Source:http://linkedlifedata.com/resource/pubmed/id/11377982
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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
2-3
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pubmed:dateCreated |
2001-5-29
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pubmed:abstractText |
Dehydroepiandrosterone sulfate is the most abundant sulfated steroid transformed in human tissues and serves as a precursor for steroid hormones. Recombinant human dehydroepiandrosterone sulfotransferase (DHEA-ST) expressed in glutathione sulfotransferase fusion form in E. coli was purified using glutathione sepharose 4B affinity adsorption chromatography, a Factor Xa cleavage step, and Q-sepharose fast flow column chromatography. The homogeneous preparation had an activity toward dehydroepiandrosterone (DHEA) of 150+/-40 nmol/min per mg of protein under the assay conditions at an overall yield of 38.4%. The recombinant human DHEA-ST was shown to have a subunit mass of 34 kDa by sodium dodecyl sulfate polyacrylamide gel electrophoresis, while having a molecular mass of 67.2 kDa by Superose-12 gel filtration. Our results indicate that the active recombinant enzyme expressed in E. coli is a homodimer.Biochemical properties for purified DHEA-ST were studied using DHEA as a substrate. The optimum pH ranged from pH 7 to 8, and the optimum temperature 40-45 degrees C. Ninety percent of basal DHEA-ST activity remained even after the enzyme was treated at 45 degrees C for 15 min. The 50% inactivation concentration of NaCl for DHEA-ST activity was determined to be around 500 mM. The K(m) value for DHEA was 1.9+/-0.3 microM and V(max)=190+/-18 nmol/min per mg of protein at 37 degrees C, pH 7.5.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical | |
pubmed:status |
MEDLINE
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pubmed:month |
May
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pubmed:issn |
0960-0760
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
77
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
159-65
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pubmed:dateRevised |
2006-11-15
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pubmed:meshHeading |
pubmed-meshheading:11377982-Chromatography, Affinity,
pubmed-meshheading:11377982-Chromatography, Gel,
pubmed-meshheading:11377982-Electrophoresis, Polyacrylamide Gel,
pubmed-meshheading:11377982-Escherichia coli,
pubmed-meshheading:11377982-Humans,
pubmed-meshheading:11377982-Hydrogen-Ion Concentration,
pubmed-meshheading:11377982-Kinetics,
pubmed-meshheading:11377982-Recombinant Proteins,
pubmed-meshheading:11377982-Substrate Specificity,
pubmed-meshheading:11377982-Sulfotransferases
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pubmed:year |
2001
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pubmed:articleTitle |
Human dehydroepiandrosterone sulfotransferase: purification and characterization of a recombinant protein.
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pubmed:affiliation |
MRC Group in Oncology and Molecular Endocrinology Laboratory, CHUL Research Center and Laval University, 2705 Laurier Boulevard, Sainte-Foy, Quebec, Canada G1V 4G2.
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pubmed:publicationType |
Journal Article
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