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- W2040238364 abstract "Human beta 2-microglobulin (beta 2-m) was isolated from urine samples of patients with tubular dysfunctions and aggregated with glutaraldehyde. Four aggregates with molecular weights of 800,000, 480,000, 260,000, and 60,000 were separated by filtration on Sephacryl S-300. The aggregates and monomeric beta 2-m (11,800 MW) were subsequently labeled with 125I and tested for binding to streptococci. Group A streptococci bound only aggregated beta 2-m with a mean binding of 44.5%. Most of the group G streptococci, on the other hand, bound only monomeric beta 2-m with a mean binding of 58%. Among group B streptococci the serotypes with protein antigens interacted mainly with monomeric beta 2-m and those without protein antigens preferentially with aggregated beta 2-m. Nontypable group B streptococcal serotypes did not bind monomeric or aggregated beta 2-m. Of the streptococci belonging to group C, S. equisimilis reacted with monomeric beta 2-m and S. dysgalactiae with aggregated beta 2-m. S. equi did not interact with monomeric beta 2-m or aggregated beta 2-m. Bindings of monomeric beta 2-m and aggregated beta 2-m were saturable and could be inhibited by the respective unlabeled forms of beta 2-m. Fibrinogen, fibronectin, alpha 2-macroglobulin, haptoglobin, or immunoglobulin G did not inhibit the binding of either form of beta 2-m. The binding sites for monomeric beta 2-m were more susceptible to trypsin than those for aggregated beta 2-m. Treatment of streptococci with pronase destroyed their binding activities for monomeric and aggregated beta 2-m. Both monomeric beta 2-m and aggregated beta 2-m binding sites were sensitive to heat. The Scatchard plots of monomeric beta 2-m and aggregated beta 2-m were linear with Kd of 1.29 X 10(-9) M and 1.9 X 10(-9) M respectively. The number of binding sites per bacterium were estimated to be 81,000 for monomeric beta 2-m and 1,210 for aggregated beta 2-m." @default.
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- W2040238364 date "1986-02-01" @default.
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- W2040238364 title "Specific Binding Sites for Monomeric and Aggregated β2-Microglobulin on Surface of Groups A, B, C, and G Streptococci" @default.
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- W2040238364 doi "https://doi.org/10.1111/j.1348-0421.1986.tb00930.x" @default.
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