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  • Title: The production, purification and crystallization of a soluble form of the nonclassical MHC HLA-G: the essential role of cobalt.
    Author: Clements CS, Kjer-Nielsen L, Kostenko L, McCluskey J, Rossjohn J.
    Journal: Acta Crystallogr Sect F Struct Biol Cryst Commun; 2006 Jan 01; 62(Pt 1):70-3. PubMed ID: 16511266.
    Abstract:
    HLA-G is a nonclassical class I major histocompatibility complex (MHC) molecule that is primarily expressed at the foetal-maternal interface. Although the role of HLA-G has not been fully elucidated, current evidence suggests it protects the foetus from the maternal immune response. In this report, HLA-G (44 kDa) is characterized by expression in Escherichia coli. The inclusion bodies were refolded in complex with a peptide derived from histone H2A (RIIPRHLQL), purified and subsequently crystallized. Correct refolding was determined using two conformation-dependent antibodies. Cobalt ions were shown to be an essential ingredient for obtaining diffraction-quality crystals. The crystals, which diffracted to 1.9 A resolution, belonged to space group P3(2)2(1), with unit-cell parameters a = b = 77.15, c = 151.72 A.
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