TABLE 1.

Amino acid sequence identity of subunits of cyanobacterial cytochrome b₆f complex compared to b₆f complex from M. laminosus

The subclass of cyanobacteria strain is specified in parentheses, according to Ref. 10. M. laminosus belongs to subclass V. Group IV strains, including Nostoc, which is the subject of the present study, are written in boldface.

Strain	cyt f	cyt b6	ISP	SuIV	petG	petL	petM	petN
Acaryochloris marina MBIC 11017 (I)	60	88	70	75	66	50	13	65
Gloeobacter violaceus PCC 7421 (I)	45	83	48	70	54	n.i.a	42b	57
Prochlorococcus marinus MIT 9301 (I)	59	83	64	79	56	n.i.	40	62
Synechococcus elongatus PCC 6301 (I)	67	88	77	79	60	30	42	68
Synechococcus sp. PCC 7002 (I)	68	86	70	73	76	n.i.	25	n.i.
Synechocystis sp. PCC 6803 (I)	68	84	75	76	62	34	25	72
Thermosynechococcus elengatus BP-1 (I)	69	88	70	81	64	30	39	65
Trichodesmium erythraeum IMS 101 (III)	71	85	73	83	72	21b	51b	68b
Anabaena variabilisATCC 29413 (IV)	83	95	85	91	81	74	79	86
Nostocsp. PCC 7120 (IV)	83	95	84	91	81	74b	79	86

^an.i., the gene has not been identified in a BLAST search of genomic DNA sequences of homologous cyanobacterial proteins.

^bThe gene has been identified by BLAST search of genomic DNA using sequences of homologous cyanobacterial proteins.