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@ARTICLE{Schulte:845267,
author = {Schulte, Marianne and Panwalkar, Vineet and Freischem,
Stefan and Willbold, Dieter and Dingley, Andrew J.},
title = {{P}roline {R}estricts {L}oop {I} {C}onformation of the
{H}igh {A}ffinity {WW} {D}omain from {H}uman {N}edd4-1 to a
{L}igand {B}inding-{C}ompetent {T}ype {I} β-{T}urn},
journal = {The journal of physical chemistry / B},
volume = {122},
number = {15},
issn = {1520-5207},
address = {Washington, DC},
publisher = {Soc.},
reportid = {FZJ-2018-02548},
pages = {4219 - 4230},
year = {2018},
abstract = {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.},
cin = {ICS-6},
ddc = {530},
cid = {I:(DE-Juel1)ICS-6-20110106},
pnm = {553 - Physical Basis of Diseases (POF3-553)},
pid = {G:(DE-HGF)POF3-553},
typ = {PUB:(DE-HGF)16},
pubmed = {pmid:29595969},
UT = {WOS:000430784000004},
doi = {10.1021/acs.jpcb.7b11637},
url = {https://juser.fz-juelich.de/record/845267},
}