Solution structures of the fibronectin-like Leishmania gp63 SRYD-containing sequence in the free and antibody-bound states--transferred NOE and molecular dynamics studies - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue European Journal of Biochemistry Année : 1998

Solution structures of the fibronectin-like Leishmania gp63 SRYD-containing sequence in the free and antibody-bound states--transferred NOE and molecular dynamics studies

Résumé

The anti-SRYD monoclonal antibody (mAbSRYD) raised against the IASRYDQL synthetic octapeptide, the 250-257 sequence of the Leishmania major surface glycoprotein gp63 recognizes both SRYD-containing peptides and the whole cognate major surface protein on intact parasites. Two SRYD-containing peptides, which antigenically and functionally mimic the RGDS sequence of fibronectin and efficiently inhibit parasite attachment to the macrophage receptors, were studied by two-dimensional transferred nuclear Overhauser effect experiments in the presence of mAbSRYD. The antibody-bound IASRYDQL octapeptide solution conformation was determined on the basis of 55 interproton-distance restraints, derived from NMR measurements. Eighteen structures which were first generated using an approach combining distance geometry and molecular dynamics, converge by energy minimization toward a folded structure with an average rmsd from the experimental data of less than 0.05 nm for the overall backbone and 0.025 nm for the SRYD motif. A distorted gamma-turn was found, stabilized by the backbone-backbone D255-NH to R253-CO hydrogen bond, while the R253 and D255 side chains are pointing in opposite directions. This latter antibody-bound structure is compared with that of the free octapeptide in dimethylsulfoxide solution, and with the crystal structure of the RYD fragment in OPG2 Fab, an antireceptor antibody that mimics the RGD cell adhesion site. On this basis, a mechanism for IASRYDQL-receptor interaction is discussed.

Dates et versions

hal-00433173 , version 1 (18-11-2009)

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Marie-Christine Petit, Piotr Orlewski, Vassilios Tsikaris, Maria Sakarellos-Daitsiotis, Constantinos Sakarellos, et al.. Solution structures of the fibronectin-like Leishmania gp63 SRYD-containing sequence in the free and antibody-bound states--transferred NOE and molecular dynamics studies. European Journal of Biochemistry, 1998, 253 (1), pp.184-93. ⟨10.1046/j.1432-1327.1998.2530184.x⟩. ⟨hal-00433173⟩
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