aurachins includes the intriguing migration of the prenyl group by a pinacol‐type rearrangement. In vitro analysis of AuaGH revealed that these enzymes catalyze epoxidation coupled with semipinacolrearrangement (see scheme) and ketoreduction. Thus, the AuaGH system was revealed to be a novel enzymatic system for establishing semipinacolrearrangements.
A one-step synthesis of the rare aurachin E (1) from the easily accessible aurachin C (2) and cyanogen bromide is described. 3-Bromocarbamoylquinoline (5) is formed in a side reaction with concomitant loss of the 3-farnesyl residue. In an alternative approach, aurachin D (3) was reacted with phosgene and sodium azide to form the imidazolone ring of 1 via N-acylation. Unexpectedly, the initial reaction occurred at the carbonyl group of 3 to give 1H-pyrrolo[3,2-c]quinoline 4. The reaction sequence represents a novel route to this type of compound. Aurachin E, contrary to other aurachins, combines a high in vitro antiplasmodial activity with low cytotoxicity and absence of mitochondrial respiratory inhibition.
COMPOSITIONS AND METHODS TO BOOST ENDOGENOUS ROS PRODUCTION FROM BACTERIA
申请人:Trustees of Boston University
公开号:US20150071904A1
公开(公告)日:2015-03-12
Provided herein are compositions and methods comprising ROS target modulators that increase ROS flux and endogenus ROS production, thereby potentiating oxidative attack by antibiotics and biocides.
Biosynthesis of Aurachins A−L in <i>Stigmatella aurantiaca</i>: A Feeding Study
作者:Gerhard Höfle、Brigitte Kunze
DOI:10.1021/np8003084
日期:2008.12.1
quinolines carrying a farnesyl residue on C-4, C-type aurachins (3, 4, 7-11) are C-4 oxygen-substituted quinolines carrying a farnesyl residue on C-3, and C-type aurachin E (5) has a [1,1a,8,d]imidazoloquinoline structure. Feeding of (13)C-labeled precursors showed that the quinoline ring is constructed from anthranilic acid and acetate, and the farnesyl residue from acetate by both the mevalonate