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Signal transduction by the global regulator RegB is mediated by a redox‐active cysteine
TLDR
Mutational analysis indicates that a cysteine residue flanked by cationic amino acids is involved in redox sensing in vitro and in vivo and appears to constitute a novel ‘redox‐box’ that is present in sensor kinases from diverse species of bacteria.
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Spectroscopic and mutational analysis of the blue-light photoreceptor AppA: a novel photocycle involving flavin stacking with an aromatic amino acid.
TLDR
It is proposed that photochemical excitation of the flavin results in strengthening of a hydrogen bond between the Flavin and Tyr 21 leading to a stable local conformational change in AppA, a blue-light photoreceptor in the purple bacterium Rhodobacter sphaeroides.
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Convenient, Rapid Synthesis of Ag Nanowires
The rapid, microwave-assisted aerobic synthesis of silver nanowires based on the polyol method is described. Benchtop dissolution of NaCl and AgNO3 (ratio 1:6 to 1:3) in ethylene glycol and…
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Reexamination of lead(II) coordination preferences in sulfur-rich sites: implications for a critical mechanism of lead poisoning.
TLDR
Detailed structural studies of Pb(II) in structural zinc-binding protein sites are reported, providing critical insights into the mechanism by which lead alters the activity of these proteins, providing the first detailed molecular understanding of the developmental toxicity of lead.
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Metal complex-DNA interactions: from transcription inhibition to photoactivated cleavage.
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Bimolecular Electron Transfer in the Marcus Inverted Region
The rates for the photoinduced bimolecular reactions of a homologous series of RuII diimines with cytochrome (cyt) c in its oxidized and reduced forms have been measured. The electronic coupling and…
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Metallotherapeutic Drugs and Metal‐Based Diagnostic Agents. The Use of Metals in Medicine. Edited by Marcel Gielen and Edward R. T. Tiekink.
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Expansion by contraction: diversifying the photochemical reactivity scope of diazo-oxochlorins toward development of in situ alkylating agents.
TLDR
The ability of these chromophores to photochemically react under substrate control may make unimolecular porphyrinoid photoreagents such as these useful for applications in photobiology or O2-independent photodynamic therapy.
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Elucidation of the extraordinary 4-membered pyrrole ring-contracted azeteoporphyrinoid as an intermediate in chlorin oxidation.
Reaction of 2,3-dioxochlorins with benzeneselenic anhydride (BSA) results in the formation of unusual ring-contracted azetine derivatives that further react with BSA to afford porpholactones.
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Spectroscopic studies of the effect of ligand donor strength on the Fe-NO bond intradiol dioxygenases.
TLDR
The weaker Fe-NO bond derives from the strong donor interaction of the endogenous phenolate and substrate catecholate ligands, which is observed from the increased intensity in the CT region relative to that of [FeNO]7 model complexes, and from the shift in XAS edge position to lower energy.
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