The Ability of -Conidendrin-decomposing Agrobacterium Strains to Utilize Other Lignans and Lignin-related Compounds

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Abstract
By the application of respirometric technics, it was found that the [alpha]-conidendrin (I)-decomposing agrobacteria included strains which were adaptively or constitutively lignanolytic. The lignans isotaxiresinol (V), iso-olivil (VI) and olivil (VII) were rapidly oxidized by all the bacteria examined. The adpative organisms showed a time-lag before oxidation of the lignans if they had been grown on a conidendrin-free medium. The lag required for oxygen uptake with [alpha]-conidendrin was shorter than that observed for the other lignans. Matairesinol (IV), which differs structurally from [alpha]-conidendrin through the lack of the "isolignan" bond was not attacked by any of the agrobacteria examined. Olivil and iso-olivil were oxidized identically, giving results which indicate that the organisms bring about the isomerization olivil[forward arrow] iso-olivil. [alpha]-Conidendrol (II) was indicated by the simultaneous adaptation to be an intermediate in [alpha]-conidendrin decomposition. All the bacteria studied possess a constitutive ability to oxidize aromatic aldehydes (vanillin, isovanillin, veratrum-aldehyde, syringaldehyde). By calculation from the total oxygen uptake, and by paper chromatography, it was found that these oxidations gave the corresponding acids. Simultaneously with oxidation to vanillic-acid, a small amount of vanillin was reduced to vanillyl-alcohol. Coniferyl-alcohol was oxidized to ferulic-acid.

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