Gene/Protein Disease Symptom Drug Enzyme Compound
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Query: EC:3.2.1.31 (beta-glucuronidase)
 7,680 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The 5' flanking region of a salt-stress-inducible, CAM-specific phosphoenolpyruvate carboxylase (PEPC) gene from the facultative halophyte Mesembryanthemum crystallinum, was fused to the beta-glucuronidase (GUS) reporter gene and introduced into Nicotiana tabacum SR1. The Ppc1 promoter displayed high levels of expression in transgenic tobacco quantitatively and qualitatively similar to a full-length 35S CaMV-GUS construct. Histochemical assays revealed that the full-length Ppc1-GUS fusions expressed GUS activity in all tissues except in root tips. While tobacco is capable of utilizing the Ppc1 cis-acting regulatory regions from M. crystallinum to yield high levels of constitutive expression, this glycophyte fails to direct a stress-inducible pattern of gene expression typical of this promoter in its native, facultative halophytic host.
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PMID:Expression of a phosphoenolpyruvate carboxylase promoter from Mesembryanthemum crystallinum is not salt-inducible in mature transgenic tobacco. 844 49

Phosphoenolpyruvate carboxylase (PEPC) is a central enzyme of C4 and CAM photosynthesis but plants, in addition, contain various non-photosynthetic isoforms with characteristic and variable functions. The partial sequence and a detailed expression analysis of the PpcB and PpcC genes which encode non-photosynthetic PEPC isoforms in the C4 plant Flaveria trinervia and the C3 species F. pringlei is presented. Southern analyses showed that PpcB and PpcC sequences are most probably of single-copy in the genomes of F. trinervia and F. pringlei. With gene-specific probes the various ppc transcripts could be distinguished unequivocally from one another and the expression patterns of all ppc genes were compared. PpcB and PpcC transcripts of both F. trinervia and F. pringlei were detected preferentially in roots and stems and at low levels in leaves. Their accumulation patterns are thus similar to each other, but different from that of the PpcA genes which in F. trinervia encode the C4 isoform of PEPC. Transgenic analysis of the 5'-flanking regions of the PpcB genes of both F. trinervia and F. pringlei in tobacco revealed that the PpcB promoter/beta-glucuronidase reporter genes were preferentially expressed in the phloem and the roots. Comparison of the PpcB promoter/reporter gene with the accumulation pattern of the PpcB transcripts in F. trinervia and F. pringlei suggests that the expression of the PpcB genes is predominantly controlled by transcription.
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PMID:The phosphoenolpyruvate carboxylase (ppc) gene family of Flaveria trinervia (C4) and F. pringlei (C3): molecular characterization and expression analysis of the ppcB and ppcC genes. 922 54

Phosphoenolpyruvate carboxylase (PEPC), which catalyses the carboxylation of phosphoenolpyruvate using HCO(3)(-) to generate oxaloacetic acid, is an important enzyme in the primary metabolism of plants. Although the PEPC genes (ppc) comprise only a small gene family, the function of each gene is not clear, except for roles in C(4) photosynthesis and CAM. Three PEPC genes (Nsppc1-3) from the C(3) plant Nicotiana sylvestris were used to investigate their roles and regulation in a C(3) plant, and their regulation by phosphorus depletion in particular. First, the induction of PEPC by phosphorus depletion was confirmed. Next, Nsppc1 was determined to be mainly responsive to phosphorus deficiency at the transcriptional level. Further studies using transgenic tobacco harbouring a chimeric gene consisting of the 2.0 kb promoter region of Nsppc1 and the beta-glucuronidase (GUS) reporter showed that PEPC is transcriptionally induced. It was also found that sucrose had a synergistic effect on the induction of PEPC by phosphorus deficiency. A series of transgenic tobacco containing 5'-deletion mutants of Nsppc1 promoter::GUS fusion revealed that the -539 to -442 bp Nsppc1 promoter region, relative to the translation start site, was necessary for the response to phosphorus deficiency. Gain-of-function analysis using a construct containing three tandem repeats of the -539 to -442 bp region confirmed that this region was sufficient to induce the phosphorus-deficiency response in tobacco.
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PMID:Transcriptional activation of phosphoenolpyruvate carboxylase by phosphorus deficiency in tobacco. 1259 67

The methanolic extract of Tephrosia purpurea (Leguminosae) shoots was evaluated in-vitro for its anti-inflammatory and xanthine oxidase inhibitory activity. Anti-inflammatory activity was measured by the Diene-conjugate, HET-CAM and beta-glucuronidase methods. The enzyme inhibitory activity was tested against isolated cow milk xanthine oxidase. The average anti-inflammatory activity of T. purpurea shoot extract in the concentration range of 1-2 microg/mL in the reacting system revealed significant anti-inflammatory activities, which, as recorded by the Diene-conjugate, HET-CAM and beta-glucuronidase assay methods, were 45.4, 10.5, and 70.5%, respectively. Screening of the xanthine oxidase inhibitory activity of the extract in terms of kinetic parameters revealed a mixed type of inhibition, wherein the Km and Vmax values in the presence of 25 to 100 microg/mL shoot extract was 0.20 mM/mL and 0.035, 0.026, 0.023 and 0.020 microg/min, while, for the positive control, the Km and Vmax values were 0.21 mM/mL and 0.043 microg/min, respectively. These findings suggest that T. purpurea shoot extract may possess constituents with good medicinal properties that could be exploited to treat the diseases associated with oxidative stress, xanthine oxidase enzyme activity and inflammation.
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PMID:In vitro anti-inflammatory and xanthine oxidase inhibitory activity of Tephrosia purpurea shoot extract. 2216 76