Ontology highlight
ABSTRACT:
SUBMITTER: Hall JA
PROVIDER: S-EPMC3656265 | biostudies-literature | 2013 May
REPOSITORIES: biostudies-literature
The Journal of biological chemistry 20130401 20
Members of the Amt family of channels mediate the transport of ammonium. The form of ammonium, NH3 or NH4(+), carried by these proteins remains controversial, and the mechanism by which they select against K(+) ions is unclear. We describe here a set of Escherichia coli AmtB proteins carrying mutations at the conserved twin-histidine site within the conduction pore that have altered substrate specificity and now transport K(+). Subsequent work established that AmtB-mediated K(+) uptake occurred ...[more]