Metal-peptide rings form highly entangled topologically inequivalent frameworks with the same ring- and crossing-numbers.

ABSTRACT: With increasing ring-crossing number (c), knot theory predicts an exponential increase in the number of topologically different links of these interlocking structures, even for structures with the same ring number (n) and c. Here, we report the selective construction of two topologies of 12-crossing peptide [4]catenanes (n = 4, c = 12) from metal ions and pyridine-appended tripeptide ligands. Two of the 100 possible topologies for this structure are selectively created from related ligands in which only the tripeptide sequence is changed: one catenane has a T₂-tetrahedral link and the other a three-crossed tetrahedral link. Crystallographic studies illustrate that a conformational difference in only one of the three peptide residues in the ligand causes the change in the structu

SUBMITTER: Sawada T 

PROVIDER: S-EPMC6384881 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature