Table 1. Nineteen genes form the specific phylogroup A MPEC core genome.

Gene in MG1655	Gene name	Product	% in MPEC	% in phy A	cluster
b1028	ymdE	undefined product	98.5	79.9	1
b1029	ycdU	putative inner membrane protein	98.5	82.0	1
b1384	feaR	transcriptional activator for tynA and feaB	100	82.1	2
b1385	feaB	phenylacetaldehyde dehydrogenase	100	82.2	2
b1393	paaF	2,3-dehydroadipyl-CoA hydratase	100	79.2	2
b1394	paaG	1,2-epoxyphenylacetyl-CoA isomerase, oxepin-CoA-forming	100	76.7	2
b1395	paaH	3-hydroxyadipyl-CoA dehydrogenase, NAD + -dependent	98.5	76.0	2
b1396	paaI	hydroxyphenylacetyl-CoA thioesterase	98.5	76.6	2
b1397	paaJ	3-oxoadipyl-CoA/3-oxo-5,6-dehydrosuberyl-CoA thiolase	98.5	76.6	2
b1398	paaK	phenylacetyl-CoA ligase	98.5	76.7	2
b1399	paaX	transcriptional repressor of phenylacetic acid degradation paa operon, phenylacetyl-CoA inducer	100	79.2	2
b1400	paaY	thioesterase required for phenylacetic acid degradation; trimeric; phenylacetate regulatory and detoxification protein; hexapeptide repeat protein	100	80.5	2
b4287	fecE	ferric citrate ABC transporter ATPase	98.5	66.6	3
b4288	fecD	ferric citrate ABC transporter permease	100	67.9	3
b4289	fecC	ferric citrate ABC transporter permease	100	67.9	3
b4290	fecB	ferric citrate ABC transporter periplasmic binding protein	100	68.1	3
b4291	fecA	TonB-dependent outer membrane ferric citrate transporter and signal transducer; ferric citrate extracelluar receptor; FecR-interacting protein	100	68.1	3
b4292	fecR	anti-sigma transmembrane signal transducer for ferric citrate transport; periplasmic FecA-bound ferric citrate sensor and cytoplasmic FecI ECF sigma factor activator	100	68.1	3
b4293	fecI	RNA polymerase sigma-19 factor, fec operon-specific; ECF sigma factor	100	68.1	3

These genes cluster into three loci, including two adjacent genes ymdE and ycdU, ten genes from the phenylacetic acid degradation operon (feaR, feaB, paaFGHIJKXY) and the seven genes of the ferric citrate uptake system (fecIRABCDE).