Table 2.

Characteristics of SpG8 Gene Clusters

G8-Specific Regions	C58 CDSs	Region Occurrence Outside G8	Main Predicted Functions	Experimental Validationa
SpG8-1a	Atu1398–Atu1408	G6-NCCPB 925	Sugar and amino acid transport; sugar metabolism	Not done
SpG8-1b	Atu1409–Atu1423	G9-Hayward 0362	Ferulic acid uptake and catabolism	Present work
SpG8-2a	Atu3054–Atu3059	r	Curdlan EPS biosynthesis	Present work
SpG8-2b	Atu3069–Atu3073	r	Secondary metabolite biosynthesis	Not done
SpG8-3	Atu3663–Atu3691	G1-ICPPB TT111	Siderophore biosynthesis; iron-siderophore uptake	Rondon et al. (2004)
		G6-NCCPB 925
SpG8-4	Atu3808–Atu3830	G6-NCCPB 925	Ribose transport; monosaccharide catabolism and carbohydrate metabolism	Not done
SpG8-5	Atu3947–Atu3952	r	Opine-like compounds catabolism	Not done
SpG8-6a	Atu4196–Atu4206	G1-CFBP 5771	Drug/toxic (tetracycline) resistance	Luo and Farrand (1999)
SpG8-6b	Atu4213–Atu4221	r	Drug/toxic resistance	Not done
SpG8-7a	Atu4285–Atu4294	G6-NCCPB 925	Environmental signal sensing/transduction	Not done
SpG8-7b	Atu4295–Atu4307	Not present outside G8	Environmental signal sensing/transduction	Not done

NOTE.—r, rare occurrence of some CDSs outside G8.

^aDeleted mutants of C58 were obtained for all regions.