U.S. flag

An official website of the United States government

Format

Send to:

Choose Destination

amtB ammonium transporter [ Escherichia coli str. K-12 substr. MG1655 ]

Gene ID: 945084, updated on 10-Oct-2024

Summary

Go to the top of the page Help
Official Symbol
amtB
Official Full Name
ammonium transporter
Primary source
ECOCYC:EG11821
Locus tag
b0451
See related
ASAP:ABE-0001564
Gene type
protein coding
RefSeq status
PROVISIONAL
Organism
Escherichia coli str. K-12 substr. MG1655 (strain: K-12, substrain: MG1655)
Lineage
Bacteria; Pseudomonadota; Gammaproteobacteria; Enterobacterales; Enterobacteriaceae; Escherichia
Also known as
ECK0445; ybaG
Summary
AmtB is a trimeric inner membrane protein. [More information is available at EcoGene: EG11821]. AmtB, a member of the Amt family of ammonium/ammonia transporters, is responsible for the bidirectional diffusion of ammonium across the membrane and is necessary for growth only at low ammonium concentrations. [More information is available at EcoCyc: EG11821].
NEW
Try the new Gene table
Try the new Transcript table

Genomic context

Go to the top of the page Help
Sequence:
NC_000913.3 (472966..474252)

NC_000913.3Genomic Context describing neighboring genes Neighboring gene ABC transporter family protein MdlA Neighboring gene ABC transporter family protein MdlB Neighboring gene nitrogen regulatory protein PII-2 Neighboring gene acyl-CoA thioesterase II Neighboring gene PF09619 family lipoprotein YbaY

Genomic regions, transcripts, and products

Go to the top of the page Help
Genomic Sequence:
NC_000913.3

Go to nucleotide: Graphics FASTA GenBank

Bibliography

Go to the top of the pageHelp

Related articles in PubMed

  1. Molecular determinants for binding of ammonium ion in the ammonia transporter AmtB-A quantum chemical analysis. Liu Y, et al. J Phys Chem A, 2006 Feb 2. PMID 16435797
  2. The Amt/MEP/Rh family: structure of AmtB and the mechanism of ammonia gas conduction. Khademi S, et al. Physiology (Bethesda), 2006 Dec. PMID 17119155
  3. Detailed mechanism for AmtB conducting NH4+/NH3: molecular dynamics simulations. Yang H, et al. Biophys J, 2007 Feb 1. PMID 17098799, Free PMC Article
  4. Ammonium recruitment and ammonia transport by E. coli ammonia channel AmtB. Nygaard TP, et al. Biophys J, 2006 Dec 15. PMID 17012311, Free PMC Article
  5. Computational study of the binding affinity and selectivity of the bacterial ammonium transporter AmtB. Luzhkov VB, et al. Biochemistry, 2006 Sep 12. PMID 16953566

See all (67) citations in PubMed

GeneRIFs: Gene References Into Functions

What's a GeneRIF?
  1. simulations reveal previously undiscovered POPG binding sites on the intracellular side of the lipid bilayer between the AmtB subunits.
    Title: The lipid environment determines the activity of the Escherichia coli ammonium transporter AmtB.
  2. Amt and Rh proteins are not functionally equivalent and that permeation takes place according to two distinct mechanisms.
    Title: Different hydration patterns in the pores of AmtB and RhCG could determine their transport mechanisms.
  3. the twin-histidine element serves as a filter to prevent K(+) conduction in Escherichia coli ammonium channel AmtB
    Title: The molecular basis of K+ exclusion by the Escherichia coli ammonium channel AmtB.
  4. Data explore the similarity and difference of the conduction mechanism of methylamine and ammonia molecules through AmtB, using molecular dynamics simulations.
    Title: Molecular dynamics simulations on the mechanism of transporting methylamine and ammonia by ammonium transporter AmtB.
  5. AmtB activity absolutely requires F215 but not F107
    Title: Substrate binding, deprotonation, and selectivity at the periplasmic entrance of the Escherichia coli ammonia channel AmtB.
  6. AmtB allows accumulation of CH(3)NH(3)(+) ion in response to the electrical potential across the membrane
    Title: The W148L substitution in the Escherichia coli ammonium channel AmtB increases flux and indicates that the substrate is an ion.
  7. N-terminus verified by Edman degradation on mature peptide
    Title: The ammonia channel protein AmtB from Escherichia coli is a polytopic membrane protein with a cleavable signal peptide.
  8. The GlnK protein binding causes a significant downshift in the Am6 pK(a) value of the AmtB. However, this downshift is perfectly compensated by the reorientation of the protein backbone upon AmtB-GlnK complex formation.
    Title: Modulation of the protein environment in the hydrophilic pore of the ammonia transporter protein AmtB upon GlnK protein binding.
  9. Co-purification of AmtB with GlnK from ammonium-shocked E. coli cells definitvely demonstrates that these two proteins form a functional complex with a stoichiometry of 1:1.
    Title: In vitro analysis of the Escherichia coli AmtB-GlnK complex reveals a stoichiometric interaction and sensitivity to ATP and 2-oxoglutarate.
  10. simulations showed that the entrance of NH(4)(+) into the periplasmic recruitment vestibule requires only 3.1 kcal/mol of energy
    Title: Molecular dynamics simulations on the Escherichia coli ammonia channel protein AmtB: mechanism of ammonia/ammonium transport.
Submit: New GeneRIF Correction See all GeneRIFs (16)

Interactions

Go to the top of the page Help
Products Interactant Other Gene Complex Source Pubs Description

General gene information

Go to the top of the page Help

Homology

Gene Ontology Provided by EcoCyc

Function Evidence Code Pubs
enables ammonium channel activity IBA
Inferred from Biological aspect of Ancestor
more info
  
enables ammonium channel activity IDA
Inferred from Direct Assay
more info
 PubMed 
enables ammonium channel activity IEA
Inferred from Electronic Annotation
more info
  
enables identical protein binding IPI
Inferred from Physical Interaction
more info
 PubMed 
enables protein binding IPI
Inferred from Physical Interaction
more info
 PubMed 
Process Evidence Code Pubs
involved_in ammonium transmembrane transport IBA
Inferred from Biological aspect of Ancestor
more info
  
involved_in ammonium transmembrane transport IDA
Inferred from Direct Assay
more info
 PubMed 
involved_in ammonium transmembrane transport IEA
Inferred from Electronic Annotation
more info
  
involved_in carbon dioxide transport IDA
Inferred from Direct Assay
more info
 PubMed 
Component Evidence Code Pubs
located_in membrane IEA
Inferred from Electronic Annotation
more info
  
is_active_in plasma membrane IBA
Inferred from Biological aspect of Ancestor
more info
  
located_in plasma membrane IEA
Inferred from Electronic Annotation
more info
  

General protein information

Go to the top of the page Help
Preferred Names
ammonium transporter

NCBI Reference Sequences (RefSeq)

Go to the top of the page Help

NEW Try the new Transcript table

Genome Annotation

The following sections contain reference sequences that belong to a specific genome build. Explain

Reference assembly

Genomic

  1. NC_000913.3 Reference assembly

    Range
    472966..474252
    Download
    GenBank, FASTA, Sequence Viewer (Graphics)

mRNA and Protein(s)

  1. NP_414985.1 ammonium transporter [Escherichia coli str. K-12 substr. MG1655]

    See identical proteins and their annotated locations for NP_414985.1

    Status: PROVISIONAL

    UniProtKB/TrEMBL
    A0AAQ2LTE2
    Conserved Domains (1) summary
    PRK10666
    Location:1 → 428
    PRK10666; ammonium transporter AmtB
Nucleotide Protein
Heading Accession and Version

Gene LinkOut

The following LinkOut resources are supplied by external providers. These providers are responsible for maintaining the links.