Local order in the unfolded state: conformational biases and nearest neighbor interactions

S Toal, R Schweitzer-Stenner - Biomolecules, 2014 - mdpi.com
The discovery of Intrinsically Disordered Proteins, which contain significant levels of disorder
yet perform complex biologically functions, as well as unwanted aggregation, has motivated …

pH-Independence of trialanine and the effects of termini blocking in short peptides: a combined vibrational, NMR, UVCD, and molecular dynamics study

S Toal, D Meral, D Verbaro, B Urbanc… - The Journal of …, 2013 - ACS Publications
Several lines of evidence now well establish that unfolded peptides in general, and alanine
in specific, have an intrinsic preference for the polyproline II (pPII) conformation …

Do molecular dynamics force fields accurately model Ramachandran distributions of amino acid residues in water?

B Andrews, J Guerra, R Schweitzer-Stenner… - Physical Chemistry …, 2022 - pubs.rsc.org
Molecular dynamics (MD) is a powerful tool for studying intrinsically disordered proteins,
however, its reliability depends on the accuracy of the force field. We assess Amber ff19SB …

Glycine in water favors the polyproline II state

B Andrews, S Zhang, R Schweitzer-Stenner, B Urbanc - Biomolecules, 2020 - mdpi.com
Conformational preferences of amino acid residues in water are determined by the
backbone and side-chain properties. Alanine is known for its high polyproline II (pPII) …

Exhaustive mapping of the conformational space of natural dipeptides by the DFT-D3//COSMO-RS method

T Kalvoda, M Culka, L Rulíšek… - The Journal of Physical …, 2022 - ACS Publications
We extensively mapped energy landscapes and conformations of 22 (including three His
protonation states) proteinogenic α-amino acids in trans configuration and the …

Short peptides as predictors for the structure of polyarginine sequences in disordered proteins

B Milorey, R Schweitzer-Stenner, B Andrews… - Biophysical journal, 2021 - cell.com
Intrinsically disordered proteins and intrinsically disordered regions are frequently enriched
in charged amino acids. Intrinsically disordered regions are regularly involved in important …

Demixing of water and ethanol causes conformational redistribution and gelation of the cationic GAG tripeptide

B Milorey, S Farrell, SE Toal… - Chemical …, 2015 - pubs.rsc.org
The cationic tripeptide GAG undergoes three conformational changes in binary mixtures of
water and ethanol. At 17 mol% of ethanol conformational sampling is shifted from pPII …

Disorder and order in unfolded and disordered peptides and proteins: a view derived from tripeptide conformational analysis. I. Tripeptides with long and …

R Schweitzer‐Stenner, A Hagarman… - Proteins: Structure …, 2013 - Wiley Online Library
We performed a conformational analysis of the central residues of three tripeptides glycyl‐l‐
isoleucyl‐glycine (GIG), glycyl‐l‐tyrosyl‐glycine (GYG) and glycyl‐l‐arginyl‐glycine (GRG) in …

Anticooperative nearest-neighbor interactions between residues in unfolded peptides and proteins

R Schweitzer-Stenner, SE Toal - Biophysical journal, 2018 - cell.com
Growing evidence suggests that the conformational distributions of amino acid residues in
unfolded peptides and proteins depend on the nature of the nearest neighbors. To explore …

Probing the conformation-dependent preferential binding of ethanol to cationic glycylalanylglycine in water/ethanol by vibrational and NMR spectroscopy

D DiGuiseppi, B Milorey, G Lewis… - The Journal of …, 2017 - ACS Publications
The conformational propensity of amino acid residues is determined by an intricate balance
of peptide–solvent and solvent–solvent interactions. To explore how the systematic …