Table 3.

Transformability and putative competence genes in five S. mitis strains.

	Genes	S. mitis strainsa
		CCUG31611T	SK321	SK575	SK579	SK616
Transformability		+	+	-	-	-
Early genes	comAB	+	+	+	+	+
	comCDE	+	+	+	+	+
	sigX1	+	+	∗	∗∗	∗∗
	sigX2	+	+	-	∗∗	-
Core SigX regulon	Recombination
	radA	+	+	+	+	+
	coiA	+	+	+	+	+
	dprA	+	+	+	+	+
	ssbB	+	+	+	+	+
	recA	+	+	+	+	+
	comFA-comFC	+	+	+	+	+
	cilC	+	+	+	+	+
	comEA-comEC	+	+	+	+	+
	comGA-comGG	+	+	+	+	+
	Fratricide
	cbpD	+	+	+	+	+
	Unknown functions
	dut	+	+	+	+	+
	rmuC, ccs50	+	+	+	+	+
	yhaM, cbf1	+	+	+	+	+
	yfiA	+	+	+	+	+
	pepF	+	+	+	+	+
	pilC	+	+	+	+	+
	radC	+	+	+	+	+
	cinA	+	+	+	+	+

^aGenome data used for the identification of competence genes: NCTC12261 (CCUG 31611), accession AEDX00000000; SK321, accession AEDT00000000; SK575, accession AICU00000000; SK579, accession AJJL00000000; SK616, accession AICR00000000. ^∗Substitution of two conserved N-terminal aminoacid residues (E4K; L5M). ^∗∗Lack of the 5 to 8 C-terminal aminoacid residues possibly essential for proper function of σ^X. +Present, – Absent.