1xqe Summary

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The mechanism of ammonia transport based on the crystal structure of AmtB of E. coli.

The structure was published by Zheng, L., Kostrewa, D., Berneche, S., Winkler, F.K., and Li, X.-D., in 2004 in a paper entitled "The mechanism of ammonia transport based on the crystal structure of AmtB of Escherichia coli" (abstract).

This crystal structure was determined using X-ray diffraction at a resolution of 2.1 Å and deposited in 2004.

The experimental data on which the structure is based was also deposited.

The PDB entry contains the structure of Probable ammonium transporter. This molecule has the UniProt identifier P69681 (AMTB_ECOLI)search. The sample contained 418 residues which is 100% of the natural sequence. Out of 418 residues 366 were observed and are deposited in the PDB.

It also contains one or more heterogenic compounds (e.g., ligands, co-factors, ions, modified amino acids, etc.); see here for a complete list.

The molecule most likely forms homotrimers.

The following tables show cross-reference information to other databases (to obtain a list of all PDB entries sharing the same property or classification, click on the magnifying glass icon):


Chain Name UniProt Name of source organism % of UniProt sequence present in the sample Residues in the sample molecules % of residues observed
A Probable ammonium transporter P69681 (23-428) (AMTB_ECOLI)search Escherichia coli K-12search 95% 418 87%


This entry contains 1 unique UniProt protein:

UniProt accession Name Organism PDB
P69681 (23 - 428) Probable ammonium transporter Escherichia coli

Chain Structural classification (SCOP) Structural classification (CATH) Sequence family (Pfam)
A (P69681) Ammonium transportersearch Ammonium transporter AmtB like domainssearch PF00909: Ammonium Transporter Familysearch

Chain ID Cellular component (GO) Biological process (GO) Molecular function (GO)
A (P69681) plasma membranesearch membranesearch integral component of membranesearch integral component of plasma membranesearch carbon dioxide transportsearch transportsearch ammonium transportsearch ammonium transmembrane transportsearch ammonium transmembrane transporter activitysearch uniporter activitysearch

Chain InterPro annotation
A Ammonium transportersearch Ammonium transporter, conserved sitesearch Ammonium transporter AmtB-like domainsearch Ammonium/urea transportersearch