668985-56-6Relevant articles and documents
Lanthanide-binding peptides with two pendant aminodiacetate arms: Impact of the sequence on chelation
Niedzwiecka, Agnieszka,Cisnetti, Federico,Lebrun, Colette,Gateau, Christelle,Delangle, Pascale
, p. 3239 - 3247 (2012)
Lanthanide complexes with a series of hexapeptides - incorporating two unnatural chelating amino acids with aminodiacetate groups, Ada1 and Ada2 - have been examined in terms of their speciation, structure, stability and luminescence properties. Whereas Ada2 acts as a tridentate donor in all cases, Ada1 may act as a tetradentate donor thanks to the coordination of the amide carbonyl function assisted by the formation of a six-membered chelate ring. The position of the Ada1 residue in the sequence is demonstrated to be critical for the lanthanide complex speciation and structure. Ada1 promotes the coordination of the backbone amide function to afford a highly dehydrated Ln complex and an S-shape structure of the peptide backbone, only when found in position 2. The Royal Society of Chemistry 2012.