Modification and inhibition of vancomycin group antibiotics by formaldehyde and acetaldehyde
UNSPECIFIED (2001) Modification and inhibition of vancomycin group antibiotics by formaldehyde and acetaldehyde. CHEMISTRY-A EUROPEAN JOURNAL, 7 (4). pp. 910-916. ISSN 0947-6539Full text not available from this repository.
It is shown that several vancomycin group antibiotics (vancomycin, eremomycin, and avoparcin) undergo spontaneous chemical modifications when kept at room temperature at neutral pH in aqueous solutions containing traces of formaldehyde or acetaldehyde. This chemical modification predominantly results in a mass increase of 12 Da in the reaction with formaldehyde and 26 Da in the case of acetaldehyde. By using tandem mass spectrometry the modification can unambiguously be identified as originating from the formation of a ring-closed 4-imidazolidinone moiety at the N-terminus of the glycopeptide antibiotics, that is, near the receptor binding pocket of the glycopeptide antibiotics. Bioaffinity mass spectrometry shows that this ring-closure results in a dramatically decreased affinity for the peptidoglycan-mimicking D-alanyl-D-alanine receptor. Additionally in vitro inhibition measurements on two different strains of bacteria have revealed that the modified antibiotics display reduced antibacterial activity. The ring-closure is also shown to have a dissociative effect on the dimerization of the vancomycin-analogue eremomycin. The spontaneous reaction of vancomycin with formaldehyde or acetaldehyde may have implications not only for the clinical use of this class of antibiotics, but also for the effectiveness of these antibiotics when they are used in chiral separation chromatography or capillary electrophoresis.
|Item Type:||Journal Article|
|Subjects:||Q Science > QD Chemistry|
|Journal or Publication Title:||CHEMISTRY-A EUROPEAN JOURNAL|
|Publisher:||WILEY-V C H VERLAG GMBH|
|Date:||16 February 2001|
|Number of Pages:||7|
|Page Range:||pp. 910-916|
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