1274656-32-4Relevant academic research and scientific papers
Astins K-P, six new chlorinated cyclopentapeptides from Aster tataricus
Xu, Hui-Min,Zeng, Guang-Zhi,Zhou, Wen-Bing,He, Wen-Jun,Tan, Ning-Hua
, p. 7964 - 7969 (2013)
During further investigation on the methanol extract of roots and rhizomes of Aster tataricus, six new chlorinated cyclopentapeptides, designated as astins K-P (9-14), together with eight known derivatives, astins A-H (1-8), were isolated. Structures of the new cyclopeptides were established using extensive spectroscopic methods, and the absolute configurations were determined by the advanced Marfey's method. Astin P (14) represents a unique cyclopentapeptide linking as cyclo-(l-Pro (Cl2)1-l-allo-Thr 2-l-Ser3-l-β-Phe4-l-Ava5). Astin B (2) showed cytotoxicity against BGC-823 cell with IC50 value of 19.2 μg/ml. Astin C (3) exhibited cytotoxicity on HCT-116 and BGC-823 cells with IC50 values of 13.4 and 3.3 μg/ml, respectively.
Tataricins A and B, two novel cyclotetrapeptides from Aster tataricus, and their absolute configuration assignment
Xu, Hui-Min,Yi, Hua,Zhou, Wen-Bing,He, Wen-Jun,Zeng, Gang-Zhi,Xu, Wen-Yan,Tan, Ning-Hua
supporting information, p. 1380 - 1383 (2013/04/23)
Two novel cyclotetrapeptides, tataricins A and B, with a unique cyclopeptide backbone and aδ 2,4Pro side chain, were isolated from the traditional Chinese medicine Aster tataricus. Their structures and absolute configurations were determined using a combination of spectroscopic data, the advanced Marfey's method, and a total synthesis. Copyright
Cyclic depsipeptides, grassypeptolides D and e and Ibu- epidemethoxylyngbyastatin 3, from a Red Sea Leptolyngbya cyanobacterium
Thornburg, Christopher C.,Thimmaiah, Muralidhara,Shaala, Lamiaa A.,Hau, Andrew M.,Malmo, Jay M.,Ishmael, Jane E.,Youssef, Diaa T. A.,McPhail, Kerry L.
experimental part, p. 1677 - 1685 (2011/11/04)
Two new grassypeptolides and a lyngbyastatin analogue, together with the known dolastatin 12, have been isolated from field collections and laboratory cultures of the marine cyanobacterium Leptolyngbya sp. collected from the SS Thistlegorm shipwreck in the Red Sea. The overall stereostructures of grassypeptolides D (1) and E (2) and Ibu-epidemethoxylyngbyastatin 3 (3) were determined by a combination of 1D and 2D NMR experiments, MS analysis, Marfey's methodology, and HPLC-MS. Compounds 1 and 2 contain 2-methyl-3-aminobutyric acid and 2-aminobutyric acid, while biosynthetically distinct 3 contains 3-amino-2-methylhexanoic acid and the β-keto amino acid 4-amino-2,2-dimethyl-3-oxopentanoic acid (Ibu). Grassypeptolides D (1) and E (2) showed significant cytotoxicity to HeLa (IC50 = 335 and 192 nM, respectively) and mouse neuro-2a blastoma cells (IC50 = 599 and 407 nM, respectively), in contrast to Ibu-epidemethoxylyngbyastatin 3 (neuro-2a cells, IC50 > 10 μM) and dolastatin 12 (neuro-2a cells, IC 50 > 1 μM).
