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Fine structure of the gene of 6-aminohexanoic acid cyclic dimer hydrolase, one of the enzymes responsible for the degradation of the nylon oligomer (6-aminohexanoic acid cyclic dimer), on the plasmid pOAD2 harbored in Flavobacterium sp. KI72 was determined by constructing miniplasmids from plasmid pNDH5 (a hybrid plasmid consisting of pBR322 and a 9.1-kilobase-pair HindIII fragment of pOAD2 ). The 6-aminohexanoic acid cyclic dimer hydrolase produced by cells of Escherichia coli C600 harboring pNDH5 or its miniplasmid was examined immunologically and electrophoretically and was found to be identical to that of Flavobacterium sp. KI72 . A fragment of pOAD2 (17.2- to 19.1-kilobase-pair region on pOAD2 ) was detected as hybridized fragment by Southern blotting experiments, indicating the presence of the DNA region analogous to the 6-aminohexanoic acid cyclic dimer hydrolase gene on the plasmid.
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