Takenaka Shinji, Okugawa Susumu, Kadowaki Maho, Murakami Shuichiro, Aoki Kenji
Department of Biofunctional Chemistry, Faculty of Agriculture, Kobe University, Rokko, Kobe, Japan.
Appl Environ Microbiol. 2003 Sep;69(9):5410-3. doi: 10.1128/AEM.69.9.5410-5413.2003.
Burkholderia sp. strain AK-5 utilized 4-aminophenol as the sole carbon, nitrogen, and energy source. A pathway for the metabolism of 4-aminophenol in strain AK-5 was proposed based on the identification of three key metabolites by gas chromatography-mass spectrometry analysis. Strain AK-5 converted 4-aminophenol to 1,2,4-trihydroxybenzene via 1,4-benzenediol. 1,2,4-Trihydroxybenzene 1,2-dioxygenase cleaved the benzene ring of 1,2,4-trihydroxybenzene to form maleylacetic acid. The enzyme showed a high dioxygenase activity only for 1,2,4-trihydroxybenzene, with K(m) and V(max) values of 9.6 micro M and 6.8 micro mol min(-1) mg of protein(-1), respectively.
伯克霍尔德氏菌属菌株AK-5利用4-氨基苯酚作为唯一的碳、氮和能源。基于气相色谱-质谱分析鉴定出的三种关键代谢物,提出了菌株AK-5中4-氨基苯酚的代谢途径。菌株AK-5通过1,4-苯二酚将4-氨基苯酚转化为1,2,4-三羟基苯。1,2,4-三羟基苯1,2-双加氧酶裂解1,2,4-三羟基苯的苯环形成马来酰乙酸。该酶仅对1,2,4-三羟基苯表现出高双加氧酶活性,其米氏常数(K(m))和最大反应速度(V(max))值分别为9.6微摩尔和6.8微摩尔每分钟每毫克蛋白质。