Abstract
The lignin-degrading actinomycete Streptomyces viridosporus T7A readily degrades the lignin model compound dehydrodivanillin. Four mutants of this organism (produced by irradiation of spores with ultraviolet light) were shown to have lost the ability to catabolize dehydrodivanillin. These mutant strains retained an undiminished ability to degrade Douglas-fir lignin (14C-lignin → 14CO2) as compared to the wild-type strain. None of the strains accumulated detectable quantities of dehydrodivanillin when grown on lignocellulose. Thus it appears that the enzymes involved in dehydrodivanillin catabolism are not a part of the streptomycete's system for degrading polymeric lignin. It is concluded that dehydrodivanillin is probably not a relevant model compound for study of lignin polymer degradation by Streptomyces viridosporus. Since many stable mutants completely lacking DHDV-degrading ability were readily obtained, it is suggested that the relevant catabolic enzymes may be encoded on a plasmid.
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Abbreviations
- DHDV:
-
dehydrodivanillin
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Crawford, R.L., Crawford, D.L. & Dizikes, G.J. Catabolism of the lignin substructure model compound dehydrodivanillin by a lignin-degrading Streptomyces . Arch. Microbiol. 129, 204–209 (1981). https://doi.org/10.1007/BF00425251
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DOI: https://doi.org/10.1007/BF00425251