The Orange Carotenoid Protein of Cyanobacteria - Carotenoids: Physical, Chemical, and Biological Functions and Properties - page 5

TABLE 1.1
Occurrence of the OCP, Its Paralogs, and Co-Occurring Conserved Hypothetical Protein

Organism slr 1964 OCP OCP N-ter OCP C-ter

Synechococcus CC9902 syncc9902_0971 syncc9902_0973

Crocosphaera watsonii
WH 8501

CWATdraft_0985 CWATdraft_5349

Lyngbya sp PCC8106 L8106_29205 L8106_29210 L8106_0668

L8106_29395

L8106_29390

L8106_04666

Synechococcus sp BL107 BL107_14115 BL107_14105

Synechococcus sp WH7805 WH7805_01192 WH7805_01202

Nostoc sp PCC7120 All3148 All3149 All1123 All4940

Alr4783
All4941
All3221

Synechococcus WH7803 synwh7803_0927 synwh7803_0929

Synechococcus WH5701 WH5701_04000 WH5701_04010

WH5701_00210
(219 a a)

Synechococcus WH8102 SYNW1369 SYNW1367

Anabaena varaibilis Ava_3842 Ava_3843 Ava_2052 Ava_2231

ATCC29413 Ava_2230

Ava_4694

Synechococcus CC9311 Sync_1805 Sync_1803

Synechococcus RS9917 RS9917_00682 RS9917_00692

Cyanothece CCY0110 CY0110_09682 CY0110_09677 CY0110_08696 CY0110_8806

Synechococcus RCC307 SynRCC307_1994 RCC307_1992

Nostoc punctiforme NpR5144 NpF5133

PCC73102 NpR0404 a NpF6242 a

NpF5913 a
NpR5130
NpF6243

Nodularia spumigena N9414_13085 N9414_12098 N9414_22253

CCY9414 N9414_22258

Gloeobacter violaceus glr0050 gll0259 gll2503

PCC7421 glr3935 (274) gll0260 (217)

Thermosynechococcus
elongates BP-1

tll1269 tll1268

Acaroychloris marina AMI_5842

a Known to be expressed by proteomic analysis.

Rakhimberdieva (Rakhimberdieva et al. 2004) showed that the action spectrum for the
phycobilisome l uorescence quenching resembled the absorption spectrum of cyanobacterial
carotenoids. Subsequently, it was demonstrated that the blue-light responsive carotenoid was
associated with a protein that had been structurally characterized, but of unknown function—
the OCP (Wilson et al. 2006). In the absence of the OCP, the NPQ induced by strong white or
blue-green light in Synechocystis PCC6803 cells was completely inhibited and, as a consequence,
the cells were more sensitive to light stress. Moreover, the action spectrum of the cyanobacterial