Microorganisms capable of degrading methylpyrazines were enriched from soil using 2,5-dimethylpyrazine or 2,3,5,6-tetramethylpyrazine as a sole carbon source. Based on the comparison of 16S rRNA gene sequences, 2,5-dimethylpyrazine-degrading bacteria 25DMP1 and 25DOT1 were presumed to belong to two distinct species of Arthrobacter genus. 2,5-Dimethylpyrazine-induced intact cells of 25DMP1 and 25DOT1 strains were capable to transform both 2,3-dimethylpyrazine and 2,3,5-trimethylpyrazine. Two isolates capable to aerobically utilize pyridine and 2,3,5,6-tetramethylpyrazine were identified as Rhodococcus jostii TMP1 and Rhodococcus wratislaviensis TMP2, respectively. 2,3,5,6-tetramethylpyrazine-induced cells of TMP1 strain transformed a wide range of methylated pyrazines and pyridines. The resting cells of Rhodococcus jostii TMP1 could be applicable for the synthesis of hydroxypyridines such as 2,4,6-trimethylpyridin-3-ol under the mild conditions.

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