The Enzyme Database

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EC 1.1.1.373     
Accepted name: sulfolactaldehyde 3-reductase
Reaction: 2,3-dihydroxypropane-1-sulfonate + NAD+ = 2-hydroxy-3-oxopropane-1-sulfonate + NADH + H+
For diagram of sulphoglycolysis of sulfoquinovose, click here
Glossary: 2-hydroxy-3-oxopropane-1-sulfonate = sulfolactaldehyde
Other name(s): yihU (gene name)
Systematic name: 2,3-dihydroxypropane-1-sulfonate:NAD+ 3-oxidoreductase
Comments: The enzyme, characterized from the bacterium Escherichia coli, is involved in the degradation pathway of sulfoquinovose, the polar headgroup of sulfolipids found in the photosynthetic membranes of all higher plants, mosses, ferns, algae, and most photosynthetic bacteria, as well as the surface layer of some archaea.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Denger, K., Weiss, M., Felux, A.K., Schneider, A., Mayer, C., Spiteller, D., Huhn, T., Cook, A.M. and Schleheck, D. Sulphoglycolysis in Escherichia coli K-12 closes a gap in the biogeochemical sulphur cycle. Nature 507 (2014) 114–117. [DOI] [PMID: 24463506]
[EC 1.1.1.373 created 2014]
 
 
EC 1.1.1.390     
Accepted name: sulfoquinovose 1-dehydrogenase
Reaction: sulfoquinovose + NAD+ = 6-deoxy-6-sulfo-D-glucono-1,5-lactone + NADH + H+
Glossary: sulfoquinovose = 6-deoxy-6-sulfo-D-glucopyranose
Systematic name: 6-deoxy-6-sulfo-D-glucopyranose:NAD+ 1-oxidoreductase
Comments: The enzyme, characterized from the bacterium Pseudomonas putida SQ1, participates in a sulfoquinovose degradation pathway. Activity with NADP+ is only 4% of that with NAD+.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Felux, A.K., Spiteller, D., Klebensberger, J. and Schleheck, D. Entner-Doudoroff pathway for sulfoquinovose degradation in Pseudomonas putida SQ1. Proc. Natl. Acad. Sci. USA 112 (2015) E4298–E4305. [DOI] [PMID: 26195800]
[EC 1.1.1.390 created 2015]
 
 
EC 1.2.1.97     
Accepted name: 3-sulfolactaldehyde dehydrogenase
Reaction: (2S)-3-sulfolactaldehyde + NAD(P)+ + H2O = (2S)-3-sulfolactate + NAD(P)H + H+
Glossary: (2S)-3-sulfolactaldehyde = (2S)-2-hydroxy-3-oxopropane-1-sulfonate
Other name(s): SLA dehydrogenase
Systematic name: (2S)-3-sulfolactaldehyde:NAD(P)+ oxidoreductase
Comments: The enzyme, characterized from the bacterium Pseudomonas putida SQ1, participates in a sulfoquinovose degradation pathway. Also acts on succinate semialdehyde.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Felux, A.K., Spiteller, D., Klebensberger, J. and Schleheck, D. Entner-Doudoroff pathway for sulfoquinovose degradation in Pseudomonas putida SQ1. Proc. Natl. Acad. Sci. USA 112 (2015) E4298–E4305. [DOI] [PMID: 26195800]
[EC 1.2.1.97 created 2015]
 
 
EC 2.2.1.14     
Accepted name: 6-deoxy-6-sulfo-D-fructose transaldolase
Reaction: 6-deoxy-6-sulfo-D-fructose + D-glyceraldehyde 3-phosphate = (2S)-3-sulfolactaldehyde + β-D-fructofuranose 6-phosphate
Other name(s): sftT (gene name)
Systematic name: 6-deoxy-6-sulfo-D-fructose:D-glyceraldehyde-3-phosphate glyceronetransferase
Comments: The enzyme, characterized from the bacterium Bacillus aryabhattai SOS1, is involved in a degradation pathway for 6-sulfo-D-quinovose. The enzyme can also use D-erythrose 4-phosphate as the acceptor, forming D-sedoheptulose 7-phosphate.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Frommeyer, B., Fiedler, A.W., Oehler, S.R., Hanson, B.T., Loy, A., Franchini, P., Spiteller, D. and Schleheck, D. Environmental and intestinal phylum Firmicutes bacteria metabolize the plant sugar sulfoquinovose via a 6-deoxy-6-sulfofructose transaldolase pathway. iScience 23:101510 (2020). [DOI] [PMID: 32919372]
[EC 2.2.1.14 created 2021]
 
 
EC 2.7.1.184     
Accepted name: sulfofructose kinase
Reaction: ATP + 6-deoxy-6-sulfo-D-fructose = ADP + 6-deoxy-6-sulfo-D-fructose 1-phosphate
For diagram of sulphoglycolysis of sulfoquinovose, click here
Other name(s): yihV (gene name)
Systematic name: ATP:6-deoxy-6-sulfo-D-fructose 1-phosphotransferase
Comments: The enzyme, characterized from the bacterium Escherichia coli, is involved in the degradation pathway of sulfoquinovose, the polar headgroup of sulfolipids found in the photosynthetic membranes of all higher plants, mosses, ferns, algae, and most photosynthetic bacteria, as well as the surface layer of some archaea.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Denger, K., Weiss, M., Felux, A.K., Schneider, A., Mayer, C., Spiteller, D., Huhn, T., Cook, A.M. and Schleheck, D. Sulphoglycolysis in Escherichia coli K-12 closes a gap in the biogeochemical sulphur cycle. Nature 507 (2014) 114–117. [DOI] [PMID: 24463506]
[EC 2.7.1.184 created 2014]
 
 
EC 3.1.1.99     
Accepted name: 6-deoxy-6-sulfogluconolactonase
Reaction: 6-deoxy-6-sulfo-D-glucono-1,5-lactone + H2O = 6-deoxy-6-sulfo-D-gluconate
Other name(s): SGL lactonase
Systematic name: 6-deoxy-6-sulfo-D-glucono-1,5-lactone lactonohydrolase
Comments: The enzyme, characterized from the bacterium Pseudomonas putida SQ1, participates in a sulfoquinovose degradation pathway.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Felux, A.K., Spiteller, D., Klebensberger, J. and Schleheck, D. Entner-Doudoroff pathway for sulfoquinovose degradation in Pseudomonas putida SQ1. Proc. Natl. Acad. Sci. USA 112 (2015) E4298–E4305. [DOI] [PMID: 26195800]
[EC 3.1.1.99 created 2016]
 
 
EC 3.13.1.1     
Accepted name: UDP-sulfoquinovose synthase
Reaction: UDP-α-D-sulfoquinovopyranose + H2O = UDP-α-D-glucose + sulfite
For diagram of UDP-glucose, UDP-galactose and UDP-glucuronate biosynthesis, click here
Other name(s): sulfite:UDP-glucose sulfotransferase; UDPsulfoquinovose synthase; UDP-6-sulfo-6-deoxyglucose sulfohydrolase
Systematic name: UDP-6-sulfo-6-deoxy-α-D-glucose sulfohydrolase
Comments: Requires NAD+, which appears to oxidize UDP-α-D-glucose to UDP-4-dehydroglucose, which dehydrates to UDP-4-dehydro-6-deoxygluc-5-enose, to which sulfite is added. The reaction is completed when the substrate is rehydrogenated at C-4. The enzyme from Arabidopsis thaliana is specific for UDP-Glc and sulfite.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB
References:
1.  Essigmann, B., Gler, S., Narang, R.A., Linke, D. and Benning, C. Phosphate availability affects the thylakoid lipid composition and the expression of SQD1, a gene required for sulfolipid biosynthesis in Arabidopsis thaliana. Proc. Natl. Acad. Sci. USA 95 (1998) 1950–1955. [DOI] [PMID: 9465123]
2.  Essigmann, B., Hespenheide, B.M., Kuhn, L.A. and Benning, C. Prediction of the active-site structure and NAD+ binding in SQD1, a protein essential for sulfolipid biosynthesis in Arabidopsis. Arch. Biochem. Biophys. 369 (1999) 30–41. [DOI] [PMID: 10462438]
3.  Mulichak, A.M., Theisen, M.J., Essigmann, B., Benning, C. and Garavito, R.M. Crystal structure of SQD1, an enzyme involved in the biosynthesis of the plant sulfolipid headgroup donor UDP-sulfoquinovose. Proc. Natl. Acad. Sci. USA 96 (1999) 13097–13102. [DOI] [PMID: 10557279]
4.  Sanda, S., Leustek, T., Theisen, M., Garavito, R.M. and Benning, C. Recombinant Arabidopsis SQD1 converts UDP-glucose and sulfite to the sulfolipid head group precursor UDP-sulfoquinovose in vitro. J. Biol. Chem. 276 (2001) 3941–3946. [DOI] [PMID: 11073956]
[EC 3.13.1.1 created 2001, modified 2010]
 
 
EC 4.1.2.57     
Accepted name: sulfofructosephosphate aldolase
Reaction: 6-deoxy-6-sulfo-D-fructose 1-phosphate = glycerone phosphate + 2-hydroxy-3-oxopropane-1-sulfonate
For diagram of sulphoglycolysis of sulfoquinovose, click here
Glossary: glycerone phosphate = dihydroxyacetone phosphate = 3-hydroxy-2-oxopropyl phosphate
2-hydroxy-3-oxopropane-1-sulfonate = 3-sulfolactaldehyde
Other name(s): yihT (gene name)
Systematic name: 6-deoxy-6-sulfofructose-1-phosphate 2-hydroxy-3-oxopropane-1-sulfonate-lyase (glycerone-phosphate-forming)
Comments: The enzyme, characterized from the bacterium Escherichia coli, is involved in the degradation pathway of sulfoquinovose, the polar headgroup of sulfolipids found in the photosynthetic membranes of all higher plants, mosses, ferns, algae, and most photosynthetic bacteria, as well as the surface layer of some archaea.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Denger, K., Weiss, M., Felux, A.K., Schneider, A., Mayer, C., Spiteller, D., Huhn, T., Cook, A.M. and Schleheck, D. Sulphoglycolysis in Escherichia coli K-12 closes a gap in the biogeochemical sulphur cycle. Nature 507 (2014) 114–117. [DOI] [PMID: 24463506]
[EC 4.1.2.57 created 2014]
 
 
EC 4.1.2.58     
Accepted name: 2-dehydro-3,6-dideoxy-6-sulfogluconate aldolase
Reaction: 2-dehydro-3,6-dideoxy-6-sulfo-D-gluconate = (2S)-3-sulfolactaldehyde + pyruvate
Other name(s): KDSG aldolase
Systematic name: 2-dehydro-3,6-dideoxy-6-sulfo-D-gluconate (2S)-3-sulfolactaldehyde-lyase (pyruvate-forming)
Comments: The enzyme, characterized from the bacterium Pseudomonas putida SQ1, participates in a sulfoquinovose degradation pathway.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Felux, A.K., Spiteller, D., Klebensberger, J. and Schleheck, D. Entner-Doudoroff pathway for sulfoquinovose degradation in Pseudomonas putida SQ1. Proc. Natl. Acad. Sci. USA 112 (2015) E4298–E4305. [DOI] [PMID: 26195800]
[EC 4.1.2.58 created 2016]
 
 
EC 4.2.1.162     
Accepted name: 6-deoxy-6-sulfo-D-gluconate dehydratase
Reaction: 6-deoxy-6-sulfo-D-gluconate = 2-dehydro-3,6-dideoxy-6-sulfo-D-gluconate + H2O
Other name(s): SG dehydratase
Systematic name: 6-deoxy-6-sulfo-D-gluconate hydro-lyase (2-dehydro-3,6-dideoxy-6-sulfo-D-gluconate-forming)
Comments: The enzyme, characterized from the bacterium Pseudomonas putida SQ1, participates in a sulfoquinovose degradation pathway.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Felux, A.K., Spiteller, D., Klebensberger, J. and Schleheck, D. Entner-Doudoroff pathway for sulfoquinovose degradation in Pseudomonas putida SQ1. Proc. Natl. Acad. Sci. USA 112 (2015) E4298–E4305. [DOI] [PMID: 26195800]
[EC 4.2.1.162 created 2016]
 
 
EC 5.1.3.43     
Accepted name: sulfoquinovose mutarotase
Reaction: 6-sulfo-α-D-quinovose = 6-sulfo-β-D-quinovose
Systematic name: 6-sulfo-D-quinovose 1-epimerase
Comments: The enzyme is found in bacteria that possess sulfoglycolytic pathways. The enzyme can also act on other aldohexoses such as D-galactose, D-glucose, D-glucose-6-phosphate, and D-glucuronate, but with lower efficiency. Does not act on D-mannose.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Abayakoon, P., Lingford, J.P., Jin, Y., Bengt, C., Davies, G.J., Yao, S., Goddard-Borger, E.D. and Williams, S.J. Discovery and characterization of a sulfoquinovose mutarotase using kinetic analysis at equilibrium by exchange spectroscopy. Biochem. J. 475 (2018) 1371–1383. [PMID: 29535276]
[EC 5.1.3.43 created 2019]
 
 
EC 5.3.1.31     
Accepted name: sulfoquinovose isomerase
Reaction: sulfoquinovose = 6-deoxy-6-sulfo-D-fructose
For diagram of sulphoglycolysis of sulfoquinovose, click here
Glossary: sulfoquinovose = 6-deoxy-6-sulfo-D-glucopyranose
Other name(s): yihS (gene name)
Systematic name: 6-deoxy-6-sulfo-D-glucopyranose aldose-ketose-isomerase
Comments: The enzyme, characterized from the bacterium Escherichia coli, is involved in the degradation pathway of sulfoquinovose, the polar headgroup of sulfolipids found in the photosynthetic membranes of all higher plants, mosses, ferns, algae, and most photosynthetic bacteria, as well as the surface layer of some archaea.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Denger, K., Weiss, M., Felux, A.K., Schneider, A., Mayer, C., Spiteller, D., Huhn, T., Cook, A.M. and Schleheck, D. Sulphoglycolysis in Escherichia coli K-12 closes a gap in the biogeochemical sulphur cycle. Nature 507 (2014) 114–117. [DOI] [PMID: 24463506]
[EC 5.3.1.31 created 2014]
 
 


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