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UDP-alpha-D-glucuronate + N-acetyl-beta-D-glucosaminyl-(1-4)-beta-D-glucuronosyl-(1-3)-[nascent hyaluronan]
UDP + beta-D-glucuronosyl-(1-3)-N-acetyl-beta-D-glucosaminyl-(1-4)-beta-D-glucuronosyl-(1-3)-[nascent hyaluronan]
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UDP-alpha-N-acetyl-D-glucosamine + beta-D-glucuronosyl-(1-3)-N-acetyl-beta-D-glucosaminyl-(1-4)-[nascent hyaluronan]
UDP + N-acetyl-beta-D-glucosaminyl-(1-4)-beta-D-glucuronosyl-(1-3)-N-acetyl-beta-D-glucosaminyl-(1-4)-[nascent hyaluronan]
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UDP-N-acetyl-D-glucosamine + UDP-D-glucuronate
[beta-N-acetyl-D-glucosaminyl(1-4)beta-D-glucuronosyl(1-3)]n + UDP
additional information
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UDP-N-acetyl-D-glucosamine + UDP-D-glucuronate
[beta-N-acetyl-D-glucosaminyl(1-4)beta-D-glucuronosyl(1-3)]n + UDP
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UDP-N-acetyl-D-glucosamine + UDP-D-glucuronate
[beta-N-acetyl-D-glucosaminyl(1-4)beta-D-glucuronosyl(1-3)]n + UDP
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hyaluronan synthase 1 and hyaluronan synthase 2 synthesize high molecular weight hyaluronan, while hyaluronan synthase 3 synthesizes low lecular weight hyaluronan
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additional information
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hyaluronan synthase 1 and hyaluronan synthase 2 synthesize high molecular weight hyaluronan, while hyaluronan synthase 3 synthesizes low lecular weight hyaluronan
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additional information
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hyaluronan synthase 1 and hyaluronan synthase 2 synthesize high molecular weight hyaluronan, while hyaluronan synthase 3 synthesizes low lecular weight hyaluronan
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isozyme expression and regulation by interleukin-1beta, progesterone, and low-molecular-weight hyaluronan in pregnant mouse uterine cervix, overview
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regulation mechanism of hyaluronan biosynthesis, stimulation of cells by cytokines effects the different expression patterns of the isoforms, especially during embryonic development, the isozymes have different roles in hyaluronan biosynthesis, isozymes exhibit different functions in tumor growth, progression, and determination of malignancy
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the isozymes form products of different size, HA synthesis modeling, active site and substrate binding site are located on the big cytoplasmic loop
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HA made by the has-1 transduced arterial smooth muscle cells is larger or part of a larger complex that resists proteolytic degradation when compared to the has-3 tansduced ASMCs. There is evidence that the different has enzymes have an inherent ability to regulate hyaluronan size
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additional information
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hyaluronan synthase 1 and hyaluronan synthase 2 synthesize high molecular weight hyaluronan, while hyaluronan synthase 3 synthesizes low lecular weight hyaluronan
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additional information
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hyaluronan synthase 1 and hyaluronan synthase 2 synthesize high molecular weight hyaluronan, while hyaluronan synthase 3 synthesizes low lecular weight hyaluronan
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additional information
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hyaluronan synthase 1 and hyaluronan synthase 2 synthesize high molecular weight hyaluronan, while hyaluronan synthase 3 synthesizes low lecular weight hyaluronan
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evolution
the three HAS isoenzymes, HAS1, HAS2, and HAS3, expressed in mammalian cells differ in their enzymatic properties and regulation by external stimuli
malfunction
Has3/Apoe double deficient mice develop less atherosclerosis characterized by decreased Th1-cell responses, decreased IL-12 release, and decreased macrophage-driven inflammation
metabolism
hyaluronan is expressed in a temporal-spatial expression pattern and may play a role in embryonic tooth morphogenesis. The difference in the distribution and expression of the three hyaluronan synthases at different developmental stages also supports their roles in cell proliferation, cell differentiation and cell migration
evolution
the three HAS isoenzymes, HAS1, HAS2, and HAS3, expressed in mammalian cells differ in their enzymatic properties and regulation by external stimuli
physiological function
hyaluronan is the largest and one of the most abundant glycosaminoglycans of the extracellular space. Hyaluronan synthases are glycosyltransferases acting on the inner face of plasma membrane, adding alternately glucuronic acid and N-acetylglucosamine to the reducing end of the growing chain. Hyaluronan synthase forms a reserve that is transported to the plasma membrane for rapid activation of hyaluronan synthesis. The levels and localizations of HAS isoforms are likely to be highly important in processes like embryonic development, wound healing, inflammation, and malignant growth
physiological function
hyaluronan synthase 3 promotes plaque inflammation and atheroprogression. Hyaluronan synthase 3 expression in vascular smooth muscle cells is found to be regulated by interleukin 1 beta (IL-1beta) in an NFkappaB dependent manner
malfunction
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catalytically inactive mutant K190R HAS2 forms dimers with wild-type HAS2 and quenches the activity of wild-type HAS2
malfunction
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HAS-1 overexpression in dermal wounds decreases elements of scar formation
malfunction
downregulation of HAS2 initiates and regulates fibroblast senescence through a p27-CDK2-SKP2 pathway. Deletion of HAS2 in mouse mesenchymal cells increases the cellular senescence of fibroblasts in bleomycin-induced mouse lung fibrosis in vivo. Overexpression of HAS2 in mesenchymal cells promotes an invasive phenotype resulting in severe fibrosis and downregulation of HAS2 promotes resolution. HAS2 deficiency leads to embryonic lethality. Downregulation of HAS2 increases p27 protein stability. p27 inhibits cell proliferation by regulating CDK2 activity. HAS2 deletion enhances cell stress responses. Phenotypes, detailed overview
malfunction
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in a ligation-induced carotid artery injury model, attenuated neointimal hyperplasia occurs in HAS3-null animals compared with wild-type control C57BL/6J mice. No changes are observed in medial and neointimal cell density, proliferation, or apoptosis. A lack of compensatory upregulation of isozymes HAS1 or HAS2, HAS3 deletion is associated with a reduction in vascular hyaluronan content, most dramatically in the media rather than the neointima. Transcriptome analysis of injured vessels from wild-type and HAS3-null mice reveals differential activation of pathways associated with a migratory VSMC phenotype. Isozyme HAS3 overexpression in VSMCs supports a migratory phenotype in response to platelet-derived growth factor BB (PDGF-BB), whereas knockdown of HAS3 results in reduced PDGF-BB-induced migration. Isozyme HAS3 knockdown also leads to a decrease in PDGF-B mRNA levels
malfunction
Has2-/- mice are embryonic lethal. Has2-/- embryos die between embryonic day 9.5 and 10.5 and exhibit severe cardiac and vascular abnormalities, in addition to yolk sac and somite deformities
metabolism
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role of hyaluronan in vascular disease, a multitude of synthases (HAS1, HAS2, and HAS3) and multiple hyaluronidases are involved in its metabolism
metabolism
hyaluronan is expressed in a temporal-spatial expression pattern and may play a role in embryonic tooth morphogenesis. The difference in the distribution and expression of the three hyaluronan synthases at different developmental stages also supports their roles in cell proliferation, cell differentiation and cell migration
metabolism
hyaluronan synthase 2 expression is elevated in both human and murine liver fibrosis. The enzyme actively synthesizes hyaluronan in hepatic stellate cells and promotes activation of hepatic stellate cells and liver fibrosis through Notch1
physiological function
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HAS-1 treatment of wounds promotes a more organized extracellular matrix with the regeneration of dermal appendages, including hair follicles, increased regenerative healing, overview
physiological function
hyaluronan is the largest and one of the most abundant glycosaminoglycans of the extracellular space. Hyaluronan synthases are glycosyltransferases acting on the inner face of plasma membrane, adding alternately glucuronic acid and N-acetylglucosamine to the reducing end of the growing chain. Hyaluronan synthase forms a reserve that is transported to the plasma membrane for rapid activation of hyaluronan synthesis. The levels and localizations of HAS isoforms are likely to be highly important in processes like embryonic development, wound healing, inflammation, and malignant growth
physiological function
hyaluronan synthase 2 regulates fibroblast senescence in pulmonary fibrosis. Senescence is implicated in development, cancer, and tissue fibrosis. The chronic inflammation caused by cellular senescence may be related to the pathogenesis of various chronic diseases. Isozyme HAS2 may be a critical regulator of the fate of pulmonary fibrosis. Isozyme HAS2 is the major isoform responsible for hyaluronan production in mesenchymal cells
physiological function
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hyaluronan synthase isozymes are involved in hyaluronan biosynthesis. Each HAS isoform produces structurally identical hyaluronan, thus, hyaluronan function is independent of the HAS by which it is synthesized. Hyaluronan is an essential component of the pericellular matrix, or alternatively, it can be released in a soluble form and be released and incorporated as part of the extracellular matrix. The composition and architecture of the matrix affect hyaluronan-dependent biochemical signaling, as well as the biophysical and biomechanical properties of tissues. The temporal and spatial relationship of hyaluronan with cells that express hyaluronidases that modify the molecular weight of hyaluronan is another determinant of hyaluronan function. Hyaluronan synthases may affect vascular disease independent of hyaluronan. HAS isoform-specific functions in tissue homeostasis and disease. Apotential autocrine loop involving isoyzme HAS3, PDGF-B expression, and PDGF-BB-induced migration. Isoform-specific role for HAS3 in promoting neointimal hyperplasia after carotid artery ligation
physiological function
recombinant hyaluronan synthase-2 upregulation protects smpd3-deficient fibroblasts against cell death induced by nutrient deprivation, but not against apoptosis evoked by human oxidized LDL. Resistance of fro/fro cells to starvation-induced apoptosis is associated with an increased expression of hyaluronan synthase 2 (HAS2) mRNAs and protein, which is inhibited by ceramide. The protective mechanism of HAS2 involves an increased expression of the heat-shock protein Hsp72, a chaperone with antiapoptotic activity. Antiapoptotic properties of HAS2 , overview
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Spicer, A.P.; Augustine, M.L.; McDonald, J.A.
Molecular cloning and characterization of a putative mouse hyaluronan synthase
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206
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