1
|
Ayed A, Essid R, Mankai H, Echmar A, Fares N, Hammami M, Sewald N, Limam F, Tabbene O. Synergistic antifungal activity and potential mechanism of action of a glycolipid-like compound produced by Streptomyces blastmyceticus S108 against Candida clinical isolates. J Appl Microbiol 2023; 134:lxad246. [PMID: 37884451 DOI: 10.1093/jambio/lxad246] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2022] [Revised: 09/04/2023] [Accepted: 10/25/2023] [Indexed: 10/28/2023]
Abstract
AIM The present study aimed to investigate a novel antifungal compound produced by Streptomyces blastmyceticus S108 strain. Its effectiveness against clinical isolates of Candida species and its synergistic effect with conventional antifungal drugs were assessed, and its molecular mechanism of action was further studied against Candida albicans. METHODS AND RESULTS A newly isolated strain from Tunisian soil, S. blastmyceticus S108, showed significant antifungal activity against Candida species by well diffusion method. The butanolic extract of S108 strain supernatant exhibited the best anti-Candida activity with a minimal inhibitory concentration (MIC) value of 250 μg ml-1, determined by the microdilution method. The bio-guided purification steps of the butanolic extract were performed by chromatographic techniques. Among the fractions obtained, F13 demonstrated the highest level of activity, displaying a MIC of 31.25 μg ml-1. Gas chromatography-mass spectrometry and electrospray ionization mass spectrometry analyses of this fraction (F13) revealed the glycolipidic nature of the active molecule with a molecular weight of 685.6 m/z. This antifungal metabolite remained stable to physicochemical changes and did not show hemolytic activity even at 4MIC corresponding to 125 µg ml-1 toward human erythrocytes. Besides, the glycolipid compound was combined with 5-flucytosine and showed a high synergistic effect with a fractional inhibitory concentration index value 0.14 against C. albicans ATCC 10231. This combination resulted in a decrease of MIC values of 5-flucytosine and the glycolipid-like compound by 8- and 64-fold, respectively. The examination of gene expression in treated C. albicans cells by quantitative polymerase chain reaction (qPCR) revealed that the active compound tested alone or in combination with 5-flucytosine blocks the ergosterol biosynthesis pathway by downregulating the expression of ERG1, ERG3, ERG5, ERG11, and ERG25 genes. CONCLUSION AND IMPACT OF THE STUDY The new glycolipid-like compound, produced by Streptomyces S108 isolate, could be a promising drug for medical use against pathogenic Candida isolates.
Collapse
Affiliation(s)
- A Ayed
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
| | - R Essid
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
| | - H Mankai
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
| | - A Echmar
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
| | - N Fares
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
| | - M Hammami
- Laboratory of Aromatic and Medicinal Plants, Center of Biotechnology of Borj Cedria, Hammam-Lif 2050, Tunisia
| | - N Sewald
- Organic and Bioorganic Chemistry, Faculty of Chemistry, Bielefeld University, 33615 Bielefeld, Germany
| | - F Limam
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
| | - O Tabbene
- Laboratory of Bioactive Substances, Center of Biotechnology of Borj Cedria, BP 901, Hammam-Lif 2050, Tunisia
| |
Collapse
|
2
|
Y. Desta Z, Sewald N. Isolation of non-cytotoxic crotepoxide from the root bark of Croton macrostachyus and the reassignment of its structure. B CHEM SOC ETHIOPIA 2018. [DOI: 10.4314/bcse.v31i3.10] [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
|
3
|
|
4
|
Santos-Carballal B, Aaldering LJ, Ritzefeld M, Pereira S, Sewald N, Moerschbacher BM, Götte M, Goycoolea FM. Physicochemical and biological characterization of chitosan-microRNA nanocomplexes for gene delivery to MCF-7 breast cancer cells. Sci Rep 2015; 5:13567. [PMID: 26324407 PMCID: PMC4555168 DOI: 10.1038/srep13567] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [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: 05/26/2015] [Accepted: 07/30/2015] [Indexed: 11/09/2022] Open
Abstract
Cancer gene therapy requires the design of non-viral vectors that carry genetic material and selectively deliver it with minimal toxicity. Non-viral vectors based on cationic natural polymers can form electrostatic complexes with negatively-charged polynucleotides such as microRNAs (miRNAs). Here we investigated the physicochemical/biophysical properties of chitosan-hsa-miRNA-145 (CS-miRNA) nanocomplexes and the biological responses of MCF-7 breast cancer cells cultured in vitro. Self-assembled CS-miRNA nanocomplexes were produced with a range of (+/-) charge ratios (from 0.6 to 8) using chitosans with various degrees of acetylation and molecular weight. The Z-average particle diameter of the complexes was <200 nm. The surface charge increased with increasing amount of chitosan. We observed that chitosan induces the base-stacking of miRNA in a concentration dependent manner. Surface plasmon resonance spectroscopy shows that complexes formed by low degree of acetylation chitosans are highly stable, regardless of the molecular weight. We found no evidence that these complexes were cytotoxic towards MCF-7 cells. Furthermore, CS-miRNA nanocomplexes with degree of acetylation 12% and 29% were biologically active, showing successful downregulation of target mRNA expression in MCF-7 cells. Our data, therefore, shows that CS-miRNA complexes offer a promising non-viral platform for breast cancer gene therapy.
Collapse
Affiliation(s)
- B Santos-Carballal
- Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossgarten 3, D-48149 Münster, Germany
| | - L J Aaldering
- Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossgarten 3, D-48149 Münster, Germany
| | - M Ritzefeld
- Organic and Bioorganic Chemistry, Bielefeld University, Universitätsstrasse 25, D-33615 Bielefeld, Germany
| | - S Pereira
- Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossgarten 3, D-48149 Münster, Germany
| | - N Sewald
- Organic and Bioorganic Chemistry, Bielefeld University, Universitätsstrasse 25, D-33615 Bielefeld, Germany
| | - B M Moerschbacher
- Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossgarten 3, D-48149 Münster, Germany
| | - M Götte
- Department of Gynecology and Obstetrics, University of Münster, Albert-Schweitzer-Campus 1, D-48149 Münster, Germany
| | - F M Goycoolea
- Institute of Plant Biology and Biotechnology (IBBP), University of Münster, Schlossgarten 3, D-48149 Münster, Germany
| |
Collapse
|
5
|
Ritzefeld M, Wollschläger K, Niemann G, Anselmetti D, Sewald N. Minor groove recognition is important for the transcription factor PhoB: a surface plasmon resonance study. Mol Biosyst 2011; 7:3132-42. [PMID: 21912786 DOI: 10.1039/c1mb05281k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The two-component regulatory system PhoR/PhoB induces the expression of several genes in response to phosphate starvation in Escherichia coli. In order to quantify these protein-DNA interactions and to study the time-resolved dynamics of the binding mechanism, the specific recognition of different oligonucleotide duplexes by the DNA-binding domain of PhoB (PhoB(DBD)) was analyzed using surface plasmon resonance. In addition the two point mutants PhoB(DBD)D196A and PhoB(DBD)R219A were obtained and the DNA recognition in comparison to the wildtype PhoB(DBD) was investigated. Aspartic acid 196 and arginine 219 mediate specific minor groove interactions. All results reveal that at high PhoB(DBD)-concentrations all recognition sequences of the pho box are occupied. Decreasing the protein amount results in a mixture of free oligonucleotides and DNA molecules occupied by two WT-PhoB(DBD). Moreover, the SPR results indicate that both binding site segments, the TGTCA-motif and the A/T-rich minor groove, are essential for the binding process. A comparison of different regulons additionally proved the dependency of the recognition process on the base composition of the minor groove.
Collapse
Affiliation(s)
- M Ritzefeld
- Organic and Bioorganic Chemistry, Bielefeld University, PO Box 100131, 33501 Bielefeld, Germany
| | | | | | | | | |
Collapse
|
6
|
Awantu AF, Lenta BN, Bogner T, Fongang YF, Ngouela S, Wansi JD, Tsamo E, Sewald N. Dialiumoside, an Olean-18-ene Triterpenoid from Dialium excelsum. Z Naturforsch B 2011. [DOI: 10.5560/znb.2011.66b0624] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
7
|
Vass E, Strijowski U, Wollschläger K, Mándity IM, Szilvágyi G, Jewgiński M, Gaus K, Royo S, Majer Z, Sewald N, Hollósi M. VCD studies on cyclic peptides assembled from L-α-amino acids and a trans-2-aminocyclopentane- or trans-2-aminocyclohexane carboxylic acid. J Pept Sci 2010; 16:613-20. [DOI: 10.1002/psc.1272] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
8
|
Budke C, Heggemann C, Koch M, Sewald N, Koop T. Ice Recrystallization Kinetics in the Presence of Synthetic Antifreeze Glycoprotein Analogues Using the Framework of LSW Theory. J Phys Chem B 2009; 113:2865-73. [DOI: 10.1021/jp805726e] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- C. Budke
- Department of Chemistry, Physical Chemistry, Bielefeld University, Bielefeld, Germany, and Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
| | - C. Heggemann
- Department of Chemistry, Physical Chemistry, Bielefeld University, Bielefeld, Germany, and Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
| | - M. Koch
- Department of Chemistry, Physical Chemistry, Bielefeld University, Bielefeld, Germany, and Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
| | - N. Sewald
- Department of Chemistry, Physical Chemistry, Bielefeld University, Bielefeld, Germany, and Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
| | - T. Koop
- Department of Chemistry, Physical Chemistry, Bielefeld University, Bielefeld, Germany, and Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
| |
Collapse
|
9
|
Latajka R, Jewginski M, Makowski M, Pawełczak M, Huber T, Sewald N, Kafarski P. Pentapeptides containing two dehydrophenylalanine residues--synthesis, structural studies and evaluation of their activity towards cathepsin C. J Pept Sci 2008; 14:1084-95. [PMID: 18523964 DOI: 10.1002/psc.1045] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Synthesis, structural and biological studies of pentapeptides containing two DeltaPhe residues (Z and E isomers) in position 2 and 4 in peptide chain were performed. All the investigated peptides adopted bent conformation and majority of them could exist as two different conformers in solution. Only pentapeptides, containing free N-termini appeared to act as weak inhibitors of cathepsin C with the slow-binding, competitive mechanism of inhibition, free acids being bound slightly better than their methyl esters. Results of molecular modeling suggested significant difference between peptides, depending of the type of amino acid residue in position 5 in peptide chain. Dehydropeptides containing Gly residue in this position may act as competitive slow-reacting substrates and therefore exhibit inhibitory-like properties.
Collapse
Affiliation(s)
- R Latajka
- Department of Bioorganic Chemistry, Faculty of Chemistry, Wrocław University of Technology, Wybrzeze Wyspianskiego 27, 50-370 Wroclaw, Poland.
| | | | | | | | | | | | | |
Collapse
|
10
|
Wobbe L, Zimmermann D, Wißbrock M, Urman S, Sewald K, Malešević M, Sewald N. Integrin α5β1: a new purification strategy based on immobilized peptides. ACTA ACUST UNITED AC 2008. [DOI: 10.1111/j.1747-0285.2006.00359.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
11
|
Guthöhrlein EW, Malešević M, Majer Z, Sewald N. Secondary structure inducing potential of β-amino acids: Torsion angle clustering facilitates comparison and analysis of the conformation during MD trajectories. Biopolymers 2007; 88:829-39. [DOI: 10.1002/bip.20859] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
12
|
Brinker A, Weber E, Stoll D, Voigt J, Müller A, Sewald N, Jung G, Wiesmüller KH, Bohley P. Highly potent inhibitors of human cathepsin L identified by screening combinatorial pentapeptide amide collections. Eur J Biochem 2000; 267:5085-92. [PMID: 10931191 DOI: 10.1046/j.1432-1327.2000.01570.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
By screening a combinatorial pentapeptide amide collection in an inhibition assay, we systematically evaluated the potential of 19 proteinogenic amino acids and seven nonproteinogenic amino acids to serve as building blocks for inhibitors of human cathepsin L. Particularly efficient were aromatic, bulky, hydrophobic amino-acid residues, especially leucine, and positively charged residues, especially arginine. Building blocks for potential inhibitory peptides were combined by random selection from their activity pattern. This random approach for the design of inhibitors was introduced to compensate for the inaccuracy induced by shifted docking of combinatorial compound collections at the active center of cathepsin L. Thereby, we obtained structurally defined pentapeptide amides which inhibited human cathepsin L at nanomolar concentrations. Among the most potent novel inhibitors, one peptide, RKLLW-NH2, shares the amphiphilic character of the nonamer fragment VMNGLQNRK of the autoinhibitory, substrate-like, but reverse-binding prosegment of human cathepsin L which blocks the active center of the enzyme. Obviously, RKLLW-NH2 carries the functions that are important for enzyme-peptide interaction in a condensed form. This hypothesis was confirmed by structure-activity studies using truncated and modified pentapeptides.
Collapse
Affiliation(s)
- A Brinker
- Physiologisch-chemisches Institut and Naturwissenschaftliches und Medizinisches an der Universität Tübingen, Germany
| | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Abstract
The conformation of oligomers of beta-amino acids of the general type Ac-[beta-Xaa]n-NHMe (beta-Xaa = beta-Ala, beta-Aib, and beta-Abu; n = 1-4) was systematically examined at different levels of ab initio molecular orbital theory (HF/6-31G*, HF/3-21G). The solvent influence was considered employing two quantum-mechanical self-consistent reaction field models. The results show a wide variety of possibilities for the formation of characteristic elements of secondary structure in beta-peptides. Most of them can be derived from the monomer units of blocked beta-peptides with n = 1. The stability and geometries of the beta-peptide structures are considerably influenced by the side-chain positions, by the configurations at the C alpha- and C beta-atoms of the beta-amino acid constituents, and especially by environmental effects. Structure peculiarities of beta-peptides, in particular those of various helix alternatives, are discussed in relation to typical elements of secondary structure in alpha-peptides.
Collapse
Affiliation(s)
- K Möhle
- Institute of Physical and Theoretical Chemistry, Faculty of Chemistry and Mineralogy, Leipzig, Germany
| | | | | | | | | |
Collapse
|
14
|
Winkler D, Sewald N, Burger K, Chung NN, Schiller PW. Enkephalin analogs containing 4,4-difluoro-2-aminobutyric acid: synthesis and fluorine effect on the biological activity. J Pept Sci 1998; 4:496-501. [PMID: 9927256 DOI: 10.1002/(sici)1099-1387(199812)4:8%3c496::aid-psc170%3e3.0.co;2-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Analogs of Met-enkephalin and [D-Pen2, D-Pen5]enkephalin (DPDPE) containing the partially fluorinated amino acid 4,4-difluoro-2-aminobutyric acid (DFAB) in the 2- or 3-position of the peptide sequence were synthesized and their opioid activities and receptor selectivities were determined in vitro. The linear fluorinated [D-DFAB2, Met5-NH2]enkephalin showed mu and delta agonist potencies comparable to those of natural [Leu5]enkephalin. The partially fluorinated DPDPE analogs behaved differently as compared with their non-fluorinated correlates. While L-amino acid substitution in position 3 of DPDPE usually resulted in higher delta agonist potency than D-amino acid substitution. [D-DFAB3]DPDPE turned out to be a more potent delta agonist than [L-DFAB3]DPDPE. Furthermore, [D-DFAB3]DPDPE showed over 100-fold higher delta agonist potency than [D-Abu3]DPDPE (Abu = 2-aminobutyric acid), indicating that the fluorine substituents interact favorably with a delta opioid receptor subsite.
Collapse
Affiliation(s)
- D Winkler
- Department of Organic Chemistry, University of Leipzig, Germany
| | | | | | | | | |
Collapse
|
15
|
Abstract
A series of model peptides containing alpha-trifluoromethyl-substituted amino acids in five different positions relative to the predominant cleavage site of the serine protease alpha-chymotrypsin was synthesized by solution methods to investigate the influence of alpha-Tfm substitution on the proteolytic stability of peptides. Proteolysis studies demonstrated absolute stability of peptides substituted to the P1 position and still considerable proteolytic stability for peptides substituted at the P2 and P'2 positions compared with the corresponding unsubstituted model peptide. Comparison with peptides containing the fluorine-free disubstituted amino acid alpha-aminoisobutyric acid allowed to separate electronic from steric effects. Furthermore, the absolute configuration of the alpha-Tfm-substituted amino acid was found to exert considerable effects on the proteolytic stability, especially in P'1 substituted peptides. Investigations of this phenomenon using empirical force field calculations revealed that in the (S,R,S)-diasteromer the steric constraints exhibited by the alpha-Tfm group can be outweighed by an advantageous interaction of the flourine atoms with the serine side chain of the enzyme. In contrast, a favourable interaction between substrate and enzyme is impossible for the (S,S,S)-diastereomer.
Collapse
Affiliation(s)
- B Koksch
- Institut für Biochemie, Universität Leipzig, Germany
| | | | | | | | | |
Collapse
|
16
|
Sewald N. Stereoselective synthesis of?-amino acids via conjugate addition of nitrogen nucleophiles to?,?-unsaturated esters ? Recent advances. Amino Acids 1996; 11:397-408. [DOI: 10.1007/bf00807944] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/1996] [Accepted: 03/29/1996] [Indexed: 11/30/2022]
|
17
|
Sewald N, Burger K. Reactions of 3,3,3-trifluoropyruvates with amidines ? New trifluoromethyl substituted heterocyclic ?building blocks? Monatsh Chem 1993. [DOI: 10.1007/bf00816413] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
18
|
Schierlinger C, Gaa K, Geith K, Sewald N, Burger K. New synthetic pathways to trifluoromethyl substituted isoquinolines, hydroxyisoquinolines and cycloheptatrieno-[b] pyrroles. J Fluor Chem 1989. [DOI: 10.1016/s0022-1139(00)84518-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|