Copper(II)-Catalyzed Disulfide Scission—Stepwise Aerobic Oxidative Cleavage to Sulfinate and Sulfonate and Reductive Anaerobic Cleavage to Thiols

Investigating the Functional Role of the Cysteine Residue in Dehydrin from the Arctic Mouse-Ear Chickweed Cerastium arcticum

The stress-responsive, SK₅ subclass, dehydrin gene, CaDHN, has been identified from the Arctic mouse-ear chickweed Cerastium arcticum. CaDHN contains an unusual single cysteine residue (Cys143), which can form intermolecular disulfide bonds. Mutational analysis and a redox experiment confirmed that the dimerization of CaDHN was the result of an intermolecular disulfide bond between the cysteine residues. The biochemical and physiological functions of the mutant C143A were also investigated by in vitro and in vivo assays using yeast cells, where it enhanced the scavenging of reactive oxygen species (ROS) by neutralizing hydrogen peroxide. Our results show that the cysteine residue in CaDHN helps to enhance C. arcticum tolerance to abiotic stress by regulating the dimerization of the intrinsically disordered CaDHN protein, which acts as a defense mechanism against extreme polar environments.

Zn/Cu Complexes Constructed through Selective in Situ Br−Cl Exchange: Synthesis, Structures, Properties, and DFT Insights into the Cu-Catalyzed Mechanism

Two coordination polymers (CPs) [Cu2(L1)(µ3-OH)(H2O)]n (1) and {[Zn4(L)2(4,4′-bipy)3]•4H2O}n (2) were synthesized under solvothermal conditions. It is unexpectedly found the transformation of aryl−Br to aryl−Cl (Br-Cl exchange) in the formation of...

The crystal structure of N,N′-(Disulfanediyldi-2,1-phenylene)di(6′-methylpyridine)-2-carboxamide, C26H22N4O2S2

C26H22N4O2S2, triclinic, P 1 ‾ $P‾{1}$ (no. 2), a = 7.9495(7) Å, b = 11.2494(12) Å, c = 13.7829(13) Å, α = 81.433(2)°, β = 76.536(1)°, γ = 82.641(2)°, V = 1179.7(2) Å3, Z = 2, R gt (F) = 0.0727, wR ref(F 2) = 0.2189, T = 298(2) K.

AIBN-Promoted Synthesis of Bibenzo[ b][1,4]thiazines by the Condensation of 2,2'-Dithiodianiline with Methyl Aryl Ketones

A series of bibenzo[ b][1,4]thiazines with various functional groups has been synthesized by a free-radical condensation reaction. Bibenzo[ b][1,4]thiazines were obtained in moderate to good yield (up to 85%) through a one-step reaction of readily available 2,2'-dithiodianiline and methyl aryl ketones with AIBN as radical initiator in HOAc. Bibenzo[ b][1,4]thiazines exhibit diversiform solid-state packing.

The role of intermolecular interactions involving halogens in the supramolecular architecture of a series of Mn(ii) coordination compounds

This study reveals the role of halogen-involving interactions in structural changes of supramolecular assemblies of manganese(ii) complexes including N-(4-halo)phenyl picolinamide ligands.

A simultaneous disulfide bond cleavage, N,S-bialkylation/N-protonation and self-assembly reaction: syntheses, structures and properties of two hybrid iodoargentates with thiazolyl-based heterocycles

Unprecedented multiple in situ reactions were found during preparation of hybrid iodoargentates.

Crystal structure of N-(2-{[2,6-bis-(2,2,2-tri-fluoro-acetamido)-phen-yl]disulfan-yl}-3-(2,2,2-tri-fluoro-acetamido)-phen-yl)-2,2,2-tri-fluoro-acetamide

The title compound, C20H10F12N4O4S2, is an organic diaryl di-sulfide compound with tri-fluoro-acetamide substituents at the ortho-positions of each benzene ring. There are two mol-ecules (labeled A and B) in the asymmetric unit. The F atoms of three of the -CF3 groups exhibit rotational disorder over two positions each. The S-S bond distances are 2.0914 (7) and 2.0827 (6) Å for mol-ecules A and B, respectively. The dihedral angle between the S-S-C and S-C-C planes is 103.05 (15)° for mol-ecule A and 104.09 (15)° for mol-ecule B. The three-dimensional supra-molecular architecture of the crystal is sustained by numerous N-H⋯O, N-H⋯S and C-H⋯O inter-actions.

Self-triggered conformations of disulfide ensembles in coordination polymers with multiple metal clusters

Five coordination polymers containing manganese(ii) ions, 6,6′-dithiodinicotinate, and/or N-donor coligands display mononuclear, trinuclear cluster and polymeric metal oxide wire and exhibit intrinsic biomimetic characteristics.