[Selectin receptors. 2. Synthesis of HSO3-3'Le(a)--a sulfated ligand of the cell adhesion molecule, E-selectin]. / Retseptory selektinov. 2. Sintez HSO3-3'Le(a)--sul'fatirovannogo ligandamolekuly kletochnoi adgezii, E-selektina.

HSO3-3'Gal beta 1-3(Fuc alpha 1-4)GlcNAc beta 1-O(CH2)3NH2 was synthesized by selective sulfation (Py.SO3/Py, O degree C) of a protected trisaccharide Lea derivative bearing unsubstituted hydroxyls at C2 and C3 of the galactose moiety, BdGal beta 1-3(Bn3Fuc alpha 1-4)6-BnGlcNAc beta 1-O(CH2)3NHCOCF3, followed by convenient deprotection. A monosaccharide derivative, HSO3-3Gal beta 1-O(CH2)3NH2, was also obtained in a similar way. Coupling of the aminopropyl glycosides with poly(4-nitrophenylacrylate) gave rise to polyacrylamide (PAA) conjugates; biotinylated probes of the Sug-PAA-biotin type were obtained as well.

[Synthesis of thioacetamide analogs of blood group specific trisaccharide A and its fragments]. / Sintez tioatsetamidnykh analogov gruppospetsificheskogo trisakharida krovi A i ego fragmentov.

The determinant trisaccharide of the blood group A, GalNAc alpha 1-3(Fuc alpha 1-2)Gal beta, was modified by treatment of the trisaccharide acetate with phosphorus pentasulphide to convert its acetamide fragment determining the serological difference between antigenic determinants A and B into the thioacetamide derivative. Thionated analogues of the A disaccharide and of GalNAc alpha-glycoside were obtained in a similar way. Interaction of three monoclonal anti-A antibodies with modified antigens was studied using ELISA, the O-->S replacement allowing to evaluate the contribution of the acetamido carbonyl group into the antigen-antibody interaction.

[Epitope specificity of hemagglutinating monoclonal anti-B antibodies]. / Epitopnaia spetsifichnost' gemaggliutiniruiushchikh monoklonal'nykh anti-B-antitel.

Fine epitope specificity of ten monoclonal antibodies (MA) agglutinating red blood cells B was studied. Three methods were used: 1) inhibition of MA binding to natural antigen by synthetic oligosaccharides (OS) and their polyacrylamide conjugates, 2) direct MA binding to a series of synthetic OS-polyacrylamide conjugates differing in carbohydrate epitope density, 3) direct MA binding to the affinity sorbents. It is shown that all antibodies studied prefer trisaccharide B determinant Gal alpha 1-3(Fuc alpha 1-2) Gal independently of their ability to discriminate serological subgroups of B erythrocytes (B, Bweak, B3). The correlation of the MAs epitope specificity with their ability to agglutinate red blood cells B subgroups is discussed. Of an interest is that MAs which are able to agglutinate any B subgroups also bing the synthetic tetrasaccharide Gal alpha 1-3(Fuc alpha 1-2)Gal beta 1-3GalNAc, a B type 3 determinant.

[Synthesis of oligosaccharides with group specificity for blood types A, B and H (Type 3)]. / Sintez oligosakharidov s gruppovoi spetsifichenost'iu krovi A, B i H (tip 3).

Chemical synthesis of A, B, and H (type 3) human blood group determinant oligosaccharides (as R-glycosides, R = OCH2CH2CH2NHCOCF3) and their polymeric derivatives are reported. 4,6; 4',6'-Di-O-benzylidene derivative of Gal beta 1----3GalNAc alpha 1----R was chloroacetylated selectively at 3'-OH, the chloroacetate was alpha-fucosylated and dechloroacetylated to give protected H (type 3) trisaccharide bearing free 3'-OH. alpha-Glycosylation of the trisaccharide with 2-azido-3,4,6-tri-O-benzyl-beta-D-galactopyranosyl chloride and 2,3,4,6-tetra-O-benzyl-alpha-D-galactopyranosyl bromide gave rise to protected A and B tetrasaccharides, respectively. Deprotected R-glycosides were converted to OCH2CH2CH2NH2 derivatives. Their reaction with poly(4-nitrophenylacrylate) affords polyacrylamide-coupled conjugates with A, B, and H (type 3) specificity.

[Isomerization of trifluoroacetamidopropyl-2-acetamido-2-deoxy-D- galactopyranoside into alpha-anomer. A convenient method of synthesis of the artificial T-antigen]. / Izomerizatsiia triftoratsetamidopropil-2-atsetamido-2-dezoksi-beta- D-galaktopiranozida v alpha-anomer. Udobnyi metod sinteza iskusstvennogo T-antigena.

Bioside Gal beta 1-3GalNAc alpha 1-O(CH2)3NHCOCF3 has been synthesized. The key alpha-glycoside GalNAc alpha 1-O(CH2)3NHCOCF3 (peracetate) was obtained either by isomerization of its beta-anomer with trifluoromethanesulfonic acid, or by direct glycosylation of 3-(trifluoroacetamido)propanol with D-galactosamine (anomeric pentaacetate) in the presence of a mixture of trifluoromethanesulfonic acid and boron trifluoride etherate. De-O-acetylated alpha-galactosaminide obtained was further transformed into benzylidene derivative, the latter was glycosylated with acetobromogalactose to give the protected alpha-bioside. The removal of the protecting groups gave the (3-aminopropyl)-alpha-bioside, which was subsequently immobilized on bovine serum albumin and cytochrome c.