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- W2065013346 abstract "Chiral recognition of unsolvated biomolecules by enzymes requires a dynamic model. The amine-induced loss of representative amino acids from a chiral amido[4]resorcinarene receptor (shown as a CPK model in the picture), investigated in the gas phase by ESI-FT-ICR mass spectrometry, exhibits pronounced enantioselectivity with respect to both the leaving amino acid and the incoming amine. For example, whereas D-serine prefers to remain in the down region of the host, L-serine can relocate to the almost degenerate ext region (picture left). Molecular recognition of representative amino acids (A) by a chiral amido[4]resorcinarene receptor (1L) was investigated in the gas phase by ESI-FT-ICR mass spectrometry. The ligand displacement reaction between noncovalent diastereomeric [1L⋅H⋅A]+ complexes and the 2-aminobutane enantiomers (B) exhibits a distinct enantioselectivity with regard to both the leaving amino acid A and the amine reactant B. The emerging selectivity picture, discussed in the light of molecular mechanics and molecular dynamics calculations, points to chiral recognition by 1L, as determined by the effects of the host asymmetric frame on the structure, stability, and rearrangement dynamics of the diastereomeric [1L⋅H⋅A]+ complexes and the orientation of the amine reactant B in encounters with [1L⋅H⋅A]+. The results contribute to the development of a dynamic model of chiral recognition of biomolecules by enzyme mimics in the unsolvated state. La spettrometria di massa ESI-FT-ICR è stata impiegata per lo studio del riconoscimento chirale di alcuni amminoacidi rappresentativi (A) da parte di un ammido[4]resorcinarene chirale (1L). La reazione di rilascio dell′amminoacido A dai complessi diastereomerici non covalenti [1L⋅H⋅A]+ a seguito dell′attacco degli enantiomeri del 2-amminobutano (B) mostra una distinta enantioselettività sia per quanto riguarda la molecula uscente A che per quanto riguarda il reagente B. Il quadro di reattività ottenuto, discusso alla luce di calcoli di meccanica e dinamica molecolare, indica che il riconoscimento chirale da parte di 1L è determinato dall′effetto della struttura asimmetrica dell′ ammido[4]resorcinarene sulla struttura, la stabilità, e la dinamica di riarrangiamento dei suoi complessi diastereomerici [1L⋅H⋅A]+ e dall′ orientamento dell′ammina reagente B nel complesso di collisione con [1L⋅H⋅A]+. I risultati ottenuti contribuiscono allo sviluppo di un modello dinamico per il riconoscimento chirale di biomolecole da parte di enzimi artificiali allo stato non solvatato. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2111/2004/f305772_s.pdf or from the author. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article." @default.
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- W2065013346 date "2004-09-06" @default.
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- W2065013346 title "Chiral Recognition by Resorcin[4]arene Receptors: Intrinsic Kinetics and Dynamics" @default.
- W2065013346 doi "https://doi.org/10.1002/chem.200305772" @default.
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