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- W2061629105 abstract "A high-affinity Zn(II)-binding protein has been purified to homogeneity (880-fold) from the plasma of lactating women by a single affinity adsorption step on columns of tris(carboxymethyl)ethylenediamine (TED)-agarose loaded with Zn(II) ions. Purity was evaluated by high-performance reverse-phase (phenyl) chromatography and by silver staining after SDS-polyacrylamide gradient gel electrophoresis. The mass of denatured Zn(II)-binding protein was estimated by SDS-polyacrylamide gradient gel electrophoresis to be 75 kDa under both reducing and nonreducing conditions; by matrix-assisted uv laser desorption time-of-flight mass spectrometry the purified protein mass was determined to be 66 kDa. The amino acid composition revealed a high content of His (13 mol%) and Pro (12 mol%). N-terminal amino acid sequence analysis (50 residues) identified the purified protein as histidine-rich glycoprotein (HRG). Immunoblots demonstrated the absence of fragments in the purified product. An enzyme-linked immunosorbent assay was developed; a 75% recovery of intact HRG from the immobilized Zn(II) ion affinity column was documented. The circular dichroism spectra for the purified human HRG in the far uv (260-178 nm) were similar to those published for human and rabbit serum HRG. These results demonstrate that TED-immobilized Zn(II) ions can be used as a new and efficient method for the isolation of structurally intact human plasma HRG." @default.
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- W2061629105 date "1991-10-01" @default.
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- W2061629105 title "Metal ion affinity adsorption of a Zn(II)-transport protein present in maternal plasma during lactation: Structural characterization and identification as histidine-rich glycoprotein" @default.
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- W2061629105 doi "https://doi.org/10.1016/1046-5928(91)90094-y" @default.
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