Protein
Na(+)/H(+) antiporter NhaB
Organism
Escherichia coli (strain K12)
Function
Na(+)/H(+) antiporter that extrudes sodium in exchange for external protons. Catalyzes the exchange of 3 H(+) per 2 Na(+). Has a high affinity for sodium, but can also transport lithium. Activity is weakly pH-dependent. Essential for regulation of intracellular pH under alkaline conditions.
Similarity
Belongs to the NhaB Na(+)/H(+) (TC 2.A.34) antiporter family.
Sequence
MEISWGRALWRNFLGQSPDWYKLALIIFLIVNPLIFLISPFVAGWLLVAEFIFTLAMALKCYPLLPGGLLAIEAVFIGMTSAEHVREEVAANLEVLLLLMFMVAGIYFMKQLLLFIFTRLLLSIRSKMLLSLSFCVAAAFLSAFLDALTVVAVVISVAVGFYGIYHRVASSRTEDTDLQDDSHIDKHYKVVLEQFRGFLRSLMMHAGVGTALGGVMTMVGEPQNLIIAKAAGWHFGDFFLRMSPVTVPVLICGLLTCLLVEKLRWFGYGETLPEKVREVLQQFDDQSRHQRTRQDKIRLIVQAIIGVWLVTALALHLAEVGLIGLSVIILATSLTGVTDEHAIGKAFTESLPFTALLTVFFSVVAVIIDQQLFSPIIQFVLQASEHAQLSLFYIFNGLLSSISDNVFVGTIYINEAKAAMESGAITLKQYELLAVAINTGTNLPSVATPNGQAAFLFLLTSALAPLIRLSYGRMVWMALPYTLVLTLVGLLCVEFTLAPVTEWFMQMGWIATL