Biomaterial Database

Expression of human kidney 11beta-hydroxysteroid dehydrogenase (11-HSD2) in bacteria. 1999

B S Nunez, and T Mune, and P C White

Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, Texas, 75235-9063, USA.

The kidney isozyme of 11beta-hydroxysteroid dehydrogenase (11-HSD2) protects the mineralocorticoid receptor from spurious activation by glucocorticoids. To explore structure-function relationships, human 11-HSD2 cDNA was subcloned into the bacterial expression vector, pET25b. E. coli transformed with wild-type cDNA produced active enzyme that retained biochemical characteristics of the native protein. The addition of 6 histidine residues to the C-terminus of the wild-type enzyme (11-HSD2/His) increased activity 2-fold. Whereas wild-type activity was almost completely sedimented following 100,000g centrifugation, 10-30% of total activity of 11-HSD2/His remained in the supernatant. The 11-HSD2 isozyme normally contains three N-terminal hydrophobic domains. Mutant 11-HSD2/His possessing a single hydrophobic domain retained partial activity, but elimination of all domains inactivated the enzyme. Thus, the N-terminal hydrophobic domains are essential for complete activity of 11-HSD2 but association with an intact cell membrane is not.

UI	MeSH Term	Description	Entries
D007527	Isoenzymes	Structurally related forms of an enzyme. Each isoenzyme has the same mechanism and classification, but differs in its chemical, physical, or immunological characteristics.	Alloenzyme,Allozyme,Isoenzyme,Isozyme,Isozymes,Alloenzymes,Allozymes
D007668	Kidney	Body organ that filters blood for the secretion of URINE and that regulates ion concentrations.	Kidneys
D007700	Kinetics	The rate dynamics in chemical or physical systems.
D009154	Mutation	Any detectable and heritable change in the genetic material that causes a change in the GENOTYPE and which is transmitted to daughter cells and to succeeding generations.	Mutations
D011994	Recombinant Proteins	Proteins prepared by recombinant DNA technology.	Biosynthetic Protein,Biosynthetic Proteins,DNA Recombinant Proteins,Recombinant Protein,Proteins, Biosynthetic,Proteins, Recombinant DNA,DNA Proteins, Recombinant,Protein, Biosynthetic,Protein, Recombinant,Proteins, DNA Recombinant,Proteins, Recombinant,Recombinant DNA Proteins,Recombinant Proteins, DNA
D004790	Enzyme Induction	An increase in the rate of synthesis of an enzyme due to the presence of an inducer which acts to derepress the gene responsible for enzyme synthesis.	Induction, Enzyme
D004926	Escherichia coli	A species of gram-negative, facultatively anaerobic, rod-shaped bacteria (GRAM-NEGATIVE FACULTATIVELY ANAEROBIC RODS) commonly found in the lower part of the intestine of warm-blooded animals. It is usually nonpathogenic, but some strains are known to produce DIARRHEA and pyogenic infections. Pathogenic strains (virotypes) are classified by their specific pathogenic mechanisms such as toxins (ENTEROTOXIGENIC ESCHERICHIA COLI), etc.	Alkalescens-Dispar Group,Bacillus coli,Bacterium coli,Bacterium coli commune,Diffusely Adherent Escherichia coli,E coli,EAggEC,Enteroaggregative Escherichia coli,Enterococcus coli,Diffusely Adherent E. coli,Enteroaggregative E. coli,Enteroinvasive E. coli,Enteroinvasive Escherichia coli
D006801	Humans	Members of the species Homo sapiens.	Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D006913	Hydroxysteroid Dehydrogenases	Enzymes of the oxidoreductase class that catalyze the dehydrogenation of hydroxysteroids. (From Enzyme Nomenclature, 1992) EC 1.1.-.	Hydroxysteroid Dehydrogenase,Dehydrogenase, Hydroxysteroid,Dehydrogenases, Hydroxysteroid
D014461	Ultracentrifugation	Centrifugation with a centrifuge that develops centrifugal fields of more than 100,000 times gravity. (McGraw-Hill Dictionary of Scientific and Technical Terms, 4th ed)