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IUBMB Comments Catalyses hydrogen transfer from C3 or C4 (S )-2-hydroxy acids to 2-oxo acids. It contains tightly bound nicotinamide nucleotide in its active centre. This prosthetic group cannot be removed without denaturation of the protein.
The expected taxonomic range for this enzyme is: Veillonella parvula
Synonyms malate-lactate transhydrogenase, more
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malate-lactate transhydrogenase
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transhydrogenase, lactate-malate
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(S)-lactate + oxaloacetate = pyruvate + malate
(S)-lactate + oxaloacetate = pyruvate + malate
mechanism
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(S)-lactate + oxaloacetate = pyruvate + malate
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(S)-lactate:oxaloacetate oxidoreductase
Catalyses hydrogen transfer from C3 or C4 (S)-2-hydroxy acids to 2-oxo acids. It contains tightly bound nicotinamide nucleotide in its active centre. This prosthetic group cannot be removed without denaturation of the protein.
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(S)-lactate + oxaloacetate
malate + pyruvate
pyruvate + L-malate
(S)-lactate + oxaloacetate
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Substrates: - Products: -
r
(S)-lactate + oxaloacetate
malate + pyruvate
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Substrates: - Products: -
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(S)-lactate + oxaloacetate
malate + pyruvate
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Substrates: - Products: -
r
(S)-lactate + oxaloacetate
malate + pyruvate
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Substrates: catalyzes hydrogen transfer from C3 or C4(S)-2-hydroxy acids to 2-oxo-acids, hydrogen donors: L-malate, DL-lactate and DL-alpha-hydroxybutyrate, low activity with: DL-alpha-hydroxyglutarate, DL-alpha-hydroxyvalerate, DL-beta-hydroxybutyrate and DL-alpha-hydroxycaprylate, hydrogen acceptors: oxalacetate, low activity with: alpha-ketoglutarate, alpha-ketocaprylate Products: -
r
(S)-lactate + oxaloacetate
malate + pyruvate
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Substrates: keto-tautomer is the enzymatically active form of oxalacetate Products: -
r
(S)-lactate + oxaloacetate
malate + pyruvate
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Substrates: 50% higher specific activity with malate and pyruvate as substrates Products: -
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(S)-lactate + oxaloacetate
malate + pyruvate
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Substrates: first step in fermentation of lactate Products: -
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(S)-lactate + oxaloacetate
malate + pyruvate
(S)-lactate + oxaloacetate
malate + pyruvate
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Substrates: - Products: -
r
(S)-lactate + oxaloacetate
malate + pyruvate
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Substrates: first step in fermentation of lactate Products: -
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NAD+
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prosthetic group
NAD+
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tightly bound in the active centre
NAD+
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NAD+/NADH equivalent binding weight is 35000 Da
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additional information
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no metal ion required
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p-hydroxymercuribenzoate
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additional information
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non-specific inhibition by high ionic strength
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6.3 - 9.5
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about 50% of maximal activity at pH 6.3 and 9.5
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no activity in Escherichia coli
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no activity in Propionibacterium shermanii
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formerly named as Micrococcus lactilyticus
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30000
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3 (or 4) * 30000, sucrose gradient centrifugation of succinylated and urea solubilized enzyme
99000 - 100000
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sucrose density gradient studies
70000
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70000
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sedimentation-diffusion and high-speed equilibrium methods
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dimer
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2 * 30000-43000, SDS-PAGE
trimer or tetramer
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3 (or 4) * 30000, sucrose gradient centrifugation of succinylated and urea solubilized enzyme
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-15°C, as ammonium sulfate suspension, about 10-20 mg of protein per ml, 40% loss of activity after 1 year
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DEAE-cellulose, DEAE-Sephadex
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Allen, S.H.G.
The isolation and characterization of malate-lactate transhydrogenase from Micrococcus lactilyticus
J. Biol. Chem.
241
5266-5275
1966
no activity in Escherichia coli, no activity in Propionibacterium shermanii, Veillonella parvula
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Allen, S.H.G.
Malate-lactate transhydrogenase from Micrococcus lactilyticus
Methods Enzymol.
13
262-269
1969
Veillonella parvula
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brenda
Allen, S.H.G.; Patil, J.R.
Studies on the structure and mechanism of action of the malate-lactate transhydrogenase
J. Biol. Chem.
247
909-916
1972
Veillonella parvula
brenda
Allen, S.H.G.
Molecular weight and subunit structure of the malate-lactate transhydrogenase
Eur. J. Biochem.
35
338-345
1973
Veillonella parvula
brenda
Allen, S.H.G.
Lactate-oxaloacetate transhydrogenase from Veillonella alcalescens
Methods Enzymol.
89
367-376
1982
Veillonella parvula
brenda
Dolin, M.I.
Kinetics of malic-lactic transhydrogenase. Abortive complex formation with substrates and products
J. Biol. Chem.
244
5273-5285
1969
Veillonella parvula
brenda
Dolin, M.I.
Kinetics of malic-lactic transhydrogenase. Effect of the keto-enol tautomerism of oxalacetate on the kinetics of oxalacetate formation and utilization
J. Biol. Chem.
243
3916-3923
1968
Veillonella parvula
brenda
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