Invariant chain made in Escherichia coli has an exposed N-terminal segment that blocks antigen binding to HLA-DR1 and a trimeric C-terminal segment that binds empty HLA-DR1.

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Invariant chain made in Escherichia coli has an exposed N-terminal segment that blocks antigen binding to HLA-DR1 and a trimeric C-terminal segment that binds empty HLA-DR1.

Invariant chain (Ii), a membrane glycoprotein, binds class II major histocompatibility complex (MHC) glycoproteins, probably via its class II-associated Ii peptide (CLIP) segment, and escorts them toward antigen-containing endosomal compartments. We find that a soluble, trimeric ectodomain of Ii expressed and purified from Escherichia coli blocks peptide binding to soluble HLA-DR1. Proteolysis ...

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Identification of HLA-DR1 beta chain residues critical for binding staphylococcal enterotoxins A and E

Superantigens are thought to make external contacts with major histocompatibility complex (MHC) class II molecules and with the V beta portion of a T cell antigen receptor (TCR), thereby stimulating entire families of T cells. The precise mapping of superantigen binding sites on class II molecules may provide valuable information on how TCR and MHC molecules interact. Two bacterial superantigen...

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Selective release of some invariant chain-derived peptides from HLA-DR1 molecules at endosomal pH

The predominant peptides bound to major histocompatibility complex class II molecules expressed on human B cells are derived from a relatively limited number of self proteins. To determine whether any of the prebound self peptides might be released in endosomes during recycling, water-soluble HLA-DR1 molecules were incubated with a high affinity synthetic peptide at pH 4.0 and 7.0 at 37 degrees...

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Immunogenicity of HLA-DR1 Restricted Peptides Derived from Leishmania major gp63 Using FVB/N-DR1 Transgenic Mouse Model

BACKGROUND Leishmaniasis is a worldwide disease prevalent in tropical and sub-tropical countries. In the present study the immunogenicity of three human HLA-DR1 restricted peptides derived from L. major gp63 protein was evaluated using FVB/N-DR1 transgenic mouse model. METHODS The immunity generated by three MHC class II - restricted peptides with the sequence of AARLVRLAAAGAAVT (AAR), AAPLVR...

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Identification of the Lateral Interaction Surfaces of Human Histocompatibility Leukocyte Antigen (HLA)-DM with HLA-DR1 by Formation of Tethered Complexes That Present Enhanced HLA-DM Catalysis

Human histocompatibility leukocyte antigen (HLA)-DM is a major histocompatibility complex (MHC)-like protein that catalyzes exchange of antigenic peptides from MHC class II molecules. To investigate the molecular details of this catalysis we created four covalent complexes between HLA-DM and the MHC class II allele DR1. We introduced a disulfide bond between the naturally occurring cysteine bet...

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ژورنال

عنوان ژورنال: Proceedings of the National Academy of Sciences

سال: 1995

ISSN: 0027-8424,1091-6490

DOI: 10.1073/pnas.92.24.11289