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-Structure paper
| タイトル | Structural and Functional Analysis of Heparosan Synthase 2 from (PmHS2) to Improve the Synthesis of Heparin. |
|---|---|
| ジャーナル・号・ページ | ACS Catal, Vol. 14, Issue 9, Page 6577-6588, Year 2024 |
| 掲載日 | 2024年5月3日 |
著者 | Eduardo Stancanelli / Juno A Krahn / Elizabeth Viverette / Robert Dutcher / Vijayakanth Pagadala / Mario J Borgnia / Jian Liu / Lars C Pedersen / ![]() |
| PubMed 要旨 | Heparin is a widely used drug to treat thrombotic disorders in hospitals. Heparosan synthase 2 from (PmHS2) is a key enzyme used for the chemoenzymatic synthesis of heparin oligosaccharides. It has ...Heparin is a widely used drug to treat thrombotic disorders in hospitals. Heparosan synthase 2 from (PmHS2) is a key enzyme used for the chemoenzymatic synthesis of heparin oligosaccharides. It has both activities: glucosaminyl transferase activity and glucuronyl transferase activity; however, the mechanism to carry out the glyco-oligomerization is unknown. Here, we report crystal structures of PmHS2 constructs with bound uridine diphosphate (UDP) and a cryo-EM structure of PmHS2 in complex with UDP and a heptasaccharide (NS 7-mer) substrate. Using a LC-MC analytical method, we discovered the enzyme displays both a two-step concerted oligomerization mode and a distributive oligomerization mode depending on the non-reducing end of the starting oligosaccharide primer. Removal of 7 amino acid residues from the C-terminus results in an enzymatically active monomer instead of dimer and loses the concerted oligomerization mode of activity. In addition, the monomer construct can transfer N-acetyl glucosamine at a substrate concentration that is ∼7-fold higher than wildtype enzyme. It was also determined that an F529A mutant can transfer an N-sulfo glucosamine (GlcNS) saccharide from a previously inactive UDP-GlcNS donor. Performing the glyco-transfer reaction at a high substrate concentration and the capability of using unnatural donors are desirable to simplify the chemoenzymatic synthesis to prepare heparin-based therapeutics. |
リンク | ACS Catal / PubMed:39990868 / PubMed Central |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 1.982 - 3.3 Å |
| 構造データ | EMDB-43269, PDB-8viw: ![]() PDB-8vh7: ![]() PDB-8vh8: |
| 化合物 | ![]() ChemComp-MN: ![]() ChemComp-UDP: ![]() ChemComp-EDO: ![]() ChemComp-NA: ![]() ChemComp-HOH: ![]() ChemComp-CL: ![]() ChemComp-CA: |
| 由来 |
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キーワード | TRANSFERASE / glycosyltransferase / heparosan / chemoenzymatic synthesis / heparan sulfate / polysaccharide synthase / complex |
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pasteurella multocida (バクテリア)
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