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Accumulating evidence has linked G-quadruplex structures to a number of biological processes in vivo, including DNA replication, transcription, and genomic maintenance. However, the precise function and mechanism of G-quadruplex formation in mammalian cells remains poorly defined. Therefore, the development of small-molecule G-quadruplex probes has attracted significant attention in recent years....
The final step in the biosynthesis of the plant signaling molecule ethylene is catalyzed by 1-aminocyclopropane-1-carboxylic acid oxidase (ACCO). ACCO requires bicarbonate as an activator and catalyzes the oxidation of ACC to give ethylene, CO 2 , and HCN. We report crystal structures of ACCO in apo-form (2.1 Å resolution) and complexed with Fe(II) (2.55 Å) or Co(II) (2.4 Å). The active site...
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