Abstract
Subtilosin A produced by Bacillus subtilis is a macrocyclic peptide antibiotic which comprises 35 amino acids. Its molecular mass (3399.7 Da), determined by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry, and chemical properties gave experimental support for unusual intramolecular linkages. The three-dimensional fold of native subtilosin in dimethylsulfoxide was determined from two-dimensional 1H-NMR spectra recorded at 600 MHz. Based on the backbone conformation, a structure for subtilosin A is presented which is characterized by three inter-residue bridges where two cysteines are linked with two phenylalanine residues, respectively, and a third cysteine is bound to a threonine residue.
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Marx, R., Stein, T., Entian, KD. et al. Structure of the Bacillus subtilis Peptide Antibiotic Subtilosin A Determined by 1H-NMR and Matrix Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry. J Protein Chem 20, 501–506 (2001). https://doi.org/10.1023/A:1012562631268
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DOI: https://doi.org/10.1023/A:1012562631268