37941-52-9Relevant articles and documents
Co-ordination Properties of Cyclopeptides. Formation and Stability of Zinc(II) and Copper(II) Complexes of Histidine-containing Cyclopeptides, or Imidazole
Arena, Giuseppe,Impellizzeri, Giuseppe,Maccarrone, Giuseppe,Pappalardo, Giuseppe,Rizzarelli, Enrico
, p. 1227 - 1230 (1994)
In order to obtain an improved understanding of the complexing properties of cyclopeptides involved in biological processes, the interaction of zinc(II) with cyclo(L-histidyl-L-histidyl) was studied by potentiometric and calorimetric techniques in aqueous solution.Comparison between the thermodynamic parameters of the complexes formed with those for analogous species formed with cyclo(glycyl-L-histidyl) allowed evidence to be obtained for the formation of chelate rings of unusual size.The thermodynamic quantities associated with copper(II) complex formation with cyclo(-Gly-His-) were determined.The role of the different stereochemical requirements of copper(II) and zinc(II) in the formation of large chelate rings was assessed by means of previously reported data concerning the copper(II)-cyclo(-His-His-) complexes.
Protease-catalysed synthesis of peptides containing histidine and lysine
Beck-Piotraschke, Karin,Jakubke, Hans-Dieter
, p. 1505 - 1518 (2007/10/03)
The kinetically controlled α-chymotrypsin- and trypsin-catalysed syntheses of peptides starting from simple acyl donor esters containing histidine at the P1-position (nomenclature according to Schechter and Berger) and lysine derivatives as amino components were examined on the basis of their kinetic parameters. Despite higher specificity constants (k(cat)/K(M)) of trypsin-catalysed ester hydrolysis, α-chymotrypsin- catalysed acyl transfer to N(ε)unprotected lysine derivatives gave higher peptide yields as compared to trypsin-catalysed reactions, whereas in acyl transfer to N(ε)-protected lysine derivatives the trypsin-catalysed reaction gave higher yields. α-Chymotrypsin-catalysed acyl transfer reactions in frozen systems demonstrated the yield-enhancing effect of freezing. Using specific ester leaving groups, both the amount of enzyme and the reaction time can be reduced. In frozen systems the ε-amino function of H-Lys-OH acts as an acyl acceptor at pH ≤9.
Acid dissociation constants of some histidine containing peptides and formation constants of their metal complexes
Yokoyama,Aiba,Tanaka
, p. 112 - 117 (2007/10/04)
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