Author/Authors :
Michail M. Yakimov، نويسنده , , Wolf-Rainer Abraham، نويسنده , , Holger Meyer، نويسنده , , Laura Giuliano، نويسنده , , Peter N. Golyshin، نويسنده ,
Latin Abstract :
The structural characterization of the cyclic lipoheptapeptide surfactant lichenysin A components, produced by Bacillus licheniformis strains via the non-ribosomal pathway on a corresponding peptide synthetase, was carried out using a tandem mass spectrometry (MS/MS) under fast atom bombardment (FAB) conditions. Based on the analysis of the collision-induced fragment-ion spectrum of the single charged molecular ions of both native and partially hydrolyzed forms of lipopeptide, a new general structure of lichenysin A components was elucidated. It varies from previously proposed structure by having in the peptide portion of lipopeptide the -Gln-1 and -Asp-5 residues instead of -Glu-1 and -Asn-5. The verified chemical structure of lichenysin A was found to be reflected in the structural organization of the corresponding lichenysin A synthetase, LchA, described recently.
