Table 3.

Structural parameters of [(mepFlpGly)₇]₃ and other crystalline triple helices

Parameter	[(mepFlpGly)7]3*	[(ProHypGly)10]3†	[(ProProGly)10]3‡
resolution (Å)	1.21	1.26	1.3
interstrand hydrogen bond (Å)	2.97 ± 0.06	2.88	3.04 ± 0.01
helical pitch	7/2	7/2	7/2
ϕ, Xaa position (deg)	-76.0 ± 4.1	-71.3 ± 1.4	-74.5 ± 2.9
ψ, Xaa position (deg)	164.7 ± 3.9	161.5 ± 1.1	164.3 ± 4.1
ω, Xaa position (deg)	180.12 ± 2.7	172.3 ± 1.0	176.0 ± 2.5
ϕ, Yaa position (deg)	-60. ± 1.5	-56.9 ± 1.3	-60.1 ± 3.6
ψ, Yaa position (deg)	151.3 ± 3.6	150.0 ± 1.1	152.4 ± 2.6
ω, Yaa position (deg)	176.0 ± 1.3	174.7 ± 1.1	175.4 ± 3.4
ϕ, Gly (deg)	-71.5 ± 2.6	-71.3 ± 1.6	-71.7 ± 3.7
ψ, Gly (deg)	176.8 ± 4.3	174.2 ± 1.2	175.9 ± 3.1
ω, Gly (deg)	175.3 ± 2.3	178.8 ± 1.1	179.7 ± 2.0
rmsd (Å)§	—	0.2195	0.2320

^*Values are averaged from the central thirty-six amino acids in the center of each triple helix in the asymmetric unit.

^†From ref. 42.

^‡From ref. 35.

^§, where n is the number of main-chain atoms (N, C^α, C^′, and O^′) in the central core 7 residues of each strand, and x is their absolute position.