Benzenetriol-Derived Compounds against Citrus Canker
Abstract
:1. Introduction
2. Results and Discussion
2.1. A Three-Step Synthesis Route from BTO to 4-Alkoxy-1,2-Benzenediols (Alkyl-BDOs)
2.2. Alkyl-BDOs Inhibit Bacterial Cell Growth
2.3. Alkyl-BDOs Have Bactericidal Activity
2.4. Alkyl-BDOs Permeabilize the Bacterial Cell Membrane
2.5. Alkyl-BDOs Remain Active against X. citri While in Solution
2.6. Alkyl-BDOs Cytotoxicity
3. Materials and Methods
3.1. Chemicals and Analytical Equipment
3.2. Synthesis, Purification, and Characterization of Alkyl-BDOs
3.3. Bacterial Strains and Standard Growth Conditions
3.4. Bacterial Growth Inhibition Assessment
3.5. Membrane Integrity Evaluation
3.6. Alkyl-BDOs Stability
3.7. Determination of the Cytotoxicity Index (IC50)
4. Conclusions
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
Sample Availability
Abbreviations:
alkyl-BDOs | 4-alkoxy-1,2-benzene diols |
BTO | 1,2,4-benzenetriol |
HMF | hydroxymethylfurfural |
DBU | 1,8-Diazabicyclo[5.4.0]undec-7-ene |
pBTO | Protected BTO; 2,2-dimethylbenzo[d][1,3]dioxol-5-ol |
p7-BDO | Protected intermediate; 2,2-dimethyl-5-(heptyloxy)benzo[d][1,3]dioxole |
4-BDO | 4-(butoxy)benzene-1,2-diol |
5-BDO | 4-(pentyloxy)benzene-1,2-diol |
6-BDO | 4-(hexyloxy)benzene-1,2-diol |
7-BDO | 4-(heptyloxy)benzene-1,2-diol |
8-BDO | 4-(octyloxy)benzene-1,2-diol |
9-BDO | 4-(nonyloxy)benzene-1,2-diol |
12-BDO | 4-(dodecyloxy)benzene-1,2-diol |
14-BDO | 4-(tetradecyloxy)benzene-1,2-diol |
X. citri | Xanthomonas citri subsp. citri |
B. subtilis | Bacillus subtilis |
E. coli | Escherichia coli |
L. lactis | Lactococcus lactis |
MICs | Minimum inhibitory concentrations |
MBC | Minimum bacteriostatic/Bactericidal concentration |
DMSO | Dimethyl sulfoxide |
NYG | Nitrogen–yeast–glycerol medium |
LB–Lennox | Lysogeny broth–Lennox medium |
IC50 | Cytotoxicity index |
EtOAc | Ethyl acetate |
NMR | Nuclear magnetic resonance |
HRMS | High-resolution mass spectrometry |
FTIR | Fourier-transform infrared spectroscopy |
OD600 | Optical density at 600 nm |
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Compound | R | MW | X. citri | B. subtilis | E. coli | L. lactis | |
---|---|---|---|---|---|---|---|
4-BDO | (CH2)3CH3 | 182.22 | 50 | >100 | >100 | 100 | |
alkyl-BDOs | 5-BDO | (CH2)4CH3 | 196.25 | 50 | 100 | >100 | 100 |
| 6-BDO | (CH2)5CH3 | 210.27 | 50 | 50 | >100 | 50 |
7-BDO | (CH2)6CH3 | 224.30 | 50 | 50 | >100 | 25 | |
8-BDO | (CH2)7CH3 | 238.33 | 100 | 50 | >100 | 25 | |
9-BDO | (CH2)8CH3 | 252.35 | >100 | 100 | >100 | 100 | |
12-BDO | (CH2)11CH3 | 294.44 | >100 | >100 | >100 | 100 | |
14-BDO | (CH2)13CH3 | 322.49 | >100 | >100 | >100 | >100 | |
Intermediates | |||||||
| pBTO | H | 166.18 | >100 | >100 | >100 | >100 |
p7-BDO | (CH2)6CH3 | 264.37 | >100 | >100 | >100 | >100 |
Treatment | X. citri | B. subtilis | ||
---|---|---|---|---|
Intact | Permeabilized | Intact | Permeabilized | |
p7-BDO | 69 | 31 | 94 | 6 |
7-BDO | 0 | 100 | 0 | 100 |
negative | 93 | 7 | 86 | 15 |
positive | 0 | 100 | 0 | 100 |
Compound | X. citri | B. subtilis | ||
---|---|---|---|---|
Pre-Incubation | No | 24 h | No | 24 h |
4-BDO | 50 | 50 | >100 | >100 |
5-BDO | 50 | 50 | 100 | >100 |
6-BDO | 50 | 50 | 50 | >100 |
7-BDO | 50 | 50 | 50 | >100 |
8-BDO | 100 | 100 | 50 | >100 |
9-BDO | >100 | >100 | 100 | >100 |
pBTO | >100 | >100 | >100 | >100 |
p7-BDO | >100 | >100 | >100 | >100 |
X. citri MIC/MBC | ||||
---|---|---|---|---|
Compound | NYG | NYG | LB–Lennox | LB–Lennox |
Pre-Incubation | No | 24 h | No | 24 h |
4-BDO | 50 | 50 | 50 | 100 |
5-BDO | 50 | 50 | 50 | 100 |
6-BDO | 50 | 50 | 50 | 100 |
7-BDO | 50 | 50 | 50 | >100 |
8-BDO | 100 | 100 | 100 | >100 |
9-BDO | 100 | 100 | 100 | >100 |
pBTO | >100 | >100 | >100 | >100 |
p7-BDO | >100 | >100 | >100 | >100 |
Compound | IC50 * | |
---|---|---|
MRC-5 | J774A.1 | |
6-BDO | 38.00 ± 4 | >100 |
7-BDO | 34.41 ± 4 | >100 |
8-BDO | 39.33 ± 5 | >100 |
doxorubicin | 8.7 | - |
Strain | Growth Conditions * |
---|---|
Xanthomonas citri subsp. citri 306 | NYGB (30 °C) |
Bacillus subtilis 168 | LB–Lennox (30 °C) |
Escherichia coli MG1655 | LB–Lennox (30 °C) |
Lactococcus lactis MG1363 | M17 + glucose 0.5% (30 °C) |
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Cavalca, L.B.; Lahive, C.W.; Gijsbers, F.; Pavan, F.R.; Scheffers, D.-J.; Deuss, P.J. Benzenetriol-Derived Compounds against Citrus Canker. Molecules 2021, 26, 1436. https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26051436
Cavalca LB, Lahive CW, Gijsbers F, Pavan FR, Scheffers D-J, Deuss PJ. Benzenetriol-Derived Compounds against Citrus Canker. Molecules. 2021; 26(5):1436. https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26051436
Chicago/Turabian StyleCavalca, Lúcia Bonci, Ciaran W. Lahive, Fleur Gijsbers, Fernando Rogério Pavan, Dirk-Jan Scheffers, and Peter J. Deuss. 2021. "Benzenetriol-Derived Compounds against Citrus Canker" Molecules 26, no. 5: 1436. https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26051436