IUBMB Enzyme Nomenclature


Accepted name: sulfoquinovose isomerase

Reaction: (1) β-sulfoquinovose = 6-deoxy-6-sulfo-D-fructose
(2) β-sulfoquinovose = 6-sulfo-D-rhamnose

For diagram of reaction, click here

Glossary: sulfoquinovose = 6-deoxy-6-sulfo-D-glucopyranose

Other name(s): yihS (gene name)

Systematic name: 6-deoxy-6-sulfo-β-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, PDB, CAS registry number:


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. [PMID: 24463506]

2. Sharma, M., Abayakoon, P., Epa, R., Jin, Y., Lingford, J.P., Shimada, T., Nakano, M., Mui, J.W., Ishihama, A., Goddard-Borger, E.D., Davies, G.J. and Williams, S.J. Molecular basis of sulfosugar selectivity in sulfoglycolysis. ACS Cent. Sci. 7 (2021) 476-487. [PMID: 33791429]

[EC created 2014, modified 2022]

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