91682-30-3Relevant academic research and scientific papers
Partially modified retro-inverso pseudopeptides as non-natural ligands for the human class I histocompatibility molecule HLA-A2
Guichard, Gilles,Connan, Francine,Graff, Roland,Ostankovitch, Marina,Muller, Sylviane,Guillet, Jean-Gérard,Chopping, Jeannine,Briand, Jean-Paul
, p. 2030 - 2039 (2007/10/03)
Syntheses of a series of partially modified retro-inverso analogues of the antigenic peptide M58-66 derived from the influenza virus matrix protein are reported. The retro-inverso modification Ψ(NH-CO) was obtained by replacement of two successive amino acid residues with a 2-substituted malonate derivative and gem-diaminoalkyl residue. The resulting compounds 1- 8 were tested for their binding to the human histocompatibility class I molecule HLA-A2 in an assembly assay using lysates of peptide transporter- deficient cells T2. Specific peptide-dependent HLA-A2 assembly was revealed by an enzyme-linked immunosorbent assay. Significant HLA-A2 assembly was detected in the presence of analogues [gGly58-(S)mLeu59]-M58-66 (1a), [gGly61-(R,S)mPhe62]M58-66 (4), [gVal63-(R,S)mPhe64]M58-66 (6), and [gPhe64(R,S)mAla65]M58-66 (7). The introduction of the retro-inverso modification between P2-P3, P3-P4, P5-P6, and P8-P9 (compounds 2, 3, 5, and 8, respectively) however led to a dramatic reduction in peptide binding to HLA-A2. Interestingly, compound 1a which contains modification between P1-P2 was found to be the most potent analogue, being able to retain the original HLA-A2 binding profile of the parent peptide M58-66. Taken together, these results and recent binding data obtained in the context of murine MHC class I molecule H-2K(d) suggest that the incorporation of peptide bond surrogates in MHC class I-restricted epitopes is a useful approach to design molecules having both increased stability and high MHC-binding capacity. Depending on their agonist or antagonist effects at the T-cell receptor, such non-natural MHC ligands are likely to find many applications in the development of peptide-based vaccines or as potential therapeutic agents in the treatment of allergies and autoimmune diseases.
6-Acyl derivatives of aminopenicillanic acid
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, (2008/06/13)
Compounds represented by the following formula STR1 wherein R is hydrogen, lower alkanoyloxymethyl, lower alkyl, indanyl or a radical represented by the formula STR2 wherein X may be hydrogen, halogen, hydroxy, lower alkyl, lower alkoxy or a lower alkoxy-lower alkyl group, Pharmaceutically acceptable salts and hydrates thereof. These compounds are useful as antibiotics.
