violacein

Violacein is a bacterial metabolite originally isolated from C. violaceum that has antibacterial and antiprotozoal activities.[1] [2] It is produced by C. violaceum as a purple pigment in response to N-hexanoyl homoserine lactone , a property that has been modified to create a strain of C. violaceum used in detecting quorum-sensing molecules.[3] Violacein is active against Gram-positive bacteria, including B. subtilis and S. aureus (MICs = 0.8 and 1.6 µM, respectively). It is also active against P. falciparum, including chloroquine-susceptible and -resistant strains (IC50s = 0.85 and 0.63 µM, respectively).[2] It reduces parasitemia in a mouse model of nonlethal P. chabaudi chabaudi infection when administered at a dose of 7.5 mg/kg and increases survival in a mouse model of lethal P. chabaudi chabaudi infection. Violacein permeabilizes the cytoplasmic membrane of bacterial cells but does not affect the cell wall.[1]

N-Acetyltyramine 是一种群体感应抑制剂，由溶藻弧菌 M3-10 产生。N-Acetyltyramine 可以抑制C. violaceumATCC 12472 的群体感应。它可以逆转阿霉素耐药白血病 P388 细胞的耐药性。

Aculene D, 一种真菌代谢物，针对Chromobacterium violaceum CV026表现出群体感应(QS)抑制活性。该化合物能在亚抑制浓度下，显著削减由N-己酰基-l-高丝氨酸内酯(C6-HSL)触发的C. violaceum CV026培养物中紫罗兰素的产生。