Írta: jefanaenly - Dátum: 02-12-2012 00:15
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Bactroban (generic name: mupirocin; brand names include: Centany) is an antibiotic.
Bactroban is used to treat certain skin infections such as impetigo and furuncle. It works by stopping the growth of bacteria.
There are 2 Bactroban products available: cream and nasal ointment. Both are supplied in 5 g tubes containing the active ingredient mupirocin calcium 2%.
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The mechanism of mupirocin differs from other clinical antibiotics, rendering cross-resistance to other antibiotics unlikely.[11] However, the MupA gene may co-transfer with other antibacterial resistance genes. This has been observed already with resistance genes for triclosan, tetracycline, and trimethoprim.[11] Post-PKS tailoring Mupirocin is bacteriostatic at low concentrations and bactericidal at high concentrations.[3] It is used topically and is effective against Gram-positive bacteria, including MRSA.[4] Mupirocin is a mixture of several pseudomonic acids, with pseudomonic acid A (PA-A) constituting greater than 90% of the mixture. Also present in mupirocin are pseudomonic acid B with an additional hydroxyl group at C8,[5] pseudomonic acid C with a double bond between C10 and C11, instead of the epoxide of PA-A,[6] and pseudomonic acid D with a double bond at C4` and C5` in the 9-hydroxy-nonanoic acid portion of mupirocin.[7] Clean and dry the affected area. Apply a small amount of the ointment as directed. Side effects other than those listed here may also occur. Talk to your doctor about any side effect that seems unusual or that is especially bothersome. You may report side effects to FDA at 1-800-FDA-1088. Monic acid biosynthesis Biosynthesis of Pseudomonic Acid A [edit]
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Watch for signs of improvement in 3 to 5 days. If your condition gets worse or does not improve, see your doctor. Pseudomonic acid A is the product of an esterification between the 17C polyketide monic acid and the 9C fatty acid 9-hydroxy-nonanoic acid. The possibility that the entire molecule is assembled as a single polyketide with a Baeyer-Villiger oxidation inserting an oxygen into the carbon backbone has been ruled out because C1 of monic acid and C9' of 9-hydroxy-nonanoic acid are both derived from C1 of acetate.[17] Bactroban is in the FDA pregnancy category B. This means that it is unlikely to harm an unborn baby. Do not use Bactroban without first talking to your doctor if you are pregnant. Mupirocin passes into breast milk and may affect a nursing infant. Do not use this medicine without first talking to your doctor if you are breast-feeding a baby. What should I avoid while using Bactroban? It is proposed that MmpB to catalyzes the synthesis of 9-HN (Figure 5). MmpB contains a KS, KR, DH, 3 ACPs, and a thioesterase (TE) domain.[15] It does not contain an enoyl reductase (ER) domain, which would be required for the complete reduction to the nine-carbon fatty acid. MupE is a single-domain protein that shows sequence similarity to known ER domains and may complete the reaction.[15] It also remains possible that 9-hydroxy-nonanoic acid is derived partially or entirely from outside of the mupirocin cluster.
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Resistance The nine-carbon fatty acid 9-hydroxy-nonanoic acid (9-HN) is derived as a separate compound and later esterified to monic acid to form pseudomonic acid. 13C labeled acetate feeding has shown that C1-C6 are constructed with acetate in the canonical fashion of fatty acid synthesis. C7' shows only C1 labeling of acetate, while C8' and C9' show a reversed pattern of 13C labeled acetate.[17] It is speculated that C7-C9 arises from a 3-hydroxypropionate starter unit, which is extended three times with malonyl-CoA and fully reduced to yield 9-HN. It has also been suggested that 9-HN is initiated by 3-hydroxy-3-methylglutaric acid (HMG). This latter theory was not supported by feeding of [3-14C] or [3,6-13C2]-HMG.[18] Assembly of monic acid is continued by the transfer of the 12C product of MmpD to MmpA.[15] Two more rounds of extension with malonyl-CoA units are achieved by module 5 and 6. Module 5 also contains a KR domain. Monic acid biosynthesis The keto group at C3 is replaced with a methyl group in a multi-step reaction (Figure 3). MupG begins by decarboxylating a malonyl-ACP. The alpha carbon of the resulting acetyl-ACP is linked to C3 of the polyketide chain by MupH. This intermediate is dehydrated and decarboxylated by MupJ and MupK, respectively.[15] Pseudomonic acid A is the product of an esterification between the 17C polyketide monic acid and the 9C fatty acid 9-hydroxy-nonanoic acid. The possibility that the entire molecule is assembled as a single polyketide with a Baeyer-Villiger oxidation inserting an oxygen into the carbon backbone has been ruled out because C1 of monic acid and C9' of 9-hydroxy-nonanoic acid are both derived from C1 of acetate.[17] The epoxide of PA-A at C10-11 is believed to be inserted after pyran formation by a cytochrome P450 such as MupO.[15] A gene knockout of mupO abolished PA-A production but PA-B, which also conatins the C10-C11 epoxide, remained.[16] This indicates that MupO is either not involved or is not essential for this epoxidation step.
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The keto group at C3 is replaced with a methyl group in a multi-step reaction (Figure 3). MupG begins by decarboxylating a malonyl-ACP. The alpha carbon of the resulting acetyl-ACP is linked to C3 of the polyketide chain by MupH. This intermediate is dehydrated and decarboxylated by MupJ and MupK, respectively.[15] Apply the missed dose as soon as you remember. However, if it is almost time for your next dose, skip the dose you missed and apply only the regular amount. Do not use a double dose of this medication unless otherwise directed by your doctor. What happens if I miss a dose?
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Wash your hands before and after using Bactroban. Most strains of Propionibacterium acnes, a causative agent of the skin disease acne vulgaris, are naturally resistant to mupirocin.[14] Do not use Bactroban if you have ever had an allergic reaction to mupirocin. Mupirocin (Bactroban or Centany) is an antibiotic of the monoxycarbolic acid class.[1] It was originally isolated from Pseudomonas fluorescens NCIMB 10586,[2] developed by Beecham. [edit] [edit] What happens if I miss a dose?