Structure of Subtilosin A, an Antimicrobial Peptide from <i>Bacillus </i><i>s</i><i>ubtilis</i> with Unusual Posttranslational Modifications Linking Cysteine Sulfurs to α-Carbons of Phenylalanine and Threonine
作者:Karen Kawulka、Tara Sprules、Ryan T. McKay、Pascal Mercier、Christopher M. Diaper、Peter Zuber、John C. Vederas
DOI:10.1021/ja029654t
日期:2003.4.1
subtilosin A (1), a bacteriocin from Bacillus subtilis, were determined by multidimensional NMR studies on peptide produced using isotopically labeled [(13)C,(15)N]medium derivedfrom Anabaena sp. grown on sodium [(13)C]bicarbonate and [(15)N]nitrate. Additional samples of 1 were also generated by separate incorporations of [U-(13)C,(15)N]phenylalanine and [U-(13)C,(15)N]threonine using otherwise unlabeled
A NaCl-mediated electrochemical oxidation of amino acid carbamates (R1 = Boc, Cbz) afforded α-methoxylated α-amino acids. Subsequent acid-catalyzed elimination delivered valuable dehydroaminoacidderivatives. The simplicity of our setup using graphite-electrodes was showcased, producing N-Boc-ΔAla-OMe on a decagram scale.