Abstract
Neisseria meningitidis is a pathogenic bacterium responsible for meningitis. The mechanisms underlying the control of Na+ transmembrane movement, presumably important to pathogenicity, have been barely addressed. To elucidate the function of the components of the Na+ transport system in N. meningitidis, an open reading frame from the genome of this bacterium displaying similarity with the NhaE type of Na+/H+ antiporters was expressed in Escherichia coli and characterized for sodium transport ability. The N. meningitidis antiporter (NmNhaE) was able to complement an E. coli strain devoid of Na+/H+ antiporters (KNabc) respecting the ability to grow in the presence of NaCl and LiCl. Ion transport assays in everted vesicles prepared from KNabc expressing NmNhaE from a plasmid confirmed its ability to translocate Na+ and Li+. Here is presented the characterization of the first NhaE from a pathogen, an important contribution to the comprehension of sodium ion metabolism in this kind of microorganisms.




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Acknowledgments
We are grateful to Drs Christoph Tang and Hiroshi Kanazawa for the generous gift of N. meningitidis genomic DNA and the E. coli strain KNabc, respectively. Filipe Santos and Andreia Rodrigues are acknowledged for excellent technical assistance. AMPM was awarded a Deutcher Akademischer Austausch Dienst research visit grant and PMFS received a grant from Fundação para a Ciência e a Tecnologia (SFRH/BD/46553/2008).
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Communicated by Krämer Reinhard.
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203_2012_856_MOESM1_ESM.docx
Alignment of representative amino acid sequences from the five families of Nha Na+/H+ antiporters obtained using ClustalW. Aa, Alkalimonas amylolytica, NhaD (AAX63482.1); Bf, Bacillus firmus, NhaC (AAC45432.1); Bsp., Bacillus sp., NhaC (ABH03020.1); Dv, Desulfovibrio vulgaris, NhaE (YP_009252.1); Ec, Escherichia coli, NhaA (NP_414560.1), NhaB (AAA24218.1|); Ef, Enterococcus faecalis, NhaC (ZP_05501989.1); He, Halomonas elongata, NhaD (YP_003897392.1); Hi, Haemophilus influenzae, NhaB (ZP_05848338.1); Hp, Helicobacter pylori, NhaA (O26076.1); Kp, Klebsiella pneumoniae, NhaB (YP_002237820.1); Mc, Methylococcus capsulatus, NhaD (YP_114201.1); Mt, Moorella thermoacetica, NhaE (YP_429442.1); Nm, Neisseria meningitidis, NhaC (NP_273581.1), NhaE (NP_273614.1); Psp., Pseudomonas sp., NhaA (AAV49149.1); Rm, Rhodothermus marinus, NhaE (AAY42129.1); Vc, Vibrio cholerae, NhaA (O85187.1), NhaB (Q9KQU7.1), NhaD (AAG48354.2). (DOCX 40 kb)
203_2012_856_MOESM2_ESM.docx
Primary sequence comparison of the 50 closest hits from a GenBank search using NmNhaE as query. Amoebophilus asiaticus, Amoebophilus asiaticus (YP_001958297.1); A sp1., Algoriphagus sp. (ZP_01718340.1); A sp2., Anaeromyxobacter sp. (YP_001380997.1); A vinelandii, Azotobacter vinelandii (YP_002798245.1); B Ellin514, bacterium Ellin 514 (ZP_03629791.1);B japonicum, Bradyrhizobium japonicum (NP_773762.1); B phymatum, Burkholderia phymatum (YP_001857045.1); B sp., Burkholderia sp.(YP_368456.1); C eutactus, Coprococcus eutactus (ZP_02207858.1); C flavus, Chthoniobacter flavus(ZP_03133069.1); C testosteroni, Comamonas testosteroni (ZP_03544348.1); C limicola, Chlorobium limicola (YP_001942426.1); C phaeobacte, Chlorobium phaeobacteroides (YP_001960386.1); C tepidum, Chlorobium tepidum (NP_661198.1); D acidovorans, Delftia acidovorans (YP_001565753.1); D baculatum, Desulfomicrobium baculatum (YP_003159209.1); D hafniense, Desulfitobacterium hafniense (YP_520285.1); D sp., Diaphorobacter sp.(YP_002552833.1); D vulgaris, Desulfovibrio vulgaris (YP_009252.1); E corrodens, Eikenella corrodens (ZP_03713713.1); E hallii, Eubacterium hallii (ZP_03715974.1); H arsenic, Herminiimonas arsenicoxydans (YP_001099123.1); K oralis, Kingella oralis (ZP_04602428.1); L cholodnii, Leptothrix cholodnii(YP_001791022.1); L hongkongens, Laribacter hongkongensis (YP_002795798.1); L intracell, Lawsonia intracellularis (YP_594890.1); L nitroferrum, Lutiella nitroferrum (ZP_03697702.1 and ZP_03699435.1); J sp., Janthinobacterium sp. (YP_001352410.1); Nm, Neisseria meningitidis (NP_273614.1); M loti, Mesorhizobium loti (NP_105654.1); M petroleiph, Methylibium petroleiphilum (YP_001020707.1); M silvestris, Methylocella silvestris (YP_002362098.1); M thermoacetica, Moorella thermoacetica (YP_429442.1); O carboxido, Oligotropha carboxidovorans (YP_002290536.1); P aestuarii, Prosthecochloris aestuarii (YP_002016448.1); P phaeoc, Pelodictyon phaeoclathratiforme (YP_002017089.1); P naphthalen, Polaromonas naphthalenivorans (YP_981856.1); T intermédia, Thiomonas intermédia (ZP_05500427.1); R centenum, Rhodospirillum centenum (YP_002297310.1); R eutropha, Ralstonia eutropha (YP_727038.1); R intestinalis, Roseburia intestinalis (ZP_04745272.1); R marinus, Rhodothermus marinus, (AAY42129.1); R palustris, Rhodopseudomonas palustris (ZP_06360325.1); R sp., Ruminococcus sp. (ZP_04857516.1); S fumaroxidan, Syntrophobacter fumaroxidans (YP_845285.1); V eiseniae, Verminephrobacter eiseniae (YP_996836.1); V paradoxus, Variovorax paradoxus (YP_002943689.1); V spinosum, Verrucomicrobium spinosum (ZP_02926838.1); X autotrophi, Xanthobacter autotrophicus (YP_001416350.1). (DOCX 97 kb)
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Sousa, P.M.F., Videira, M.A.M., Vorburger, T. et al. The novel NhaE-type Na+/H+ antiporter of the pathogenic bacterium Neisseria meningitidis . Arch Microbiol 195, 211–217 (2013). https://doi.org/10.1007/s00203-012-0856-4
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DOI: https://doi.org/10.1007/s00203-012-0856-4