Effects of N-terminus substitution on the structure and spectroscopy of gas-phase helices
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For a comparison with the corresponding alpha- and beta-hexapeptides H-(Val-Ala-Leu)2-OH (A) and H-(beta-HVal-beta-HAla-beta-HLeu)2-OH (B), the corresponding gamma-hexapeptide (I), built from the homochirally similar (S)-4-aminobutanoate, (R)-4-amino-5-met ...
Proteolytic activation, oligomerization, and membrane insertion are three steps that precede channel formation by the bacterial toxin aerolysin. Using attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR) and hydrogen-deuterium exc ...
N-lithio-2,2,6,6-tetramethylpiperidine [Li(tmp)] reacts with AlX3 (X = Cl, Br) in Et2O/n-hexane soln. to generate of substitution and ether cleavage products, [(tmp)Al(X)(m-OEt)]2 (X = Cl, Br). However, when the reaction is allowed to proceed in n-hexane a ...
Enantiomerically pure beta-amino acid derivs. with the side-chains of Ala, Val, and Leu in the 2- or 3-position (β2- and β3-amino acids, resp.), as well as with substituents in both the 2- and 3-positions (β2,3-amino acids, of like-configuration) were prep ...
Using a model structure consisting of a network of corner sharing tetrahedra, we calculate the infrared spectrum of amorphous SiO2 within a first-principles approach and find good agreement with experiment both for the positions and the intensities of the ...
A serotonin 5-HT3 receptor was functionally expressed to high levels and on a large scale in mammalian cells with the Semliki Forest virus system. Conditions were optimized to maximize detergent solubilization of the receptor, while preserving ligand bindi ...
A review with 37 refs. In the present review, various attempts to apply synthetic tools for inducing native-like structural features in peptides in order to bypass the folding problem are described. Besides well-established methods for the nucleation and s ...
A 16-membered tetrapeptide macrocycle I, an analog of the vancomycin binding pocket, has been designed and synthesized using the efficient macrocyclization of the corresponding linear tetrapeptide via biaryl ether formation. In acetone, I adopted a right c ...
A simple approach to the in situ measurement of IR spectra of self-assembled monolayers (SAMs) on gold in an aq. environment is described. A thin gold film (3-5 nm) on the surface of a germanium internal reflection element is used as a substrate for the se ...
beta-Hexapeptides and a beta-dodecapeptide with sequences contg. two different types of beta-amino acids, aliph. proteinaceous side-chains in 2- or 3-position, were studied with CD and NMR measurements. With one exception, the secondary structures formed b ...
