MetaCyc Enzyme: S-sulfolactate dehydrogenase

Gene: slcC Accession Number: G-12189 (MetaCyc)

Synonyms: Csal_1770

Species: Chromohalobacter salexigens DSM 3043

Subunit composition of S-sulfolactate dehydrogenase = [SlcC]2
         S-sulfolactate dehydrogenase subunit = SlcC

The native apparent molecular mass of this enzyme was determined by gel filtration chromatography, which suggested a homodimeric subunit structure [Denger10].

This novel enzyme catalyzes the conversion of the (S)-enantiomer of (RS)-3-sulfolactate (racemic sulfolactate) to 3-sulfopyruvate [Denger10]. SlcC is one of three sulfolactate oxidoreductases, the other two being ComC (EC, which functions either biosynthetically (in pathway coenzyme M biosynthesis I) or degradatively (in pathway sulfolactate degradation I), and the membrane-bound SlcD (EC 1.1.99.-), identified in Roseovarius nubinhibens ISM [Denger09].

The enzyme was purified from crude extracts. Peptide-mass fingerprinting of the purified S-sulfolactate dehydrogenase confirmed its identity as the product of this gene [Denger10].

Enzyme activity was present in (RS)-3-sulfolactate-grown cells, but not in acetate-grown cells, demonstrating its inducibility [Denger10].
The subunit apparent molecular mass was determined by SDS-PAGE [Denger10].

Molecular Weight of Polypeptide: 33.135 kD (from nucleotide sequence), 34.0 kD (experimental) [Denger10 ]

Molecular Weight of Multimer: 61.0 kD (experimental) [Denger10]

Unification Links: Protein Model Portal:Q1QWN6 , String:290398.Csal_1770 , UniProt:Q1QWN6

Relationship Links: Entrez-Nucleotide:PART-OF:CP000285 , InterPro:IN-FAMILY:IPR006139 , InterPro:IN-FAMILY:IPR006140 , InterPro:IN-FAMILY:IPR016040 , Pfam:IN-FAMILY:PF00389 , Pfam:IN-FAMILY:PF02826 , Prosite:IN-FAMILY:PS00670 , Prosite:IN-FAMILY:PS00671

Gene-Reaction Schematic: ?

Gene-Reaction Schematic

Created 22-Sep-2010 by Fulcher CA , SRI International
Revised 23-Sep-2010 by Fulcher CA , SRI International

Enzymatic reaction of: S-sulfolactate dehydrogenase

Synonyms: S-sulfolactate oxidoreductase, S-sulfolactate:NAD+ oxidoreductase

EC Number:

(2S)-3-sulfolactate + NAD+ <=> 3-sulfopyruvate + NADH + H+

The reaction direction shown, that is, A + B ↔ C + D versus C + D ↔ A + B, is in accordance with the direction of enzyme catalysis.

This reaction is reversible. [Denger10]

In Pathways: sulfolactate degradation I

The assay for this enzyme was based on the 3-sulfopyruvate-dependent oxidation of NADH. Enzyme activity was demonstrated in both the forward and reverse directions. It was specific for NAD+ as co-substrate and NADP+ could not substitute. The Km value for (RS)-3-sulfolactate was 7 mM [Denger10].

The following were not substrates and were not inhibitory: pyruvate, oxaloacetate, (S)-3-phosphoglycerate, (R)-malate, (R)-lactate, (S)-malate and (S)-lactate [Denger10].

Kinetic Parameters:

Km (μM)


Denger09: Denger K, Mayer J, Buhmann M, Weinitschke S, Smits TH, Cook AM (2009). "Bifurcated degradative pathway of 3-sulfolactate in Roseovarius nubinhibens ISM via sulfoacetaldehyde acetyltransferase and (S)-cysteate sulfolyase." J Bacteriol 191(18);5648-56. PMID: 19581363

Denger10: Denger K, Cook AM (2010). "Racemase activity effected by two dehydrogenases in sulfolactate degradation by Chromohalobacter salexigens: purification of (S)-sulfolactate dehydrogenase." Microbiology 156(Pt 3);967-74. PMID: 20007648

Report Errors or Provide Feedback
Please cite the following article in publications resulting from the use of MetaCyc: Caspi et al, Nucleic Acids Research 42:D459-D471 2014
Page generated by SRI International Pathway Tools version 19.0 on Thu Oct 8, 2015, biocyc13.