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• W1679623396 abstract "The leukocyte integrin complement receptor type III (CR3, CD11b/CD18) binds the C3 cleavage product iC3b. Many other integrins bind their ligands via an Arg-Gly-Asp (RGD) triplet. Both the RGD-containing C3 peptide 1390TRYRGDQDATMS1401 (pro-C3 numbering) and the RGD-like fibrinogen peptide GGAKQAGDV, which binds to the platelet integrin glycoprotein IIb-IIIa, were shown to inhibit the iC3b-CR3 interaction, suggesting that this binding is also RGD-mediated (Wright, S.D., Weitz, J.I., Huang, A. J., Levin, S.M., Silverstein, S.C., and Loike, J.D. (1988) Proc. Natl. Acad. Sci. U.S.A. 85, 7734-7738). However, unlike other integrin-ligand interactions, that of CR3 and iC3b is unaffected by the hexapeptide GRGDSP, and substitutions in the RGD triplet of C3 from other species appear to be tolerated. It was, therefore, proposed (Grossberger, D., Marcuz, A., du Pasquier, L., and Lambris, J.D. (1989) Proc. Natl. Acad. Sci. U.S.A. 86, 1323-1327) that the highly conserved DATMS portion of the inhibitory C3 peptide may have been responsible for its binding. To address these inconsistencies and directly assess the role of the 1390-1401 segment within the complete iC3b molecule in mediating binding to CR3, a human C3 cDNA was altered by site-directed mutagenesis and the expressed recombinant proteins were examined in a CR3-specific assay. Replacement of RGD by AAA did not abolish rosetting of the corresponding iC3b-coated erythrocytes to human CR3-bearing leukocytes. In addition, mutant iC3b molecules in which the positively charged R1391 (corresponding to K in the fibrinogen peptide) and the highly conserved 1397DATMS sequence were replaced by Q and NAAMA respectively, were still bound by CR3. We conclude that the iC3b-CR3 interaction is not mediated by the RGD triplet or its neighboring residues." @default.
• W1679623396 created "2016-06-24" @default.
• W1679623396 creator A5000201491 @default.
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• W1679623396 date "1992-01-01" @default.
• W1679623396 modified "2023-10-18" @default.
• W1679623396 title "Mutagenesis of the Arg-Gly-Asp triplet in human complement component C3 does not abolish binding of iC3b to the leukocyte integrin complement receptor type III (CR3, CD11b/CD18)." @default.
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• W1679623396 doi "https://doi.org/10.1016/s0021-9258(18)48541-9" @default.
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