. 2009 Apr 15;284(23):15607–15618. doi: 10.1074/jbc.M901601200

TABLE 3.

Dynamic parameters extracted from the field dependence of the³¹P spin-lattice relaxation time of diC₇PC and diC₆PC and the effect of PI-PLC enzymes

Sample^a	R_c (0)	τ_c	r_PH	S_c²	τ_hf, ps^b	R_v (0)	τ_v	θ_PH
	s⁻¹	ns	Å			s⁻¹	μs
rPI-PLC + diC₇PC	0.66 ± 0.05	6.9 ± 2.6	3.15	0.26	100	4.69 ± 1.23	0.22 ± 0.08	37.8°
3Y-S + diC₇PC	0.12 ± 0.03	1.2 ± 0.2	3.12	0.17	40	—^c	—^c	—^c
diC₇PC	0.58 ± 0.08	5.8 ± 1.7	3.12	0.14	150	1.94 ± 0.28	0.36 ± 0.08	45.6°
diC₆PC	0.13 ± 0.01	1.0 ± 0.5	2.99	0.13	60	—^c	—^c	—^c

^a The diC₇PC concentration was 3 mm; the diC₆PC concentration was 25 mm. The PI-PLC enzyme 3Y-S is the interfacial challenged triple mutant Y246S/Y247S/Y248S.

^b Errors in estimating τ_hfdepend on errors in the S_c²term and are likely to be 30–40%; hence, the value for each short-chain PC in the absence and presence of protein are essentially the same.

^c The very low field rise in R₁is only to about 0.4 s⁻¹; therefore, that we cannot accurately determine R_v(0) and τ_v(both are needed to derive θ_PH).