6NU1

Crystal Structure of Human PKM2 in Complex with L-cysteine


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Mechanistic and Structural Insights into Cysteine-Mediated Inhibition of Pyruvate Kinase Muscle Isoform 2.

Srivastava, D.Nandi, S.Dey, M.

(2019) Biochemistry 58: 3669-3682

  • DOI: 10.1021/acs.biochem.9b00349
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Cancer cells regulate key enzymes in the glycolytic pathway to control the glycolytic flux, which is necessary for their growth and proliferation. One of the enzymes is pyruvate kinase muscle isoform 2 (PKM2), which is allosterically regulated by var ...

    Cancer cells regulate key enzymes in the glycolytic pathway to control the glycolytic flux, which is necessary for their growth and proliferation. One of the enzymes is pyruvate kinase muscle isoform 2 (PKM2), which is allosterically regulated by various small molecules. Using detailed biochemical and kinetic studies, we demonstrate that cysteine inhibits wild-type (wt) PKM2 by shifting from an active tetramer to a mixture of a tetramer and a less active dimer/monomer equilibrium and that the inhibition is dependent on cysteine concentration. The cysteine-mediated PKM2 inhibition is reversed by fructose 1,6-bisphosphate, an allosteric activator of PKM2. Furthermore, kinetic studies using two dimeric PKM2 variants, S437Y PKM2 and G415R PKM2, show that the reversal is caused by the tetramerization of wtPKM2. The crystal structure of the wtPKM2-Cys complex was determined at 2.25 Å, which showed that cysteine is held to the amino acid binding site via its main chain groups, similar to that observed for phenylalanine, alanine, serine, and tryptophan. Notably, ligand binding studies using fluorescence and isothermal titration calorimetry show that the presence of phosphoenolpyruvate alters the binding affinities of amino acids for wtPKM2 and vice versa, thereby unravelling the existence of a functionally bidirectional coupling between the amino acid binding site and the active site of wtPKM2.


    Organizational Affiliation

    Department of Chemistry , The University of Iowa , Iowa City , Iowa 52242 , United States.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Pyruvate kinase PKM
A, B, C, D
551Homo sapiensMutation(s): 0 
Gene Names: PKM (OIP3, PK2, PK3, PKM2)
EC: 2.7.1.40
Find proteins for P14618 (Homo sapiens)
Go to Gene View: PKM
Go to UniProtKB:  P14618
Small Molecules
Ligands 5 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download SDF File 
Download CCD File 
B, D
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
OXL
Query on OXL

Download SDF File 
Download CCD File 
A, B, C, D
OXALATE ION
C2 O4
MUBZPKHOEPUJKR-UHFFFAOYSA-L
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B, C, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
FBP
Query on FBP

Download SDF File 
Download CCD File 
A, B, C, D
BETA-FRUCTOSE-1,6-DIPHOSPHATE
FRUCTOSE-1,6-BISPHOSPHATE
C6 H14 O12 P2
RNBGYGVWRKECFJ-ARQDHWQXSA-N
 Ligand Interaction
CYS
Query on CYS

Download SDF File 
Download CCD File 
A, B, C, D
CYSTEINE
C3 H7 N O2 S
XUJNEKJLAYXESH-REOHCLBHSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.191 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 81.829α = 90.00
b = 155.918β = 103.51
c = 94.136γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
PHASERphasing
Cootmodel building
SCALAdata scaling
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United StatesCLP 1506181

Revision History 

  • Version 1.0: 2019-08-21
    Type: Initial release
  • Version 1.1: 2019-09-18
    Type: Data collection, Database references
  • Version 1.2: 2019-11-27
    Type: Author supporting evidence