Table 1 Open in new tab Properties of...

	MED4	MIT9313	Pro. core
Origin of isolation^a
Isolation site	Mediterranean	Gulf Stream	—
Isolation depth	Surface (5 m)	Deep (135 m)	—
Selected iron-related genes^a^,^b^,^c
Ferritin—iron storage	1	2	1
Flavodoxin (isiB)—iron-free electron transfer	1	1	1
Ferredoxin (petF and others)—iron-requiring electron transfer	6	7	3
idiA/afuA—putative iron ABC transporter, substrate binding protein	1	1	1
futB—putative iron ABC transporter, permease component	1	1	1
futC/sfuC—ABC transporter, ATP binding component, possibly iron transporter	1	1	1
fur—ferric uptake regulator	2	3	2
Cell physiology
Cell size (diameter)	0.5–0.7 μm^d^,^e	0.8–1.2 μm^e	—
Light adaptation^f	High light	Low light	—
Nitrogen sources utilized^g	NH₄, urea	NH₄, urea, nitrite	—
Copper tolerance^h	Higher	Lower	—

	MED4	MIT9313	Pro. core
Origin of isolation^a
Isolation site	Mediterranean	Gulf Stream	—
Isolation depth	Surface (5 m)	Deep (135 m)	—
Selected iron-related genes^a^,^b^,^c
Ferritin—iron storage	1	2	1
Flavodoxin (isiB)—iron-free electron transfer	1	1	1
Ferredoxin (petF and others)—iron-requiring electron transfer	6	7	3
idiA/afuA—putative iron ABC transporter, substrate binding protein	1	1	1
futB—putative iron ABC transporter, permease component	1	1	1
futC/sfuC—ABC transporter, ATP binding component, possibly iron transporter	1	1	1
fur—ferric uptake regulator	2	3	2
Cell physiology
Cell size (diameter)	0.5–0.7 μm^d^,^e	0.8–1.2 μm^e	—
Light adaptation^f	High light	Low light	—
Nitrogen sources utilized^g	NH₄, urea	NH₄, urea, nitrite	—
Copper tolerance^h	Higher	Lower	—

Table 1

Properties of MED4 and MIT9313 with potential relevance to iron metabolism

	MED4	MIT9313	Pro. core
Origin of isolation^a
Isolation site	Mediterranean	Gulf Stream	—
Isolation depth	Surface (5 m)	Deep (135 m)	—
Selected iron-related genes^a^,^b^,^c
Ferritin—iron storage	1	2	1
Flavodoxin (isiB)—iron-free electron transfer	1	1	1
Ferredoxin (petF and others)—iron-requiring electron transfer	6	7	3
idiA/afuA—putative iron ABC transporter, substrate binding protein	1	1	1
futB—putative iron ABC transporter, permease component	1	1	1
futC/sfuC—ABC transporter, ATP binding component, possibly iron transporter	1	1	1
fur—ferric uptake regulator	2	3	2
Cell physiology
Cell size (diameter)	0.5–0.7 μm^d^,^e	0.8–1.2 μm^e	—
Light adaptation^f	High light	Low light	—
Nitrogen sources utilized^g	NH₄, urea	NH₄, urea, nitrite	—
Copper tolerance^h	Higher	Lower	—

	MED4	MIT9313	Pro. core
Origin of isolation^a
Isolation site	Mediterranean	Gulf Stream	—
Isolation depth	Surface (5 m)	Deep (135 m)	—
Selected iron-related genes^a^,^b^,^c
Ferritin—iron storage	1	2	1
Flavodoxin (isiB)—iron-free electron transfer	1	1	1
Ferredoxin (petF and others)—iron-requiring electron transfer	6	7	3
idiA/afuA—putative iron ABC transporter, substrate binding protein	1	1	1
futB—putative iron ABC transporter, permease component	1	1	1
futC/sfuC—ABC transporter, ATP binding component, possibly iron transporter	1	1	1
fur—ferric uptake regulator	2	3	2
Cell physiology
Cell size (diameter)	0.5–0.7 μm^d^,^e	0.8–1.2 μm^e	—
Light adaptation^f	High light	Low light	—
Nitrogen sources utilized^g	NH₄, urea	NH₄, urea, nitrite	—
Copper tolerance^h	Higher	Lower	—

For each iron-related gene listed, the number of orthologs present in each genome is shown, as well as the number of orthologs present in the Prochlorococcus (Pro.) core genome (that is, genes shared by all 13 sequenced Prochlorococcus).

Rocap et al. (2003).

MicrobesOnline (http://www.microbesonline.org/) (Dehal et al., 2010).

ProPortal (http://www.proportal.mit.edu/).

Morel et al. (1993).

Ting et al. (2007).

Moore and Chisholm (1999).

Moore et al. (2002).

Mann et al. (2002).

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