光合细菌荚膜红杆菌E1F1对硝基酚的光依赖降解作用
Light-dependent degradation of nitrophenols by the phototrophic bacterium Rhodobacter capsulatus E1F1.
作者信息
Blasco R, Castillo F
机构信息
Departamento de Bioquímica, Biología Molecular y Fisiología, Facultad de Ciencias, Universidad de Córdoba, Spain.
出版信息
Appl Environ Microbiol. 1992 Feb;58(2):690-5. doi: 10.1128/aem.58.2.690-695.1992.
Abstract
Rhodobacter capsulatus E1F1, a phototrophic purple nonsulfur bacterium capable of photoassimilating nitrate or nitrite, grew phototrophically in the presence of mono- and dinitrophenols with acetate as a carbon source, the highest growth levels being obtained under microaerobic conditions. Utilization of 2,4-dinitrophenol was strictly light dependent, was inhibited by O2 and by ammonium, and took place with the simultaneous and stoichiometric production of 2-amino-4-nitrophenol, which accumulated in the medium and was poorly used for further growth in anaerobiosis. Metabolism of mononitrophenols was also light dependent but was activated by O2 and by ammonium. Metabolism of nitrophenols seemed to depend on inducible systems which were repressed in nitrogen-starved cells. Induction of the in vivo 2,4-dinitrophenol reducing system was strongly inhibited by chloramphenicol.
摘要
荚膜红细菌E1F1是一种能够光同化硝酸盐或亚硝酸盐的光合紫色非硫细菌，在单硝基酚和二硝基酚存在的情况下，以乙酸盐作为碳源进行光养生长，在微需氧条件下可达到最高生长水平。2,4-二硝基酚的利用严格依赖光照，受到氧气和铵的抑制，同时会以化学计量比产生2-氨基-4-硝基酚，该产物在培养基中积累，在厌氧条件下难以用于进一步生长。单硝基酚的代谢也依赖光照，但可被氧气和铵激活。硝基酚的代谢似乎依赖于诱导系统，该系统在氮饥饿细胞中受到抑制。氯霉素强烈抑制体内2,4-二硝基酚还原系统的诱导。
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