Unusual 1H NMR chemical shifts support (His) Cepsilon 1---H{middle dot}{middle dot}{middle dot}O==C H-bond: Proposal for reaction-driven ring flip mechanism in serine protease catalysis -- Data Supplement - Supplemental Data -- Proceedings of the National Academy of Sciences

Supplementary material for Ash et al. (2000) Proc. Natl. Acad. Sci. USA 97 (19), 10371-10376.

GIF Image

Fig. 5. Schematic diagram of the coordinate system employed in this paper for calculating peptide group anisotropic shielding of neighboring C^e ¹-H protons. Origins vary from model to model.