Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound   Target Concepts: Gene/Protein Disease Symptom Drug Enzyme Compound

---

Query: EC:3.1.3.1 (alkaline phosphatase)
47,916 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Idiopathic hepatic fibrosis was diagnosed by liver biopsy in 15 young dogs, of which nine were German shepherds. Clinical signs included ascites, anorexia, weight loss and hepatic encephalopathy. Erythrocyte microcytosis was a consistent clinical feature, and clinical chemistry generally revealed hypoproteinaemia and high serum activities of alkaline phosphatase and, to a smaller extent, alanine aminotransferase. Fasting blood ammonia and serum bile acid concentrations were increased in most dogs examined, and all the dogs tested had prolonged retention of sulfobromophthalein at 30 minutes. Multiple acquired portosystemic shunts were revealed by laparotomy and/or portography. Non-inflammatory fibrosis was present to different degrees in all the dogs' livers, and on the basis of its predominant location these were classified as having central perivenous fibrosis, diffuse pericellular fibrosis or periportal fibrosis. The response to symptomatic treatment and anti-fibrotic therapy with glucocorticosteroids or colchicine was variable. Seven dogs died or were euthanased shortly after diagnosis, but one dog survived two-and-a-half years, and three dogs were still alive more than four years after the initial diagnosis.
...
PMID:Idiopathic hepatic fibrosis in 15 dogs. 821 1

The Escherichia coli codBA operon encodes cytosine permease (CodB) and cytosine deaminase (CodA). CodB mediates uptake of exogenously supplied cytosine, and CodA catalyses the hydrolytic deamination of cytosine to uracil and ammonia. The hydropathic profile of CodB indicates that it is an integral cytoplasmic membrane protein possessing several transmembrane-spanning domains. The membrane topology of CodB was investigated by using gene fusions containing varying lengths of the amino-terminus of CodB fused to either alkaline phosphatase (AP) or beta-galactosidase (BG). The AP activities expressed by the CodB-AP fusions are consistent with a topological model in which the amino- and the carboxy-termini of CodB are located in the cytoplasm, and in which CodB possesses 12 membrane-spanning segments. The enzyme activities of most of the CodB-BG fusions support the model. However, the results obtained with some of the CodB-BG fusions illustrate the limitations of using BG as a reporter protein in studies of membrane protein topology.
...
PMID:Membrane topology analysis of the Escherichia coli cytosine permease. 853 18

DNA topoisomerase I was partially purified from the hepatopancreas of the shrimp Penaeus japonicus. The specific activity of the final preparation was 7,000,000 units/mg of protein with SV40 viral DNA as substrate. SDD-polyacrylamide gel electrophoresis of the final preparation yielded two major bands of proteins with M(r) 70,000 and M(r) 67,000, as well as less intense bands of proteins with M, 64,000 and M(r) 56,000. Incubation of the partially purified enzyme fraction with rabbit antiserum against human DNA topoisomerase I, allowed all these proteins except that of M(r) 56,000, to be positively reacted. Treatment of the partially purified DNA topoisomerase I with tyrosine kinase p43v-abl resulted in phosphorylation of only the two major subunits. Phosphorylation by tyrosine kinase p43v-abl or dephosphorylation by phosphotyrosyl protein phosphatase resulted in a decrease of the enzymatic activity. The treatment with shrimp alkaline phosphatase abolished the enzymatic activity of the purified DNA topoisomerase I in a dose-dependent manner. Thus, the DNA topoisomerase I was apparently isolated from the hepatopancreas of the shrimp P. japonicus in a phosphorylated form, and this phosphorylation was essential for expression of enzymatic activity in vitro. The activity of DNA topoisomerase I is inhibited by ZnCl2, CuCl2 and Pb(NH3)3 at millimolar concentrations, but less inhibition was observed with CaCl2.
...
PMID:Modification of DNA topoisomerase I enzymatic activity with phosphotyrosyl protein phosphatase and alkaline phosphatase from the hepatopancreas of the shrimp Penaeus japonicus (Crustacea:Decapoda). 875 89

Understanding of the possible toxicity associated with hypervitaminosis A becomes increasingly important in view of the popularity of vitamin A supplementation. Hypervitaminosis A for many years may eventually lead to hepatocellular damage. In the present study, rats were treated for 7 days with high doses of retinol to study the early effects on the metabolism of different types of liver cells using (enzyme) histochemistry, immunohistochemistry and electron microscopy. Excessive intake of vitamin A activates Kupffer cells and induces accumulation of lipid droplets in fat-storing cells as well as proliferation of these cells. Moreover, it affects the metabolic heterogeneity in the liver lobules, but does not lead to apparent cell damage. Based on the changes in marker enzymes for different metabolic processes, it is concluded that the capacity for breakdown of purines, the antioxidant capacity, the potential for phagocytosis and the regulation of ammonia levels were largely decreased. Increased alkaline phosphatase activity in hepatocytes pointed to an activated process of transport of retinol esters over the bile canalicular membrane. The possible causes of these metabolic changes have been described in the discussion.
...
PMID:Early effects of high doses of retinol (vitamin A) on the in situ cellular metabolism in rat liver. 886 71

Up-to-date, most patients with serious chronic hepatic disease are best treated by liver transplantation. It has been confirmed the striking benefit of liver transplantation also for patients with glycogen storage disease or homozygous familial hypercholesterolemia who were refractory to medical treatment. Nevertheless, the advantage of achieving palliation without transplantation, thereby avoiding the need for chronic immunosuppression, is obvious. With reference to the mentioned above diseases, end-to-side portacaval shunt was used. A favourable effect was noted on body growth and a number of metabolic abnormalities. Hepatic failure did not occur, although in a few patients blood ammonia concentrations and serum alkaline phosphatase levels increased relative to preoperative values. To avoid an incomplete palliation provided by portacaval shunt, appropriate case selection is a problem. The Authors report their personal experience with portacaval shunt for the treatment of glycogenosis and familial hypercholesterolemia.
...
PMID:[Surgical therapy of metabolic liver diseases (glycogenosis, hypercholesterolemia)]. 957 79

The nucleotide-dependent tetramerization of purified native URA7-encoded CTP synthetase (EC 6.3.4.2, UTP: ammonia ligase (ADP-forming)) from the yeast Saccharomyces cerevisiae was characterized. CTP synthetase existed as a dimer in the absence of ATP and UTP. In the presence of saturating concentrations of ATP and UTP, the CTP synthetase protein existed as a tetramer. Increasing concentrations of ATP and UTP caused a dose-dependent conversion of the dimeric species to a tetramer. The kinetics of enzyme tetramerization correlates with the kinetics of enzyme activity. The tetramerization of CTP synthetase was dependent on UTP and Mg2+ ions. ATP facilitated the UTP-dependent tetramerization of CTP synthetase by a mechanism that involved the ATP-dependent phosphorylation of UTP catalyzed by the enzyme. The glutaminase reaction that is catalyzed by the enzyme was not required for enzyme tetramerization. CTP, a potent inhibitor of CTP synthetase activity, did not inhibit the ATP/UTP-dependent tetramerization of the enzyme. Phosphorylation of the purified native CTP synthetase with protein kinase A and protein kinase C facilitated the nucleotide-dependent tetramerization. Dephosphorylation of native CTP synthetase with alkaline phosphatase prevented the nucleotide-dependent tetramerization of the enzyme. This correlated with the inactivation of CTP synthetase activity. Rephosphorylation of the dephosphorylated enzyme with protein kinase A and protein kinase C resulted in a partial restoration of the nucleotide-dependent tetramerization of the enzyme. This tetramerization correlated with the partial restoration of CTP synthetase activity. Taken together, these results indicated that enzyme tetramerization was required for CTP synthetase activity and that enzyme phosphorylation played an important role in the tetramerization and regulation of the enzyme.
...
PMID:Nucleotide-dependent tetramerization of CTP synthetase from Saccharomyces cerevisiae. 963 43

In the presence of amine-containing sulfhydryl compounds, binding of heat-transformed cytosolic rat liver glucocorticoid receptor complex (GRC) to double-stranded calf thymus DNA-coated cellulose and to rat liver chromatin was enhanced up to 10-fold. These observations were made under conditions when a maximum of 8% of the total GRC bound to DNA in the absence of test compound. Compounds which did not contain both a sulfhydryl and amine group were inactive. Phosphorothioate derivatives of the active sulfhydryl compounds were also inactive. However, pretreatment of the phosphorothioate compounds with alkaline phosphatase restored activity. Upon centrifugation at 8800g, amine-containing disulfide compounds at millimolar concentrations caused considerable sedimentation of the GRC in the absence of DNA-coated cellulose or chromatin and no apparent increase in GRC binding to DNA or chromatin. Amine-containing disulfide compounds at micromolar concentrations did not cause heavy sedimentation of the GRC and enhanced binding of the GRC to DNA-coated cellulose up to 9.5-fold. Thus, diaminosulfhydryl compounds and the disulfide 1,18-diamino-6,13-diaza-9,10-dithiaoctadecane (WR 149,024) possess both the ability to restore and preserve the steroid binding capacity of the glucocorticoid receptor and to enhance binding of the GRC to DNA and chromatin.
...
PMID:Aminosulfhydryl and aminodisulfide compounds enhance binding of the glucocorticoid receptor complex to deoxyribonucleic acid-coated cellulose and to chromatin. 983 77

Glycosylation is both cell line and protein dependent. Culture conditions can also influence the profile of glycoforms produced. To examine this possibility in the insect cell/baculovirus system, structures of N-linked oligosaccharides attached to SEAP (human secreted alkaline phosphatase), expressed under various culture conditions in BTI Tn5B1-4 cells, were characterized using FACE (fluorescence-assisted carbohydrate electrophoresis). Parameters varied were time of harvest, ammonia added during infection, dissolved oxygen, and temperature. It was found that glycosylation in the insect cell/baculovirus expression system is a robust, stable system that is less perturbed by variations in culture conditions than the level of protein expression. Addition of ammonia and low oxygen conditions affected SEAP expression, but not the oligosaccharide profile of SEAP. Time of SEAP harvest increased the amount of alpha-mannosidase resistant structures from 4.1% at 34 hours postinfection (h pi), to 5.0% at 100 h pi, and to 7.5% at 120 h pi. These structures were primarily sensitive to N-acetylhexosaminidase digest, although a small amount was insensitive to both mannosidase and N-acetyl-hexosaminidase digests. Lowering the temperature from 28 degrees C to 24 degrees C or even 20 degrees C, resulted in a twofold increase in oligosaccharides containing terminal alpha(1,3)-mannose residues. This condition did not affect the amount of mannosidase-resistant structures. However, this could result in more complete glycosylation of recombinant proteins in the BTI Tn5B1-4 cell line, because more structures with the potential for further processing would be produced.
...
PMID:Glycosylation of a recombinant protein in the Tn5B1-4 insect cell line: influence of ammonia, time of harvest, temperature, and dissolved oxygen. 1009 4

We report a case of spondylometaphyseal dysplasia in an infant who was born to nonconsanguineous Yemeni parents. Radiological findings were consistent with lethal metaphyseal chondrodysplasia (Sedaghatian type). Although all previously reported cases died within 4 days of life, our patient survived 161 days. This reported case was thoroughly investigated for serum calcium, magnesium, zinc, ammonia, phosphate level, alkaline phosphatase, parathormone level, liver and renal function test, TORCH, metabolic screening, skeletal survey, chromosomal studies, muscle enzymes, EEG, computed tomography scan, and magnetic resonance imaging (brain). Genomic DNA analysis of patient and parents were sent to the Faculty de Medicine Xavier Bichat, France, but yet abnormal gene could not be detected.
...
PMID:Spondylometaphyseal dysplasia: Sedaghatian type. 1067 56

Ammonia oxidation is a rate-limiting step in the biological removal of nitrogen from wastewater. Analysis of microbial communities possessing the amoA gene, which is a small subunit of the gene encoding ammonia monooxygenase, is important for controlling nitrogen removal. In this study, the amoA gene present in Nitrosomonas europaea cells in a pure culture and biofilms in a nitrifying reactor was amplified by in situ PCR. In this procedure, fixed cells were permeabilized with lysozyme and subjected to seminested PCR with a digoxigenin-labeled primer. Then, the amplicon was detected with an alkaline phosphatase-labeled antidigoxigenin antibody and HNPP (2-hydroxy-3-naphthoic acid-2'-phenylanilide phosphate), which was combined with Fast Red TR, and with an Alexa Fluor 488-labeled antidigoxigenin antibody. The amoA gene in the biofilms was detected with an unavoidable nonspecific signal when the former method was used for detection. On the other hand, the amoA gene in the biofilms was detected without a nonspecific signal, and the cells possessing the amoA gene were clearly observed near the surface of the biofilm when Alexa Fluor 488-labeled antidigoxigenin antibody was used for detection. Although functional gene expression was not detected in this study, detection of cells in a biofilm based on their function was demonstrated.
...
PMID:Direct detection by in situ PCR of the amoA gene in biofilm resulting from a nitrogen removal process. 1167 54


<< Previous 1 2 3 4 5 6 7 8 9 10 Next >>

---