TABLE 3.

Comparison of the L-type and RyR Ca²⁺ channels and mutant OmpF

Ca2+ channel type	Volume nm3	g in CaCl2 pS	DNa/DCa in filter	PCa/PNa	[Ca2+] to reduce g by 50%
L-type*	0.375	10 (saturated)	20	100	≈1 μM
RyR†	0.380	150 (in 50 mM)	≈10	5–7	≈5 mM
(L)EAE	2	158 (in 100 mM)‡	10	3–4¶	>1 mM

^*See Nonner and Eisenberg (1998) and references therein.

^†See Chen et al. (2003) and references therein.

^‡Monomeric conductance, see Fig. 8A.

^¶This study, under biionic conditions, 0.1 M NaCl // 0.1 M CaCl₂, pH 7.4 (unpublished results).