Sulfoquinovosidase

UniProtKB accession:  P32138

Grouped By:  Matching UniProtKB accession

UniProtKB description:  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 (PubMed:26878550). Is also able to hydrolyze simple sulfoquinovosides such as sulfoquinovosyl glycerol (SQGro) (PubMed:26878550, PubMed:30276262). In vitro, can use the substrate analog para-nitrophenyl alpha-sulfoquinovoside (PNPSQ), but shows no detectable activity toward 4-nitrophenyl alpha-D-glucopyranoside (PNPGlc) (PubMed:26878550, PubMed:30276262). 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).