Cysteine co-oxidation process driven by native peptide folding: an example on HER2 receptor model system.
Synthetic models of receptors that have relevant biological roles are valuable tools for studying receptors itself and the corresponding ligands. Their properties can be validated at first by their capacity to fold in solution under native-like conditions and to assume conformations structurally and functionally equivalent to those in the native receptor. In this context, a new strategy to prepare the two-fragments synthetic receptor model HER2-DIVMP, an independent structural and functional motif of HER2, has been developed and the folding properties have been investigated. The strategy is based on a one-step cysteine co-oxidation procedure in slightly alkaline aqueous buffers, whereby the two separate peptide chains are allowed to self-assemble in solution. Under these conditions, the two chains spontaneously form the expected heterodimer with the correct pattern of disulfide bridges. To gain insights on the folding mechanism, we investigated the folding of two scrambled variants of the constituent peptide chains.
Institute of Biostructures and Bioimaging, National Research Council, 80134, Naples, Italy.
Enrica
E
Calce
Annamaria
A
Sandomenico
Michele
M
Saviano
Menotti
M
Ruvo
Stefania
S
De Luca
D000595:Amino Acid Sequence; D003545:Cysteine / Q000737:chemistry* / Q000378:metabolism; D019281:Dimerization; D008969:Molecular Sequence Data; D010084:Oxidation-Reduction; D017510:Protein Folding; D018719:Erb-b2 Receptor Tyrosine Kinases / Q000737:chemistry* / Q000378:metabolism
D003545:Cysteine; D018719:Erb-b2 Receptor Tyrosine Kinases; C508053:ERBB2 protein, human