James B.
Derr
a,
Jesse
Tamayo
b,
John A.
Clark
c,
Maryann
Morales
b,
Maximillian F.
Mayther
b,
Eli M.
Espinoza
b,
Katarzyna
Rybicka-Jasińska
c and
Valentine I.
Vullev
*abcd
aDepartment of Biochemistry, University of California, Riverside, CA 92521, USA. E-mail: vullev@ucr.edu
bDepartment of Chemistry, University of California, Riverside, CA 92521, USA
cDepartment of Bioengineering, University of California, Riverside, CA 92521, USA
dMaterials Science and Engineering Program, University of California, Riverside, CA 92521, USA
First published on 1st April 2021
Correction for ‘Multifaceted aspects of charge transfer’ by James B. Derr et al., Phys. Chem. Chem. Phys., 2020, 22, 21583–21629, DOI: 10.1039/d0cp01556c.
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Fig. 6 (c) Charge distribution in the bridging states, b1 and b2, where the transferred electron is on the LUMOs, or the transferred hole is on the HOMOs, of the bridging units. |
The polyprolines do not have hydrogen-bonding networks because they contain only tertiary amides along their backbones. Isomerization of the peptide bonds in polyprolines between E and Z alters the type of helical conformation and changes the magnitude and the direction of the macrodipole. Specifically, comprising peptide bonds in their Z-conformations, polyproline type I (PPI) has a dipole of 4.1 D per residue that points from its N- to its C-terminus, which is opposite to α- and 310-helices containing all Z-amides.231,235 Conversely, polyproline type II (PPII) contains E-amides and has a dipole of 1.5 D per residue, pointing from its C- to its N-terminus.231,235 Because of this difference in the magnitude of the macrodipole, changes in solvent polarity induce transitions between PPI and PPII conformations,236 which can serve as an electret switch.
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