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Страна 1 од 423 резултати
Overexpression of PH-4, a novel putative proline 4-hydroxylase, modulates activity of hypoxia-inducible transcription factors.
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Hypoxia-inducible transcription factors (HIFs) are important for transcriptional adaptation to hypoxia. Availability of HIFs is regulated via posttranslational modification of their alpha subunits (HIF-1alpha and HIF-2alpha). Under normoxia, two highly conserved proline residues within the
Many amino acid substitutions in a hypoxia-inducible transcription factor (HIF)-1alpha-like peptide cause only minor changes in its hydroxylation by the HIF prolyl 4-hydroxylases: substitution of 3,4-dehydroproline or azetidine-2-carboxylic acid for the proline leads to a high rate of uncoupled 2-oxoglutarate decarboxylation.
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Three human prolyl 4-hydroxylases (P4Hs) regulate the hypoxia-inducible transcription factors (HIFs) by hydroxylating a Leu-Xaa-Xaa-Leu-Ala-Pro motif. We report here that the two leucines in the Leu-Glu-Met-Leu-Ala-Pro core motif of a 20-residue peptide corresponding to the sequence around Pro(564)
The p53 codon 72 proline allele is endowed with enhanced cell-death inducing potential in cancer cells exposed to hypoxia.
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The preferential retention of the arginine allele at the p53 codon 72 locus is commonly observed in tumours from arginine/proline heterozygotes. Considering that cancer cells are harboured in a hypoxic environment in vivo, we here tested the hypothesis that the p53 codon 72 proline allele confers a
Proline-hydroxylated hypoxia-inducible factor 1α (HIF-1α) upregulation in human tumours.
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The stabilisation of HIF-α is central to the transcriptional response of animals to hypoxia, regulating the expression of hundreds of genes including those involved in angiogenesis, metabolism and metastasis. HIF-α is degraded under normoxic conditions by proline hydroxylation, which allows for
Downregulation of Proline Hydroxylase 2 and Upregulation of Hypoxia-Inducible Factor 1α are Associated with Endometrial Cancer Aggressiveness.
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Proline-rich tyrosine kinase 2 downregulates peroxisome proliferator-activated receptor gamma to promote hypoxia-induced pulmonary artery smooth muscle cell proliferation.
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Hypoxia stimulates pulmonary hypertension (PH), in part by increasing the proliferation of human pulmonary artery smooth muscle cells (HPASMCs) via sustained activation of mitogen-activated protein kinase, extracellular signal-regulated kinases 1 and 2 (ERK 1/2), and nuclear factor-kappa B (NF-κB);
Cloning and characterization of a low molecular weight prolyl 4-hydroxylase from Arabidopsis thaliana. Effective hydroxylation of proline-rich, collagen-like, and hypoxia-inducible transcription factor alpha-like peptides.
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4-Hydroxyproline is found in collagens and collagen-like proteins in animals and in many glycoproteins in plants. Animal prolyl 4-hydroxylases (P4Hs) have been cloned and characterized from many sources, but no plant P4H has been cloned so far. We report here that the genome of Arabidopsis thaliana
The von Hippel Lindau/hypoxia-inducible factor (HIF) pathway regulates the transcription of the HIF-proline hydroxylase genes in response to low oxygen.
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Most of the genes induced by hypoxia are regulated by a family of transcription factors termed hypoxia-inducible factors (HIF). Under normoxic conditions, HIFalpha proteins are very unstable due to hydroxylation by a recently described family of proline hydroxylases termed EGL-Nine homologs (EGLN).
Proline dehydrogenase (oxidase), a mitochondrial tumor suppressor, and autophagy under the hypoxia microenvironment.
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Proline dehydrogenase (oxidase, PRODH/POX), the first enzyme in the pathway of proline catabolism, has been identified as a mitochondrial, metabolic tumor suppressor, which is downregulated in a variety of human tumors. However, our recent findings show that PRODH/POX is upregulated by hypoxia in
Elongation Factor 2 Kinase Is Regulated by Proline Hydroxylation and Protects Cells during Hypoxia.
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Protein synthesis, especially translation elongation, requires large amounts of energy, which is often generated by oxidative metabolism. Elongation is controlled by phosphorylation of eukaryotic elongation factor 2 (eEF2), which inhibits its activity and is catalyzed by eEF2 kinase (eEF2K), a
Regulation of proline metabolism in mycobacteria and its role in carbon metabolism under hypoxia.
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Genes with a role in proline metabolism are strongly expressed when mycobacterial cells are exposed to nutrient starvation and hypoxia. Here we show that proline metabolism in mycobacteria is mediated by the monofunctional enzymes Δ(1) -pyrroline-5-carboxylate dehydrogenase (PruA) and proline
FGF23 expression in rodents is directly induced via erythropoietin after inhibition of hypoxia inducible factor proline hydroxylase.
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Plasma levels of FGF23 are increased in patients with chronic kidney disease. Beside its role in phosphate homeostasis, iron deficiency and anemia are associated with increased FGF23 plasma levels. Recently, FGF23 plasma levels were shown to be increased in mice after treatment with hypoxia
Proline hydroxylation at different sites in hypoxia-inducible factor 1α modulates its interactions with the von Hippel-Lindau tumor suppressor protein.
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Hypoxia-inducible factor 1 (HIF-1) plays an essential role in the regulation of hypoxia in humans. This regulation is mediated by the interaction of the von Hippel-Lindau tumor suppressor protein (pVHL) with the hydroxylated HIF-1α at proline564 (Pro564). Experimental studies reported that Pro567
Aortic proline hydroxylase in hypoxia induced arteriosclerosis in rabbits.
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Studies on hypoxia. II. Autoradiographic quantitation of proline-3H incorporation by connective tissue cells of the neonatal hamster.
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