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- W1569276586 abstract "A portion of rat mannose-binding protein A (MBP-A), a Ca(2+)-dependent animal lectin, has been overproduced in a bacterial expression system, biochemically characterized, and crystallized. A fragment corresponding to the COOH-terminal 115 residues of native MBP-A, produced by subtilisin digestion of the bacterially expressed protein, contains the carbohydrate-recognition domain (CRD). Gel filtration, chemical cross-linking, and crystallographic self-rotation function analyses indicate that the subtilisin fragment is a dimer, although the complete bacterially expressed fragment, containing the neck and CRD of MBP-A, is a trimer. Crystals of the minimal CRD, obtained only as a complex with a Man6GlcNAc2Asn glycopeptide, diffract to Bragg spacings of at least 1.7 A. Several trivalent lanthanide ions (Ln3+) can substitute for Ca2+, as assessed by their ability to support carbohydrate binding and to protect the CRD from proteolysis in a manner similar to that observed for Ca2+. These assays indicate that Ln2+ binds about 30 times more tightly than Ca2+ to the CRD, and that two Ca2+ or Ln3+ bind to each monomer, a result confirmed by determination of the Ho3+ positions in a Ho(3+)-containing crystal of the CRD. Crystals grown in the presence of Ln3+ belong to different space groups from those obtained with Ca2+ and are therefore not useable for traditional crystallographic phase determination methods, but are well-suited for high resolution structure determination by multiwavelength anomalous dispersion phasing." @default.
- W1569276586 created "2016-06-24" @default.
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- W1569276586 date "1991-11-01" @default.
- W1569276586 modified "2023-10-16" @default.
- W1569276586 title "Physical characterization and crystallization of the carbohydrate-recognition domain of a mannose-binding protein from rat." @default.
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- W1569276586 doi "https://doi.org/10.1016/s0021-9258(18)54762-1" @default.
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