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Isolation of a melibiose-binding protein from human spleen

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Abstract

A melibiose-binding protein was isolated from human spleen by serial affinity chromatography on lactose-, mannose-, and melibiose-Sepharose. The purified protein agglutinated rabbit erythrocytes and re-bound to melibiose, but did not bind to murine nor human laminin. The protein was composed of ∼58 kDA, 32 kDa and 26 kDa polypeptides. The polypeptides were detected in buffy coat cell extracts and they were synthesizedin vitro by B lymphoblastoid cells. The polypeptides did not react with anti-galaptin, anti-C-reactive protein, anti-amyloid P, anti-keratin, and anti-rat lung lectin 29 sera. The 58 kDa polypeptide reacted very weakly with anti-core-specific lectin serum and reacted with anti-IgG serum. The data suggest that the major protein isolated is an anti-Galαl → 6 immunoglobulin.

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Abbreviations

ME:

mercaptoethanol

PMSF:

phenylmethylsufonyl fluoride

HEPES:

4-(2-hydroxyethyl)-1-piperazine ethanosulfonate

PBS:

0.01m PO4, 0.12m NaCl, pH 7.3

TBS:

0.1m NaCl, 0.05m Tris, 0.05% NaN3, 0.01m CaCl2, 0.001m MgCl2, pH 7.3

BSA:

bovine serum albumin

GSI:

Griffonia simplicifolia I

SDS-PAGE:

sodium dodecylsulfate-polyacrylamide gel electrophoresis

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Sharma, A., Ahmed, H. & Allen, H.J. Isolation of a melibiose-binding protein from human spleen. Glycoconjugate J 12, 17–21 (1995). https://doi.org/10.1007/BF00731864

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  • DOI: https://doi.org/10.1007/BF00731864

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