 Archer Road, Gainesville, Florida 32610, United States
| | - Valerie J. Paul
- Smithsonian Marine Station, 701 Seaway Drive, Fort Pierce, Florida 34949, United States
| | - Hendrik Luesch
- Department of Medicinal Chemistry, University of Florida, 1345 Center Drive, Gainesville, Florida 32610, United States
- Center for Natural Products, Drug Discovery and Development (CNPD3), University of Florida, 1345 Center Drive, Gainesville, Florida 32610, United States
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9
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Shao LP, Si CM, Mao ZY, Zhou W, Molinski TF, Wei BG, Lin GQ. Synthesis and Structure Revision of Symplocin A. Org Chem Front 2017; 4:995-1004. [PMID: 31007934 DOI: 10.1039/c7qo00052a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Symplocin A, a linear peptide possessing N-terminal N,N-dimethylisoleucine, statine, and valic acid residues, has been synthesized for the first time employing our previously established 'one-pot intramolecular tandem protocol'. Moreover, the stereochemistry of natural symplocin A was unambiguously revised through the confirmation by 1D NMR, 2D NMR, and HPLC comparisons with authentic natural product.
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Affiliation(s)
- Lu-Ping Shao
- Department of Natural Products Chemistry, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China
| | - Chang-Mei Si
- Department of Natural Products Chemistry, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China
| | - Zhuo-Ya Mao
- Department of Natural Products Chemistry, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China
| | - Wen Zhou
- Department of Natural Products Chemistry, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China
| | - Tadeusz F Molinski
- Department of Chemistry and Biochemistry and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, 9500 Gilman Dr, La Jolla, California 92093-0358, United States
| | - Bang-Guo Wei
- Department of Natural Products Chemistry, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China
| | - Guo-Qiang Lin
- Department of Natural Products Chemistry, School of Pharmacy, Fudan University, 826 Zhangheng Road, Shanghai, 201203, China
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10
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Dhavan AA, Kaduskar RD, Musso L, Scaglioni L, Martino PA, Dallavalle S. Total synthesis of leopolic acid A, a natural 2,3-pyrrolidinedione with antimicrobial activity. Beilstein J Org Chem 2016; 12:1624-8. [PMID: 27559415 PMCID: PMC4979754 DOI: 10.3762/bjoc.12.159] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Accepted: 07/14/2016] [Indexed: 11/23/2022] Open
Abstract
The first total synthesis of leopolic acid A, a fungal metabolite with a rare 2,3-pyrrolidinedione nucleus linked to an ureido dipeptide, was designed and carried out. Crucial steps for the strategy include a Dieckmann cyclization to obtain the 2,3-pyrrolidinedione ring and a Wittig olefination to install the polymethylene chain. An oxazolidinone-containing leopolic acid A analogue was also synthesized. The antibacterial activity showed by both compounds suggests that they could be considered as promising candidates for future developments.
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Affiliation(s)
- Atul A Dhavan
- Department of Food, Environmental and Nutritional Sciences, Division of Chemistry and Molecular Biology, Università degli Studi di Milano, via Celoria 2, I-20133 Milano, Italy
| | - Rahul D Kaduskar
- Department of Food, Environmental and Nutritional Sciences, Division of Chemistry and Molecular Biology, Università degli Studi di Milano, via Celoria 2, I-20133 Milano, Italy
| | - Loana Musso
- Department of Food, Environmental and Nutritional Sciences, Division of Chemistry and Molecular Biology, Università degli Studi di Milano, via Celoria 2, I-20133 Milano, Italy
| | - Leonardo Scaglioni
- Department of Food, Environmental and Nutritional Sciences, Division of Chemistry and Molecular Biology, Università degli Studi di Milano, via Celoria 2, I-20133 Milano, Italy
| | - Piera Anna Martino
- Department of Veterinary Medicine - Microbiology and Immunology, Università degli Studi di Milano, via Celoria 10, I-20133 Milano, Italy
| | - Sabrina Dallavalle
- Department of Food, Environmental and Nutritional Sciences, Division of Chemistry and Molecular Biology, Università degli Studi di Milano, via Celoria 2, I-20133 Milano, Italy
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11
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Tasiamide F, a potent inhibitor of cathepsins D and E from a marine cyanobacterium. Bioorg Med Chem 2016; 24:3276-82. [PMID: 27211244 DOI: 10.1016/j.bmc.2016.04.062] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 04/28/2016] [Accepted: 04/29/2016] [Indexed: 11/21/2022]
Abstract
In search of novel protease inhibitors with therapeutic potential, our efforts exploring the marine cyanobacterium Lyngbya sp. have led to the discovery of tasiamide F (1), which is an analogue of tasiamide B (2). The structure was elucidated using a combination of NMR spectroscopy and mass spectrometry. The key structural feature in 1 is the presence of the Phe-derived statine core, which contributes to its aspartic protease inhibitory activity. The antiproteolytic activity of 1 and 2 was evaluated in vitro against cathepsins D and E, and BACE1. Tasiamide F (1) displayed IC50 values of 57nM, 23nM, and 0.69μM, respectively, indicating greater selectivity for cathepsins over BACE1 compared with tasiamide B (2). Molecular docking experiments were carried out for compounds 1 and 2 against cathepsins D and E to rationalize their activity towards these proteases. The dysregulated activities of cathepsins D and E have been implicated in cancer and modulation of immune responses, respectively, and these proteases represent potential therapeutic targets.
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12
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Design, synthesis and biological evaluation of tasiamide B derivatives as BACE1 inhibitors. Bioorg Med Chem 2015; 23:1963-74. [PMID: 25842365 DOI: 10.1016/j.bmc.2015.03.034] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2015] [Revised: 03/10/2015] [Accepted: 03/11/2015] [Indexed: 01/05/2023]
Abstract
Nineteen new derivatives based on the structure of marine natural product tasiamide B were designed, synthesized, and evaluated for their inhibitory activity against BACE1, a potential therapeutic target for Alzheimer's disease. The hydrophobic substituents Val at P₃ position, Leu at P₁' position, Ala at P₂' position, and Phe at P₃' position were found to significantly affect the inhibition. Free carboxylic acid at C-terminus was also found to be important to the activity. In addition, the structure-activity relationships (SARs) were supported by molecular docking simulation.
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Sun Y, Takada K, Nogi Y, Okada S, Matsunaga S. Lower homologues of ahpatinin, aspartic protease inhibitors, from a marine Streptomyces sp. JOURNAL OF NATURAL PRODUCTS 2014; 77:1749-1752. [PMID: 24960234 DOI: 10.1021/np500337m] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Two linear peptides, ahpatinin Ac (1) and ahpatinin Pr (2), were isolated together with the known ahpatinin (i)Bu, pepstatin Ac, pepstatin Pr, and pepsinostreptin from a Streptomyces sp. derived from a deep-sea sediment. The structure of ahpatinin Pr (2) was assigned by interpretation of NMR data and HPLC analysis of the hydrolysate after converting to the DNP-L-Val derivative. During the LCMS analysis of the acid hydrolysate, products arising from the retro-aldol cleavage of the statine and Ahppa units in 2 were observed and could facilitate the determination of the absolute configuration of the statine class of nonproteinogenic amino acids. Both ahpatinin Ac (1) and ahpatinin Pr (2) potently inhibited pepsin and moderately inhibited cathepsin B.
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Affiliation(s)
- Yi Sun
- Laboratory of Aquatic Natural Products Chemistry, Graduate School of Agricultural and Life Sciences, The University of Tokyo , Bunkyo-ku, Tokyo 113-8657, Japan
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14
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Um S, Pyee Y, Kim EH, Lee SK, Shin J, Oh DC. Thalassospiramide G, a new γ-amino-acid-bearing peptide from the marine bacterium Thalassospira sp. Mar Drugs 2013; 11:611-22. [PMID: 23442790 PMCID: PMC3705361 DOI: 10.3390/md11030611] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 01/29/2013] [Accepted: 02/06/2013] [Indexed: 01/05/2023] Open
Abstract
In the chemical investigation of marine unicellular bacteria, a new peptide, thalassospiramide G (1), along with thalassospiramides A and D (2–3), was discovered from a large culture of Thalassospira sp. The structure of thalassospiramide G, bearing γ-amino acids, such as 4-amino-5-hydroxy-penta-2-enoic acid (AHPEA), 4-amino-3,5-dihydroxy-pentanoic acid (ADPA), and unique 2-amino-1-(1H-indol-3-yl)ethanone (AIEN), was determined via extensive spectroscopic analysis. The absolute configuration of thalassospiramide D (3), including 4-amino-3-hydroxy-5-phenylpentanoic acid (AHPPA), was rigorously determined by 1H–1H coupling constant analysis and chemical derivatization. Thalassospiramides A and D (2–3) inhibited nitric oxide (NO) production in lipopolysaccharide (LPS)-stimulated mouse macrophage RAW 264.7 cells, with IC50 values of 16.4 and 4.8 μM, respectively.
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Affiliation(s)
- Soohyun Um
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, Korea; E-Mails: (S.U.); (Y.P.); (S.K.L.); (J.S.)
| | - Yuna Pyee
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, Korea; E-Mails: (S.U.); (Y.P.); (S.K.L.); (J.S.)
| | - Eun-Hee Kim
- Division of Magnetic Resonance, Korea Basic Science Institute, Ochang, Chungbuk 363-883, Korea; E-Mail:
| | - Sang Kook Lee
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, Korea; E-Mails: (S.U.); (Y.P.); (S.K.L.); (J.S.)
| | - Jongheon Shin
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, Korea; E-Mails: (S.U.); (Y.P.); (S.K.L.); (J.S.)
| | - Dong-Chan Oh
- Natural Products Research Institute, College of Pharmacy, Seoul National University, Seoul 151-742, Korea; E-Mails: (S.U.); (Y.P.); (S.K.L.); (J.S.)
- Author to whom correspondence should be addressed; E-Mail: ; Tel.: +82-2-880-2491; Fax: +82-2-762-8322
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15
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Lee J, Currano JN, Carroll PJ, Joullié MM. Didemnins, tamandarins and related natural products. Nat Prod Rep 2012; 29:404-24. [PMID: 22270031 DOI: 10.1039/c2np00065b] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Since the discovery and isolation of the didemnin family of marine depsipeptides in 1981, the synthesis and biological activity of its congeners have been of great interest to the scientific community. The didemnins have demonstrated antitumor, antiviral, and immunosuppressive activity at low nano- and femtomolar levels. Of the congeners, didemnin B was the first marine natural product to reach phase II clinical trials in the United States, stimulating many analogue syntheses to date. About two decades later, tamandarins A and B were isolated, and were found to possess very similar structure and biological activity to that of the didemnin B. These compounds have shown impressive biological activity and some progress has been made in establishing structure-activity relationships. However, their molecular mechanism of action still remains unclear. This review highlights the long-standing study of didemnins and its critical application towards the understanding of the molecular mechanism of action of tamandarins and their potential use as therapeutic agents.
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Affiliation(s)
- Jisun Lee
- University of Pennsylvania, Department of Chemistry, Philadelphia, Pennsylvania, United States
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16
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Benelkebir H, Donlevy AM, Packham G, Ganesan A. Total synthesis and stereochemical assignment of burkholdac B, a depsipeptide HDAC inhibitor. Org Lett 2011; 13:6334-7. [PMID: 22091906 DOI: 10.1021/ol202197q] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Three diastereomers of burkholdac B were prepared by total synthesis, enabling the full stereochemical assignment of the natural product. It is proposed that burkholdac B is identical to thailandepsin A independently isolated by Cheng from the same strain of Burkholderia thailandensis . Burkholdac B is the most potent among depsipeptide histone deacetylase inhibitors in growth inhibition of the MCF7 breast cancer cell line with an IC(50) of 60 pM.
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Affiliation(s)
- Hanae Benelkebir
- School of Pharmacy, University of East Anglia, Norwich Research Park, Norwich NR4 7TJ, United Kingdom
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17
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Liang Z, Sorribas A, Sulzmaier FJ, Jiménez JI, Wang X, Sauvage T, Yoshida WY, Wang G, Ramos JW, Williams PG. Stictamides A-C, MMP12 inhibitors containing 4-amino-3-hydroxy-5-phenylpentanoic acid subunits. J Org Chem 2011; 76:3635-43. [PMID: 21500817 DOI: 10.1021/jo200241h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
An extensive study of the secondary metabolites produced by a new Sticta sp. of lichen has led to the isolation of three new compounds containing the 4-amino-3-hydroxy-5-phenylpentanoic acid residue (Ahppa). The structures of stictamides A-C (1-3) were assigned by 2D NMR spectroscopic and chemical methods. Due to extensive epimerization of the Ahppa residue observed after acid hydrolysis, the configuration of this unit was deduced through conversion of 1 to an appropriate derivative and application of our recently developed statine NMR database. Evaluation of stictamide A against a panel of disease-relevant proteases showed that it inhibited MMP12 at 2.3 μM and significantly reduced invasion in the human glioma cell line U87MG. Docking studies suggest that stictamide A inhibits MMP12 by a non-zinc-binding mechanism.
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Affiliation(s)
- Zhibin Liang
- Departmentsof Chemistry, University of Hawaii at Manoa, Honolulu, Hawaii 96822, United States
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18
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Schmidt EW, Donia MS. Life in cellulose houses: symbiotic bacterial biosynthesis of ascidian drugs and drug leads. Curr Opin Biotechnol 2010; 21:827-33. [PMID: 21050742 PMCID: PMC2992989 DOI: 10.1016/j.copbio.2010.10.006] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2010] [Revised: 10/11/2010] [Accepted: 10/12/2010] [Indexed: 11/20/2022]
Abstract
Ascidians (tunicates; sea squirts) are sources of diverse, bioactive natural products, one of which is an approved drug and many of which are potent drug leads. It has been shown that symbiotic bacteria living with ascidians produce some of the bioactive compounds isolated from whole animals, and indirect evidence strongly implicates symbiotic bacteria in the synthesis of many others. However, for the majority the producing organism has not been identified. In cases where a symbiotic origin has been definitively assigned, the resulting data lead to improved paths to drug discovery and development from marine animals. This review traces evidence for symbiotic production where such evidence exists and describes the strengths and limitations of that evidence.
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Affiliation(s)
- Eric W Schmidt
- Department of Medicinal Chemistry, University of Utah, Salt Lake City, UT 84112, USA.
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Matthew S, Salvador LA, Schupp PJ, Paul VJ, Luesch H. Cytotoxic halogenated macrolides and modified peptides from the apratoxin-producing marine cyanobacterium Lyngbya bouillonii from Guam. JOURNAL OF NATURAL PRODUCTS 2010; 73:1544-52. [PMID: 20704304 PMCID: PMC2965600 DOI: 10.1021/np1004032] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Collections of the marine cyanobacterium Lyngbya bouillonii from shallow patch reefs in Apra Harbor, Guam, afforded three hitherto undescribed analogues of the glycosidic macrolide lyngbyaloside, namely, 2-epi-lyngbyaloside (1) and the regioisomeric 18E- and 18Z-lyngbyalosides C (2 and 3). Concurrently we discovered two new analogues of the cytoskeletal actin-disrupting lyngbyabellins, 27-deoxylyngbyabellin A (4) and lyngbyabellin J (5), a novel macrolide of the laingolide family, laingolide B (6), and a linear modified peptide, lyngbyapeptin D (7), along with known lyngbyabellins A and B, lyngbyapeptin A, and lyngbyaloside. The structures of 1-7 were elucidated by a combination of NMR spectroscopic and mass spectrometric analysis. Compounds 1-6 were either brominated (1-3) or chlorinated (4-6), consistent with halogenation being a hallmark of many marine natural products. All extracts derived from these L. bouillonii collections were highly cytotoxic due to the presence of apratoxin A or apratoxin C. Compounds 1-5 showed weak to moderate cytotoxicity to HT29 colorectal adenocarcinoma and HeLa cervical carcinoma cells.
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Affiliation(s)
- Susan Matthew
- Department of Medicinal Chemistry, University of Florida, 1600 SW Archer Road, Gainesville, Florida 32610
| | - Lilibeth A. Salvador
- Department of Medicinal Chemistry, University of Florida, 1600 SW Archer Road, Gainesville, Florida 32610
| | - Peter J. Schupp
- University of Guam Marine Laboratory, UOG Station, Mangilao, Guam 96923
| | - Valerie J. Paul
- Smithsonian Marine Station, 701 Seaway Drive, Fort Pierce, Florida 34949
| | - Hendrik Luesch
- Department of Medicinal Chemistry, University of Florida, 1600 SW Archer Road, Gainesville, Florida 32610
- To whom correspondence should be addressed. Tel.: (352) 273-7738, Fax: (352) 273-7741,
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Bandyopadhyay A, Agrawal N, Mali SM, Jadhav SV, Gopi HN. Tin(ii) chloride assisted synthesis of N-protected γ-amino β-keto esters through semipinacol rearrangement. Org Biomol Chem 2010; 8:4855-60. [DOI: 10.1039/c0ob00199f] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Kwan JC, Eksioglu EA, Liu C, Paul VJ, Luesch H. Grassystatins A-C from marine cyanobacteria, potent cathepsin E inhibitors that reduce antigen presentation. J Med Chem 2009; 52:5732-47. [PMID: 19715320 DOI: 10.1021/jm9009394] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
In our efforts to explore marine cyanobacteria as a source of novel bioactive compounds, we discovered a statine unit-containing linear decadepsipeptide, grassystatin A (1), which we screened against a diverse set of 59 proteases. We describe the structure determination of 1 and two natural analogues, grassystatins B (2) and C (3), using NMR, MS, and chiral HPLC techniques. Compound 1 selectively inhibited cathepsins D and E with IC(50)s of 26.5 nM and 886 pM, respectively. Compound 2 showed similar potency and selectivity against cathepsins D and E (IC(50)s of 7.27 nM and 354 pM, respectively), whereas the truncated peptide analogue grassystatin C (3), which consists of two fewer residues than 1 and 2, was less potent against both but still selective for cathepsin E. The selectivity of compounds 1-3 for cathepsin E over D (20-38-fold) suggests that these natural products may be useful tools to probe cathepsin E function. We investigated the structural basis of this selectivity using molecular docking. We also show that 1 can reduce antigen presentation by dendritic cells, a process thought to rely on cathepsin E.
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Affiliation(s)
- Jason C Kwan
- Department of Medicinal Chemistry, University of Florida, Gainesville, Florida 32610, USA
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