Glycobiological interaction studies – a key for the understanding of exopolysaccharide behavior and biofilm formation.

Recently, the group of Parsek have published a study about the function of the exopolysaccharide (PsI) found in Pseudomonas aeruginosa and its interaction with the bacterial lectin LecB that induce stabilisation of the biofilm. This work justifies the interest of glycobiological interactions studies that enable to answer and explain some stayed unknown mecanisms up to now. The expertise of GLYcoDiag in this field is now well known through the GLYcoPROFILE technology platform which is adapted for bacteria-cells glycobiological interactions studies.

Learn more about GLYcoPROFILE

Passos da Silva, D., Matwichuk, M. L., Townsend, D. O., Reichhardt, C., Lamba, D., Wozniak, D. J., Parsek, M. R., Nat. Comm., 2019, 10, 2183 (DOI : 10,1038/s41467-019-10201-4)


Neoglycoproteins are glycosylated bovine serum albumin (BSA) molecules. In order to improve accessibility and avidity of a carbohydrate-binding proteins, a new version of neoglycoproteins containing spacer arm (i.e. an alkyl spacer or a polyethylene glycol (PEG) chain), were developped and proposed either with monosaccharides/disaccharides or with glycoclusters.

Musa acuminata (BanLec) lectin an original Mannose binding lectin

Musa acuminata lectin (BanLec) is isolated from banana pulp and purified by affinity column chromatography on CarbPROFILE Mannose (see below the focus on GLYcoDiag affinity gel). The  carbohydrate recognition domain of BanLec is mainly specific for mannose. BanLec is available in 2 to 5 mg unlabelled or labelled with biotin or fluorescein.

GLYcoDiag lectin BanLec v1.1

GLYcoPROFILE® makes the news! GLYcoPROFILE was used by Seqens and reported in In-Cosmetics 2019

GLYcoDiag is pround to report that its technology of GLYcoPROFILE® have recently allowed to highlight glycobiological interactions of the cosmetic active Glycuron™ 2.78, developed by Seqens. Thanks to the curious and innovative team spirit of Seqens and their kind attention for mentionning GLYcoDiag through their communication.
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Tulipa gesneriana agglutinin (TXLC-I) a Gal/GalNAc lectin is now available

Tulipa gesneriana agglutinin (TxLC-I) is isolated from tulip bulbs and purified by affinity column chromatography on a Fetuin-Sepharose 4B gel. TxLC-I was originally described as a tetramer of four identical subunits of 28 kDa. Then, after amino acid sequence analyses, this subunit seems to be partialy cleaved into two smaller polypeptides of approximatively 14 kDa each. TxLC-I have a Gal/GalNAc binding domain and show highest affinity to triantennary carbohydrates and diantennary oligosaccharide with Gal residues.
GLYcoDiag lectin TxLC-I v1.2

GLYcoDiag participate to a research collaboration aimed at the study of new lectin ligands

H. Prasch, C. Hojnik, T. K. Lindhorst, B. Didak, L. Landemarre, T. M. Wrodnigg. New lectin ligands: Testing of Amadori rearrangement products with a series of mannoside-specific lectins, Carbohydr. Res., 2019, accepted manuscript (DOI: 10.1016/j.carres.2019.01.010).

C-glycosyl-type compounds derived from an Amadori rearrangement: D-glycero-D-galacto-aldoheptose and the two corresponding multivalent BSA neoglycoproteins, were evaluated as ligands on a series of seven relevant mannose-specific lectins. The evaluation of the IC50-value (concentration corresponding to 50% of inhibition) of the compounds has been evaluated. Multivalency turned out to effectively influence ligand selectivity and lectin binding.

GLYcoDiag participate to a research collaboration aimed at the study of sialidases and multivalent thiosialosides

Brissonnet, Y., Assailly, C. Saumonneau, A., Bouckaert, J., Maillasson, M., Petito, C., Roubinet, B., Didak, B., Landemarre, L., Bridot, C., Blossey, R., Deniaud, D., Yan, X., Bernard, J. Tellier, C., Grandjean, C., Daligault, F., Gouin, S. G., Multivalent thiosialosides and their synergistic interaction with pathogenic sialidases, Chem. Eur. J., accepted article (DOI: 10.1002/chem.201805790)

Sialidases (SA) hydrolyze sialyl residues from glycoconjugates of the eukaryotic cell surface and are virulence factors expressed by pathogenic bacteria, viruses and parasites. The catalytic domain of SA are often flanked with carbohydrate-binding module(s) previously shown to bind sialosides and to enhance enzymatic catalytic efficiency. Here we designed non-hydrolyzable multivalent thiosialosides as probes and inhibitors of V. cholerae, T. cruzi and S. pneumoniae (NanA) sialidases. NanA was truncated from the catalytic and lectinic domains (NanA-L and NanA-C) to probe their respective roles when interacting with sialylated surfaces and the synthetically designed di-, and polymeric thiosialosides. NanA-L domain was shown to fully drive NanA binding, improving affinity for the thiosialylated surface and compounds by more than two orders of magnitude. Importantly, each thiosialoside grafted onto the polymer was also shown to reduce NanA and NanA-C catalytic activity with a 3000-fold higher efficiency compared to the monovalent thiosialoside reference. These results extend the concept of multivalency for designing potent bacterial and parasitic sialidase inhibitors.

GLYcoDiag will be attending In-cosmetics, Paris, 2-4 april 2019

Heading into its 30th edition in 2019, in-cosmetics Global is the leading event for personal care ingredients. The exhibition brings together personal care ingredients suppliers (exhibitors) with finished product manufacturers (visitors), each looking to network, learn about future trends, and discover new products.

We are pleased to invite you to meet us on our booth and discuss about our glycosciences and microbiote services and innovation strategies:

We provide added value in terms of innovation, originality and scientific proofs for the research and development of “glycoactives”

– Our technology platform GLYcoPROFILE® is intended for biological activities prediction through the study of skin cells, microbiote and involvement of glycosylated molecules in the natural glycobiological interactions relevant for cosmetics applications.

– High throughput and/or alternative methods aimed to study microbiote activities of products. Activities comparison on various strains (either isolated or mixed in co-culture models. Prebiotics or, on the contrary, anti-microbials effects.

– Microbiote / glycobiological interactions studies. As a research company specialized in Glycosciences, we have a strong know-how regarding the interactions between microbiote and cutaneous cells mediated by lectins (lectins-like)-glycoconjugates recognitions.