Table 1.

A list of current experimental models of BLUF domains in the Protein Data Bank (www.rcsb.org/pdb)

Protein Data Bank entry	Protein	Resolutiona	Annotation	Group	Number of residues per model subunit
1X0P	TePixDb	2.0	Electron transport	II	143
1YRX	APPA	2.3	Novel (truncated)	I	117
2IYG	APPA	2.3	Dark state	I	108
2IYI	APPA	2.95	Light-induced intermediate	I	108
4HH0	APPA	2.6	Dark-state C20S mutant	I	385
4HH1	APPA	3.5	Wild-type dark state	I	385
2BUN	APPA	NMR		I	120
2BYC	BLRB	1.9	Dark state	I	136
3GFX	BLRP1	2.4	Hydrolase	II	400
3GFY	BLRP1	2.6	No metal ions	II	400
3GFZ	BLRP1	2.05	pH 6	II	400
3GG0	BLRP1	2.55	pH 9	II	400
3GG1	BLRP1	2.3	pH 8	II	400
2KB2	BLRP1	NMR		II	148
3MZI	SLR1694	2.3	Y8F mutant	I	139
2HFN	SLR1694	1.8		I	140
2HFO	SLR1694	2.1		I	140
4YUS	OAPAC	1.8	Dark state, full-length.	II	350

^aResolution, where appropriate, is given in Ångstrom

^bThe structure of TePixD was solved before the role of the protein in light detection was realised