Three pairs of variecolortide enantiomers from Eurotium sp with caspase-3 inhibitory activity

Three pairs of variecolortide enantiomers from Eurotium sp with caspase-3 inhibitory activity
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来自散囊菌的三对具有 caspase-3 抑制活性的杂色肽对映体

DOI:
10.1016/j.fitote.2013.11.012
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发表时间:
2014-01-01
期刊:
影响因子:
3.4
通讯作者:
Gao, Hao
Gao, Hao
中科院分区:
医学3区
文献类型:
--
作者:
Chen, Guo-Dong;Bao, Yan-Ru;Gao, Hao

文献摘要

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7-O-甲基杂色色素A(1)、杂色色素B(2)和杂色色素C(3)是从内生真菌Eurotium sp.(No.17 -11-8-1)中分离得到的以外消旋形式存在的稀有杂色色素。采用手性HPLC技术,成功分离得到(-)-(S)-7-O-甲基杂色色素肽A(1a)、(+)-(R)-7-O-甲基杂色色素肽A(1 B)、(-)-(S)-杂色色素肽B(2a)、(+)-(R)-杂色色素肽B(2 B)、(-)-(S)-杂色色素肽C(3a)和(+)-(R)-杂色色素肽C(3B)。通过ECD实验和ECD计算首次确定了它们的绝对构型。根据化合物间的相互关系,提出了一条可能的生物合成途径。在半胱天冬酶-3的酶活性测定中,化合物1-3显示出抑制活性,其IC 50值分别为1.7、0.8和15.7 μ M。(C)2013爱思唯尔有限公司版权所有。
7-O-methylvariecolortide A (1), variecolortide B (2), and variecolortide C (3), the rare variecolortides existing in racemic manner, were isolated from an endolichenic fungal strain Eurotium sp. (No. 17-11-8-1). With the chiral HPLC technology, (-)-(S)-7-O-methylvariecolortide A (1a), (+)-(R)-7-O-methylvariecolortide A (1b), (-)-(S)-variecolortide B (2a), (+)-(R)-variecolortide B (2b), (-)-(S)-variecolortide C (3a), and (+)-(R)-variecolortide C (3b) were successfully separated and obtained. Their absolute configurations were firstly assigned by ECD experiment and ECD calculation. According to the relation of isolated compounds, a plausible biosynthetic pathway for variecolortides was proposed. In caspase-3 enzymatic assay, compounds 1-3 showed inhibitory activity, with IC50 values of 1.7, 0.8 and 15.7 mu M, respectively. (C) 2013 Elsevier B.V. All rights reserved.