title: Explaining the highly enantiomeric photocyclodimerization of 2-anthracenecarboxylate bound to human serum albumin using time-resolved anisotropy studies.
abstract: The mechanism for the high enantiomeric excess (ee) (80-90%) observed in the photocyclodimerization of 2-anthracenecarboxylate (AC) in the chiral binding sites of human serum albumin (HSA) was studied using fluorescence anisotropy. A long rotational correlation time of 36 ns was observed for the excited states of the ACs bound to the HSA site responsible for the high ee, suggesting that the ACs have restricted rotational mobility in this site. The ACs in this site have the same prochiral face protected by the protein, and this protection is responsible for the high ee observed. These insights provide a strategy for the rational design of supramolecular photochirogenic systems.
authors.affiliation: Department of Chemistry, University of Victoria, P.O. Box 3065, Victoria, British Columbia, Canada V8W 3 V6.
authors.forename: Denis
authors.initials: D
authors.lastname: Fuentealba
authors.forename: Hanako
authors.initials: H
authors.lastname: Kato
authors.forename: Masaki
authors.initials: M
authors.lastname: Nishijima
authors.forename: Gaku
authors.initials: G
authors.lastname: Fukuhara
authors.forename: Tadashi
authors.initials: T
authors.lastname: Mori
authors.forename: Yoshihisa
authors.initials: Y
authors.lastname: Inoue
authors.forename: Cornelia
authors.initials: C
authors.lastname: Bohne
mesh_terms: D016880:Anisotropy; D000873:Anthracenes / Q000737:chemistry*; D002264:Carboxylic Acids / Q000737:chemistry*; D003500:Cyclization; D019281:Dimerization; D005453:Fluorescence; D006801:Humans; D015394:Molecular Structure; D055668:Photochemical Processes; D012709:Serum Albumin / Q000737:chemistry*; D013237:Stereoisomerism; D013997:Time Factors
chemical_list: C476641:2-anthracenecarboxylate; D000873:Anthracenes; D002264:Carboxylic Acids; D012709:Serum Albumin