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)

Helicobacter pylori has been demonstrated as an etiologic agent of human gastritis and peptic ulcer formation. However, there is no straightforward basis to distinguish different isolates. We used the polymerase chain reaction (PCR) to amplify the urease structural subunit genes, ureA and ureB, which, when digested with appropriate restriction endonucleases, allow the differentiation of patterns on agarose gels. PCR amplification was possible with DNA rapidly extracted from H. pylori by alkaline lysis and phenol-chloroform. The 2.4-kb PCR products amplified from 22 clinical isolates and subjected to HaeII restriction endonuclease digestion produced 10 distinct patterns on agarose gels, with two patterns being shared between five and six strains. PCR amplification of the urease genes may enable the differentiation of closely related H. pylori strains by restriction digest analysis of PCR-amplified ureA and ureB genes.
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PMID:Use of polymerase chain reaction-amplified Helicobacter pylori urease structural genes for differentiation of isolates. 131 51

To evaluate the sensitivity of a polymerase chain reaction (PCR) assay using nested primers in detecting Helicobacter pylori, gastric tissue biopsy specimens were collected on endoscopy from 17 patients with a duodenal ulcer. DNA was extracted by phenol/chloroform treatment or boiling in water, and then subjected to a nested PCR using two primer pairs from the urease gene of Helicobacter pylori. Fourteen of the 17 patients were positive for Helicobacter pylori using DNA samples extracted by either method. The PCR results correlated well with the results of an enzyme immunoassay to detect IgG antibody. However, there were two culture negative patients. The three PCR negative patients were both culture negative and serologically negative. DNA from 9 of the 14 patients was randomly selected and subjected to semiquantification by serial dilutions, and then PCR. The results showed that phenol/chloroform extraction yielded 10-1000 times more DNA than the boiling method. It is concluded that the PCR assay is a rapid and sensitive method for detecting Helicobacter pylori, and that phenol/chloroform extraction is superior to simple boiling in obtaining DNA samples for PCR.
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PMID:Detection of Helicobacter pylori in gastric biopsy tissue by polymerase chain reaction. 835 5

The ethanolic extract derived from aerial parts of an indigenous medicinal plant Paeonia emodi was screened for enzyme inhibition activities against Urease (jack bean and Bacillus pasteurii) and alpha-Chymotrypsin. The extract was also investigated for its radical scavenging activity using DPPH assay. The crude extract was found to possess significant enzyme inhibition activities against jack bean (74%) and Bacillus pasteurii (80%) urease and a moderate activity (54%) against alpha-Chymotrypsin. The extract also displayed excellent (83%) radical scavenging activity. On the basis of these results, the crude extract was subsequently fractionated into n-hexane, chloroform, ethyl acetate, n-butanol and water fractions and tested independently for the aforesaid activities. Significant inhibitory activity against urease enzyme was observed for the ethyl acetate, n-butanol and water fractions while the n-hexane and chloroform fractions were devoid of any such activity. In the alpha-Chymotrypsin enzyme inhibition studies the activity was concentrated into the ethyl acetate fraction. All the fractions displayed potent radical scavenging activity. The crude extract and fractions thereof were also subjected to total phenolic content determination. A correlation between radical scavenging capacities of extracts and total phenolic content was observed in the majority of cases.
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PMID:Enzyme inhibition and radical scavenging activities of aerial parts of Paeonia emodi Wall (Paeoniaceae). 1611 95

Phytochemical investigations on the chloroform and ethyl acetate soluble fractions of the roots of Ranunculus repens led to the isolation of methyl 3,4,5-trihydroxybenzoate 1, R(+)- 4-methoxydalbergione 2 and R(+)-dalbergiophenol 3. The structures of these compounds were established through spectral studies including 1D and 2D NMR experiments and by comparison with literature data. These compounds showed potent inhibitory activity against urease.
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PMID:New natural urease inhibitors from Ranunculus repens. 1657 May

In vitro enzymes inhibition activities of the crude methanolic extract and various fractions of Colchicum luteum Baker (Liliaceae) including chloroform, ethyl acetate, n-butanol and aqueous were carried out against actylcholinesterase, butyrylcholinesterase, lipoxygenase and urease enzymes. A significant enzyme inhibition activity (89%) is shown by the crude methanolic extract and its fractions against lipoxygenase, while low to significant activity (32-75%) was evident against butyrylcholinesterase. The crude methanolic extract and its various fractions demonstrated low activity (29-61%) against acetylcholinesterase and no activity against urease.
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PMID:Inhibition activities of Colchicum luteum baker on lipoxygenase and other enzymes. 1705 79

Phytochemical investigations on the chloroform and ethyl acetate soluble fractions of the roots of the Daphne oleoids led to the isolation of the coumarin glycosides 1-6. Compound 5 with IC50 values 22.05 and 26.30 microM repectively, was found to be the most active of these compounds when screened against Bacillus pasteurii and jack bean urease enzymes in a concentration-dependent fashion.
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PMID:Novel urease inhibitors from Daphne oleoids. 1719 22

The crude methanolic extract and various fractions of Andrachne cardifolia Muell, including chloroform, ethyl acetate and n-butanol fractions were subjected to in vitro enzyme inhibition activity against acetylcholinesterase, butyrylcholinesterase, lipoxygenase and urease enzymes. A significant enzyme inhibition activity (40-89%) was shown by the crude methanolic extract and its fractions against lipoxygenase, while low to significant activity (40-71%) against butyrylcholinesterase. The crude methanolic extract and its various fractions demonstrated poor to significant activity (25-73%) against acetylcholinesterase and no activity against urease.
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PMID:Enzyme inhibition activities of Andrachne cardifolia Muell. 1751 51

An alcoholic extract obtained from the rhizomes of Gloriosa superba Linn (Colchicaceae) was screened for enzyme inhibition activities. The crude extract and its subsequent fractions including chloroform, ethyl acetate, n-butanol and aqueous were screened against lipoxygenase, actylcholinesterase, butyrylcholinesterase and urease. An outstanding inhibition on lipoxygenase was observed. The highest enzyme inhibition potency was expressed by the chloroform fraction (90%) among the tested fractions on lipoxygenase. Overall 67-90% inhibition was found for lipoxygenase, 46-69% for acetylcholinesterase and 10-33% for butyrylcholinesterase, while urease was not inhibited.
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PMID:Enzyme inhibition activities of the extracts from rhizomes of Gloriosa superba Linn (Colchicaceae). 1823 25

The crude methanolic extract and chloroform, ethyl acetate and n-butanol fractions of Teucrium royleanum were examined as inhibitors of actylcholinesterase, butyrylcholinesterase, lipoxygenase and urease. A significant enzyme inhibition activity (52-83%) was shown by the crude methanolic extract and its fractions against acetylcholinesterase, while low to outstanding enzyme inhibitory activity was shown (19-93%) against butyrylcholinesterase. The crude methanolic extract and its various fractions demonstrated low activity against lipoxygenase and inactive against urease.
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PMID:Enzyme inhibition activities of Teucrium royleanum. 1823 27

Helicobacter pylori (H. pylori) infection is now established as the major pathogenic factor in chronic gastritis and peptic ulcer disease. In addition, there is accumulating evidence thatH. pylori plays an important role in the process of gastric carcinogenesis. On the other hand, oriental traditional medicines have been used for stomach disease for thousands of years. In the present study, methanol extract from the stem bark ofMagnolia sieboldii (M. sieboldii) and its components were investigated on their inhibitory effects against urease activity and growth ofH. pylori in vitro. The methanol extract ofM. sieboldii significantly inhibited the growth ofH. pylori ATCC 43504 at 5 mg/ml. From the further fractionation, the chloroform fraction inhibited the bacterial growth dose-dependently. Among four fractions separated from the chloroform fraction by silica gel column chromatography, MS-C-2 was the most potent. Costunolide was isolated from the MS-C-2 subfraction by preparative TLC and recrystallization using n-hexane. Anti-H. pylori effect of costunolide was investigated using one commercial strain (H. pylori ATCC 43504) and three clinical strains (H. pylori 4, 43, 82548). Costunolide exhibited potent anti-H. pylori activity, and the MIC was around 100-200 mug/ml. However, costunolide had no inhibitory effect ofH. pylori urease activity at the concentration used for the growth inhibition assay. From these results, we conclude that costunolide inhibits the growth ofH. pylori by the independent manner ofH. pylori urease inhibition.
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PMID:Anti-Helicobacter pylori effect of costunolide isolated from the stem bark ofMagnolia sieboldii. 1897 64


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