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Bioorganic & medicinal chemistry letters • 2001 | View Paper
“In contrast, the l-Arg guanidinium interacts more weakly and equally with both NO atoms, and an active-site water molecule hydrogen bonds to the distal NO oxygen.”
“This indicates that the complex is stabilized by 14 kJmol–1 in the presence of substrate, consistent with a strong H-bonding interaction between NO and the guanidino group.”