Table 2.

Comparison of selected dihedral angles

Dihedral angles	PGRP-Iβ C–GMPP	GMPP2	PGN monomer
NAG-NAM-φ	163	173	174
NAG-NAM-ψ	161	126	118
d-Lac-ψ	67	61	66
d-Lac-φ	−157	−91	−159

Definitions for dihedral angles are as follows: NAG-NAM-φ, C2(NAG₁)–C1(NAG₁)–O1(NAG₁)–C4(NAM₁); NAG-NAM-ψ, C1(NAG₁)–O1(NAG₁)–C4(NAM₁)–C3(NAM₁); d-Lac-ψ, N2(NAM₂)–C2(NAM₂)–C3(NAM₂)–O3(NAM₂); and d-Lac-φ, C4(NAM₂)–C3(NAM₂)–O3(NAM₂)–C9(d-lactyl). GMPP₂ data are for the NMR structure of GMPP₂ (17). PGN monomer data are for the NMR structure of Dap-type PGN monomer (NAG-NAM-l-Ala-γ -d-Gln-Dap-d-Ala-d-Ala) (29).