Diketocamphane enantiomer-specific "Baeyer-Villiger" monooxygenases from camphor-grown Pseudomonas putida ATCC 17453
作者:K. H. Jones、R. T. Smith、P. W. Trudgill
DOI:10.1099/00221287-139-4-797
日期:1993.4.1
Pseudomonas putida ATCC 17453 grew with either (+)- or (−)-camphor as sole carbon source. Enantiomer-specific ‘biological Baeyer-Villiger’ monooxygenases were synthesized irrespective of the camphor isomer used for growth. The two enzymes are probably the products of separate genes but showed many similarities. Each consisted of two electrophoretically indentical subunits, bound flavin mononucleotide (FMN) non-covalently and accepted electrons from an induced NADH dehydrogenase which interacted with the FMN bound to the oxygenating component. They showed minor differences in M r with 3,6-diketocamphane 1,6-monooxygenase being the smaller enzyme. Isoelectric focussing showed the two enzymes to have different acidic pI values. Polyclonal antibodies raised against 3,6-diketocamphane 1,6-monooxygenase also cross-reacted with 2,5-diketocamphane 1,2-monooxygenase and its subunits.
假单胞菌ATCC 17453以(+)-或(-)樟脑作为唯一碳源生长。无论使用哪种樟脑异构体作为生长碳源,都能合成对映体特异的“生物拜耳-维利格”单加氧酶。这两种酶可能是不同基因的产物,但表现出许多相似性。它们都由两个电泳上相同的亚基组成,以非共价方式结合黄素单核苷酸(FMN),并从诱导的NADH脱氢酶接受电子,后者与结合到氧化组分上的FMN相互作用。它们在M r上表现出细微差异,其中3,6-二酮樟脑1,6-单加氧酶是较小的酶。等电聚焦显示两种酶具有不同的酸性pI值。针对3,6-二酮樟脑1,6-单加氧酶的多克隆抗体也与2,5-二酮樟脑1,2-单加氧酶及其亚基发生交叉反应。