A two‐step synthesis of engineered variants of Talaromyces flavus β‐N‐acetylhexosaminidase (TfHexY470N) and human β4‐galactosyltransferase (β4GalTY284L) yielded complex glycans comprising a chitooligomeric spacer (β1,4GlcNAc)n=0–3 terminated with a β4‐linked β‐d‐N‐acetylgalactosamine‐(1→4)‐d‐N‐acetylglucosamine (LacdiNAc) epitope. These compounds are novel inhibitors of human galectin‐3 (Gal‐3), a
concept for the synthesis of branched N‐acetyllactosamine (LacNAc) glycan structures. Through a combination of sequential enzymatic and chemical reactions of Leloir‐glycosyltransferases, galactose oxidase and reductive amination, we obtained branched glycan oligomers with a variation of LacNAc and/or N′,N′′‐diacetyllactosamine (LacdiNAc) glycan epitopes. Incorporation of a branchingpoint was accomplished
Repeats of the disaccharide unit N-acetyllactosamine (LacNAc) occur as type 1 (Galβ1, 3GlcNAc) and type 2 (Galβ1, 4GlcNAc) glycosylation motifs on glycoproteins and glycolipids. The LacNAc motif acts as binding ligand for lectins and is involved in many biological recognition events. To the best of our knowledge, we present, for the first time, the synthesis of LacNAc type 1 oligomers using recombinant
technique afforded linear polymer precursors with comparable molecular weight (Mn ≈ 22,000 g mol-1) and narrow dispersity (D̵ ≈ 1.1). The precursors were conjugated with the functionalized LacNAc disaccharide (4-22 mol % content in glycopolymer) prepared by enzymatic synthesis under catalysis by β-galactosidase from Bacillus circulans. The structure-affinity relationship study based on the enzyme-linked
N-乙酰半乳糖胺(LacNAc;Galβ4GlcNAc)是半乳凝素的典型二糖配体。这些人类凝集素中最丰富的成员,galectin-1(Gal-1)和galectin-3(Gal-3)参与了许多病理过程,包括癌变和转移形成。在这项研究中,我们合成了一系列十五种具有不同LacNAc含量和表现形式的N-(2-羟丙基)甲基丙烯酰胺(HPMA)基糖聚合物,并评估了其结构对与Gal-1和Gal-3结合的亲和力的影响。受控的自由基可逆的加成-断裂链转移共聚技术提供了具有可比较的分子量(Mn≈22,000 g mol-1)和窄分散性(D̵≈1.1)的线性聚合物前体。将前体与功能化的LacNAc二糖(糖聚合物中含量为4-22mol%)缀合,所述糖化酶是由来自圆形芽孢杆菌的β-半乳糖苷酶催化合成的。基于酶联免疫吸附测定的结构亲和关系研究表明,LacNAc呈递的类型(单个或成簇在二价或三价接头上)可对Gal-1
[EN] GLYCOPOLYMER, METHOD OF PREPARATION THEREOF, USE THEREOF AS MEDICAMENT<br/>[FR] GLYCOPOLYMÈRE, SON PROCÉDÉ DE PRÉPARATION, SON UTILISATION EN TANT QUE MÉDICAMENT
申请人:USTAV MAKROMOLEKULARNI CHEMIE AV CR V V I
公开号:WO2021047699A1
公开(公告)日:2021-03-18
The invention relates to multivalent glycopolymers based on HPMA polymers (copolymers or homopolymers) with carbohydrate structures containing a terminal monosaccharide in the galacto-configuration, which are effective as galectin inhibitors. These glycopolymers can be used as drugs for the therapy and prevention of oncological diseases associated with overproduction of galectins, especially of human galectin-3 (Gal-3).