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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 ...
High-mannose-oligosaccharide β-1,4-N-acetylglucosaminyltransferase (EC 2.4.1.197), uridine diphosphoacetylglucosamine-oligosaccharide acetylglucosaminyltransferase, acetylglucosamine-oligosaccharide acetylglucosaminyltransferase, UDP-GlcNAc:oligosaccharide beta-N-acetylglucosaminyltransferase, UDP-N-acetyl-D-glucosamine:high-mannose-oligosaccharide beta-1,4-N-acetylglucosaminyltransferase) is ...
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 ...
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 ...
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]
Here they form large complexes, both to other proteoglycans, to hyaluronan, and to fibrous matrix proteins, such as collagen. The combination of proteoglycans and collagen form cartilage , a sturdy tissue that is usually heavily hydrated (mostly due to the negatively charged sulfates in the glycosaminoglycan chains of the proteoglycans). [ 5 ]
Hyaladherins, also known as hyaluronan-binding proteins, are proteins capable of binding to hyaluronic acid. Most hyaladherins belong to the Link module superfamily, including its main receptor CD44 , hyalectans and TSG-6 . [ 1 ]
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