Novel chromogenic aminopeptidase substrates for the detection and identification of clinically important microorganisms
作者:Marie Cellier、Arthur L. James、Sylvain Orenga、John D. Perry、Ari K. Rasul、Shaun N. Robinson、Stephen P. Stanforth
DOI:10.1016/j.bmc.2014.08.004
日期:2014.10
A series of amino acid derivatives 8–10, 42 and 43 have been prepared as chromogenic enzyme substrates in order to detect aminopeptidase activity in clinically important Gram-negative and Gram-positive bacteria. Enzymatic hydrolysis liberates the amino acid moiety and either a 4-aminophenol or a 4-dialkylaminoaniline derivative which undergoes oxidative coupling with 1-naphthol or a substituted 1-naphthol
一系列氨基酸衍生物的8 - 10,42和43已制备为显色酶底物以检测在临床上重要的革兰氏阴性和革兰氏阳性细菌氨肽酶活性。酶促水解释放氨基酸部分和4-氨基苯酚或4-二烷基氨基苯胺衍生物,该衍生物与1-萘酚或取代的1-萘酚进行氧化偶联,得到吲哚酚染料。将底物和1-萘酚掺入基于琼脂的培养基中,这使得基于特定酶的水解,可以使强烈着色的细菌菌落生长。底物8 – 10产生红色/粉红色的菌落基板42和43形成蓝色和蓝色的菌落。该升丙氨酰肽酶底物8针对性升丙氨酰肽酶的活性,给有色菌落各种革兰阴性菌。底物9靶向β-丙氨酰氨肽酶活性,并产生带有选定革兰氏阴性菌种(包括铜绿假单胞菌)的有色菌落。肠球菌和化脓性链球菌水解了3 - p-谷氨酰胺酸氨基肽酶的三种底物(10a,10c和43)产生有色菌落。该研究中还包括了两种酵母,但是它们没有与任何受检底物产生有色菌落。