RA-dimerâ
B, a New Dimeric RA-series Cyclopeptide Incorporating Two Different Types of Cycloisodityrosine Units, from Rubia cordifoliaâ
L.
Chem Asian J
; 11(23): 3389-3397, 2016 Dec 06.
Article
em En
| MEDLINE
| ID: mdl-27863076
ABSTRACT
RA-dimerâ
B, a new cytotoxic RA-series peptide, was isolated from the roots of Rubia cordifoliaâ
L. Its structure was elucidated on the basis of spectroscopic analysis to be a dimeric cyclopeptide composed of deoxybouvardin and allo-RA-V. Those two cyclopeptide units are connected by an ether linkage between the phenolic oxygen atom of deoxybouvardin and the ϵa carbon atom of Tyr-6 of allo-RA-V. RA-dimerâ
B was synthesized by the coupling reaction of deoxybouvardin with the boronic acid derivative of allo-RA-V, and subsequent deprotection, confirming the relative stereochemistry and establishing the absolute configuration of this peptide. RA-dimerâ
B showed cytotoxic activity against human promyelocytic leukaemia HL-60, human colonic carcinoma HCT-116, and human renal cell carcinoma ACHN cells with IC50 values of 0.59, 0.54, and 0.74â
µm, respectively.
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Base de dados:
MEDLINE
Assunto principal:
Peptídeos Cíclicos
/
Rubia
Idioma:
En
Ano de publicação:
2016
Tipo de documento:
Article