203739-34-8Relevant articles and documents
Conjugates of modified cryptophycins and RGD-peptides enter target cells by endocytosis
Nahrwold, Markus,Wei?, Christine,Bogner, Tobias,Mertink, Felix,Conradi, Jens,Sammet, Benedikt,Palmisano, Ralf,Royo Gracia, Soledad,Preu?e, Thomas,Sewald, Norbert
supporting information, p. 1853 - 1864 (2013/05/09)
Tumor targeting anticancer drug conjugates that contain a tumor recognition motif (homing device) are of high current relevance. Cryptophycins, naturally occurring cytotoxic cyclo-depsipeptides, have been modified by total synthesis to provide analogues suitable for conjugation to peptide-based homing devices. An array of functionalized β2-amino acids was synthesized and incorporated into cryptophycins. All analogues proved to be highly active in the cytotoxicity assay using the human cervix carcinoma cell line KB-3-1 and its multidrug-resistant subclone KB-V1. Conformational analysis of cryptophycin-52 and two synthetic analogues was performed by NMR and MD methods to obtain information on the influence of the unit C configuration on the overall conformation. An azide-functionalized cryptophycin was connected by CuAAC to an alkyne-containing fluorescently labeled cyclic RGD-peptide as the homing device for internalization studies. Confocal fluorescence microscopy proved integrin-mediated internalization by endocytosis and final lysosomal localization of the cryptophycin prodrug.
Effect of progressive benzyl substitution on the conformations of aminocaproic acid-cyclized dipeptides
MacDonald,Vander Velde,Aube
, p. 2636 - 2642 (2007/10/03)
The constraint of dipeptides into a β-turn conformation can be accomplished by linking the two ends of a standard dipeptide with a linker derived from aminocaproic acid (aca). To elucidate the possibility of using substituted Aca linkers in peptidomimetic design, a series of five macrocycles composed of a monobenzylated Aca linker (containing the benzyl group on each of the five methylene groups of the parent linker) and Gly-gly were synthesized. The requisite linkers were made by regiochemically controlled ring expansion techniques (for substitution on Aca positions C-3, C-4, or C-5), an Evans alkylation route (for C-2), or by chain extension of L-phenylalanal (for C-6). The solution-phase conformations of the macrocycles were examined by Nmr and Cd techniques; in addition, crystal structures of the C-4- and C-6-benzyl-substituted linkers were obtained. Four out of the five macrocycles were found to exist with the dipeptide portion taking up either a type Ii or Ii′ β-turn conformation, but the Gly-gly unit in the compound derived from 4-benzyl-aca did not correspond to one of the standard β-turn types.
