Enzyme-mediated nutrient release: glucose-precursor activation by β-galactosidase to induce bacterial growth
作者:Naama Karton-Lifshin、Uwe Vogel、Eran Sella、Peter H. Seeberger、Doron Shabat、Bernd Lepenies
DOI:10.1039/c3ob27385g
日期:——
Bacteria will gain an advantage if they are able to metabolize nutrients that are inaccessible for other bacteria. To demonstrate this principle, we developed a simple model system, which mimics how bacteria exploit natural carbon sources. A masked glucose precursor that is activated by β-galactosidase was used as a carbon source for bacterial growth in a glucose-deficient medium. No bacterial growth was observed in the presence of control substances in which β-galactosidase mediated cleavage did not lead to glucose release. This study represents a proof-of-principle example in which a bacterium can grow in a nutrient-free medium by inducible, enzyme-mediated nutrient release from a precursor.
如果细菌能够代谢其他细菌无法获得的营养物质,它们就会获得优势。为了证明这一原理,我们开发了一个简单的模型系统,模拟细菌如何利用天然碳源。在缺乏葡萄糖的培养基中,一种被δ-半乳糖苷酶激活的葡萄糖前体被用作细菌生长的碳源。在δ-半乳糖苷酶介导的裂解不导致葡萄糖释放的对照物质存在时,没有观察到细菌生长。这项研究提供了一个原理验证实例,即细菌可以通过诱导、酶介导的前体营养释放在无营养培养基中生长。