Trihydroxytoluene oxygenase

This reaction has also been observed in Pseudomonas [A2697], Sporotrichum [B124], Trichosporon [B368, D232], Arthrobacter [H270], Aspergillus [H236], Bradyrhizobium [J484] and Streptomyces [H347].

2,4,5-Trihydroxytoluene oxygenase

Burkholderia enzyme is apparently a dimmer; the molecular weight was found to be 67 000 or 78 000 by different methods. It contains two Fe/mol and is stimulated by Fe2+ and ascorbate. The product is 2,4-dihydroxy-5-methyl-cis, cis -muconic semialdehyde. Other catechols are also substrates [J903].

3-Methylcatechol 1,2-dioxygenase

3-Methylcatechol 0 2-methyl-cis, cis-muconate

This reaction has been observed with protocatechuate 3,4-dioxygenase (E.C. 1.13.11.3) from Hydrogenophaga palleroni [J218], catechol 1,2-dioxygenases (E.C. 1.13.11.1) from Pseudomonas, Alcaligenes eutrophus, Trichosporon cutaneum, Rhodococcus rhodochrous and R. erythropolis, as well as by activated sludge microorganisms [A3769, B754, C84, D247, E31, J703].

4-Methylcatechol 2,3-dioxygenase

4-Methylcatechol 0 2-hydroxy-5-methyl-cis, cis-muconic semialdehyde

Bacillus stearothermophilus catalyses this reaction [A2397], and many reports suggest that this reaction may be common in other microorganisms.

4-Methylcatechol 3,4-dioxygenase

4-Methylcatechol 0 3-methyl-cis, cis-muconate

This reaction has been observed with protocatechuate 3,4-dioxygenase from Hydrogenophaga palleronii [J218], and catechol 1,2-dioxygenases from Pseudomonas, Alcaligenes eutrophus, Trichosporon cutaneum, Rhizobium trifolii, Aspergillus niger, Candida tropicalis, Rhodococcus rhodochrous and R. erythropolis [A3769, B754, C84, C342, D247, D672, E204, G647, J703].

4-Methylcatechol 4,5-dioxygenase

4-Methylcatechol 0 2-hydroxy-4-methyl-cis, cis-muconic semialdehyde

Candida tropicalis catalyzes this reaction [A943], and many reports suggest that this reaction may be common in microorganisms.

3-Methylcatechol 2,3-dioxygenase

3-Methylcatechol 0 2-hydroxy-6-methyl-cis, cis-muconic semialdehyde

This reaction has been observed in several subspecies of Pseudomonas putida, in Burkholderia cepacia, Sphingomonas and Bacillus stearothermophilus, in activated sludge microorganisms [A2397, E31, J654, K5], as well as being catalysed by chlorocatechol 2,3-dioxygenase and 1,2-dihydroxynaphthalene oxygenase (see below).

2,3-Dihydroxybiphenyl 1,2-dioxygenase

Pseudomonas enzyme is an octamer, monomeric molecular weight 33 200. The product is 2-hydroxy-6-oxo-6-phenylhexa-2,4-dienoate. Catechol, 3- and 4-methylcatechol are poor substrates [G771]. P. pseudoalcaligenes and P. aeruginosa enzymes, molecular weights 250 000 and monomeric molecular weights 31 000, contain Fe2 + . They are specific for the 1,2-position of 2,3-dihydroxybiphenyl [E329].

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