a toxin that is secreted by microorganisms into the surrounding medium
An exotoxin is a toxin secreted by bacteria. An exotoxin can cause damage to the host by destroying cells or disrupting normal cellular metabolism.
例句与用法
1.
Beta - exotoxin is an inhibitor of rna polymerase and acts competitively with atp in various biological processes 外毒素是rna聚合酶的抑制剂，在各个生化过程中与atp起竞争作用。
2.
The toxin may be formed within the pathogen and released when it dies ( endotoxin ) , or secreted through its cell wall ( exotoxin ) 在病原体内形成，当病原体裂解时被释放的毒素为内毒素；由病原体通过细胞壁向外分泌的毒素为外毒素。
3.
Translocation from endocytic compartments to the cytosol is the essential and rate - limiting step in the intoxication process of most toxins such as ricin , diphtheria toxin , shiga toxin and pseudomonas exotoxin ( pe ) . a number of these toxins are transported to trans - golgi network ( tgn ) , and in many cases such transport to the tgn is required for the translocation and cytotoxicity . in deed , 5 % of the ricin endocytosed by cells has been shown to reach the tgn 蓖麻毒素进入细胞的机理不甚明了，一般认为是rtb先与细胞膜受体结合，主要经过受体介导的内吞作用进入吞噬体，然后沿着内体、高尔基体、内质网等逆向分泌途径，有序地运输到内质网，最后从内质网转位进入细胞浆，在胞浆内攻击核糖体，从而抑制蛋白质的合成，导致细胞死亡。
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