许多微生物具有一种特殊的能力,即能够通过改造和利用他们自身存在的 DNA 来构建新的代谢途径。调节突变作用允许具有无偿催化新底物的酶的脱抑制或合成。一些没有被亲株菌表达和利用的沉默基因或隐蔽基因,通常在建立新的代谢途径时,得以启动并催化一定的反应。在生物技术的一些新方法产生后所引起的兴奋之余,往往会忽视掉一点:有一些微生物具有非凡的功能,能使用它们自身存在 Many microorganisms have a special ability to build new metabolic pathways by altering and using their own DNA. Modulating the mutation allows deprotection or synthesis of an enzyme with a new substrate that gratuitously catalyzes. Silencing genes or cryptic genes that are not expressed and utilized by the parental bacteria usually start and catalyze reactions when new metabolic pathways are established. In addition to the excitement afforded by some new biotechnological methods, one often overlooks the fact that some microbes have an extraordinary ability to use their own