Published in
International Union of Crystallography, Acta Crystallographica Section F: Structural Biology and Crystallization Communications, 1(62), p. 70-73, 2005
DOI: 10.1107/s1744309105041473
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The production, purification and crystallization of a soluble form of the nonclassical MHC HLA-G: the essential role of cobalt
,
James McCluskey,
Jamie Rossjohn
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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.