28529-34-2Relevant articles and documents
Kinetics and mechanism of the peptide synthesis in solution
Permyakov,Permyakov,Medvedkin
, p. 9 - 13 (2002)
The kinetics of the reaction of Boc-Xaa fluorophenyl esters (where Xaa = Ala, Val, Phe, Ser, Leu, Gly, Met, Pro, or Ile) with leucinamide was studied in order to measure changes in fluorescence emission at 375 nm of the fluorophenyl chromophore accompanying the reaction. It was found that the experimental kinetic data could not be described by a simple scheme of the second order reaction. Measurements of the kinetic parameters of the reaction at various initial concentrations of reagents indicated that the reaction rate can be expressed as: v = kCNaCAEb, where k is the reaction rate constant, CN is the concentration of leucinamide, and CAE is the concentration of fluorophenyl ester. The a and b reaction orders were close to 1/2 and 3/2 for Xaa = Ala, Val, Phe, Ser, or Leu, 1/2 and 1 for Gly, Met, or Pro, and 1 and 2 for Ile. The experimental equations for the reaction rate can theoretically be derived from a single scheme of chain reactions with various deactivation ways for active intermediates.
Interactions between Terminally Substituted Amino Acids in an Aqueous and a Non-Aqueous Environment. Enthalpic Interaction Coefficients in Water and in N,N-Dimethylformamide at 25 deg C
Kent, Hilary E.,Lilley, Terence H.,Milburn, Peter J.,Bloemendal, Michael,Somsen, Gus
, p. 101 - 116 (2007/10/02)
Enthalpies of dilution of the N-acetyl amides of glycine, L-alanine, L-valine, L-leucine, and L-phenylalanine, dissolved in N,N-dimethylformamide (DMF) as a solvent have been measured at 25 deg C.The results obtained have been analyzed to give the enthalpic interaction (or virial) coefficients of the solutes and these are compared with information previously obtained in aqueous systems.There are marked differences in the interaction properties in the two solvents and, while the additivity approache of Savage and Wood is applicable to the solutes in water it is suitable for representing the interactions in DMF.A correlation is presented between the enthalpic second virial coefficients in DMF and the propensity of side-chains to be in proximity in globular proteins.
Aqueous Solutions Containing Amino Acids and Peptides. Part 11.-Enthalpy of Dilution of Single and Binary Solute Solutions of N-Acetylglycine Amide, N-Acetyl-L-alanine Amide, N-Acetyl-L-valine Amide and N-Acetyl-L-leucine Amide at 298.15 K
Blackburn, G. Michael,Lilley, Terence H.,Walmsley, Elizabeth
, p. 915 - 922 (2007/10/02)
The enthalpies of dilution of aqueous solutions containing N-acetylglycine amide (G), N-acetyl-L-alanine amide (A), N-acetyl-L-valine amide (V) and N-acetyl-L-leucine amide (L) and equimolal solutions of G+A, G+V, G+L, A+V, A+L and V+L have been measured at 298.15 K.The results obtained have been used to calculate the pairwise enthalpy coefficients for like-like and like-unlike solute interactions.These coefficients have been compared with the predictions of the group additivity approach proposed earlier by Savage and Wood.The group additivity approach works well considering the experimental error and the standard deviation of the original correlations although it seems likely that some refinement of the group interaction parameters is required.
