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Table 3 Presence and copy number of iron-regulated genes in the genomes of ecologically distinct diatoms

From: Genome and low-iron response of an oceanic diatom adapted to chronic iron limitation

Gene Product Destination Mutual substitution at low-iron Putative role in iron uptake To Tp Pt Fc
PETF Ferredoxin CP Ferredoxin → flavodoxin (short)   1 1 1 1
FLDA(s) Flavodoxin (short) CP Ferredoxin → flavodoxin (short)   2 0 1 1
FLDA(l) Flavodoxin (long) SP (ER?) None (distinct functional context)   1 1 1 1
CYTC6 (type A) Cytochrome c6 CP Cytochrome c6 (type A) → plastocyanin   2 1 1 1
CYTC6 (type B) Cytochrome c (?) SP (ER?) None (distinct functional context)   1 1 1 0
PETE/PCY Plastocyanin CP Cytochrome c6 (type A) → plastocyanin   1 0 0 1
Class II FBA (type A) Class II fructose-bisphosphate aldolase CP pyrenoid (Pt FBAC1) Class II FBA (type A) → class I FBA (type A)   1 1 1 1
Class II FBA (type B) Class II fructose-bisphosphate aldolase CP stroma (Pt FBAC2) Class II FBA (type B) → class I FBA (type B)   1 1 1 1
Class II FBA (type C) Class II fructose-bisphosphate aldolase Cytosolic (Pt FBA3) Class II FBA (type C) → class I FBA (type C)   1 1 1 1
Class I FBA (type A) Class I fructose-bisphosphate aldolase CP pyrenoid (Pt FBAC5) Class II FBA (type A) → class I FBA (type A)   1 0 1 1
Class I FBA (type B) Class I fructose-bisphosphate aldolase CP stroma Class II FBA (type B) → class I FBA (type B)   1 0 0 1
Class I FBA (type C) Class I fructose-bisphosphate aldolase Cytosolic (Pt FBA4) Class II FBA (type C) → class I FBA (type C)   1 1 1 1
ISIP1 Iron starvation induced protein 1 Cell surface   Receptor (?) 2 0 1 3
ISIP3 Iron starvation induced protein 3 Cell surface   Co-receptor (?) 1 1 1 2
  1. The coastal diatom species T. pseudonana (Tp) lacks several genes that are found in the genomes of diatoms with high tolerance to low-iron conditions (T. oceanica (To), P. tricornutum (Pt), F. cylindrus (Fc)). Listed are also the respective counterparts whose products are subject to substitution under iron-limited conditions. The conserved paralogous genes of FLDA and CYTC6 are predicted to contain a signal peptide and are assumed to act in a different functional context. CP chloroplast; ER endoplasmic reticulum; SP, secretory pathway.