Volume 10, Issue 5, Pages (May 2003)

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Volume 10, Issue 5, Pages 411-417 (May 2003) Rational Design and Molecular Diversity for the Construction of Anti-α-Bungarotoxin Antidotes with High Affinity and In Vivo Efficiency Luisa Lozzi, Barbara Lelli, Ylenia Runci, Silvia Scali, Andrea Bernini, Chiara Falciani, Alessandro Pini, Neri Niccolai, Paolo Neri, Luisa Bracci Chemistry & Biology Volume 10, Issue 5, Pages 411-417 (May 2003) DOI: 10.1016/S1074-5521(03)00094-2

Figure 1 Comparison of p6.7 with Structural Models of the Nicotinic Receptor Binding Site (A) Structural superposition of p6.7 from α-bgt/p6.7 complex (PDB ID 1JBD) on α1 (182-202)-α-bgt complex (PDB ID 1L4W). Structures of the toxin and α1 peptide in bound form are colored blue and cyan, respectively; p6.7 is colored yellow. (B) Structural superposition of p6.7-α-bgt complex (PDB ID 1JBD) on putative ligand binding loop of AChBP (PDB ID 1I9B): close view of the backbone fitting result for residues 3–10 of p6.7 on residues 184–191 of AchBP. Toxin R36 is stacking onto AChBP W143. Structures of toxin and peptide are colored green and yellow, respectively; AChBP is colored blue. (C) Toxin-AChBP complex as viewed down the oligomer 5-fold axis. Chemistry & Biology 2003 10, 411-417DOI: (10.1016/S1074-5521(03)00094-2)

Figure 2 Definition of p6.7 Minimal α-bgt Binding Sequence α-bgt binding of peptide from p6.7 sequence, progressively shortened at N- (A) and C (B) termini, was analyzed by BIACORE on α-bgt-biotin SA sensor chip. Peptide concentration was 10 μg/ml, flow rate 10 μl/min. Chemistry & Biology 2003 10, 411-417DOI: (10.1016/S1074-5521(03)00094-2)

Figure 3 Affinity Maturation of p6.7 Peptides koff ratio with respect to p6.7 is shown. Peptides diluted to 10 μg/ml were injected at 10 μl/min over α-bgt-biotin SA sensor chip; flow rate was 10 μl/min. Peptide koff were calculated with BIAevaluation 3.0 software. Chemistry & Biology 2003 10, 411-417DOI: (10.1016/S1074-5521(03)00094-2)

Figure 4 Comparison of α-bgt Binding of p6.7 and Selected 13-merDD and 14-merDDD Peptides Peptides at concentrations ranging from 0.1 to 10 μg/ml were injected over α-bgt-biotin SA sensor chip. Flow rate was 10 μl/min. Kinetic rates and affinity constants were calculated by BIAevaluation 3.0 software. The overlay of sensorgrams obtained with 2 μg/ml is reported in the figure. Chemistry & Biology 2003 10, 411-417DOI: (10.1016/S1074-5521(03)00094-2)

Figure 5 Inhibition of 125I-α-bgt Binding to Torpedo nAchR by p6.7, 13-merDD, and 14-merDDD Peptides at different concentrations, ranging from 5 μM to 50 fM, were incubated with 105 cpm of 125I-α-bgt (Amersham Italia Srl) for 1 hr at room temperature on plates coated with affinity-purified nAchR. Assays were performed in triplicate and the half-maximal inhibition constant IC50 was calculated by nonlinear regression analysis using GraphPad Prism 3.02 software. Chemistry & Biology 2003 10, 411-417DOI: (10.1016/S1074-5521(03)00094-2)