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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 ...
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 ...
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Hyaluronan (-4GlcUAβ1-3GlcNAcβ1-) n. The fourth class of GAG, hyaluronic acid (HA), is not sulfated and is synthesized by three transmembrane synthase proteins HAS1, HAS2, and HAS3. HA, a linear polysaccharide, is composed of repeating disaccharide units of →4)GlcAβ(1→3)GlcNAcβ(1→ and has a very high molecular mass, ranging from 10 5 ...
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 .
On the other hand, some enzymes induce HA production like sucrose-6-phosphatate hydrolase, [27] and hyaluronan synthase. [28] Using combined approaches with these two type enzymes is a good strategy for high yield HA production. [21]
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.
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