Table III. Mapping of NnrU/Z-ISO homolog in cyanobacterial genomes.

This table is modified from Maresca et al. (2008). Five Prochlorococcus species strains are condensed to one row because they are identical in enzyme distribution. These include P. marinus MIT 9211, P. marinus MIT 9312, P. marinus NATL2A, P. marinus marinus CCMP1375, and P. marinus pastoris CCMP1986. To map Z-ISO/NnrU homologs, we searched for the NnrU-like gene using the SEED viewer, where sequenced bacterial and plant genomes have been compiled (http://theseed.uchicago.edu/FIG/index.cgi). The cluster analysis was done for available genomes for which the physical organization was available . +, Enzyme present; −, enzyme absent. Homologs of plant genes are as follows: CrtH(CrtISO), CrtP(PDS), CrtQ(ZDS). CrtI is the bacterial-type 4 step desaturase not found in plants.

Cyanobacterial Species	CrtH	CrtI	CrtP	CrtQ	NnrU	NnrU Located Near Oxidoreductases	NnrU Located Near Carotenoid Genes
Anabaenavariabilis ATCC 29413	+	−	+	+	+	+	−
Crocosphaera watsonii WH 8501	+	−	+	+	+	−	−
Gloeobacter violaceus PCC 7421	−	+	−	−	−	−	−
Nostoc punctiforme PCC 73102	+	−	+	+	+	+	−
Nostoc species PCC 7120	+	−	+	+	+	+	−
Prochlorococcus species (5)	+	−	+	+	+	+	+
Synechococcus elongatus PCC 6301	+	−	+	+	+	+	+
Synechococcus elongatus PCC 7942	+	−	+	+	+	+	+
Synechococcus species CC9311	+	−	+	+	+	+	+
Synechococcus species CC9605	+	−	+	+	+	+	+
Synechococcus species CC9902	+	−	+	+	+	+	+
Synechococcus species RS9917	+	−	+	+	+	+	+
Synechococcus species WH 5701	+	−	+	+	+	+	+
Synechococcus species WH 7805	+	−	+	+	+	+	+
Synechococcus species WH 8102	+	−	+	+	+	+	+
Synechocystis species PCC 6803	+	−	+	+	+	−	−
Thermosynechococcus elongatus BP-1	−	−	+	+	−	−	−
Trichodesmium erythraeum IMS101	+	−	+	+	+	+	−