Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:6.3.4.6 (urease)
 7,490 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Bacteriological tests on feces of patients with ulcerative-hemorrhagic colitis, in exacerbation, were carried out. The same patients were dynamically followed up as regards clinical picture and paraclinical indices, rectoromanoscopy include. Quantitative and qualitative analysis of the fecal microflora was made according to the following indices: total number of mesophili aerobic microorganisms, coli-bacteria, proteus, enterococci, staphylococci, Salmonella-bacteria. The pure cultures isolated were tested according to 30 biochemical indices, their precise classification position being determined on that base. The production of the following enzymes was studied in the cultures isolated: protease, oxyreductase -- catalase and peroxidase, aminotransferase -- COT and GPT; phosphatase -- acid and alkaline, disaccharidase and urease. The data obtained from the bacteriological studies were compared with those of a control group of healthy subjects. Elevated enzyme constellation was found among the patients with exacerbated ulcerative-hemorrhagic colitis.
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PMID:[Intestinal bacterial microflora study in chronic ulcerohemorrhagic colitis]. 697 92

Axenic mycelia of the ectomycorrhizal basidiomycete, Suillus bovinus, were grown in liquid media under continuous aeration with compressed air at 25 degrees C in darkness. Provided with glucose as the only carbohydrate source, they produced similar amounts of dry weight with ammonia, with nitrate or with alanine, 60-80% more with glutamate or glutamine, but about 35% less with urea as the respectively only exogenous nitrogen source. In crude extracts of cells from NH4(+)-cultures, NADH-dependent glutamate dehydrogenase exhibited high aminating (688 nmol x mg protein(-1) x min(-1)) and low deaminating (21 nmol x mg protein(-1) x min(-1)) activities. Its Km-values for 2-oxoglutarate and for glutamate were 1.43 mM and 23.99 mM, respectively. pH-optimum for amination was about 7.2, that for deamination about 9.3. Glutamine synthetase activity was comparatively low (59 nmol x mg protein(-1) x min(-1)). Its affinity for glutamate was poor (Km = 23.7 mM), while that for the NH4+ replacing NH2OH was high (Km = 0.19 mM). pH-optimum was found at 7.0. Glutamate synthase (= GOGAT) revealed similar low activity (62 nmol x mg protein(-1) x min(-1)), Km-values for glutamine and for 2-oxoglutarate of 2.82 mM and 0.28 mM, respectively, and pH-optimum around 8.0. Aspartate transaminase (= GOT) exhibited similar affinities for aspartate (Km = 2.55 mM) and for glutamate (Km = 3.13 mM), but clearly different Km-values for 2-oxoglutarate (1.46 mM) and for oxaloacetate (0.13 mM). Activity at optimum pH of about 8.0 was 506 nmol x mg protein(-1) x min(-1) for aspartate conversion, but only 39 nmol x mg protein(-1) x min(-1) at optimum pH of about 7.0 for glutamate conversion. Activity (599 nmol x mg protein(-1) x min(-1)), substrate affinities (Km for alanine = 6.30 mM, for 2-oxoglutarate = 0.45 mM) and pH-optimum (6.5-7.5) proved alanine transaminase (= GPT) also important in distribution of intracellular nitrogen. There was comparatively low activity of the obviously constitutive enzyme, urease, (42 nmol x mg protein(-1) x min(-1)) whose substrate affinity was rather high (Km = 0.56 mM). Nitrate reductase proved substrate induced; activity could only be measured after exposure of the mycelia to exogenous nitrate. Routes of entry of exogenous nitrogen and tentative significance of the various enzymes in cell metabolism are discussed.
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PMID:Investigations into enzymes of nitrogen metabolism of the ectomycorrhizal basidiomycete, Suillus bovinus. 1081 9