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An ir‐absorption and Raman‐scattering study, in the solid state, has been carried out on monodispersed, N‐ and C‐protected homooligopeptides (number of residues, n, from 2 to 7) of L‐valine, L‐isoleucine, and L‐phenylalanine. The amide I, II, III, V, and vNH regions have been...
The 1H‐nmr chemical shifts and the spin–spin coupling constants of the common amino acid residues were measured in solutions of the linear tetrapeptides H‐Gly‐Gly‐X‐L‐Ala‐OH in D2O and H2O, the influence of X on the nmr parameters of the neighboring residues Gly 2 and Ala 4 was...
This paper shows that backbone amide proton titration shifts in polypeptide chains are a very sensitive manifestation of intramolecular hydrogen bonding between carboxylate groups and backbone amide protons. The population of specific hydrogen‐bonded structures in the ensemble of species that...
Linear response theory in the decorrelation or random‐phase approximation is used to calculate the absorption and CD spectra of model helical polymers, including single‐stranded polyadenylic acid. The method, which makes use of infinite polymer selection rules for the linear response tensor,...
The vacuum‐uv CD of agarose solid films has been measured to 145 nm and shows a positive band near 180 nm and a larger negative band at around 152 nm. The positive band remains accessible in aqueous solution and has been used to characterize changes in molecular conformation and interaction...
The deacylation of acetylsalicylate and of adipoyldisalicylate in the presence of modified and unmodified poly(ethylenimine)s has been investigated. The kinetics of these reactions have been analyzed in terms of an initial binding step followed by one or two aminolysis steps, and the relevant...
The conventionally protected oligopeptides of the two homologous series Boc‐(L‐Ile)n‐OMe and Boc‐(D‐aIle)n‐OMe (n = 2–6) were synthesized in a standard stepwise fashion and their uv and CD spectra in 2,2,2‐trifluoroethanol, and solid‐state ir spectra were investigated. In...
The stepwise synthesis and conformational studies of the N‐terminal helical partial sequence of the membrane‐modifying polypeptide antibiotic alamethicin are described. The polyoxyethylen esters of the fragments N‐t‐Boc‐L‐Pro‐Aib‐Ala‐Gln‐Aib‐Val‐Aib‐Gly‐OH and...
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