Natural diversity of FAD-dependent 4-hydroxybenzoate hydroxylases.

4-Hydroxybenzoate 3-hydroxylase (PHBH) is the most extensively studied group A flavoprotein monooxygenase (FPMO). PHBH is almost exclusively found in prokaryotes, where its induction, usually as a consequence of lignin degradation, results in the regioselective formation of protocatechuate, one of the central intermediates in the global carbon cycle. In this contribution we introduce several less known FAD-dependent 4-hydroxybenzoate hydroxylases. Phylogenetic analysis showed that the enzymes discussed here reside in distinct clades of the group A FPMO family, indicating their separate divergence from a common ancestor. Protein homology modelling revealed that the fungal 4-hydroxybenzoate 3-hydroxylase PhhA is structurally related to phenol hydroxylase (PHHY) and 3-hydroxybenzoate 4-hydroxylase (3HB4H). 4-Hydroxybenzoate 1-hydroxylase (4HB1H) from yeast catalyzes an oxidative decarboxylation reaction and is structurally similar to 3-hydroxybenzoate 6-hydroxylase (3HB6H), salicylate hydroxylase (SALH) and 6-hydroxynicotinate 3-monooxygenase (6HNMO). Genome mining suggests that the 4HB1H activity is widespread in the fungal kingdom and might be responsible for the oxidative decarboxylation of vanillate, an import intermediate in lignin degradation. 4-Hydroxybenzoyl-CoA 1-hydroxylase (PhgA) catalyzes an intramolecular migration reaction (NIH shift) during the three-step conversion of 4-hydroxybenzoate to gentisate in certain Bacillus species. PhgA is phylogenetically related to 4-hydroxyphenylacetate 1-hydroxylase (4HPa1H). In summary, this paper shines light on the natural diversity of group A FPMOs that are involved in the aerobic microbial catabolism of 4-hydroxybenzoate.

• Publication year

  2021

• Venue

  Archives of Biochemistry and Biophysics

• Publication date

  2021-03-05

• Fields of study

  Biology, Medicine, Chemistry, Environmental Science

• Identifiers
  DOI 10.1016/j.abb.2021.108820PMID 33684360
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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