Table 1.

Occurrences of IVSs, HEGs and intergenic sequences in the nrdJEF operon in the B. cereus group

Strains	ssp.	nrdE IVS	1G1	nrdF IVS	References
B. an ssp.	Ames	1VS3 + (I-BanI)2	Al	–	4
	Sterne	1VS3 + 1-Banl2	Al	–	5
B. ce ssp.	AH187	1VS4	B	1VS6	6, 7
	AH820	lVS3+ (I-BanI)2	Al	–	8
	ATCC 10987	1VS4	B	–	9
	ATCC 11778	–	A2	–	6
	ATCC 14579	–	A2	–	10
	cytotoxis	1VS2	A4	–	11
	E33L	1VS4	A2	–	12
	G9241	1VS4	A2	–	13
B. th ssp.	aizawai	–	B	IVS6	6
	alesti	–	A2	–	6
	Al Hakam	IVS5 + HEG2	Al	–	6,14
	canadensis	IVS3	A2	–	6
	colmeri	–	B	1VS6	6
	dakota	–	A2	–	6
	darmstadiensis	–	A2	–	6
	dendrolimus	–	A2	–	6
	entomocidus	–	A2	–	6
	finitimus	1VS4	Al	–	6
	galechiae	–	A2	–	6
	galleriae	–	B	IVS6	6
	indiana	–	B	IVS6	6
	israeliensis3	–	A2	–	15
	konkukian	IVS3	Al	–	16
	kurstaki	–	B	IVS6	6
	morrisoni	–	B	IVS6	6
	ostrinae	–	A2	–	6
	pakistani	1VS3 + (1-BanI)2	B	1VS6 +1-Bthll2	6
	sotto	–	A2	–	6
	subtoxicus	–	A2	–	6
	thompsoni	–	B	1VS6	6
	thuringiensis	–	A2	–	6
	tochigiensis	1VS4	A2	–	6
	tohokuensis	–	B	1VS6 +(1-BthII)2	6
	tolworthii	–	B	1VS6	6
	toumanoffii	–	A2	–	6
	wuhanensis	–	B	1VS6	6
B. wei ssp.	KBAB4	1VS2	A3	–	17

¹Sequence lengths of IG-groups: A1 93 bp, A2: 81 bp, A3: 94 bp, A4: 152 bp, B: 154 bp.

²ORF found in respective intron, I-BanI and I-BthII indicate HEGs that have been tested for and show activity (Nord,D., Torrents,E. and Sjöberg,B.-M. A functional homing endonuclease in the Bacillus anthracis nrdE group I intron. J. Bacteriol. (2007) 189, 5293–5301, and this study), parenthesis indicate over 99% identity with I-BanI and I-BthII, respectively and HEG denotes no identified relative or activity tested.

³Sequence of nrdIEF1 operon, nrdE2 does not cluster close to B. cereus. group nrdE genes (Nord,D., Torrents,E. and Sjöberg,B.-M. A functional homing endonuclease in the Bacillus anthracis nrdE group I intron. J. Bacteriol. (2007) 189, 5293–5301).

⁴Acc no.: NC_003997 ⁵Acc no.: NC_005945 ⁶This study. ⁷Acc no.: NZ_AAUF01000007 ⁸Acc no.: NZ_AAUE01000001 ⁹Acc no.: NC_003909 ¹⁰Acc no.: NC_004722 ¹¹Acc no.: NZ_AALL01000009 ¹²Acc no.: NC_006274 ¹³Acc no.: NZ_AAEK01000009 ¹⁴Acc no.: NC_008600 ¹⁵Acc no.: NZ_AAJM01000029 ¹⁶Acc no.: NC_005957 ¹⁷Acc no.: NZ_AAOY01000003.