Table 2. Intrahelical angles and distances for Ca²⁺-S100A1 and other Ca²⁺-S100 structures.

Intrahelical angles and distances were calculated using UCSF Chimera and previously established methods (Drohat et al., 1998 ▸).

		Intrahelical angles (°)						Intrahelical distances (Å)
	R.m.s.d. (Å)	I to II	I to III	I to IV	II to III	II to IV	III to IV	I to II	I to III	I to IV	II to III	II to IV	III to IV
S100A1 (X-ray)†	0.5	140.0	−116.5	127.4	103.4	−28.8	110.2	8.1	16.8	11.3	9.9	13.9	9.1
S100A1 (NMR)‡	2.6	133.3	−106.5	129.4	117.5	−33.0	119.7	9.8	19.5	13.4	10.2	12.4	8.5
S100A1–RyRP (NMR)§	2.5	137.8	−94.4	123.5	121.5	−40.6	137.2	9.7	19.3	12.4	10.4	12.6	9.9
S100A4 (X-ray)¶	1.5	140.2	−112.6	131.3	106.2	−34.9	108.5	8.1	17.2	11.1	10.0	13.6	8.8
S100B (X-ray)††	1.0	138.7	−126.6	126.7	93.8	−36.6	100.1	8.7	17.3	11.0	9.5	13.9	9.0
S100B (NMR)‡‡	2.9	131.9	−124.0	124.3	103.4	−38.7	103.1	10.4	20.1	12.1	10.2	13.2	9.9
S100Z (X-ray)§§	0.7	136.2	−107.6	131.8	116.2	−25.6	112.7	7.6	17.0	11.2	9.7	12.7	8.9

^†The r.m.s.d. for the S100A1 crystal structure corresponds to the average alignment of each monomer in the asymmetric unit.

^‡Calculated using PDB entry 1zfs (Wright et al., 2005 ▸).

^§Calculated using PDB entry 2k2f (Wright, Prosser et al., 2008 ▸).

^¶Calculated using PDB entry 2q91 (Malashkevich et al., 2008 ▸).

^††Calculated using PDB entry 1mho (Matsumura et al., 1998 ▸).

^‡‡Calculated using PDB entry 2k7o (Wright, Inman et al., 2008 ▸).

^§§Calculated using PDB entry 2y5i (Moroz et al., 2011 ▸).