JOURNAL ARTICLE

Structural characterization of lipopeptides from Brevibacillus brevis HOB1

Ji Wang, Namir I A Haddad, Shi-Zhong Yang, Bo-Zhong Mu
Applied Biochemistry and Biotechnology 2010, 160 (3): 812-21
19224401
Brevibacillus brevis HOB1 was isolated from the formation water of an oil field and found to produce lipopeptides. The separation of lipopeptides was successfully achieved by reversed-phase high-performance liquid chromatography (HPLC) leading to nine separated peaks. The chemical structures of these lipopeptides were studied by means of electrospray ionization mass spectrometry (ESI-MS), gas chromatography-mass spectrometry (GC/MS), HPLC and electrospray ionization tandem mass spectrometry (ESI-MS/MS). As the results, all the lipopeptides had peptide parts with the same amino acid composition of Asp, Glu, Val, and Leu in the molar ratio 1:1:1:4, while the lipid part was composed of C(13)-C(15) beta-hydroxy fatty acids. As the sequence of fraction 1 was determined to be N-Glu-Leu-Leu-Val-Asp-Leu-Leu-C, the same as surfactin, they were proposed to be surfactin isoforms. Fraction 4 (C(15) surfactin) exhibited a good surface activity of 26.8 mN/m with CMC of 9 x 10(-6 )M. Surfactin is a powerful biosurfactant possessing biological activities. As far as we know, Br. brevis is a new surfactin-producing species.

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