scholarly journals Circular dichroism studies of ?-aminoisobutyric acid-containing peptides: Chain length and solvent effects in alternating Aib-L-Ala and Aib-L-Val sequences

Biopolymers ◽  
1984 ◽  
Vol 23 (5) ◽  
pp. 877-886 ◽  
Author(s):  
E. K. S. Vijayakumar ◽  
T. S. Sudha ◽  
P. Balaram
Keyword(s):  
Circular Dichroism ◽  
Chain Length ◽  
Solvent Effects ◽  
Aminoisobutyric Acid ◽  
Circular Dichroïsm

Circular dichroism and infrared study of β-turn formation in repeat peptides of elastin

1987 ◽  
Vol 52 (5) ◽  
pp. 1356-1361
Author(s):  
S. Abdel Rahman ◽  
M. Elsafty ◽  
A. Hattaba
Keyword(s):  
Circular Dichroism ◽  
Solid State ◽  
Ir Spectra ◽  
Chain Length ◽  
Room Temperature ◽  
Infrared Study ◽  
Feature Characteristic ◽  
C 50 ◽  
The Stability ◽  
Circular Dichroïsm

The conformation of elastin-like peptides Boc-Ala-Pro-Gly-Val-APEGM, Boc-Ala-Pro-Gly-Val-Gly-Val-APEGM, Boc-Ala-Pro-Gly-Val-Ala-Pro-Gly-Val-Gly-Val-APEGM, Boc-Ala-Pro-Gly-Val-Gly-Val-Ala-Pro-Gly-Val-Gly-Val-APEGM were examined in solution using circular dichroism at 30 °C, 50 °C, and 70 °C and in solid state by IR at room temperature. The studies show that the β-turn is a significant conformational feature for peptides under investigation in solution at 30 °C and 50 °C, but at 70 °C the tetra, hexa, and decapeptides show the CD feature characteristic of the β-structure while the dodecapeptide spectra show the presence of β-turn which indicates the stability of the β-turn at this chain length. The IR spectra show that in the solid state at room temperature all investigated peptides assume essentially a β-turn except the tetrapeptide which present evidence of antiparallel β-structure. The β-turn contribution in the IR spectra increases with the increase of the chain length of the peptide.

Transmission of Point Chirality to Axial Chirality for Strong Circular Dichroism in Triarylmethylium-o,o-dimers

Synlett ◽  
2018 ◽  
Vol 29 (16) ◽  
pp. 2147-2154 ◽  
Author(s):  
Takanori Suzuki ◽  
Yusuke Ishigaki ◽  
Tomohiro Iwai ◽  
Yuki Hayashi ◽  
Aiichiro Nagaki ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Solvent Effects ◽  
Chiral Auxiliaries ◽  
Response Properties ◽  
Axial Chirality ◽  
Exciton Coupling ◽  
Π Stacking ◽  
Circular Dichroïsm

Triarylmethylium-o,o-dimers adopt a twisted geometry so that two diarylmethyliums are stacked in a slipped manner. Thus, chiral auxiliaries on the aryl groups induce a preference in the axial chirality of the central biphenyl unit. Strong circular dichroism is attained through exciton coupling, which can be used for additional spectral output in their electrochromic behavior. Diastereoselectivity based on π–π stacking exhibits unique solvent effects, thus endowing multifunctional response properties.

Electronic Circular Dichroism Spectroscopy of 1-(R)-Phenylethanol: The “Sector Rule” Revisited and an Exploration of Solvent Effects

2004 ◽  
Vol 44 (1-3) ◽  
pp. 27-36 ◽  
Author(s):  
Neil A. Macleod ◽  
Patrick Butz ◽  
John P. Simons ◽  
Guy H. Grant ◽  
Christopher M. Baker ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Solvent Effects ◽  
Circular Dichroism Spectroscopy ◽  
Electronic Circular Dichroism ◽  
Circular Dichroïsm

Chain length, temperature and solvent effects on the structural properties of α-aminoisobutyric acid homooligopeptides

2016 ◽  
Vol 18 (30) ◽  
pp. 20389-20398 ◽  
Author(s):  
Sonja Grubišić ◽  
Balasubramanian Chandramouli ◽  
Vincenzo Barone ◽  
Giuseppe Brancato
Keyword(s):  
Structural Properties ◽  
Chain Length ◽  
Solvent Effects ◽  
Conformational Equilibrium ◽  
Aminoisobutyric Acid ◽  
Main Factors

Main factors modulating the conformational equilibrium in Aib homopeptides.

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