Table 3.

Summary data of six principal structural models of conformational states of LacY and XylE used in this study.

PDB ID	Protein	Conformation	Resolution*
4OAA	LacY	Outward occluded	3.50
2Y5Y	LacY	Inward, affinity inactivator-occluded	3.38
2V8N	LacY	Inward open	3.60
4GBY	XylE	Outward occluded	2.81
4JA3	XylE	Inward occluded	3.80
4JA4	XylE	Inward open	4.20

^*) The magnitude of the TMS11 movement differs in panels b and d of Figure 1, being on the order of 4 Å for LacY, and 6 to 8 Å for XylE. The resolution limits are better on average for LacY, never reaching the 4 Å threshold, whereas for XylE in the inward open state, the resolution is only 4.2 Å.