Protein Kinase Domain of the Human 5'-AMP-activated protein kinase catalytic subunit alpha-2 (AMPK alpha-2 chain)

Experimental Data Snapshot

  • Resolution: 1.85 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 

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This is version 1.4 of the entry. See complete history


A conserved mechanism of autoinhibition for the AMPK kinase domain: ATP-binding site and catalytic loop refolding as a means of regulation.

Littler, D.R.Walker, J.R.Davis, T.Wybenga-Groot, L.E.Finerty, P.J.Newman, E.Mackenzie, F.Dhe-Paganon, S.

(2010) Acta Crystallogr Sect F Struct Biol Cryst Commun 66: 143-151

  • DOI: https://doi.org/10.1107/S1744309109052543
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The AMP-activated protein kinase (AMPK) is a highly conserved trimeric protein complex that is responsible for energy homeostasis in eukaryotic cells. Here, a 1.9 A resolution crystal structure of the isolated kinase domain from the alpha2 subunit of human AMPK, the first from a multicellular organism, is presented. This human form adopts a catalytically inactive state with distorted ATP-binding and substrate-binding sites. The ATP site is affected by changes in the base of the activation loop, which has moved into an inhibited DFG-out conformation. The substrate-binding site is disturbed by changes within the AMPKalpha2 catalytic loop that further distort the enzyme from a catalytically active form. Similar structural rearrangements have been observed in a yeast AMPK homologue in response to the binding of its auto-inhibitory domain; restructuring of the kinase catalytic loop is therefore a conserved feature of the AMPK protein family and is likely to represent an inhibitory mechanism that is utilized during function.

  • Organizational Affiliation

    The Structural Genomics Consortium, University of Toronto, 101 College Street, Toronto, Ontario M5G 1L7, Canada. dene@phys.unsw.edu.au

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
5'-AMP-activated protein kinase catalytic subunit alpha-2276Homo sapiensMutation(s): 0 
UniProt & NIH Common Fund Data Resources
Find proteins for P54646 (Homo sapiens)
Explore P54646 
Go to UniProtKB:  P54646
PHAROS:  P54646
GTEx:  ENSG00000162409 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP54646
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.85 Å
  • R-Value Free: 0.227 
  • R-Value Work: 0.188 
  • R-Value Observed: 0.190 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 39.454α = 90
b = 67.41β = 91.3
c = 50.493γ = 90
Software Package:
Software NamePurpose
SBC-Collectdata collection
HKL-2000data reduction
RESOLVEmodel building
ARP/wARPmodel building
HKL-2000data scaling

Structure Validation

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Entry History 

Revision History  (Full details and data files)

  • Version 1.0: 2006-06-27
    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
  • Version 1.4: 2023-08-30
    Changes: Data collection, Database references, Refinement description