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Efimova SS, Ostroumova OS. Antibiotic Loaded Phytosomes as a Way to Develop Innovative Lipid Formulations of Polyene Macrolides. Pharmaceutics 2024; 16:665. [PMID: 38794328 DOI: 10.3390/pharmaceutics16050665] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2024] [Revised: 05/06/2024] [Accepted: 05/14/2024] [Indexed: 05/26/2024] Open
Abstract
BACKGROUND The threat of antibiotic resistance of fungal pathogens and the high toxicity of the most effective drugs, polyene macrolides, force us to look for new ways to develop innovative antifungal formulations. OBJECTIVE The aim of this study was to determine how the sterol, phospholipid, and flavonoid composition of liposomal forms of polyene antibiotics, and in particular, amphotericin B (AmB), affects their ability to increase the permeability of lipid bilayers that mimic the membranes of mammalian and fungal cells. METHODS To monitor the membrane permeability induced by various polyene-based lipid formulations, a calcein leakage assay and the electrophysiological technique based on planar lipid bilayers were used. KEY RESULTS The replacement of cholesterol with its biosynthetic precursor, 7-dehydrocholesterol, led to a decrease in the ability of AmB-loaded liposomes to permeabilize lipid bilayers mimicking mammalian cell membranes. The inclusion of plant flavonoid phloretin in AmB-loaded liposomes increased the ability of the formulation to disengage a fluorescent marker from lipid vesicles mimicking the membranes of target fungi. I-V characteristics of the fungal-like lipid bilayers treated with the AmB phytosomes were symmetric, demonstrating the functioning of double-length AmB pores and assuming a decrease in the antibiotic threshold concentration. CONCLUSIONS AND PERSPECTIVES The therapeutic window of polyene lipid formulations might be expanded by varying their sterol composition. Polyene-loaded phytosomes might be considered as the prototypes for innovative lipid antibiotic formulations.
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Affiliation(s)
- Svetlana S Efimova
- Laboratory of Membrane and Ion Channel Modeling, Institute of Cytology of Russian Academy of Sciences, Tikhoretsky Ave. 4, 194064 St. Petersburg, Russia
| | - Olga S Ostroumova
- Laboratory of Membrane and Ion Channel Modeling, Institute of Cytology of Russian Academy of Sciences, Tikhoretsky Ave. 4, 194064 St. Petersburg, Russia
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Kravchenko TV, Paramonov AS, Kudzhaev AM, Efimova SS, Khorev AS, Kudryakova GK, Ivanov IA, Chistov AA, Baranova AA, Krasilnikov MS, Lapchinskaya OA, Tyurin AP, Ostroumova OS, Smirnov IV, Terekhov SS, Dontsova OA, Shenkarev ZO, Alferova VA, Korshun VA. Gausemycin Antibiotic Family Acts via Ca 2+-Dependent Membrane Targeting. J Nat Prod 2024. [PMID: 38362867 DOI: 10.1021/acs.jnatprod.3c00612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
We report the molecular mechanism of action of gausemycins and the isolation of new members of the family, gausemycins C (1c), D (1d), E (1e), and F (1f), the minor components of the mixture. To elucidate the mechanism of action of gausemycins, we investigated the antimicrobial activity of the most active compounds, gausemycins A and B, in the presence of Ca2+, other metal ions, and phosphate. Gausemycins require a significantly higher Ca2+ concentration for maximum activity than daptomycin but lower than that required for malacidine and cadasides. Species-specific antimicrobial activity was found upon testing against a wide panel of Gram-positive bacteria. Membranoactivity of gausemycins was demonstrated upon their interactions with model lipid bilayers and micelles. The pore-forming ability was found to be dramatically dependent on the Ca2+ concentration and the membrane lipid composition. An NMR study of gausemycin B in zwitterionic and anionic micelles suggested the putative structure of the gausemycin/membrane complex and revealed the binding of Ca2+ by the macrocyclic domain of the antibiotic.
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Affiliation(s)
- Tatyana V Kravchenko
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021 Moscow, Russia
| | - Alexander S Paramonov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
| | - Arsen M Kudzhaev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
| | - Svetlana S Efimova
- Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky Prospect 4, 194064 St. Petersburg, Russia
| | - Alexey S Khorev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
| | | | - Igor A Ivanov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
| | - Alexey A Chistov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
| | - Anna A Baranova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
| | - Maxim S Krasilnikov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
- Department of Chemistry, Lomonosov Moscow State University, 1-3 Leninskie Gory, 119992 Moscow, Russia
| | - Olda A Lapchinskaya
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021 Moscow, Russia
| | - Anton P Tyurin
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
| | - Olga S Ostroumova
- Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky Prospect 4, 194064 St. Petersburg, Russia
| | - Ivan V Smirnov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
| | - Stanislav S Terekhov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
| | - Olga A Dontsova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
- Department of Chemistry, Lomonosov Moscow State University, 1-3 Leninskie Gory, 119992 Moscow, Russia
| | - Zakhar O Shenkarev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
| | - Vera A Alferova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
| | - Vladimir A Korshun
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Miklukho-Maklaya 16/10, 117997 Moscow, Russia
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Ostroumova OS, Efimova SS. Lipid-Centric Approaches in Combating Infectious Diseases: Antibacterials, Antifungals and Antivirals with Lipid-Associated Mechanisms of Action. Antibiotics (Basel) 2023; 12:1716. [PMID: 38136750 PMCID: PMC10741038 DOI: 10.3390/antibiotics12121716] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Revised: 12/05/2023] [Accepted: 12/08/2023] [Indexed: 12/24/2023] Open
Abstract
One of the global challenges of the 21st century is the increase in mortality from infectious diseases against the backdrop of the spread of antibiotic-resistant pathogenic microorganisms. In this regard, it is worth targeting antibacterials towards the membranes of pathogens that are quite conservative and not amenable to elimination. This review is an attempt to critically analyze the possibilities of targeting antimicrobial agents towards enzymes involved in pathogen lipid biosynthesis or towards bacterial, fungal, and viral lipid membranes, to increase the permeability via pore formation and to modulate the membranes' properties in a manner that makes them incompatible with the pathogen's life cycle. This review discusses the advantages and disadvantages of each approach in the search for highly effective but nontoxic antimicrobial agents. Examples of compounds with a proven molecular mechanism of action are presented, and the types of the most promising pharmacophores for further research and the improvement of the characteristics of antibiotics are discussed. The strategies that pathogens use for survival in terms of modulating the lipid composition and physical properties of the membrane, achieving a balance between resistance to antibiotics and the ability to facilitate all necessary transport and signaling processes, are also considered.
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Affiliation(s)
- Olga S. Ostroumova
- Laboratory of Membrane and Ion Channel Modeling, Institute of Cytology, Russian Academy of Sciences, Tikhoretsky Ave. 4, St. Petersburg 194064, Russia;
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Efimova SS, Malykhina AI, Ostroumova OS. Triggering the Amphotericin B Pore-Forming Activity by Phytochemicals. Membranes (Basel) 2023; 13:670. [PMID: 37505036 PMCID: PMC10384262 DOI: 10.3390/membranes13070670] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 07/12/2023] [Accepted: 07/13/2023] [Indexed: 07/29/2023]
Abstract
The macrolide polyene antibiotic amphotericin B (AmB), remains a valuable drug to treat systemic mycoses due to its wide antifungal activity and low probability of developing resistance. The high toxicity of AmB, expressed in nephropathy and hemolysis, could be partially resolved by lowering therapeutic AmB concentration while maintaining efficacy. This work discusses the possibility of using plant polyphenols and alkaloids to enhance the pore-forming and consequently antifungal activity of AmB. We demonstrated that phloretin, phlorizin, naringenin, taxifolin, quercetin, biochanin A, genistein, resveratrol, and quinine led to an increase in the integral AmB-induced transmembrane current in the bilayers composed of palmitoyloleoylphosphocholine and ergosterol, while catechin, colchicine, and dihydrocapsaicin did not practically change the AmB activity. Cardamonin, 4'-hydroxychalcone, licochalcone A, butein, curcumin, and piperine inhibited AmB-induced transmembrane current. Absorbance spectroscopy revealed no changes in AmB membrane concentration with phloretin addition. A possible explanation of the potentiation is related to the phytochemical-produced changes in the elastic membrane properties and the decrease in the energy of formation of the lipid mouth of AmB pores, which is partially confirmed by differential scanning microcalorimetry. The possibility of AmB interaction with cholesterol in the mammalian cell membranes instead of ergosterol in fungal membranes, determines its high toxicity. The replacement of ergosterol with cholesterol in the membrane lipid composition led to a complete loss or a significant decrease in the potentiating effects of tested phytochemicals, indicating low potential toxicity of these compounds and high therapeutic potential of their combinations with the antibiotic. The discovered combinations of AmB with plant molecules that enhance its pore-forming ability in ergosterol-enriched membranes, seem to be promising for further drug development in terms of the toxicity decrease and efficacy improvement.
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Affiliation(s)
- Svetlana S Efimova
- Laboratory of Membrane and Ion Channel Modeling, Institute of Cytology of Russian Academy of Sciences, Tikhoretsky 4, 194064 Saint Petersburg, Russia
| | - Anna I Malykhina
- Laboratory of Membrane and Ion Channel Modeling, Institute of Cytology of Russian Academy of Sciences, Tikhoretsky 4, 194064 Saint Petersburg, Russia
| | - Olga S Ostroumova
- Laboratory of Membrane and Ion Channel Modeling, Institute of Cytology of Russian Academy of Sciences, Tikhoretsky 4, 194064 Saint Petersburg, Russia
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Efimova SS, Ostroumova OS. Modulation of the Dipole Potential of Model Lipid Membranes with Phytochemicals: Molecular Mechanisms, Structure-Activity Relationships, and Implications in Reconstituted Ion Channels. Membranes (Basel) 2023; 13:453. [PMID: 37103880 PMCID: PMC10141572 DOI: 10.3390/membranes13040453] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/17/2023] [Accepted: 04/18/2023] [Indexed: 06/19/2023]
Abstract
Phytochemicals, such as flavonoids, stilbenoids, alkaloids, terpenoids, and related compounds, have a wide range of useful pharmacological properties which cannot be ascribed to binding to a single peptide or protein target alone. Due to the relatively high lipophilicity of phytochemicals, the lipid membrane is thought to mediate their effects via changes in the properties of the lipid matrix, in particular, by modulating the transmembrane distribution of the electrical potential and, consequently, the formation and functioning of the ion channels reconstituted in the lipid bilayers. Therefore, biophysical studies on the interactions between plant metabolites and model lipid membranes are still of interest. This review represents an attempt to provide a critical analysis of a variety of studies on altering membranes and ion channels with phytochemicals via disturbing the potential drop at the membrane-aqueous solution interface. Critical structural motifs and functioning groups in the molecules of plant polyphenols (alkaloids and saponins are identified) and the possible mechanisms of dipole potential modulation with phytochemicals are discussed.
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Salimova EV, Mozgovoj OS, Efimova SS, Ostroumova OS, Parfenova LV. 3-Amino-Substituted Analogues of Fusidic Acid as Membrane-Active Antibacterial Compounds. Membranes (Basel) 2023; 13:309. [PMID: 36984696 PMCID: PMC10056636 DOI: 10.3390/membranes13030309] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 02/27/2023] [Accepted: 03/03/2023] [Indexed: 06/18/2023]
Abstract
Fusidic acid (FA) is an antibiotic with high activity against Staphylococcus aureus; it has been used in clinical practice since the 1960s. However, the narrow antimicrobial spectrum of FA limits its application in the treatment of bacterial infections. In this regard, this work aims both at the study of the antimicrobial effect of a number of FA amines and at the identification of their potential biological targets. In this way, FA analogues containing aliphatic and aromatic amino groups and biogenic polyamine, spermine and spermidine, moieties at the C-3 atom, were synthesized (20 examples). Pyrazinecarboxamide-substituted analogues exhibit a high antibacterial activity against S. aureus (MRSA) with MIC ≤ 0.25 μg/mL. Spermine and spermidine derivatives, along with activity against S. aureus, also inhibit the growth and reproduction of Gram-negative bacteria Escherichia coli, Acinetobacter baumannii, and Pseudomonas aeruginosa, and have a high fungicidal effect against Candida albicans and Cryptococcus neoformans. The study of the membrane activity demonstrated that the spermidine- and spermine-containing compounds are able to immerse into membranes and disorder the lipidsleading to a detergent effect. Moreover, spermine-based compounds are also able to form ion-permeable pores in the lipid bilayers mimicking the bacterial membranes. Using molecular docking, inhibition of the protein synthesis elongation factor EF-G was proposed, and polyamine substituents were shown to make the greatest contribution to the stability of the complexes of fusidic acid derivatives with biological targets. This suggests that the antibacterial effect of the obtained compounds may be associated with both membrane activity and inhibition of the elongation factor EF-G.
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Affiliation(s)
- Elena V. Salimova
- Institute of Petrochemistry and Catalysis, Ufa Federal Research Center, Russian Academy of Sciences, 141 Prospect Oktyabrya, 450075 Ufa, Russia
| | - Oleg S. Mozgovoj
- Institute of Petrochemistry and Catalysis, Ufa Federal Research Center, Russian Academy of Sciences, 141 Prospect Oktyabrya, 450075 Ufa, Russia
| | - Svetlana S. Efimova
- Institute of Cytology of Russian Academy of Sciences, 4 Tikhoretsky Prospect, 194064 Saint Petersburg, Russia
| | - Olga S. Ostroumova
- Institute of Cytology of Russian Academy of Sciences, 4 Tikhoretsky Prospect, 194064 Saint Petersburg, Russia
| | - Lyudmila V. Parfenova
- Institute of Petrochemistry and Catalysis, Ufa Federal Research Center, Russian Academy of Sciences, 141 Prospect Oktyabrya, 450075 Ufa, Russia
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Shekunov EV, Zlodeeva PD, Efimova SS, Muryleva AA, Zarubaev VV, Slita AV, Ostroumova OS. Cyclic lipopeptides as membrane fusion inhibitors against SARS-CoV-2: New tricks for old dogs. Antiviral Res 2023; 212:105575. [PMID: 36868316 PMCID: PMC9977712 DOI: 10.1016/j.antiviral.2023.105575] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Revised: 02/25/2023] [Accepted: 02/28/2023] [Indexed: 03/05/2023]
Abstract
With the resurgence of the coronavirus pandemic, the repositioning of FDA-approved drugs against coronovirus and finding alternative strategies for antiviral therapy are both important. We previously identified the viral lipid envelope as a potential target for the prevention and treatment of SARS-CoV-2 infection with plant alkaloids (Shekunov et al., 2021). Here, we investigated the effects of eleven cyclic lipopeptides (CLPs), including well-known antifungal and antibacterial compounds, on the liposome fusion triggered by calcium, polyethylene glycol 8000, and a fragment of SARS-CoV-2 fusion peptide (816-827) by calcein release assays. Differential scanning microcalorimetry of the gel-to-liquid-crystalline and lamellar-to-inverted hexagonal phase transitions and confocal fluorescence microscopy demonstrated the relation of the fusion inhibitory effects of CLPs to alterations in lipid packing, membrane curvature stress and domain organization. The antiviral effects of CLPs were evaluated in an in vitro Vero-based cell model, and aculeacin A, anidulafugin, iturin A, and mycosubtilin attenuated the cytopathogenicity of SARS-CoV-2 without specific toxicity.
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Affiliation(s)
- Egor V Shekunov
- Institute of Cytology of Russian Academy of Sciences, Tikhoretsky 4, 194064, Saint Petersburg, Russia
| | - Polina D Zlodeeva
- Institute of Cytology of Russian Academy of Sciences, Tikhoretsky 4, 194064, Saint Petersburg, Russia
| | - Svetlana S Efimova
- Institute of Cytology of Russian Academy of Sciences, Tikhoretsky 4, 194064, Saint Petersburg, Russia
| | - Anna A Muryleva
- Institute of Cytology of Russian Academy of Sciences, Tikhoretsky 4, 194064, Saint Petersburg, Russia; Saint-Petersburg Pasteur Institute of Epidemiology and Microbiology, Mira 14, 197101, Saint Petersburg, Russia
| | - Vladimir V Zarubaev
- Saint-Petersburg Pasteur Institute of Epidemiology and Microbiology, Mira 14, 197101, Saint Petersburg, Russia
| | - Alexander V Slita
- Saint-Petersburg Pasteur Institute of Epidemiology and Microbiology, Mira 14, 197101, Saint Petersburg, Russia
| | - Olga S Ostroumova
- Institute of Cytology of Russian Academy of Sciences, Tikhoretsky 4, 194064, Saint Petersburg, Russia.
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Tevyashova AN, Efimova SS, Alexandrov AI, Ghazy ESMO, Bychkova EN, Solovieva SE, Zatonsky GB, Grammatikova NE, Dezhenkova LG, Pereverzeva ER, Isakova EB, Ostroumova OS, Omelchuk OA, Muravieva VV, Krotova MM, Priputnevich TV, Shchekotikhin AE. Semisynthetic Amides of Polyene Antibiotic Natamycin. ACS Infect Dis 2023; 9:42-55. [PMID: 36563312 DOI: 10.1021/acsinfecdis.2c00237] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Natamycin is a macrolide polyene antibiotic, characterized by a potent broad spectrum antifungal activity and low toxicity. However, it is not used for the treatment of systemic mycoses due to its low bioavailability and low solubility in aqueous solutions. In order to create new semisynthetic antifungal agents for treatment of mycoses, a series of water-soluble amides of natamycin were synthesized. Antifungal activities of natamycin derivatives were investigated against Candida spp., including a panel of Candida auris clinical isolates and filamentous fungi. Toxicity for mammalian cells was assayed by monitoring antiproliferative activity against human postnatal fibroblasts (HPF) and human embryonic kidney cells (HEK293). By comparing leakage of contents from ergosterol versus cholesterol containing vesicles, a ratio that characterizes the efficacy and safety of natamycin and its derivatives was determined (EI, efficiency index). Ability of all tested semisynthetic natamycines to prevent proliferation of the yeast Candida spp. cells was comparable or even slightly higher to those of parent antibiotic. Interestingly, amide 8 was more potent than natamycin (1) against all tested C. auris strains (MIC values 2 μg/mL vs 8 μg/mL, respectively). Among 7 derivatives, amide 10 with long lipophilic side chains showed the highest EI and strong antifungal activity in vitro but was more toxic against HPF. In vivo experiments with amide 8 showed in vivo efficacy on a mouse candidemia model with a larger LD50/ED50 ratio in comparison to amphotericin B.
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Affiliation(s)
- Anna N Tevyashova
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow119021, Russia
| | - Svetlana S Efimova
- Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky Avenue, St. Petersburg194064, Russia
| | - Alexander I Alexandrov
- Federal Research Center "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Bach Institute of Biochemistry, 33 Leninsky Avenue, Bld. 2, Moscow119071, Russia
| | - Eslam S M O Ghazy
- Federal Research Center "Fundamentals of Biotechnology" of the Russian Academy of Sciences, Bach Institute of Biochemistry, 33 Leninsky Avenue, Bld. 2, Moscow119071, Russia.,Institute of Biochemical Technology and Nanotechnology, Peoples' Friendship University of Russia (RUDN), 6 Miklukho-Maklaya Street, Moscow117198, Russia.,Department of Microbiology, Faculty of Pharmacy, Tanta University, Tanta31111, Egypt
| | - Elena N Bychkova
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow119021, Russia
| | | | - Georgy B Zatonsky
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow119021, Russia
| | | | - Lyubov G Dezhenkova
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow119021, Russia
| | | | - Elena B Isakova
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow119021, Russia
| | - Olga S Ostroumova
- Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky Avenue, St. Petersburg194064, Russia
| | - Olga A Omelchuk
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow119021, Russia
| | - Vera V Muravieva
- National Medical Research Center for Obstetrics, Gynecology and Perinatology Named After Academician V.I. Kulakov of Ministry of Healthcare of Russian Federation, 4 Oparin Street, Moscow117997, Russia
| | - Marina M Krotova
- National Medical Research Center for Obstetrics, Gynecology and Perinatology Named After Academician V.I. Kulakov of Ministry of Healthcare of Russian Federation, 4 Oparin Street, Moscow117997, Russia
| | - Tatiana V Priputnevich
- National Medical Research Center for Obstetrics, Gynecology and Perinatology Named After Academician V.I. Kulakov of Ministry of Healthcare of Russian Federation, 4 Oparin Street, Moscow117997, Russia
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Chernyshova DN, Tyulin AA, Ostroumova OS, Efimova SS. Discovery of the Potentiator of the Pore-Forming Ability of Lantibiotic Nisin: Perspectives for Anticancer Therapy. Membranes (Basel) 2022; 12:membranes12111166. [PMID: 36422158 PMCID: PMC9694817 DOI: 10.3390/membranes12111166] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Revised: 11/15/2022] [Accepted: 11/17/2022] [Indexed: 05/12/2023]
Abstract
This study was focused on the action of lantibiotic nisin on the phospholipid membranes. Nisin did not produce ion-permeable pores in the membranes composed of DOPC or DOPE. The introduction of DOPS into bilayer lipid composition led to a decrease in the threshold detergent concentration of nisin. An addition of nisin to DOPG- and TOCL-enriched bilayers caused the formation of well-defined ion pores of various conductances. The transmembrane macroscopic current increased with the second power of the lantibiotic aqueous concentration, suggesting that the dimer of nisin was at least involved in the formation of conductive subunit. The pore-forming ability of lantibiotic decreased in the series: DOPC/TOCL ≈ DOPE/TOCL >> DOPC/DOPG ≥ DOPE/DOPG. The preferential interaction of nisin to cardiolipin-enriched bilayers might explain its antitumor activity by pore-formation in mitochondrial membranes. Small natural molecules, phloretin and capsaicin, were found to potentiate the membrane activity of nisin in the TOCL-containing membranes. The effect was referred to as changes in the membrane boundary potential at the adsorption of small molecules. We concluded that the compounds diminishing the membrane boundary potential should be considered as the potentiator of the nisin pore-forming ability that can be used to develop innovative formulations for anticancer therapy.
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Zakharova AA, Efimova SS, Ostroumova OS. Phosphodiesterase Type 5 Inhibitors Greatly Affect Physicochemical Properties of Model Lipid Membranes. Membranes (Basel) 2021; 11:membranes11110893. [PMID: 34832122 PMCID: PMC8622654 DOI: 10.3390/membranes11110893] [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] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2021] [Revised: 11/17/2021] [Accepted: 11/17/2021] [Indexed: 01/04/2023]
Abstract
Although phosphodiesterase type 5 inhibitors are widely used and well-studied drugs, the potential benefits of their application in the treatment of various diseases and new drug delivery systems, including liposome forms, are still being discussed. In this regard, the role of the lipid matrix of cell membranes in the pharmacological action of the inhibitors is of special interest. It was shown that sildenafil, vardenafil, and tadalafil caused a significant decrease in the boundary potential of model membranes composed of palmitoyloleoylphosphatidylcholine or its mixture with cholesterol, by 70–80 mV. The reduction in the membrane dipole potential induced by inhibitors led to a 20–25% increase in the conductance of cation-selective pores formed by the antimicrobial peptide gramicidin A. The addition of sildenafil or vardenafil also led to a significant decrease in the temperature of the main phase transition of dipalmytoylphosphatidylcholine, by about 1.5 °C, while tadalafil did not change the melting temperature. Sildenafil, vardenafil, and tadalafil enhanced the pore-forming activity of the antifungal polyene antibiotic nystatin by 11, 13, and 2 times, respectively. This fact might indicate the induction of membrane curvature stress by the inhibitors. The data obtained might be of special interest for the development of lipid-mediated forms of drugs.
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Tyurin AP, Alferova VA, Paramonov AS, Shuvalov MV, Kudryakova GK, Rogozhin EA, Zherebker AY, Brylev VA, Chistov AA, Baranova AA, Biryukov MV, Ivanov IA, Prokhorenko IA, Grammatikova NE, Kravchenko TV, Isakova EB, Mirchink EP, Gladkikh EG, Svirshchevskaya EV, Mardanov AV, Beletsky AV, Kocharovskaya MV, Kulyaeva VV, Shashkov AS, Tsvetkov DE, Nifantiev NE, Apt AS, Majorov KB, Efimova SS, Ravin NV, Nikolaev EN, Ostroumova OS, Katrukha GS, Lapchinskaya OA, Dontsova OA, Terekhov SS, Osterman IA, Shenkarev ZO, Korshun VA. Inside Cover: Gausemycins A,B: Cyclic Lipoglycopeptides from
Streptomyces
sp. (Angew. Chem. Int. Ed. 34/2021). Angew Chem Int Ed Engl 2021. [DOI: 10.1002/anie.202107693] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Tyurin AP, Alferova VA, Paramonov AS, Shuvalov MV, Kudryakova GK, Rogozhin EA, Zherebker AY, Brylev VA, Chistov AA, Baranova AA, Biryukov MV, Ivanov IA, Prokhorenko IA, Grammatikova NE, Kravchenko TV, Isakova EB, Mirchink EP, Gladkikh EG, Svirshchevskaya EV, Mardanov AV, Beletsky AV, Kocharovskaya MV, Kulyaeva VV, Shashkov AS, Tsvetkov DE, Nifantiev NE, Apt AS, Majorov KB, Efimova SS, Ravin NV, Nikolaev EN, Ostroumova OS, Katrukha GS, Lapchinskaya OA, Dontsova OA, Terekhov SS, Osterman IA, Shenkarev ZO, Korshun VA. Gausemycins A,B: Cyclic Lipoglycopeptides from
Streptomyces
sp.**. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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13
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Tyurin AP, Alferova VA, Paramonov AS, Shuvalov MV, Kudryakova GK, Rogozhin EA, Zherebker AY, Brylev VA, Chistov AA, Baranova AA, Biryukov MV, Ivanov IA, Prokhorenko IA, Grammatikova NE, Kravchenko TV, Isakova EB, Mirchink EP, Gladkikh EG, Svirshchevskaya EV, Mardanov AV, Beletsky AV, Kocharovskaya MV, Kulyaeva VV, Shashkov AS, Tsvetkov DE, Nifantiev NE, Apt AS, Majorov KB, Efimova SS, Ravin NV, Nikolaev EN, Ostroumova OS, Katrukha GS, Lapchinskaya OA, Dontsova OA, Terekhov SS, Osterman IA, Shenkarev ZO, Korshun VA. Gausemycins A,B: Cyclic Lipoglycopeptides from Streptomyces sp.*. Angew Chem Int Ed Engl 2021; 60:18694-18703. [PMID: 34009717 DOI: 10.1002/anie.202104528] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 04/20/2021] [Indexed: 11/10/2022]
Abstract
We report a novel family of natural lipoglycopeptides produced by Streptomyces sp. INA-Ac-5812. Two major components of the mixture, named gausemycins A and B, were isolated, and their structures were elucidated. The compounds are cyclic peptides with a unique peptide core and several remarkable structural features, including unusual positions of d-amino acids, lack of the Ca2+ -binding Asp-X-Asp-Gly (DXDG) motif, tyrosine glycosylation with arabinose, presence of 2-amino-4-hydroxy-4-phenylbutyric acid (Ahpb) and chlorinated kynurenine (ClKyn), and N-acylation of the ornithine side chain. Gausemycins have pronounced activity against Gram-positive bacteria. Mechanistic studies highlight significant differences compared to known glyco- and lipopeptides. Gausemycins exhibit only slight Ca2+ -dependence of activity and induce no pore formation at low concentrations. Moreover, there is no detectable accumulation of cell wall biosynthesis precursors under treatment with gausemycins.
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Affiliation(s)
- Anton P Tyurin
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia
| | - Vera A Alferova
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia.,Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia
| | - Alexander S Paramonov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia
| | - Maxim V Shuvalov
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia.,Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, 119992, Moscow, Russia
| | | | - Eugene A Rogozhin
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia.,Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia
| | - Alexander Y Zherebker
- Skolkovo Institute of Science and Technology, Nobel Street 3, Skolkovo, 143026, Moscow Region, Russia
| | - Vladimir A Brylev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia
| | - Alexey A Chistov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia
| | - Anna A Baranova
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia.,Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia
| | - Mikhail V Biryukov
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia.,Department of Biology, Lomonosov Moscow State University, Leninskie Gory 1-3, 119992, Moscow, Russia
| | - Igor A Ivanov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia
| | - Igor A Prokhorenko
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia.,Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia
| | | | - Tatyana V Kravchenko
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia.,Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia
| | - Elena B Isakova
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia
| | - Elena P Mirchink
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia
| | - Elena G Gladkikh
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia
| | - Elena V Svirshchevskaya
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia
| | - Andrey V Mardanov
- Institute of Bioengineering, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Prospect 33-2, 119071, Moscow, Russia
| | - Aleksey V Beletsky
- Institute of Bioengineering, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Prospect 33-2, 119071, Moscow, Russia
| | - Milita V Kocharovskaya
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia.,Moscow Institute of Physics and Technology, Institutsky Lane 9, Dolgoprydny, 141700, Moscow region, Russia
| | - Valeriya V Kulyaeva
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia
| | - Alexander S Shashkov
- Zelinsky Institute of Organic Chemistry RAS, Leninsky Prospect 47, 119991, Moscow, Russia
| | - Dmitry E Tsvetkov
- Zelinsky Institute of Organic Chemistry RAS, Leninsky Prospect 47, 119991, Moscow, Russia
| | - Nikolay E Nifantiev
- Zelinsky Institute of Organic Chemistry RAS, Leninsky Prospect 47, 119991, Moscow, Russia
| | - Alexander S Apt
- Central Tuberculosis Research Institute, Yauzskaya Alley 2, 107564, Moscow, Russia
| | - Konstantin B Majorov
- Central Tuberculosis Research Institute, Yauzskaya Alley 2, 107564, Moscow, Russia
| | - Svetlana S Efimova
- Institute of Cytology RAS, Tikhoretsky Prospect 4, 194064, St. Petersburg, Russia
| | - Nikolai V Ravin
- Institute of Bioengineering, Research Center of Biotechnology of the Russian Academy of Sciences, Leninsky Prospect 33-2, 119071, Moscow, Russia
| | - Evgeny N Nikolaev
- Skolkovo Institute of Science and Technology, Nobel Street 3, Skolkovo, 143026, Moscow Region, Russia
| | - Olga S Ostroumova
- Institute of Cytology RAS, Tikhoretsky Prospect 4, 194064, St. Petersburg, Russia
| | - Genrikh S Katrukha
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia
| | - Olda A Lapchinskaya
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia
| | - Olga A Dontsova
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia.,Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, 119992, Moscow, Russia.,Skolkovo Institute of Science and Technology, Nobel Street 3, Skolkovo, 143026, Moscow Region, Russia
| | - Stanislav S Terekhov
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia.,Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, 119992, Moscow, Russia
| | - Ilya A Osterman
- Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1-3, 119992, Moscow, Russia.,Skolkovo Institute of Science and Technology, Nobel Street 3, Skolkovo, 143026, Moscow Region, Russia
| | - Zakhar O Shenkarev
- Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia.,Moscow Institute of Physics and Technology, Institutsky Lane 9, Dolgoprydny, 141700, Moscow region, Russia
| | - Vladimir A Korshun
- Gause Institute of New Antibiotics, B. Pirogovskaya 11, 119021, Moscow, Russia.,Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry RAS, Miklukho-Maklaya 16/10, 117997, Moscow, Russia
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14
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Tyurin AP, Alferova VA, Paramonov AS, Shuvalov MV, Kudryakova GK, Rogozhin EA, Zherebker AY, Brylev VA, Chistov AA, Baranova AA, Biryukov MV, Ivanov IA, Prokhorenko IA, Grammatikova NE, Kravchenko TV, Isakova EB, Mirchink EP, Gladkikh EG, Svirshchevskaya EV, Mardanov AV, Beletsky AV, Kocharovskaya MV, Kulyaeva VV, Shashkov AS, Tsvetkov DE, Nifantiev NE, Apt AS, Majorov KB, Efimova SS, Ravin NV, Nikolaev EN, Ostroumova OS, Katrukha GS, Lapchinskaya OA, Dontsova OA, Terekhov SS, Osterman IA, Shenkarev ZO, Korshun VA. Innentitelbild: Gausemycins A,B: Cyclic Lipoglycopeptides from
Streptomyces
sp. (Angew. Chem. 34/2021). Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202107693] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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15
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Efimova SS, Zakharova AA, Ostroumova OS. The Mechanisms of Lipid-Mediated Regulation of the Activity of Antimicrobial Peptides of Different Secondary Structure. Biophys J 2021. [DOI: 10.1016/j.bpj.2020.11.507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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16
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Efimova SS, Ostroumova OS. The Saponins Affect the Electrical Properties of the Lipid Bilayers. Biophys J 2021. [DOI: 10.1016/j.bpj.2020.11.2053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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17
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Maksimov EG, Zamaraev AV, Parshina EY, Slonimskiy YB, Slastnikova TA, Abdrakhmanov AA, Babaev PA, Efimova SS, Ostroumova OS, Stepanov AV, Slutskaya EA, Ryabova AV, Friedrich T, Sluchanko NN. Soluble Cyanobacterial Carotenoprotein as a Robust Antioxidant Nanocarrier and Delivery Module. Antioxidants (Basel) 2020; 9:antiox9090869. [PMID: 32942578 PMCID: PMC7555398 DOI: 10.3390/antiox9090869] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [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: 08/18/2020] [Revised: 09/09/2020] [Accepted: 09/10/2020] [Indexed: 01/04/2023] Open
Abstract
To counteract oxidative stress, antioxidants including carotenoids are highly promising, yet their exploitation is drastically limited by the poor bioavailability and fast photodestruction, whereas current delivery systems are far from being efficient. Here we demonstrate that the recently discovered nanometer-sized water-soluble carotenoprotein from Anabaena sp. PCC 7120 (termed AnaCTDH) transiently interacts with liposomes to efficiently extract carotenoids via carotenoid-mediated homodimerization, yielding violet–purple protein samples. We characterize the spectroscopic properties of the obtained pigment–protein complexes and the thermodynamics of liposome–protein carotenoid transfer and demonstrate the delivery of carotenoid echinenone from AnaCTDH into liposomes with an efficiency of up to 70 ± 3%. Most importantly, we show efficient carotenoid delivery to membranes of mammalian cells, which provides protection from reactive oxygen species (ROS). Incubation of neuroblastoma cell line Tet21N in the presence of 1 μM AnaCTDH binding echinenone decreased antimycin A ROS production by 25% (p < 0.05). The described carotenoprotein may be considered as part of modular systems for the targeted antioxidant delivery.
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Affiliation(s)
- Eugene G. Maksimov
- Department of Biophysics, Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; (E.Y.P.); (P.A.B.); (N.N.S.)
- A.N. Bach Institute of Biochemistry, Federal Research Center of Biotechnology of the Russian Academy of Sciences, 119071 Moscow, Russia;
- Correspondence: ; Tel.: +7-926-735-04-37
| | - Alexey V. Zamaraev
- Faculty of Basic Medicine, MV Lomonosov Moscow State University, 117192 Moscow, Russia; (A.V.Z.); (A.A.A.)
- Center for Strategic Planning and Management of Medical and Biological Health Risks, 119121 Moscow, Russia
| | - Evgenia Yu. Parshina
- Department of Biophysics, Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; (E.Y.P.); (P.A.B.); (N.N.S.)
| | - Yury B. Slonimskiy
- A.N. Bach Institute of Biochemistry, Federal Research Center of Biotechnology of the Russian Academy of Sciences, 119071 Moscow, Russia;
| | | | - Alibek A. Abdrakhmanov
- Faculty of Basic Medicine, MV Lomonosov Moscow State University, 117192 Moscow, Russia; (A.V.Z.); (A.A.A.)
| | - Pavel A. Babaev
- Department of Biophysics, Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; (E.Y.P.); (P.A.B.); (N.N.S.)
| | - Svetlana S. Efimova
- Institute of Cytology of the Russian Academy of Sciences, 194064 St. Petersburg, Russia; (S.S.E.); (O.S.O.)
| | - Olga S. Ostroumova
- Institute of Cytology of the Russian Academy of Sciences, 194064 St. Petersburg, Russia; (S.S.E.); (O.S.O.)
| | - Alexey V. Stepanov
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997 Moscow, Russia; (A.V.S.); (E.A.S.)
| | - Ekaterina A. Slutskaya
- M.M. Shemyakin and Yu.A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, 117997 Moscow, Russia; (A.V.S.); (E.A.S.)
| | - Anastasia V. Ryabova
- A.M. Prokhorov General Physics Institute, Russian Academy of Sciences, 119991 Moscow, Russia;
| | - Thomas Friedrich
- Institute of Chemistry PC 14, Department of Bioenergetics, Technische Universität Berlin, 10623 Berlin, Germany;
| | - Nikolai N. Sluchanko
- Department of Biophysics, Faculty of Biology, Lomonosov Moscow State University, 119991 Moscow, Russia; (E.Y.P.); (P.A.B.); (N.N.S.)
- A.N. Bach Institute of Biochemistry, Federal Research Center of Biotechnology of the Russian Academy of Sciences, 119071 Moscow, Russia;
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18
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Tevyashova AN, Bychkova EN, Solovieva SE, Zatonsky GV, Grammatikova NE, Isakova EB, Mirchink EP, Treshchalin ID, Pereverzeva ER, Bykov EE, Efimova SS, Ostroumova OS, Shchekotikhin AE. Discovery of Amphamide, a Drug Candidate for the Second Generation of Polyene Antibiotics. ACS Infect Dis 2020; 6:2029-2044. [PMID: 32598131 DOI: 10.1021/acsinfecdis.0c00068] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Amphotericin B (AmB, 1) is the drug of choice for treating the most serious systemic fungal or protozoan infections. Nevertheless, its application is limited by low solubility in aqueous media and serious side effects such as infusion-related reactions, hemolytic toxicity, and nephrotoxicity. Owing to these limitations, it is essential to search for the polyene derivatives with better chemotherapeutic properties. With the objective of obtaining AmB derivatives with lower self-aggregation and improved solubility, we synthesized a series of amides of AmB bearing an additional basic group in the introduced residue. The screening of antifungal activity in vitro revealed that N-(2-aminoethyl)amide of AmB (amphamide, 6) had superior antifungal activity compared to that of the paternal AmB. Preclinical studies in mice confirmed that compound 6 had a much lower acute toxicity and higher antifungal efficacy in the model of mice candidosis sepsis compared with that of AmB (1). Thus, the discovered amphamide is a promising drug candidate for the second generation of polyene antibiotics and is also prospective for in-depth preclinical and clinical evaluation.
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Affiliation(s)
- Anna N. Tevyashova
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow, 199021, Russia
- D. Mendeleev University of Chemical Technology of Russia, 9 Miusskaya sq., Moscow, 125047, Russia
| | - Elena N. Bychkova
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow, 199021, Russia
| | | | - George V. Zatonsky
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow, 199021, Russia
| | | | - Elena B. Isakova
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow, 199021, Russia
| | - Elena P. Mirchink
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow, 199021, Russia
| | - Ivan D. Treshchalin
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow, 199021, Russia
| | | | - Evgeny E. Bykov
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow, 199021, Russia
| | - Svetlana S. Efimova
- Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky ave., St. Petersburg, 194064, Russia
| | - Olga S. Ostroumova
- Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky ave., St. Petersburg, 194064, Russia
| | - Andrey E. Shchekotikhin
- Gause Institute of New Antibiotics, 11 B. Pirogovskaya, Moscow, 199021, Russia
- D. Mendeleev University of Chemical Technology of Russia, 9 Miusskaya sq., Moscow, 125047, Russia
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19
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Efimova SS, Khaleneva DA, Litasova EV, Piotrovskiy LB, Ostroumova OS. The mechanisms of action of water-soluble aminohexanoic and malonic adducts of fullerene C 60 with hexamethonium on model lipid membranes. Biochim Biophys Acta Biomembr 2020; 1862:183433. [PMID: 32763244 DOI: 10.1016/j.bbamem.2020.183433] [Citation(s) in RCA: 4] [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] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 07/10/2020] [Accepted: 07/22/2020] [Indexed: 10/23/2022]
Abstract
In an attempt to understand the possibility of applications of the fullerene-based systems for transporting various polar compounds like hexamethonium through the blood-brain barrier, we studied the influence of a series of derivatives of fullerene C60 in the form of salts with hexamethonium bis-anion, namely the adducts of fullerenols with 6-aminohexanoic acid (IEM-2197), and two bis-adduct malonic acid derivatives of fullerene with addents bound in two hemispheres (IEM-2143) and in equatorial positions (IEM-2144), on model membranes. We showed that IEM-2197 induced the disintegration of the bilayers composed of DOPC at the concentrations more than 2 mg/ml. IEM-2144 and IEM-2143-induced ion-permeable pores at concentrations of 0.3 and 0.02 mg/ml, respectively; herewith, IEM-2143 was characterized by the greater efficiency than IEM-2144. IEM-2197 did not significantly affect the phase behavior of DPPC, while the melting temperature significantly decreased with addition of IEM-2144 and IEM-2143. The increase in the half-width of the main transition peaks by more than 2.0 °C in the presence of IEM-2144 and IEM-2143 was observed, along with the pronounced peak deconvolution. We proposed that the immersion of IEM-2144 and IEM-2143 into the polar region of the DOPC or DPPC bilayers led to an increase in the relative mobility of tails and formation of ion-permeable defects. IEM-2197 demonstrated the more pronounced effects on the melting and ion permeability of PG- and PS-containing bilayers compared to PC-enriched membranes. These results indicated that IEM-2197 preferentially interacts with the negatively charged lipids compared to neutral species.
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Affiliation(s)
- S S Efimova
- Institute of Cytology, Russian of the Academy of Science, Saint Petersburg, Russia.
| | - D A Khaleneva
- Institute of Cytology, Russian of the Academy of Science, Saint Petersburg, Russia
| | - E V Litasova
- Institute of Experimental Medicine, Saint Petersburg, Russia
| | - L B Piotrovskiy
- Institute of Experimental Medicine, Saint Petersburg, Russia.
| | - O S Ostroumova
- Institute of Cytology, Russian of the Academy of Science, Saint Petersburg, Russia
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20
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Zakharova AA, Efimova SS, Yuskovets VN, Yakovlev IP, Sarkisyan ZM, Ostroumova OS. 1,3-Thiazine, 1,2,3,4-Dithiadiazole, and Thiohydrazide Derivatives Affect Lipid Bilayer Properties and Ion-Permeable Pores Induced by Antifungals. Front Cell Dev Biol 2020; 8:535. [PMID: 32695784 PMCID: PMC7339130 DOI: 10.3389/fcell.2020.00535] [Citation(s) in RCA: 4] [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: 04/14/2020] [Accepted: 06/08/2020] [Indexed: 12/02/2022] Open
Abstract
Over the past decade, thiazines, thiadiazoles, and thiohydrazides have attracted increasing attention due to their sedative, antimicrobial, antiviral, antifungal, and antitumor activities. The clinical efficacy of such drugs, as well as the possibility of developing resistance to antimicrobials, will depend on addressing a number of fundamental problems, including the role of membrane lipids during their interaction with plasma membranes. The effects of the eight 1,3- thiazine-, 1,2,3,4- dithiadiazole-, and thiohydrazide-related compounds on the physical properties of model lipid membranes and the effects on reconstituted ion channels induced by the polyene macrolide antimycotic nystatin and antifungal cyclic lipopeptides syringomycin E and fengycin were observed. We found that among the tested agents, the fluorine-containing compound N′-(3,5-difluorophenyl)-benzenecarbothiohydrazide (C6) was the most effective at increasing the electric barrier for anion permeation into the hydrophobic region of the membrane and reducing the conductance of anion-permeable syringomycin pores. A decrease in the membrane boundary potential with C6 adsorption also facilitated the immersion of positively charged syringomycin molecules into the lipid bilayer and increases the pore-forming ability of the lipopeptide. Using differential scanning microcalorimetry, we showed that C6 led to disordering of membrane lipids, possibly by potentiating positive curvature stress. Therefore, we used C6 as an agonist of antifungals forming the pores that are sensitive to membrane curvature stress and lipid packing, i.e., nystatin and fengycin. The dramatic increase in transmembrane current induced by syringomycin E, nystatin, and fengycin upon C6 treatment suggests its potential in combination therapy for treating invasive fungal infections.
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Affiliation(s)
- Anastasiia A Zakharova
- Laboratory of Membrane and Ion Channel Modeling, Institute of Cytology, Russian Academy of Sciences, Saint Petersburg, Russia
| | - Svetlana S Efimova
- Laboratory of Membrane and Ion Channel Modeling, Institute of Cytology, Russian Academy of Sciences, Saint Petersburg, Russia
| | - Valeriy N Yuskovets
- Department of Organic Chemistry, Saint-Petersburg State Chemical Pharmaceutical University, Saint Petersburg, Russia
| | - Igor P Yakovlev
- Department of Organic Chemistry, Saint-Petersburg State Chemical Pharmaceutical University, Saint Petersburg, Russia
| | - Zara M Sarkisyan
- Department of General and Medical Chemistry, Saint-Petersburg State Pediatric Medical University, Saint Petersburg, Russia
| | - Olga S Ostroumova
- Laboratory of Membrane and Ion Channel Modeling, Institute of Cytology, Russian Academy of Sciences, Saint Petersburg, Russia
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21
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Efimova SS, Zakharova AA, Ostroumova OS. Alkaloids Modulate the Functioning of Ion Channels Produced by Antimicrobial Agents via an Influence on the Lipid Host. Front Cell Dev Biol 2020; 8:537. [PMID: 32695785 PMCID: PMC7339123 DOI: 10.3389/fcell.2020.00537] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [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: 03/20/2020] [Accepted: 06/08/2020] [Indexed: 12/22/2022] Open
Abstract
It is widely recognized that an alteration in membrane physical properties induced by the adsorption of various drugs and biologically active compounds might greatly affect the functioning of peptides and proteins embedded in the membrane, in particular various ion channels. This study aimed to obtain deep insight into the diversity of the molecular mechanisms of membrane action of one of the most numerous and extremely important class of phytochemicals, the alkaloids. Protoalkaloids (derivatives of β-phenylethylamine, benzylamines, and colchicines), heterocyclic alkaloids (derivatives of purine, quinolysidine, piperidine, pyridine, quinoline, and isoquinoline), and steroid alkaloids were tested. We evaluated the effects of 22 compounds on lipid packing by investigating the thermotropic behavior of membrane lipids and the leakage of a fluorescent marker from unilamellar lipid vesicles. The alteration in the transmembrane distribution of the electrical potential was estimated by measuring the alkaloid induced changes in the boundary potential of planar lipid bilayers. We found that benzylamines, the chili pepper active components, capsaicin and dihydrocapsaicin, strongly affect not only the elastic properties of the lipid host, but also its electrostatics by dramatic decrease in membrane dipole potential. We concluded that the increase in the conductance and lifetime of gramicidin A channels induced by benzylamines was related to alteration in membrane dipole potential not to decrease in membrane stiffness. A sharp decrease in the lifetime of single ion pores induced by the antifungal lipopeptide syringomycin E, after addition of benzylamines and black pepper alkaloid piperine, was also mainly due to the reduction in dipole potential. At the same time, we showed that the disordering of membrane lipids in the presence of benzylamines and piperine plays a decisive role in the regulation of the conductance induced by the antifungal polyene macrolide antibiotic nystatin, while the inhibition of steady-state transmembrane current produced by the antimicrobial peptide cecropin A was attributed to both the dipole potential drop and membrane lipid disordering in the presence of pepper alkaloids. These data might lead to a better understanding of the biological activity of alkaloids, especially their action on voltage-gated and mechanosensitive ion channels in cell membranes.
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Affiliation(s)
- Svetlana S Efimova
- Laboratory of Membrane and Ion Channel Modeling, Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russia
| | - Anastasiia A Zakharova
- Laboratory of Membrane and Ion Channel Modeling, Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russia
| | - Olga S Ostroumova
- Laboratory of Membrane and Ion Channel Modeling, Institute of Cytology, Russian Academy of Sciences, St. Petersburg, Russia
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Zakharova AA, Efimova SS, Ostroumova OS. Role of Lipid Environment in the Pore-Forming Activity of Cecropin A. Biophys J 2020. [DOI: 10.1016/j.bpj.2019.11.3039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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Efimova SS, Ostroumova OS. The Effect of Phloretin on the Thermotropic Behavior of Membrane Forming Lipids. Biophys J 2019. [DOI: 10.1016/j.bpj.2018.11.516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Zakharova AA, Efimova SS, Schagina LV, Malev VV, Ostroumova OS. Blocking ion channels induced by antifungal lipopeptide syringomycin E with amide-linked local anesthetics. Sci Rep 2018; 8:11543. [PMID: 30069037 PMCID: PMC6070474 DOI: 10.1038/s41598-018-30077-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2018] [Accepted: 07/24/2018] [Indexed: 11/22/2022] Open
Abstract
The effects of the amide-linked (lidocaine (LDC), mepivacaine (MPV), prilocaine (PLC)) and ester-bound local anesthetics (benzocaine (BZC), procaine (PRC), and tetracaine (TTC)) on the pore-forming activity of the antifungal lipopeptide syringomycin E (SRE) in lipid bilayers were studied. Independently on electrolyte concentration in the membrane bathing solution the observed changes in conductance of SRE channels agreed with the altered membrane dipole potential under the action of ester-bound local anesthetics. Effects of aminoamides in diluted and concentrated solutions were completely different. At 0.1 M KCl (pH 7.4) the effects of amide-linked anesthetics were in accordance with changes in the membrane surface potential, while at 2 M KCl aminoamides blocked ion passage through the SRE channels, leading to sharp reductions in pore conductance at negative voltages and 100-fold decreases in the channel lifetimes. The effects were not practically influenced by the membrane lipid composition. The interaction cooperativity implied the existence of specific binding sites for amide-bound anesthetics in SRE channels.
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Affiliation(s)
- Anastasiia A Zakharova
- Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky prospect, St. Petersburg, 194064, Russia
| | - Svetlana S Efimova
- Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky prospect, St. Petersburg, 194064, Russia
| | - Ludmila V Schagina
- Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky prospect, St. Petersburg, 194064, Russia
| | - Valery V Malev
- Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky prospect, St. Petersburg, 194064, Russia.,Saint Petersburg State University, Institute of Chemistry, 26 Universitetskii prospect, St. Petersburg, Petergof, 198504, Russia
| | - Olga S Ostroumova
- Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky prospect, St. Petersburg, 194064, Russia.
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Efimova SS, Zakharova AA, Medvedev RY, Ostroumova OS. Ion Channels Induced by Antimicrobial Agents in Model Lipid Membranes are Modulated by Plant Polyphenols Through Surrounding Lipid Media. J Membr Biol 2018; 251:551-562. [PMID: 29549386 DOI: 10.1007/s00232-018-0031-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [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: 10/28/2017] [Accepted: 03/13/2018] [Indexed: 01/04/2023]
Abstract
The potential therapeutic applications of plant polyphenols in various neurological, cardiovascular, metabolic and malignant disorders determine the relevance of studying the molecular mechanisms of their action on the cell membranes. Here, the quantitative changes in the physical parameters of model bilayer lipid membranes upon the adsorption of plant polyphenols were evaluated. It was shown that butein and naringenin significantly decreased the intrinsic dipole potential of cholesterol-free and cholesterol-enriched membranes. Cardamonin, 4'-hydroxychalcone, licochalcone A and liquiritigenin demonstrated the average efficiency, while resveratrol did not characterized by the ability to modulate the bilayer electrostatics. At the same time, the tested polyphenols affected melting of phospholipids with saturated acyl chains. The effects were attributed to the lipid disordering and a promotion of the positive curvature stress. According to DSC data and results of measurements of the threshold voltages that cause bilayer breakdown licochalcone A is the most effective agent. Furthermore, the role of the polyphenol induced changes in the electric and elastic properties of lipid host in the regulation of reconstituted ion channels was examined. The ability of the tested polyphenols to decrease the conductance of single ion channels produced by the antifungal cyclic lipopeptide syringomycin E was in agreement with their effects on the dipole potential of the lipid bilayers. The greatest effect of licochalcone A on the steady-state membrane conductance induced by the antifungal polyene macrolide antibiotic nystatin correlated with its greatest efficacy to induce the positive curvature stress. We also found that butein and naringenin bind specifically to a single pore formed by α-hemolysin from Staphylococcus aureus.
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Affiliation(s)
- Svetlana S Efimova
- Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky Ave. 4, St. Petersburg, Russia, 194064.
| | - Anastasiia A Zakharova
- Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky Ave. 4, St. Petersburg, Russia, 194064
| | - Roman Ya Medvedev
- Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky Ave. 4, St. Petersburg, Russia, 194064
| | - Olga S Ostroumova
- Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky Ave. 4, St. Petersburg, Russia, 194064
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Efimova SS, Chulkov EG, Ostroumova OS. Lipid-mediated mode of action of local anesthetics on lipid pores induced by polyenes, peptides and lipopeptides. Colloids Surf B Biointerfaces 2018. [PMID: 29525621 DOI: 10.1016/j.colsurfb.2018.02.051] [Citation(s) in RCA: 6] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The effects of local anesthetics (LAs), namely, lidocaine (LDC), prilocaine (PLC), mepivacaine (MPV), bupivacaine (BPV), procaine (PC), and tetracaine (TTC), on the steady-state transmembrane conductance induced by the cis-side addition of the antifungal polyene macrolide antibiotic, nystatin (NYS), in planar lipid bilayers were studied. The addition of TTC to model membranes comprising DOPC and cholesterol (33 mol%) led to a nearly twenty-fold increase in the steady-state NYS-induced membrane conductance. BPV slightly enhanced the channel-forming activity of polyene. LDC, PLC, MPV, and PC did not affect the NYS-induced transmembrane current. We concluded that the effects of LAs on the channel-forming activity of NYS were in agreement with their effects on the elastic properties of model membranes. The ability of aminoamide LAs to promote calcein leakage from large unilamellar DOPC-vesicles was decreased in the following order: BPV >> LDC ≈ PLC ≈ MPV. LDC, PLC, and MPV produced a graded leakage of fluorescent marker from liposomes, up to 10-13%. A initial sharp jump in fluorescence after the introduction of BPV was attributed to the solubilization of liposomes and the formation of mixed DOPC:BPV-micelles. Differential scanning microcalorimetry (DSC) of large unilamellar DPPC-vesicles showed that the main transition temperature (Tm) is continuously decreased upon increasing concentrations of TTC. A sharp drop in the enthalpy of the transition at higher TTC concentrations indicated a formation of anesthetic/lipid mixed micelles. In contrast to TTC, PC slightly decreased Tm, broadened the DSC signal and did not provoke vesicle-to-micelle transition. Both the calcein leakage and DSC data together with the results of measurements of threshold voltages that are required to cause the lipid bilayer breakdown might indicate an alteration in the curvature lipid packing stress, induced by BPV and TTC. The data presented here lend support to a lipid-mediated mode of LAs action on NYS pores via an alteration in curvature stress near the trans-mouth. Similar results were obtained for several lipid pores, formed by polyene amphotericin B, lipopeptide syringomycin E, and the peptides magainin and melittin. This finding further developed the concept of non-specific regulation of lipid pores by LAs. In conclusion, the combination of nystatin with LAs could be a novel treatment for efficient therapy of superficial and mucosal candidiasis.
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Affiliation(s)
- Svetlana S Efimova
- Institute of Cytology of the Russian Academy of Sciences, St. Petersburg 194064, Russia.
| | - Evgeny G Chulkov
- Institute of Cytology of the Russian Academy of Sciences, St. Petersburg 194064, Russia
| | - Olga S Ostroumova
- Institute of Cytology of the Russian Academy of Sciences, St. Petersburg 194064, Russia
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Efimova SS, Zakharova AA, Ismagilov AA, Schagina LV, Malev VV, Bashkirov PV, Ostroumova OS. Lipid-mediated regulation of pore-forming activity of syringomycin E by thyroid hormones and xanthene dyes. Biochim Biophys Acta Biomembr 2017; 1860:691-699. [PMID: 29253504 DOI: 10.1016/j.bbamem.2017.12.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 11/21/2017] [Accepted: 12/13/2017] [Indexed: 10/18/2022]
Abstract
The effects of dipole modifiers, thyroid hormones (thyroxine and triiodothyronine) and xanthene dyes (Rose Bengal, phloxineB, erythrosin, eosinY and fluorescein) on the pore-forming activity of the lipopeptide syringomycin E (SRE) produced by Pseudomonas syringae were studied in a model bilayer. Thyroxine does not noticeably influence the steady-state number of open SRE channels (Nop), whereas triiodothyronine decreases it 10-fold at -50mV. Rose Bengal, phloxine B and erythrosin significantly increase Nop by 350, 100 and 70 times, respectively. Eosin Y and fluorescein do not practically affect the pore-forming activity of SRE. Recently, we showed that hormones decrease the dipole potential of lipid bilayers by approximately 60mV at 50μM, while Rose Bengal, phloxine B and erythrosin at 2.5μM reduce the membrane dipole potential by 120, 80 and 50mV, respectively. In the present study using differential scanning microcalorimetry, confocal fluorescence microscopy, the calcein release technique and measurements of membrane curvature elasticity, we show that triiodothyronine strongly affects the fluidity of model membranes: its addition leads to a significant decrease in the temperature and cooperativity of the main phase transition of DPPC, calcein leakage from DOPC vesicles, fluidization of solid domains in DOPC/DPPC liposomes, and promotion of lipid curvature stress. Thyroxine exerts a weaker effect. Xanthene dyes do not influence the phase transition of DPPC. Despite the decrease in the dipole potential, thyroid hormones modulate SRE channels predominantly via the elastic properties of the membrane, whereas the xanthene dyes Rose Bengal, phloxine B and erythrosine affect SRE channels via bilayer electrostatics.
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Affiliation(s)
- Svetlana S Efimova
- Institute of Cytology of the Russian Academy of Sciences, St. Petersburg 194064, Russia.
| | | | - Artem A Ismagilov
- Institute of Cytology of the Russian Academy of Sciences, St. Petersburg 194064, Russia
| | - Ludmila V Schagina
- Institute of Cytology of the Russian Academy of Sciences, St. Petersburg 194064, Russia
| | - Valery V Malev
- Institute of Cytology of the Russian Academy of Sciences, St. Petersburg 194064, Russia; St. Petersburg State University, Petergof 198504, Russia
| | - Pavel V Bashkirov
- Federal Research and Clinical Centre of Physical-Chemical Medicine, Moscow 119435, Russia
| | - Olga S Ostroumova
- Institute of Cytology of the Russian Academy of Sciences, St. Petersburg 194064, Russia
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Efimova SS, Tevyashova AN, Olsufyeva EN, Bykov EE, Ostroumova OS. Pore-forming activity of new conjugate antibiotics based on amphotericin B. PLoS One 2017; 12:e0188573. [PMID: 29186162 PMCID: PMC5706719 DOI: 10.1371/journal.pone.0188573] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 11/09/2017] [Indexed: 01/02/2023] Open
Abstract
A series of amides of the antifungal antibiotic amphotericin B (AmB) and its conjugates with benzoxaboroles was tested to determine whether they form pores in lipid bilayers and to compare their channel characteristics. The tested derivatives produced pores of larger amplitude and shorter lifetime than those of the parent antibiotic. The pore conductance was related to changes in the partial charge of the hydrogens of the hydroxyl groups in the lactone ring that determined the anion coordination in the channel. Neutralization of one of the polar group charges in the AmB head during chemical modification produced a pronounced effect by diminishing the dwell time of the polyene channel compared to modification of both groups. In this study, compounds that had a modification of one carboxyl or amino group were less effective in initializing phase separation in POPC-membranes compared to derivatives that had modifications of both polar groups as well as the parent antibiotic. The effects were attributed to the restriction of the aggregation process by electrical repulsion between charged derivatives in contrast to neutral compounds. The significant correlation between the ability of derivatives to increase the permeability of model membranes—causing the appearance of single channels in lipid bilayers or inducing calcein leakage from unilamellar vesicles—and the minimal inhibitory concentration indicated that the antifungal effect of the conjugates was due to pore formation in the membranes of target cells.
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Affiliation(s)
- Svetlana S. Efimova
- Group of Ion Channel Modeling, Institute of Cytology of the Russian Academy of Sciences, St. Petersburg, Russia
- * E-mail:
| | - Anna N. Tevyashova
- Laboratory of Chemical Transformation of Antibiotics, Gause Institute of New Antibiotics of the Russian Academy of Medical Sciences, Moscow, Russia
- D.I. Mendeleev University of Chemical Technology of Russia, Moscow, Russia
| | - Evgenia N. Olsufyeva
- Laboratory of Chemical Transformation of Antibiotics, Gause Institute of New Antibiotics of the Russian Academy of Medical Sciences, Moscow, Russia
| | - Evgeny E. Bykov
- Laboratory of Chemical Transformation of Antibiotics, Gause Institute of New Antibiotics of the Russian Academy of Medical Sciences, Moscow, Russia
| | - Olga S. Ostroumova
- Group of Ion Channel Modeling, Institute of Cytology of the Russian Academy of Sciences, St. Petersburg, Russia
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Efimova SS, Schagina LV, Ostroumova OS. DIPOLE-MODIFYING EFFECT OF STYRYLPYRIDINIUM DYES AND FLAVONOIDS ON THE MODEL MEMBRANES OF DIFFERENT LIPID COMPOSITIONS. Tsitologiia 2017; 59:229-235. [PMID: 30183188] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The changes in the dipole potential of lipid bilayers (jd) mimicking cell membranes induced by the adsorption of low molecular weight amphiphiles, flavonoids (phloretin and quercetin) and styrylpyridinium dyes (RH 421 and RH 237) were measured. The method based on the determination of ionophore-induced transmembrane current was used to evaluate the changes in jd after the addition of the modifiers. The characteristic parameters of the Langmuir adsorption isotherm, the maximum changes in jd at an infinitely large concentration of flavonoid and its desorption constant, which reflects the affinity of the flavonoid to the lipid phase, were determined. The slopes of linear dependencies of increasing in jd on the concentration of the styrylpiridinium dyes in membrane bathing solution were defined. It was found that the dipole-modifying effect of phloretin depends on the charge of the lipids forming the membranes, while the ability of quercetin to reduce jd turned on the initial hydration of the bilayers. The results indicated on the different mechanisms of the decrease in jd at the adsorption of tested flavonoids. It was shown that the changes in jd at the incorporation of styrylpyridinium dyes into bilayers is determined by the interaction of the modifiers with the membrane components.
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Efimova SS, Medvedev RY, Schagin LV, Ostroumova OS. NCREASING OF THE FLUIDITY OF MODEL LIPID MEMBRANES UNDER THE INFLUENCE OF LOCAL ANESTHETICS. Tsitologiia 2016; 58:378-384. [PMID: 30188636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
We have studied the effect of local anesthetics on the permeability of phospholipid liposomes of various composition to calcein. We have tested amides (lidocaine, prilocaine, mepivacaine and bupivacaine) and ester anesthetics (benzocaine, procaine and tetracaine). The permeability of large unilamellar liposomes to calcein has been determined by measuring the relative fluorescence intensity of calcein released from the phospholipid vesicles. We have shown that all tested amide anesthetics have little of feet on the leakage of calcein from dioleoylphosphocholine (DOPC) liposomes. The most effective amide was did bupivacaine. Substitution in the membranes of 20 mol % DOPC on tetraoleoylcardiolipin (TOCL) was did accompanied by increased activity of amides. Benzocaine and procaine at concentration up to 100 mM practically did not change DOPC liposome permeability. Addition of tetracaine up to concentration of 2 mM did not affect the permeability of vesicl. Further increas in the anesthetic concentration up to 50 mM led to increase in the intensity of calcein fluorescence and, at a concentration of 100 mM, a complete engagement of fluorescent marker was observed. In the case of vesicles including 20 mol % TOCL, the threshold concentration of tetracaine and the concentration that corresponded to 100% leakage of calcein were been 7 and 20 mM, respectively. Using confocal fluorescence microscopy of giant unilamellar vesicles formed from an equimolar mixture of DOPC and tetramyristoylcardiolipin (TMCL), we have shown that anesthetics destroy solid ordered domains, and this ability increases in the order: procaine d mepivacaine < bupivacaine n tetracaine. The revealed differences in the effect of local anesthetics might be caused by different depth of immersion of the anesthetics into the membrane.
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Efimova SS, Malev VV, Ostroumova OS. Effects of Dipole Potential Modifiers on Heterogenic Lipid Bilayers. J Membr Biol 2015; 249:97-106. [PMID: 26454655 DOI: 10.1007/s00232-015-9852-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 07/01/2015] [Accepted: 09/29/2015] [Indexed: 01/29/2023]
Abstract
In this work, we examine the ability of dipole modifiers, flavonoids, and RH dyes to affect the dipole potential (φ d) and phase separation in membranes composed of ternary mixtures of POPC with different sphingolipids and sterols. Changes in the steady-state conductance induced by cation-ionophore complexes have been measured to evaluate the changes in dipole potential of planar lipid bilayers. Confocal fluorescence microscopy has been employed to investigate lipid segregation in giant unilamellar vesicles. The effects of flavonoids on φ d depend on lipid composition and dipole modifier type. The effectiveness of RH dyes to increase φ d depends on sphingolipid type but is not influenced by sterol content. Tested modifiers lead to partial or complete disruption of gel domains in bilayers composed of POPC, sphingomyelin, and cholesterol. Substitution of cholesterol to ergosterol or 7-dehydrocholesterol leads to a loss of fluidizing effects of modifiers except phloretin. This may be due to various compositions of gel domains. The lack of influence of modifiers on phase scenario in vesicles composed of ternary mixtures of POPC, cholesterol, and phytosphingosine or sphinganine is related to an absence of gel-like phase. It was concluded that the membrane lateral heterogeneity affects the dipole-modifying abilities of the agents that influence the magnitude of φ d by intercalation into the bilayer and orientation of its own large dipole moments (phloretin and RH dyes). The efficacy of modifiers that do not penetrate deeply and affect φ d through water adsorption (phlorizin, quercetin, and myricetin) is not influenced by lateral heterogeneity of membrane.
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Affiliation(s)
- Svetlana S Efimova
- Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky ave. 4, St. Petersburg, Russia, 194064.
| | - Valery V Malev
- Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky ave. 4, St. Petersburg, Russia, 194064.,St. Petersburg State University, Petergof, Russia, 198504
| | - Olga S Ostroumova
- Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky ave. 4, St. Petersburg, Russia, 194064
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Efimova SS, Zakharov VV, Ostroumova OS. [The influence of dipole modifiers on the channel-forming activity of amyloid and amyloid-like peptides in lipid bilayers]. Tsitologiia 2015; 57:144-152. [PMID: 26035972] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We have studied the steady-state transmembrane current induced by amyloid and amyloid-like peptides in lipid bilayers in the presence of dipole modifiers. It has been shown that the addition of dipole modifier, phloretin, to the membrane bathing solutions leads to an increase in the multichannel activity of amyloid beta-peptide fragment 25-35, [Gly35]-amyloid beta-peptide fragment 25--35, prion protein fragment 106-126 and amyloid-like peptides myr-BASP1 (1--13), myr-BASP1(1--19) and GAP-43(1--40). We have found that the effect of phloretin is not the result of dipole potential changes due to adsorption of this modifier on the membrane. Using the various fragments of amyloid beta-peptide, presenilin, prion protein and neuronal proteins BASP1 and GAP-43 allowes to conclude that the steady-state peptide-induced transmembrane current in the case of addition of phloretin is due to the electrostatic interaction between the positively charged channel-forming agents and negatively charged dipole modifier. The results obtained by electron microscopy have demonstrated that this interaction increases degree of peptide oligomerization.
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Chulkov EG, Efimova SS, Schagina LV, Ostroumova OS. Direct visualization of solid ordered domains induced by polyene antibiotics in giant unilamellar vesicles. Chem Phys Lipids 2014; 183:204-7. [DOI: 10.1016/j.chemphyslip.2014.07.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2014] [Revised: 07/18/2014] [Accepted: 07/22/2014] [Indexed: 10/25/2022]
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Efimova SS, Schagina LV, Ostroumova OS. Channel-forming activity of cecropins in lipid bilayers: effect of agents modifying the membrane dipole potential. Langmuir 2014; 30:7884-92. [PMID: 24969512 DOI: 10.1021/la501549v] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Cecropin A (CecA) and cecropin B (CecB) added to one side of a bilayer formed from equimolar mixtures of DOPS and DOPE, DPhPS and DPhPE, or DOPS, DOPE, and Chol leads to the formation of well-defined and well-reproducible ion channels of different conductance levels while cecropin P1 (CecP1) does not induce pore formation at micromolar concentrations. We found three populations of CecA channels: pores with weak cationic selectivity, pores with weak anionic selectivity, and pores that were nonselective. The dipole modifiers, flavonoids and styryl dyes, were used to modulate the channel-forming activity of CecA and CecB. The mean conductance of single CecA channels is affected by the influence of dipole modifiers on the lipid packing in the membrane. A decrease in the membrane dipole potential is accompanied by a decrease in the steady-state transmembrane current induced by CecA and CecB in cholesterol-free and cholesterol-containing bilayers. The observed changes in the channel-forming activity might be caused by an increase in the energy barrier for the interfacial accumulation of cecropin monomers. This finding indicates that the negative pole of the cecropin dipole is inserted into the membrane.
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Affiliation(s)
- Svetlana S Efimova
- Institute of Cytology of the Russian Academy of Sciences , St. Petersburg 194064, Russia
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Ostroumova OS, Efimova SS, Schagina LV. Phloretin-induced reduction in dipole potential of sterol-containing bilayers. J Membr Biol 2013; 246:985-91. [PMID: 24129663 DOI: 10.1007/s00232-013-9603-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2013] [Accepted: 09/28/2013] [Indexed: 11/25/2022]
Abstract
The phloretin-induced reduction in the dipole potential of planar lipid bilayers containing cholesterol, ergosterol, stigmasterol, 7-dehydrocholesterol and 5α-androstan-3β-ol was investigated. It is shown that effects depend on the type and concentration of membrane sterol. It is supposed that the effectiveness of phloretin in reducing the dipole potential of the bilayers that contain cholesterol, ergosterol and 7-dehydrocholesterol correlates with the ordering and condensing effects. The role of the concentration-dependent ability of different sterols to promote lateral heterogeneity in membranes is also discussed.
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Affiliation(s)
- Olga S Ostroumova
- Institute of Cytology of the Russian Academy of Sciences, Tikhoretsky Ave. 4, Saint Petersburg, 194064, Russia,
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Ostroumova OS, Efimova SS, Shchagina LV. [Changes of dipole potential of phospholipid membranes resulted from flavonoid adsorption]. Biofizika 2013; 58:474-480. [PMID: 24159816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The effects of flavonoids, phloridzin, quercetin, myricetin and biochanin A on the dipole potential of planar lipid bilayers formed from dioleylphosphoethanolamine, dioleylphosphoserine, dioleoylphosphocholine, and diphytanoylphosphocholine are investigated. The characteristic parameters of the Langmuir adsorption isotherm, the maximum changes in the membrane dipole potential at an infinitely large concentration of flavonoid and its dissociation constant, which reflects the affinity of flavonoid to the membrane lipids, are determined. Modifying effects of chalcones, flavonols and isoflavones are compared. The influence of the surface charge of the lipid bilayer and the spontaneous curvature of the membrane-forming phospholipids on the adsorption of flavonoids on the model membranes is discussed.
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Mikhaĭlova EV, Efimova SS, Ostroumova OS. [The effects of RH 421 on the activity of amphotericin B in cell and model membranes]. Tsitologiia 2013; 55:136-139. [PMID: 23718076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The combined action of polyene macrolide antibiotic amphotericin B and styryl dye RH 421 in model lipid membranes and in yeast Saccharomyces cerevisiae has been studied. RH 421 insertion inti the ergosterol-containing lipid bilayers led to the increase of the steady-state number of open amphotericin channels by 8.5 +/- 3.2 times. Paper disk agar diffusion method has demonstrated that RH 421 enhanced the antimicrobial effect of amphotericin B leading to an increase in the zone of growth inhibition of S. cerevisiae strain by 1.5 times. Our data suggest that RH 421 is a potential synergist of amphotericin B and can be used in new formulations with improved pharmacological properties.
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Abstract
Recently, we showed that the effect of dipole modifiers (flavonoids and styrylpyridinium dyes) on the conductance of single amphotericin B (AmB) channels in sterol-containing lipid bilayers primarily resulted from changes in the membrane dipole potential. The present study examines the effect of dipole modifiers on the AmB multi-channel activity. The addition of phloretin to cholesterol-containing membranes leads to a significant increase in the steady-state AmB-induced transmembrane current. Quercetin significantly decreases and RH 421 increases the current through ergosterol-containing bilayers. Other tested flavonoids and styrylpyridinium dyes do not affect the channel-forming activity of AmB independently on the sterol composition of the bilayers. The effects obtained in these trials may instead be attributed to the direct interaction of dipole modifiers with AmB/sterol complexes and not to the effect of dipole potential changes. The presence of double bonds in the Δ7 and Δ22 positions of sterol molecules, the number of conjugated double bonds and amino sugar residues in polyene molecules, and the conformation and adsorption plane of dipole modifiers are important factors impacting this interaction.
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Affiliation(s)
- Olga S Ostroumova
- Institute of Cytology of the Russian Academy of Sciences, St. Petersburg, Russia.
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Abstract
The effects of various subclasses of flavonoids, Rose Bengal, and different styrylpyridinium dyes on the magnitude of the dipole potential of membranes composed of pure phospholipids and sterol-containing bilayers were investigated. Changes in the steady-state membrane conductance induced by cation-ionophore complexes were measured to examine the changes in the dipole potential of lipid bilayers. The characteristic parameters of the Langmuir adsorption isotherm for different flavonoids and Rose Bengal and the slope of the linear dependence of the dipole potential change on the aqueous concentrations of RH dyes were estimated. Chalcones (phloretin and phloridzin) and flavonols (quercetin and myricetin) strictly decrease the dipole potential of phospholipid- and sterol-containing membranes; the unsaturation of the C-ring and the hydrophobicity of the molecule contribute to the ability of the flavonoid to reduce the bilayer dipole potential. Rose Bengal decreases the magnitude of the bilayer dipole potential to a similar extent, but its affinity for membrane lipids is higher; the effects of RH dyes, chalcones, and phloroglucinol are determined by sterol concentration and type.
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Affiliation(s)
- Svetlana S Efimova
- Institute of Cytology of the Russian Academy of Sciences, St. Petersburg 194064, Russia
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Abstract
The effects of dipole modifiers and their structural analogs on the single channel activity of amphotericin B in sterol-containing planar phosphocholine membranes are studied. It is shown that the addition of phloretin in solutions bathing membranes containing cholesterol or ergosterol decreases the conductance of single amphotericin B channels. Quercetin decreases the channel conductance in cholesterol-containing bilayers while it does not affect the channel conductance in ergosterol-containing membranes. It is demonstrated that the insertion of styryl dyes, such as RH 421, RH 237 or RH 160, in bilayers with either cholesterol or ergosterol leads to the increase of the current amplitude of amphotericin B pores. Introduction of 5α-androstan-3β-ol into a membrane-forming solution increases the amphotericin B channel conductance in a concentration-dependent manner. All the effects are likely to be attributed to the influence of the membrane dipole potential on the conductance of single amphotericin B channels. However, specific interactions of some dipole modifiers with polyene-sterol complexes might also contribute to the activity of single amphotericin B pores. It has been shown that the channel dwell time increases with increasing sterol concentration, and it is higher for cholesterol-containing membranes than for bilayers including ergosterol, 6-ketocholestanol, 7-ketocholestanol or 5α-androstan-3β-ol. These findings suggest that the processes of association/dissociation of channel forming molecules depend on the membrane fluidity.
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Affiliation(s)
- Olga S Ostroumova
- Institute of Cytology of the Russian Academy of Sciences, St. Petersburg, Russia.
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Efimova SS, Ostroumova OS. Effects of Flavonoids on Dipole Potential of Sterol-Containing Membranes. Biophys J 2012. [DOI: 10.1016/j.bpj.2011.11.3876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022] Open
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Ostroumova OS, Efimova SS, Schagina LV. 5- and 4'-Hydroxylated flavonoids affect voltage gating of single alpha-hemolysin pore. Biochim Biophys Acta 2011; 1808:2051-8. [PMID: 21527242 DOI: 10.1016/j.bbamem.2011.04.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2011] [Revised: 03/27/2011] [Accepted: 04/11/2011] [Indexed: 10/18/2022]
Abstract
Molecular mechanisms of the influence of flavonoids on the voltage gating of a single alpha-hemolysin channel in planar lipid membranes are studied. It is shown that the addition of flavonoids hydroxylated in position 5 of the A-ring and in position 4' of the B-ring into bilayer bathing solution shifts the voltage dependence of channel switching from high- to low-conductance states to voltages nearer zero. It is concluded that the effect is likely to be attributed to a specific interaction of at least three flavonoid molecules with the voltage sensor of an alpha-hemolysin pore. Possible flavonoid binding sites and identification of amino acid residues included into the voltage sensor domain of the alpha-hemolysin channel are discussed.
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Affiliation(s)
- Olga S Ostroumova
- Institute of Cytology of the Russian Academy of Sciences, St. Petersburg 194064, Russia.
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Efimova SS, Ostroumova OS, Malev VV, Shchagina LV. [Transport of large organic ions through syringomycin channels in the membranes containing dipole modifiers]. Tsitologiia 2011; 53:450-456. [PMID: 21786689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The effect of the membrane dipole potential (Phid) on a conductance and a steady-state number of functioning channels formed by cyclic lipodepsipeptide syringomycin E (SRE) in bilayer lipid membranes made from phosphocholine and bathed in 0.4 M solution of sodium salts of aspartate, gluconate and chloride was shown. The magnitude of Phid was varied with the introduction to membrane bathing solutions of phloretin, which reduces the Phid, and RH 421, increasing the Phid. It was established that in all studied systems the increase in the membrane dipole potential cause a decrease in the steady-state number of open channels. In the systems containing sodium salts of aspartate (Asp) or gluconate (Glc), changes in the number of functioning channels are in an order of magnitude smaller than in systems containing sodium chloride. At the same time, the conductance (g) of single SRE-channels on the membranes bathed in NaCI solution increases with the increase in Phid, and in the systems containing NaAsp or NaGlc the conductance of single channels does not depend on the Phid. The latter is due to the lack of cation/anion selectivity of the SRE-channels in these systems. The different channel-forming activity of SRE in the experimental systems is defined by the gating charge of the channel and the partition coefficient of the dipole modifiers between the lipid and aqueous phases.
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Vassilevski AA, Fedorova IM, Maleeva EE, Korolkova YV, Efimova SS, Samsonova OV, Schagina LV, Feofanov AV, Magazanik LG, Grishin EV. Novel class of spider toxin: active principle from the yellow sac spider Cheiracanthium punctorium venom is a unique two-domain polypeptide. J Biol Chem 2010; 285:32293-302. [PMID: 20657014 DOI: 10.1074/jbc.m110.104265] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Venom of the yellow sac spider Cheiracanthium punctorium (Miturgidae) was found unique in terms of molecular composition. Its principal toxic component CpTx 1 (15.1 kDa) was purified, and its full amino acid sequence (134 residues) was established by protein chemistry and mass spectrometry techniques. CpTx 1 represents a novel class of spider toxin with modular architecture. It consists of two different yet homologous domains (modules) each containing a putative inhibitor cystine knot motif, characteristic of the widespread single domain spider neurotoxins. Venom gland cDNA sequencing provided precursor protein (prepropeptide) structures of three CpTx 1 isoforms (a-c) that differ by single residue substitutions. The toxin possesses potent insecticidal (paralytic and lethal), cytotoxic, and membrane-damaging activities. In both fly and frog neuromuscular preparations, it causes stable and irreversible depolarization of muscle fibers leading to contracture. This effect appears to be receptor-independent and is inhibited by high concentrations of divalent cations. CpTx 1 lyses cell membranes, as visualized by confocal microscopy, and destabilizes artificial membranes in a manner reminiscent of other membrane-active peptides by causing numerous defects of variable conductance and leading to bilayer rupture. The newly discovered class of modular polypeptides enhances our knowledge of the toxin universe.
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Affiliation(s)
- Alexander A Vassilevski
- M. M. Shemyakin and Yu. A. Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow 117997
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Ostroumova OS, Efimova SS, Shchagina LV. [Conductance of phytotoxin channels in the presence of large organic ions]. Tsitologiia 2009; 51:670-675. [PMID: 19799351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In this study we evaluated the effect of penetrating anion size on the properties of the channels formed by cyclic lipodepsipeptide syringomycin E (SRE) in bilayer lipid membranes. Conductance and the mean lifetime of the SRE channels have been measured in 0.4 M solutions of sodium chloride, aspartate, and gluconate. Comparison of the results of conductometrical and electrophysiological measurements has shown: 1) ratio of mobilities of aspartate anions in the channel and in the water solution is 5 times lower than that for chlorine anions; 2) conductivity of the channels in the presence of sodium gluconate is due mainly to cations. The results obtained indicate binding of the penetrating anions to the selective filter of the SRE pore. The radius of the SRE channel selective filter has been established (r - 0.3 nm) and its localization in the cis-mouth of the pore has been found.
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