Table 3.

Photochromic photoreceptors.

Class	Subclass/Family	Representative/Paradigma	Cofactor	Activation λmax (nm)	Deactivation λmax (nm)	References
Rhodopsin	Type-I (microbial)	CrHKR1	All-trans↔13-cis retinal	380	400	Luck et al., 2012
		CrChR2 C128A	All-trans↔13-cis retinal	470	530	Berndt et al., 2009
	Type-II (animal)	MmMelanopsin	11-cis↔all-trans retinal	465	475	Freedman et al., 1999
		LjParapinopsin	11-cis↔all-trans retinal	370	515	Koyanagi et al., 2004
Phytochrome	Plant	AtPhyB	PΦB orPCB	650–670	700–730	Rockwell et al., 2006; Rockwell and Lagarias, 2010
	Bacterial and fungal	DrBphP	BV	700	750	Hughes et al., 1997; Rockwell et al., 2006; Rockwell and Lagarias, 2010
	Cyanobacterial	SyCph1	PCB	660	705	Rockwell et al., 2006; Rockwell and Lagarias, 2010
	Algal	DtPhy1	PCB	595	725	Rockwell et al., 2014
		CpGPS1	PCB	440	635	Rockwell et al., 2014
		EsPHL1	PϕB	690	565	Rockwell et al., 2014
Cyanobacteriochrome	Green/red CBCRs	SyCcaS	PCB	535	670	Hirose et al., 2008
	Red/green CBCRs	AnPixJ AmAM1_1557	PCB PCB (or BV)	650 650 (700)	545 545 (620)	Ikeuchi and Ishizuka, 2008; Rockwell and Lagarias, 2010; Narikawa et al., 2015
	DXCF CBCRs	TePixJ NpF4973	PCB→PVB PCB	430 435	530 600	Ikeuchi and Ishizuka, 2008; Rockwell and Lagarias, 2010
	Insert-Cys CBCRs	NpF2164	PCB→PVB	400	590	Ikeuchi and Ishizuka, 2008; Rockwell and Lagarias, 2010
	Novel dual-Cys CBCR	AmAM1_1186	PCB	640	415	Ikeuchi and Ishizuka, 2008; Rockwell and Lagarias, 2010
Other	LOV	BsYtvA	FMN	450	355	Losi et al., 2013
	Cryptochrome	CrCry	FAD	450	635	Beel et al., 2012
	Dronpa	PeDronpa	–	400	500	Zhou et al., 2012

^aSpecies abbreviations cf. Tables 1, 2 and as follows: Am, Acaryochloris marina; An, Anabaena sp.; Cp, Cyanophora paradoxa; Cr, Chlamydomonas reinhardtii; Dt, Dolichomastix tenuilepis; Es, Ectocarpus siliculosus; Lj, Lethenteron japonica; Np, Nostoc punctiforme; Te, Thermosynechococcus elongates.