Topographic analysis of the S7 binding subsite of the tachykinin neurokinin-1 receptor

Conformationally and configurationally restricted rotameric probes of phenylalanine have been incorporated in the sequence of substance P (SP)—Arg‐Pro‐Lys‐Pro‐Gln‐Gln‐Phe‐Phe‐Gly‐Leu‐Met‐NH2—for analyzing the binding pockets of Phe7 (S7) and Phe8 (S8), in the neurokinin‐1 receptor. These analogues o...

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Veröffentlicht in:Biopolymers 1996-08, Vol.39 (2), p.133-147
Hauptverfasser: Josien, Hubert, Convert, Odile, Berlose, Jean-Philippe, Sagan, Sandrine, Brunissen, Alié, Lavielle, Solange, Chassaing, Gérard
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container_end_page 147
container_issue 2
container_start_page 133
container_title Biopolymers
container_volume 39
creator Josien, Hubert
Convert, Odile
Berlose, Jean-Philippe
Sagan, Sandrine
Brunissen, Alié
Lavielle, Solange
Chassaing, Gérard
description Conformationally and configurationally restricted rotameric probes of phenylalanine have been incorporated in the sequence of substance P (SP)—Arg‐Pro‐Lys‐Pro‐Gln‐Gln‐Phe‐Phe‐Gly‐Leu‐Met‐NH2—for analyzing the binding pockets of Phe7 (S7) and Phe8 (S8), in the neurokinin‐1 receptor. These analogues of phenylalanine are (2S, 3R)‐ and (2S, 3S)‐indanylglycines, E‐ and Z‐α, β‐dehydrophenylalanines, and 2(S)‐α, β‐cyclopropylphenylalanines [ΔE Phe, ΔZPhe, ▿E2(S)Phe, and ▿Z2(S)Phe]. Binding data obtained with either conformationally (Ing diastereoisomers) or configurationally (ΔEPhe, ΔZPhe) probes have unveiled large differences in the binding potencies of these rotameric probes. With the support of nmr data and energy calculations done on these SP‐substituted analogues, we attempt to answer questions inherent to such study. First, none of these six probes prevents the formation of bioactive conformation(s) of the backbone of SP. Second, both diastereoisomers (S, S) and (S, R) of indanylglycine preferentially adopt, in the sequence of SP, the gauche (−) and trans side‐chain orientations, respectively, as previously postulated from energy calculations with model peptides. However, in solution, the difference in energy between these rotamers included in the sequence of SP, compared to model peptides, is smaller since the other rotamer can be detected in [(2S, 3R) Ing7]SP. Finally, from this study we can hypothesize that the large variations observed in the affinities of Phe7 substituted analogues of SP must come from steric hindrance in the S7 binding site, which drastically restricts the space filling around the Cα (SINGLE BOND) Cβ bond of residue 7. © 1996 John Wiley & Sons, Inc.
doi_str_mv 10.1002/(SICI)1097-0282(199608)39:2<133::AID-BIP2>3.0.CO;2-Q
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These analogues of phenylalanine are (2S, 3R)‐ and (2S, 3S)‐indanylglycines, E‐ and Z‐α, β‐dehydrophenylalanines, and 2(S)‐α, β‐cyclopropylphenylalanines [ΔE Phe, ΔZPhe, ▿E2(S)Phe, and ▿Z2(S)Phe]. Binding data obtained with either conformationally (Ing diastereoisomers) or configurationally (ΔEPhe, ΔZPhe) probes have unveiled large differences in the binding potencies of these rotameric probes. With the support of nmr data and energy calculations done on these SP‐substituted analogues, we attempt to answer questions inherent to such study. First, none of these six probes prevents the formation of bioactive conformation(s) of the backbone of SP. Second, both diastereoisomers (S, S) and (S, R) of indanylglycine preferentially adopt, in the sequence of SP, the gauche (−) and trans side‐chain orientations, respectively, as previously postulated from energy calculations with model peptides. However, in solution, the difference in energy between these rotamers included in the sequence of SP, compared to model peptides, is smaller since the other rotamer can be detected in [(2S, 3R) Ing7]SP. 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These analogues of phenylalanine are (2S, 3R)‐ and (2S, 3S)‐indanylglycines, E‐ and Z‐α, β‐dehydrophenylalanines, and 2(S)‐α, β‐cyclopropylphenylalanines [ΔE Phe, ΔZPhe, ▿E2(S)Phe, and ▿Z2(S)Phe]. Binding data obtained with either conformationally (Ing diastereoisomers) or configurationally (ΔEPhe, ΔZPhe) probes have unveiled large differences in the binding potencies of these rotameric probes. With the support of nmr data and energy calculations done on these SP‐substituted analogues, we attempt to answer questions inherent to such study. First, none of these six probes prevents the formation of bioactive conformation(s) of the backbone of SP. Second, both diastereoisomers (S, S) and (S, R) of indanylglycine preferentially adopt, in the sequence of SP, the gauche (−) and trans side‐chain orientations, respectively, as previously postulated from energy calculations with model peptides. 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subjects Amino Acid Sequence
Binding Sites
Molecular Sequence Data
Protein Conformation
Receptors, Neurokinin-1 - ultrastructure
title Topographic analysis of the S7 binding subsite of the tachykinin neurokinin-1 receptor
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