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Molecules 2017, 22(9), 1572; doi:10.3390/molecules22091572

Studying the Structural Significance of Galectin Design by Playing a Modular Puzzle: Homodimer Generation from Human Tandem-Repeat-Type (Heterodimeric) Galectin-8 by Domain Shuffling

1
Institut für Physiologische Chemie, Tierärztliche Fakultät, Ludwig-Maximilians-Universität, Veterinärstraße 13, 80539 München, Germany
2
Abteilung für Angewandte Tumorbiologie, Pathologisches Institut, Klinikum der Ruprecht-Karls-Universität, Im Neuenheimer Feld 224, 69120 Heidelberg, Germany
3
Shemyakin & Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, ul Miklukho-Maklaya 16/10, Moscow 117997, Russia
*
Authors to whom correspondence should be addressed.
Received: 30 August 2017 / Accepted: 17 September 2017 / Published: 19 September 2017
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Abstract

Tissue lectins are emerging (patho)physiological effectors with broad significance. The capacity of adhesion/growth-regulatory galectins to form functional complexes with distinct cellular glycoconjugates is based on molecular selection of matching partners. Engineering of variants by changing the topological display of carbohydrate recognition domains (CRDs) provides tools to understand the inherent specificity of the functional pairing. We here illustrate its practical implementation in the case of human tandem-repeat-type galectin-8 (Gal-8). It is termed Gal-8 (NC) due to presence of two different CRDs at the N- and C-terminal positions. Gal-8N exhibits exceptionally high affinity for 3′-sialylated/sulfated β-galactosides. This protein is turned into a new homodimer, i.e., Gal-8 (NN), by engineering. The product maintained activity for lactose-inhibitable binding of glycans and glycoproteins. Preferential association with 3′-sialylated/sulfated (and 6-sulfated) β-galactosides was seen by glycan-array analysis when compared to the wild-type protein, which also strongly bound to ABH-type epitopes. Agglutination of erythrocytes documented functional bivalency. This result substantiates the potential for comparative functional studies between the variant and natural Gal-8 (NC)/Gal-8N. View Full-Text
Keywords: adhesion; glycoprotein; haemagglutination; lectin; sialylation adhesion; glycoprotein; haemagglutination; lectin; sialylation
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Ludwig, A.-K.; Michalak, M.; Shilova, N.; André, S.; Kaltner, H.; Bovin, N.V.; Kopitz, J.; Gabius, H.-J. Studying the Structural Significance of Galectin Design by Playing a Modular Puzzle: Homodimer Generation from Human Tandem-Repeat-Type (Heterodimeric) Galectin-8 by Domain Shuffling. Molecules 2017, 22, 1572.

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