Dianthiamides A-E, Proline-Containing Orbitides from Dianthus chinensis
Jin Woo Lee1, Jun Gu Kim1, Jae Sang Han1
1College of Pharmacy, Chungbuk National University, Cheongju 28160, Korea.
Abstract:
Orbitides are plant-derived small cyclic peptides with a wide range of biological activities. Phytochemical investigation of the whole plants of Dianthus chinensis was performed with the aim to discover new bioactive orbitides. Five undescribed proline-containing orbitides, dianthiamides A-E (1-5), were isolated from a methanolic extract of Dianthus chinensis. Their structures were elucidated by extensive analysis of 1D and 2D NMR and HRESI-TOF-MS as well as ESI-MS/MS fragmentation data. The absolute configuration of the amino acid residues of compounds 1-5 was determined by Marfey's method. All compounds were tested for their cytotoxic activity, and dianthiamide A (1) exhibited weak activity against A549 cell line with IC50 value of 47.9 μM.
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