Table 2. Binding site matches to proteins of known structure in the SubI family. PDB Binding site Database annotation structure match (ligand) 1ixh (phosphate) 2547078 phosphate PBP (Enterobacter cloacae) 2984256 phosphate PBP (A. aeolicus) 2129188 phosphate PBP (Methanococcus jannaschii) PSTS_HAEIN phosphate PBP 1001197 phosphate PBP (Synechocystis sp.) 1652919 phosphate PBP (Synechocystis sp.) 2182813 phosphate PBP (Prochlorococcus marinus) 541315 phosphate PBP (Synechococcus sp.) 4753672 Putative PstS protein (Burkholderia sp.) 5103433 hypothetical phosphate PBP (Aeropyrum pernix) 699314 phosphate-repressible PBP homologue (Mycobacterium leprae) 3261751 phosphate binding lipoprotein (Mycobacterium tuberculosis) 1076042 PstS-3 protein precursor (M. tuberculosis) 2078051 phosphate PBP (M. tuberculosis) 1183926 phosphate PBP (Mycobacterium intracellulare) 699229 match to phosphate PBP (M. leprae) YQGG_BACSU probable ABC transporter binding protein 2622859 phosphate-binding protein PstS homologue (Methanobacterium thermoautotrophicum) 2622858 phosphate PBP (M. thermoautotrophicum) 4981819 phosphate PBP (Thermotoga maritima) 1mrp (ferric iron) 2340838 ferric iron PBP (Actinobacillus actinomycetemcomitans) 1498595 periplasmic iron repressible protein (A. actinomycetemcomitans) FBP_NEIGO ferric iron PBP FBP_NEIME ferric iron PBP SFUA_SERMA iron(III) PBP 619573 probable iron PBP (Yersinia enterocolitica) 4514347 hypothetical protein (Bacillus halodurans) 1pot (polyamine) POT1_HAEIN spermidine/putrescine PBP 1142681 lipoprotein (Pasteurella haemolytica) 3341857 spermidine/putrescine PBP (A. actinomycetemcomitans) POT2_HAEIN spermidine/putrescine PBP 5104614 hypothetical spermidine/putrescine PBP (A. pernix) 3322956 spermidine/putrescine PBP (Treponema pallidum) 1sbp (sulfate) SUBI_ECOLI sulfate PBP 4323056 putative sulfur-binding protein (Enterobacter cloacae) SUBI_SYNY3 sulfate PBP SUBI_SYNP7 sulfate PBP 2127463 sulfate PBP (M. leprae) 1655660 sulfate PBP (M. tuberculosis) 1wod (tungstate/ MODA_HAEIN molybdate PBP molybdate) 2635851 similar to molybdate-binding protein (Bacillus subtilis) 3955198 molybdate PBP (Staphylococcus carnosus) 5019354 putative substrate-binding periplasmic transport protein (S. coelicolor) 1006621 molybdate PBP (Synechocystis sp.) 1781190 molybdate PBP (M. tuberculosis) 2288879 molybdate PBP (Arthrobacter nicotinovorans) 2650554 hypothetical protein (Archaeoglobus fulgidus) 2128717 hypothetical protein (Methanococcus jannaschii) 3256537 hypothetical protein (Pyrococcus horikoshii) 1atg (tungstate/ 2983953 molybdate PBP (Aquifex aeolicus) molybdate)