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HAS1 is a member of the newly identified vertebrate gene family encoding putative hyaluronan synthases, and its amino acid sequence shows significant homology to the hasA gene product of Streptococcus pyogenes, a glycosaminoglycan synthetase (DG42) from Xenopus laevis, and a recently described murine hyaluronan synthase.
There are three mammalian hyaluronan synthases described to date - HAS1, HAS2, and HAS3. Each of these isoforms resides at a different chromosome location [ 2 ] and has been cloned . [ 3 ] Two of the main differences between the isoforms are the chain length of the hyaluronan molecules that they produce and the ease with which they can be ...
In enzymology, an alpha-N-acetylgalactosaminide alpha-2,6-sialyltransferase (EC 2.4.3.3) is an enzyme that catalyzes the chemical reaction. CMP-N-acetylneuraminate + glycano-1,3-(N-acetyl-alpha-D-galactosaminyl)-glycoprotein CMP + glycano-(2,6-alpha-N-acetylneuraminyl)-(N-acetyl-D-galactosaminyl)- glycoprotein
Hyaluronic acid is synthesized by a class of integral membrane proteins called hyaluronan synthases, of which vertebrates have three types: HAS1, HAS2, and HAS3. These enzymes lengthen hyaluronan by repeatedly adding D -glucuronic acid and N -acetyl- D -glucosamine to the nascent polysaccharide as it is extruded via ABC-transporter through the ...
Hyaluronan synthase, that is a membrane-binding enzyme, is one of the factors that reduces the production of HA. Hyaluronan synthase limits hyaluronic acid production by affecting cell morphology. Hyaluronan synthase limits hyaluronic acid production by affecting cell morphology.
In enzymology, a N-acetyllactosaminide beta-1,6-N-acetylglucosaminyl-transferase (EC 2.4.1.150) is an enzyme that catalyzes the chemical reaction. UDP-N-acetyl-D-glucosamine + beta-D-galactosyl-1,4-N-acetyl-D-glucosaminyl-R UDP + N-acetyl-beta-D-glucosaminyl-1,6-beta-D-galactosyl-1,4-N-acetyl-D- glucosaminyl-R
The reason for this apparent contradiction is that both the accumulation of hyaluronic acid (due to increased hyaluronan synthase levels and decreased HYAL levels) and the degradation of hyaluronic acid into hyaluronic acid oligosaccharides by high HYAL levels result in increased tumor malignancy.
Hyaluronan synthase 2 is an enzyme that in humans is encoded by the HAS2 gene. [ 5 ] [ 6 ] Hyaluronan or hyaluronic acid is a high molecular weight unbranched polysaccharide synthesized by a wide variety of organisms from bacteria to mammals, and is a constituent of the extracellular matrix .
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