Mechanism of Ammonia Transport by Amt/MEP/Rh: Structure of AmtB at 1.35 Å

By S. Khademi, J. O’Connell, J. Remis, Yaneth Robles-Colmenares, L. Miercke, R. Stroud. Science, 2004

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Inorganic Nitrogen Uptake and Transport in Beneficial Plant Root-Microbe Interactions (2015, background): “Ammonium transport through membrane pores also appears to be similar across plants, fungi and bacteria (Khademi et al., 2004): NH4+ is bound with high affinity to the pore, then transfers a proton to a pore-lining histidine residue.”
Pathways of nitrogen utilization by soil microorganisms - a review. (2010, background): “Some recent studies, however, suggested that these proteins may serve as passive NH3 channels (Khademi et al., 2004; Zheng et al., 2004).”
Plant nitrogen assimilation and use efficiency. (2012, background): “AMT1 is a plasma membrane (PM) ammonium transporter functioning either as an ammonia channel or as an ammonium uniporter or symporter with H+ (70, 118), NRT1 and NRT2 family members are mostly PM-located proton nitrate symporters (30, 44), and CLCa is a nitrate proton antiporter on the tonoplast for”