Table 2. Superimposition of FlhF, Ffh and FtsY.

	FlhF	Ffh	FtsY
GDP-bound
PDB code	8r9r †	2ng1	2iyl
R.m.s.d. (Å)	N/A	2.523	3.186
Organism	Shewanella putrefaciens	Thermus aquaticus	Thermus aquaticus
GTP/GMPPNP-bound
PDB code	2px3	2j7p	2j7p
R.m.s.d. (Å)	1.355	1.920	2.566
Organism	Bacillus subtilis	Thermus aquaticus	Thermus aquaticus

^†This study.