Home > Publications database > Proline Restricts Loop I Conformation of the High Affinity WW Domain from Human Nedd4-1 to a Ligand Binding-Competent Type I β-Turn > print

001     845267
005     20210129233338.0
024 7 _ |a 10.1021/acs.jpcb.7b11637
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082 _ _ |a 530
100 1 _ |a Schulte, Marianne
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245 _ _ |a Proline Restricts Loop I Conformation of the High Affinity WW Domain from Human Nedd4-1 to a Ligand Binding-Competent Type I β-Turn
260 _ _ |a Washington, DC
|c 2018
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520 _ _ |a Sequence alignment of the four WW domains from human Nedd4-1 (neuronal precursor cell expressed developmentally down-regulated gene 4-1) reveals that the highest sequence diversity exists in loop I. Three residues in this type I β-turn interact with the PPxY motif of the human epithelial Na+ channel (hENaC) subunits, indicating that peptide affinity is defined by the loop I sequence. The third WW domain (WW3*) has the highest ligand affinity and unlike the other three hNedd4-1 WW domains or other WW domains studied contains the highly statistically preferred proline at the (i + 1) position found in β-turns. In this report, molecular dynamics simulations and experimental data were combined to characterize loop I stability and dynamics. Exchange of the proline to the equivalent residue in WW4 (Thr) results in the presence of a predominantly open seven residue Ω loop rather than the type I β-turn conformation for the wild-type apo-WW3*. In the presence of the ligand, the structure of the mutated loop I is locked into a type I β-turn. Thus, proline in loop I ensures a stable peptide binding-competent β-turn conformation, indicating that amino acid sequence modulates local flexibility to tune binding preferences and stability of dynamic interaction motifs.
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700 1 _ |a Panwalkar, Vineet
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700 1 _ |a Freischem, Stefan
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700 1 _ |a Willbold, Dieter
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700 1 _ |a Dingley, Andrew J.
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773 _ _ |a 10.1021/acs.jpcb.7b11637
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