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Recognition profile of Morus nigra agglutinin (Morniga G) expressed by monomeric ligands, simple clusters and mammalian polyvalent glycotopes.

Abstract：

:The carbohydrate binding properties of a novel member of the subfamily of galactose-specific jacalin-related lectin isolated from the bark of black mulberry (Morus nigra) (Morniga G) was studied in detail by enzyme-linked lectinosorbent and inhibition assays using panels of monomeric saccharides, mammalian polyvalent glycotopes and polysaccharides. Among the natural glycans tested for lectin binding, Morniga G reacted best with glycoproteins (gps) presenting a high density of tumor-associated carbohydrate antigens Tn (GalNAcalpha1-Ser/Thr) and Talpha (Galbeta1-3GalNAcalpha1-). Their reactivities, on a nanogram basis, were up to 72.5, 3.9x10(3), 6.0x10(3), 8.8x10(3) and 2.9x10(4) times higher than that of Tn-containing glycopeptides (M.W.<3000 Da), monomeric T, Tn, GalNAc and Gal, respectively. It also reacted well with many multi-antennary N-glycans with II (Galbeta1-4GlcNAc) termini, ABH histo-blood group antigens and their precursors containing high densities of I/II and T/Tn glycotopes, and sialylated T/Tn. Among the mono-, di- and oligosaccharides tested, Thomsen-Friedenreich (T) disaccharide with aromatic aglycon [Galbeta1-3GalNAcalpha1-benzyl (Talpha1-benzyl)] and Tn glycopeptides were the best inhibitors. Molecular modeling and docking studies indicated the occurrence of a primary GalNAcalpha1- and Galbeta1-3GalNAc glycotope-binding site in Morniga G. Using a recently proposed system [Wu, A.M., 2003. Carbohydrate structural units in glycoproteins and polysaccharides as important ligands for Gal and GalNAc reactive lectins. J. Biomed. Sci. 10, 676-688], the binding properties of the combining sites of Morniga G can be defined as follows: (i) the monosaccharide specificity is GalNAc/Gal>Man/Glc, GlcNAc and lFuc; (ii) the mammalian glycotope specificity is Talpha1-benzyl>T>Tn>GalNAcbeta1-3Gal (P), while B/E (Galalpha1-3/4Gal), I/II (Galbeta1-3/4GlcNAc), S (GalNAcbeta1-4Gal), F/A (GalNAcalpha1-3GalNAc/Gal) and L (Galbeta1-4Glc) are inactive; (iii) the most active ligand is T/Tn; (iv) simple clustered Tn or triantennary N-glycans with II termini (Tri-II) have limited impact; (v) high-density polyvalent glycotopes play a prominent role for enhancing Morniga G reactivity. These results provide evidence for the binding of this lectin to dense cell surface T/Tn glycoconjugates and facilitate future usage of this lectin in biotechnological and medical applications.

journal_name

Mol Immunol

journal_title

Molecular immunology

authors

Singh T,Wu JH,Peumans WJ,Rougé P,Van Damme EJ,Wu AM

doi

10.1016/j.molimm.2006.02.017

subject

Has Abstract

pub_date

2007-01-01 00:00:00

pages

451-62

issue

4

eissn

0161-5890

issn

1872-9142

pii

S0161-5890(06)00069-1

journal_volume

44

pub_type

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