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O-Acetylserine sulfhydrylase (OASS) is a pyridoxal 5′-phosphate (PLP)-dependent enzyme that catalyzes the conversion of O-acetylserine and bisulfide to l-cysteine and acetate in bacteria and higher plants. Enteric bacteria have two isozymes of OASS, A and B, produced under aerobic and anaerobic growth conditions, respectively, with different substrate specificities. The 31 P chemical shift...
The torsion angles of the OC–CO bonds in crystalline poly(ethylene oxide), PEO, were investigated by solid-state nuclear magnetic resonance (NMR). Two-dimensional double-quantum (DOQSY) spectra indicate that the OC–CO bonds are all gauche with an average torsion angle of ψ=74±4° and a narrow torsion-angle distribution, σ ψ <8°. This is contradictory to the wider range of gauche torsion...
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