Colistin Sodium Methanesulfonate is considered an inactive prodrug of colistin, which means it is inactive until converted into colistin by cellular enzymes. It is prepared by the reaction of colistin with formaldehyde, followed by sodium bisulfate. It is also less potent and less toxic than colistin sulfate and is effective against Gram-negative bacteria. Colistin works by targeting the bacterial cell membrane, leading to reduced permeability and cell death. The product is being explored with renewed interest as a possible anti-tuberculosis agent.
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Mechanism of Action | THe mechamism of action of Colistin Methanesulfonate has not been fully expllored, and has only been described from a histological and genomics perspective. Researchers used a GCxGC-TOFMS metabolomics approach and found that the prdouct acts by disrupting the cell wall of Mycobacteria. |
Spectrum | Colistin primarily targets and disrupts the cell wall of Gram negative bacteria and Mycobacteria. |
Microbiology Applications | Colistin is commonly used in clinical in vitro microbiological antimicrobial susceptibility tests (panels, discs, and MIC strips) against gram negative microbial isolates. Medical microbiologists use AST results to recommend antibiotic treatment options for infected patients. Representative MIC values include:
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Molecular Formula | C58H115N16Na5O28S5 |
References |
Asano T, Kageyama K and Myakumachi (1999) Surface disinfestation of resting spores of Plasmodiophora brassicae used to infect hairy roots of Brassica spp. Phytopathol. 89(4):314-319 PMID 18944777 Koen N, van Breda SV and Loots DT (2018) Metabolomics of colistin methanesulfonate treated Mycobacterium tuberculosis. Tuberculosis 111:154-160 PMID 30029902
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MIC | Cunninghamella bertholletiae (5633)| 16 - ?| 1101| Cunninghamella bertholletiae (6694)| 16 - ?| 1101| Cunninghamella bertholletiae (6733)| 32 - ?| 1101| Diplococcus pneumoniae| 400 - >400| 1413| Haemophilus influenzae| 0.4 - 0.8| 1413| Mucor circinelloides (4030)| 16 - ?| 1101| Mucor circinelloides (4480)| 16 - ?| 1101| Mucor circinelloides (4818)| 32 - ?| 1101| Mucor circinelloides (5904)| 16 - ?| 1101| Pseudomonas tabaci| 2 - ?| 1431| Rhizopus bertholletiae (6254)| 16 - ?| 1101| Rhizopus homothallicus (5790)| 16 - ?| 1101| Rhizopus homothallicus (5910)| 32 - ?| 1101| Rhizopus homothallicus (6360)| 32 - ?| 1101| Rhizopus microsporus (6164)| 32 - ?| 1101| Rhizopus oryzae (3140)| 16 - ?| 1101| Rhizopus oryzae (4153)| 16 - ?| 1101| Rhizopus oryzae (4549)| 32 - ?| 1101| Rhizopus oryzae (5496)| 16 - ?| 1101| Rhizopus oryzae (5799)| 8 - ?| 1101| Rhizopus oryzae (5879)| 32 - ?| 1101| Rhizopus oryzae (6093)| 16 - ?| 1101| Rhizopus oryzae (6725)| 16 - ?| 1101| Rhizopus sp. (4523)| 16 - ?| 1101| Treponema hyodysenteriae| >100 - ?| 1427| |