Abstract
In the soil bacterium ( Pseudomonas paucimobilis SYK-6), the metabolism of DDVA (biphenyl structure of lignin) and syringic acid (characteristic aromatic ring in hardwood lignin) proceeds via a common intermediate, 3-methylgallic acid. Protocatechuate is also an intermediate in the metabolism of vanillate and p-hydroxybenzoic acid. 3-Methylgallic acid and protocatechuate are the final aromatic intermediates in lignin microbial degradation and these compounds are substrates of protocatechuate-4,5-dioxygenase, which is a key enzyme in obtaining metabolic energy from various structures of lignin in this bacterium.
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