Synthesis and Membrane-Binding Properties of a Characteristic Lipopeptide from the Membrane-Anchoring Domain of Influenza Virus A Hemagglutinin
摘要:
On the trail of the influenza virus! Fluorescent-labeled lipopeptides, such as the characteristic S-palmitoylated partial structure from influenza virus hemagglutinin A, can be synthesized efficiently by employing a new enzymatic protecting-group technique in the key steps. Their binding to model membranes was determined in a kinetic assay, so leading to a first approximation of the membrane-anchoring ability of the corresponding lipopeptide motif in the parent protein.
Total synthesis of miraziridine A and identification of its major reaction site for cathepsin B
摘要:
The synthesis of miraziridine A, a pentapeptide derivative isolated from marine sponge, and its truncated analogs has been achieved. To construct the backbone of miraziridine A, a side-chain-unprotected vinylogous arginine was condensed with an aziridine-containing fragment prepared by a conventional solid-phase procedure. An analog lacking the vinylogous arginine site showed comparable inhibitory activity with miraziridine A, whereas an analog lacking the aziridine site showed remarkably weak inhibitory activity for cathepsin B. (C) 2007 Elsevier Ltd. All rights reserved.
Several analogues of the cytotoxic thiopeptide IB-01211 or mechercharmycin A (1) have been synthesized. The cytotoxicity of 1 and the synthesized analogues were evaluated against a panel of three human tumor cell lines. Thiopeptide 1 and the most active derivatives 2 and 3c were chosen for further studies on effects on cell cycle progression and induction of apoptosis. Interestingly, the inhibition of cell division and activation of a programmed cell death by apoptosis were detected.
Total synthesis of miraziridine A and identification of its major reaction site for cathepsin B
The synthesis of miraziridine A, a pentapeptide derivative isolated from marine sponge, and its truncated analogs has been achieved. To construct the backbone of miraziridine A, a side-chain-unprotected vinylogous arginine was condensed with an aziridine-containing fragment prepared by a conventional solid-phase procedure. An analog lacking the vinylogous arginine site showed comparable inhibitory activity with miraziridine A, whereas an analog lacking the aziridine site showed remarkably weak inhibitory activity for cathepsin B. (C) 2007 Elsevier Ltd. All rights reserved.
Synthesis and Membrane-Binding Properties of a Characteristic Lipopeptide from the Membrane-Anchoring Domain of Influenza Virus A Hemagglutinin
On the trail of the influenza virus! Fluorescent-labeled lipopeptides, such as the characteristic S-palmitoylated partial structure from influenza virus hemagglutinin A, can be synthesized efficiently by employing a new enzymatic protecting-group technique in the key steps. Their binding to model membranes was determined in a kinetic assay, so leading to a first approximation of the membrane-anchoring ability of the corresponding lipopeptide motif in the parent protein.