Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pseudoproline (also pseudo-proline, -Pro) derivatives are artificially created dipeptides to minimize aggregation during FMOC solid-phase synthesis of peptides. The chemical synthesis of large peptides is still limited by problems of low solvation during solid phase peptide synthesis (SPPS) or limited solubility of fully protected peptide fragments: even chemoselective ligation methods are hampered by self-association of unprotected peptide blocks. The elucidation of the relationship between preferred conformation of a growing peptide chain and its physicochemical properties reveals that -sheet (beta-sheet) formation is often paralleled by significant decrease in solvation and solubility. Besides attempts to increase the solvation of peptides by external factors, few attempts, i.e. N-substituted Hmb amino acid derivatives and pseudoprolines (see figure on the top right) have been reported to modify the intrinsic properties of peptides responsible for aggregation and secondary structure formation.

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