8dyk

Room temperature neutron structure of a fluorescent Ag8 cluster templated by a multistranded DNA scaffold

spinqualitylabelsall models 8dyk, resolution 2.10Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8dyk is a 2 chain structure with sequence from Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Neutron Diffraction, Resolution 2.1Å Ligands: AG Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed When strands of DNA encapsulate silver clusters, supramolecular optical chromophores develop. However, how a particular structure endows a specific spectrum remains poorly understood. Here, we used neutron diffraction to map protonation in (A(2)C(4))(2)-Ag(8), a green-emitting fluorophore with a "Big Dipper" arrangement of silvers. The DNA host has two substructures with distinct protonation patterns. Three cytosines from each strand collectively chelate handle-like array of three silvers, and calorimetry studies suggest Ag(+) cross-links. The twisted cytosines are further joined by hydrogen bonds from fully protonated amines. The adenines and their neighboring cytosine from each strand anchor a dipper-like group of five silvers via their deprotonated endo- and exocyclic nitrogens. Typically, exocyclic amines are strongly basic, so their acidification and deprotonation in (A(2)C(4))(2)-Ag(8) suggest that silvers perturb the electron distribution in the aromatic nucleobases. The different protonation states in (A(2)C(4))(2)-Ag(8) suggest that atomic level structures can pinpoint how to control and tune the electronic spectra of these nanoscale chromophores. Mapping H(+) in the Nanoscale (A(2)C(4))(2)-Ag(8) Fluorophore.,David F, Setzler C, Sorescu A, Lieberman RL, Meilleur F, Petty JT J Phys Chem Lett. 2022 Dec 8;13(48):11317-11322. doi: , 10.1021/acs.jpclett.2c03161. Epub 2022 Dec 1. PMID:36453924 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

Proteopedia Page Contributors and Editors (what is this?)

OCA