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J Pept Res. 1999 Aug;54(2):137-45.

The solution structure of uperin 3.6, an antibiotic peptide from the granular dorsal glands of the Australian toadlet, Uperoleia mjobergii.

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Department of Chemistry, The University of Adelaide, South Australia, Australia.


Uperin 3.6 (GVIDA5AKKVV10NVLKN15LF-NH2) is a wide-spectrum antibiotic peptide isolated from the Australian toadlet, Uperoleia mjobergii. With only 17 amino acid residues, it is smaller than most other wide-spectrum antibiotic peptides isolated from amphibians. In 50% (by vol.) trifluoroethanol, an NMR study and structure calculations indicate that uperin 3.6 adopts a well-defined amphipathic alpha-helix with distinct hydrophilic and hydrophobic faces. Examination of the activities of synthetic modifications of uperin 3.6 reveal that the three lysine residues are essential for antibiotic activity.

[Indexed for MEDLINE]

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