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EC 4.3.99.2 Details

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EC number

4.3.99.2

Accepted name

carboxybiotin decarboxylase

Reaction

a carboxybiotinyl-[protein] + n Na⁺_in + H⁺_out = CO₂ + a biotinyl-[protein] + n Na⁺_out (n = 1–2)

Other name(s)

MadB, carboxybiotin protein decarboxylase

Systematic name

carboxybiotinyl-[protein] carboxy-lyase

Comment

The integral membrane protein MadB from the anaerobic bacterium Malonomonas rubra is a component of the multienzyme complex EC 4.1.1.89, biotin-dependent malonate decarboxylase. The free energy of the decarboxylation reaction is used to pump Na⁺ out of the cell. The enzyme is a member of the Na⁺-translocating decarboxylase family, other members of which include EC 4.1.1.3 (oxaloacetate decarboxylase) and EC 4.1.1.41 (methylmalonyl-CoA decarboxylase) [2].

History

created 2008, deleted 2018

EC Tree

1 Oxidoreductases

1.1 Acting on the CH-OH group of donors

1.2 Acting on the aldehyde or oxo group of donors

1.3 Acting on the CH-CH group of donors

1.4 Acting on the CH-NH₂ group of donors

1.5 Acting on the CH-NH group of donors

1.6 Acting on NADH or NADPH

1.7 Acting on other nitrogenous compounds as donors

1.8 Acting on a sulfur group of donors

1.9 Acting on a heme group of donors

1.10 Acting on diphenols and related substances as donors

1.11 Acting on a peroxide as acceptor

1.12 Acting on hydrogen as donor

1.12.1 With NAD⁺ or NADP⁺ as acceptor

1.12.2 With a cytochrome as acceptor

1.12.5 With a quinone or similar compound as acceptor

1.12.7 With an iron-sulfur protein as acceptor

1.12.98 With other, known, physiological acceptors

1.12.99 With unknown physiological acceptors

1.13 Acting on single donors with incorporation of molecular oxygen (oxygenases)

1.14 Acting on paired donors, with incorporation or reduction of molecular oxygen

1.15 Acting on superoxide as acceptor

1.16 Oxidizing metal ions

1.17 Acting on CH or CH₂ groups

1.17.1 With NAD⁺ or NADP⁺ as acceptor

1.17.2 With a cytochrome as acceptor

1.17.3 With oxygen as acceptor

1.17.4 With a disulfide as acceptor

1.17.5 With a quinone or similar compound as acceptor

1.17.7 With an iron-sulfur protein as acceptor

1.17.7.1 (E)-4-hydroxy-3-methylbut-2-enyl-diphosphate synthase (ferredoxin)

1.17.7.2 7-hydroxymethyl chlorophyll a reductase

1.17.7.3 (E)-4-hydroxy-3-methylbut-2-enyl-diphosphate synthase (flavodoxin)

1.17.7.4 4-hydroxy-3-methylbut-2-en-1-yl diphosphate reductase

1.17.8 With a flavin as acceptor

1.17.9 With a copper protein as acceptor

1.17.98 With other, known, physiological acceptors

1.17.99 With unknown physiological acceptors

1.18 Acting on iron-sulfur proteins as donors

1.19 Acting on reduced flavodoxin as donor

1.20 Acting on phosphorus or arsenic in donors

1.21 Catalysing the reaction X-H + Y-H = X-Y

1.21.1 With NAD⁺ or NADP⁺ as acceptor

1.21.3 With oxygen as acceptor

1.21.4 With a disulfide as acceptor

1.21.98 With other, known, physiological acceptors

1.21.99 With unknown physiological acceptors

1.22 Acting on halogen in donors

1.23 Reducing C-O-C group as acceptor

1.97 Other oxidoreductases

1.98 Enzymes using H₂ as reductant (deleted subclass)

1.99 Other enzymes using O₂ as oxidant (deleted subclass)

2 Transferases

2.1 Transferring one-carbon groups

2.2 Transferring aldehyde or ketonic groups

2.3 Acyltransferases

2.4 Glycosyltransferases

2.5 Transferring alkyl or aryl groups, other than methyl groups

2.6 Transferring nitrogenous groups

2.7 Transferring phosphorus-containing groups

2.8 Transferring sulfur-containing groups

2.9 Transferring selenium-containing groups

2.10 Transferring molybdenum- or tungsten-containing groups