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• W2006218855 abstract "Heparan sulfate (HS) recognizes a variety of proteins, one of which is the pleiotropic cytokine IFN-γ, and as such modulates many biological processes. IFN-γ is a homodimer with a well-defined core and two flexible C-termini that constitute HS binding domains. We show here using molecular modeling that an extended IFN-γ structure overlaps a HS fragment of 16 disaccharides (16 nm). Since a 21−24-disaccharide HS fragment was experimentally defined as the minimum size that interacts with IFN-γ [Lortat-Jacob, H., Turnbull, J. E., and Grimaud, J. A. (1995) Biochem. J. 310 (Part 2), 497−505], this raises the question of the complexe organization. We combine analytical ultracentrifugation, size exclusion chromatography, and hydrodynamic bead modeling to characterize the complexes formed in solution with heparin oligosaccharides. For oligosaccharides of 14 and 20 nm, two types of complexes are formed with one IFN-γ and one or two heparin molecules. Complexes consisting of two IFN-γ and one or two heparin molecules are present for a fragment of 25 nm and aggregates for a fragment of 35 nm. The complexes are rather compact and can be formed without major conformational changes of the partners. The complex pattern of interaction is related to the size of the partners and their multiple binding possibilities. These various possibilities suggest networks of interactions at the crowded surface of the cells. Hydrodynamic methods used here proved to be very efficient tools for describing protein−HS complexes that, due to the intrinsic heterogeneity and flexibility of the partners, are otherwise very difficult to analyze." @default.
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• W2006218855 date "2006-10-17" @default.
• W2006218855 modified "2023-10-14" @default.
• W2006218855 title "Organization of Human Interferon γ−Heparin Complexes from Solution Properties and Hydrodynamics" @default.
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• W2006218855 doi "https://doi.org/10.1021/bi061490w" @default.
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