Table 2.

The distance from the threonine oxygen to neighboring oxygen atoms and the angle between the O-O vector and the membrane normal

Residue	Distance, Å; angle, degree						IR, degree
	2BRD* [5]	2AT9* [7]	1QHJ† [9]	1C3W† [11]	1BRR† [12]	1BM1† [13]
Thr-17							65
O of Leu-13	2.86; 73.5	3.54; 51.0	2.72; 67.9	2.72; 70.4	2.56; 70.5	3.10; 70.6
							26
Thr-90
O of Trp-86	2.83; 64.6	2.57; 23.0	2.55; 53.0	2.54; 57.4	2.50; 50.1	2.84; 64.1
S.C. O of Asp-115‡			2.72; 67.9	2.40; 75.8	2.50; 80.9
Thr-121
O of Ile-117	2.84; 50.9	2.74; 31.7	2.59; 45.6	2.59; 45.8	2.94; 48.1	3.17; 48.4

*Cryoelectron microscopy. 

^†X-ray crystallography. 

^‡One of the side-chain (S.C.) oxygens of Asp-115.