2NUU

Regulating the Escherichia coli ammonia channel: the crystal structure of the AmtB-GlnK complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.175 

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Literature

The crystal structure of the Escherichia coli AmtB-GlnK complex reveals how GlnK regulates the ammonia channel

Conroy, M.J.Durand, A.Lupo, D.Li, X.-D.Bullough, P.A.Winkler, F.K.Merrick, M.

(2007) Proc Natl Acad Sci U S A 104: 1213-1218

  • DOI: 10.1073/pnas.0610348104
  • Primary Citation of Related Structures:  
    2NUU

  • PubMed Abstract: 
  • Amt proteins are ubiquitous channels for the conduction of ammonia in archaea, eubacteria, fungi, and plants. In Escherichia coli, previous studies have indicated that binding of the PII signal transduction protein GlnK to the ammonia channel AmtB regulates the channel thereby controlling ammonium influx in response to the intracellular nitrogen status ...

    Amt proteins are ubiquitous channels for the conduction of ammonia in archaea, eubacteria, fungi, and plants. In Escherichia coli, previous studies have indicated that binding of the PII signal transduction protein GlnK to the ammonia channel AmtB regulates the channel thereby controlling ammonium influx in response to the intracellular nitrogen status. Here, we describe the crystal structure of the complex between AmtB and GlnK at a resolution of 2.5 A. This structure of PII in a complex with one of its targets reveals physiologically relevant conformations of both AmtB and GlnK. GlnK interacts with AmtB almost exclusively via a long surface loop containing Y51 (T-loop), the tip of which inserts deeply into the cytoplasmic pore exit, blocking ammonia conduction. Y51 of GlnK is also buried in the pore exit, explaining why uridylylation of this residue prevents complex formation.


    Organizational Affiliation

    Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, United Kingdom.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Ammonia channelA, B, C, D, E, F415Escherichia coliMutation(s): 0 
Gene Names: amtB
Membrane Entity: Yes 
UniProt
Find proteins for P69681 (Escherichia coli (strain K12))
Explore P69681 
Go to UniProtKB:  P69681
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Nitrogen regulatory protein P-II 2G, H, I, J, K, L112Escherichia coliMutation(s): 0 
Gene Names: glnK
Membrane Entity: Yes 
UniProt
Find proteins for P0AC55 (Escherichia coli (strain K12))
Explore P0AC55 
Go to UniProtKB:  P0AC55
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.175 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 99.691α = 90
b = 107.865β = 90
c = 280.162γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MAR345data collection
XDSdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-11-21
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description