5oht

Structural highlights

Function

[SQASE_ECOLI] Catalyzes the hydrolysis of sulfoquinovosyl diacylglycerides (SQDG) to sulfoquinovose (SQ), which is then degraded by E.coli through the SQ Embden-Meyerhof-Parnas (SQ-EMP) sulfoglycolysis pathway as a source of carbon and sulfur. Therefore, is likely involved in the utilization of the sulfoquinovose headgroup found in ubiquitous plant sulfolipids. Is also able to hydrolyze simple sulfoquinovosides such as 1-sulfoquinovosylglycerol (SQGro). Is a retaining glycoside hydrolase, since it forms the alpha anomer of SQ (PubMed:26878550). Also exhibits some alpha-glucosidase activity against alpha-glucosyl fluoride in vitro, although natural substrates, such as alpha-glucobioses are scarcely hydrolyzed (PubMed:15294295).^{[1] [2]}

References

1. ↑ Okuyama M, Mori H, Chiba S, Kimura A. Overexpression and characterization of two unknown proteins, YicI and YihQ, originated from Escherichia coli. Protein Expr Purif. 2004 Sep;37(1):170-9. PMID:15294295 doi:http://dx.doi.org/10.1016/j.pep.2004.05.008
2. ↑ Speciale G, Jin Y, Davies GJ, Williams SJ, Goddard-Borger ED. YihQ is a sulfoquinovosidase that cleaves sulfoquinovosyl diacylglyceride sulfolipids. Nat Chem Biol. 2016 Feb 15. doi: 10.1038/nchembio.2023. PMID:26878550 doi:http://dx.doi.org/10.1038/nchembio.2023