nitrate/nitrite transporter NrtS
NrtS family proteins were first identified and characterized in Synechococcus sp. PCC 7002. The homologous proteins NrtS1 and NrtS2 are encoded by two neighboring genes on Synechococcus sp. PCC 7002 genome. The heteromeric transporter was shown to transport nitrite as well as nitrate. This HMM hits both NrtS1 and NrtS2 proteins, which have extremely high sequence identity and conserved motifs.