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The two subunits of the human class I histocompatibility antigen (HLA)-A2 have been expressed at high levels (20-30 mg/liter) as insoluble aggregates in bacterial cells. The aggregates were dissolved in 8 M urea and then refolded to form an HLA-A2-peptide complex by removal of urea in the presence of an antigenic peptide. Two peptides from the matrix protein and nucleoprotein of influenza virus are known to bind to HLA-A2, and both support the refolding of the recombinant HLA-A2 molecule. An additional peptide, a nonamer from the gp120 envelope protein of human immunodeficiency virus type 1, also supported refolding. Yields of purified recombinant HLA-A2 are 10-15%. In the absence of an HLA-A2-restricted peptide, a stable HLA-A2 complex was not formed. Monoclonal antibodies known to bind to native HLA-A2 also bound to the recombinant HLA-A2-peptide complex. Three purified HLA-A2-peptide complexes refolded from bacterially produced protein aggregates crystallize under the identical conditions as HLA-A2 purified from human lymphoblastoid cells. Crystals of the recombinant HLA-A2 molecule in complex with the influenza matrix nonamer peptide, Mp(58-66), diffract to greater than 1.5-A resolution.

HLA-A2-peptide complexes: refolding and crystallization of molecules expressed in Escherichia coli and complexed with single antigenic peptides.