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. 1980 Apr 1;187(1):181–190. doi: 10.1042/bj1870181

Substrate specificity and other properties of the inducible S3 secondary alkylsulphohydrolase purified from the detergent-degrading bacterium Pseudomonas C12B.

D J Shaw, K S Dodgson, G F White
PMCID: PMC1162506  PMID: 7406859

Abstract

The inducible S3 secondary alkylsulphohydrolase of the soil bacterium Pseudomonas C12B was purified to homogeneity (683-fold from cell-free extracts by a combination of column chromatography on DEAE-cellulose. Sephadex G-100 and Blue Sepharose CL-6B. The enzyme has a molecular weight in the region of 40000--46000, and is active over a broad range of pH from 5 to 9, with maximum activity at pH 8.2. The preferred substrates of the enzyme are the symmetrical secondary alkylsulphate esters such as heptan-4-yl sulphate and nonan-5-yl sulphate and the asymmetric secondary octyl and nonyl sulphate esters with the sulphate group attached to C-3 or C-4. However, for each asymmetric ester, the L-isomer is much more readily hydrolysed than the D-isomer. This specificity is interpreted in terms of a three-point attachment of the substrate to the enzyme's active site. The alkyl chains on either side of the esterified carbon atom are bound in two separate sites, one of which can only accommodate alkyl chains of limited size. The third site binds the sulphate group. Enzymic hydrolysis of this group is accompanied by complete inversion of configuration at the asymmetric carbon atom. The implied cleavage of the C--O bond of the C--O--S ester linkage was confirmed by 18O-incorporation studies.

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Selected References

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