Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 238311.92 
• Atom Count: 15822 
• Residue Count: 2172 
• Unique protein chains: 1

4IP7

Structure of the S12D variant of human liver pyruvate kinase in complex with citrate and FBP.

• DOI: 10.2210/pdb4IP7/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): 1 


• Deposited: 2013-01-09 Released: 2013-01-30 
• Deposition Author(s): Holyoak, T., Fenton, A.W.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.226 
• R-Value Work: 0.187 

Literature

Energetic Coupling between an Oxidizable Cysteine and the Phosphorylatable N-Terminus of Human Liver Pyruvate Kinase.

Holyoak, T., Zhang, B., Deng, J., Tang, Q., Prasannan, C.B., Fenton, A.W.

(2013) Biochemistry 52: 466-476

• PubMed: 23270483 
• DOI: 10.1021/bi301341r
• Primary Citation of Related Structures:  
  4IMA


• PubMed Abstract: 
  

During our efforts to characterize the regulatory properties of human liver pyruvate kinase (L-PYK), we have noted that the affinity of the protein for phosphoenolpyruvate (PEP) becomes reduced several days after cell lysis. A 1.8 Å crystallographic structure of L-PYK with the S12D mimic of phosphorylation indicates that Cys436 is oxidized, the first potential insight into explaining the effect of "aging". Interestingly, the oxidation is only to sulfenic acid despite the crystal growth time period of 2 weeks. Mutagenesis confirms that the side chain of residue 436 is energetically coupled to PEP binding. Mass spectrometry confirms that the oxidation is present in solution and is not an artifact caused by X-ray exposure. Exposure of the L-PYK mutations to H₂O₂ also confirms that PEP affinity is sensitive to the nature of the side chain at position 436. A 1.95 Å structure of the C436M mutant of L-PYK, the only mutation at position 436 that has been shown to strengthen PEP affinity, revealed that the methionine substitution results in the ordering of several N-terminal residues that have not been ordered in previous structures. This result allowed speculation that oxidation of Cys436 and phosphorylation of the N-terminus at Ser12 may function through a similar mechanism, namely the interruption of an activating interaction between the nonphosphorylated N-terminus with the nonoxidized main body of the protein. Mutant cycles were used to provide evidence that mutations of Cys436 are energetically synergistic with N-terminal modifications, a result that is consistent with phosphorylation of the N-terminus and oxidation of Cys436 functioning through mechanisms with common features. Alanine-scanning mutagenesis was used to confirm that the newly ordered N-terminal residues were important to the regulation of enzyme function by the N-terminus of the enzyme (i.e., not an artifact caused by the introduced methionine substitution) and to further define which residues in the N-terminus are energetically coupled to PEP affinity. Collectively, these studies indicate energetic coupling (and potentially mechanistic similarities) between the oxidation of Cys436 and phosphorylation of Ser12 in the N-terminus of L-PYK.

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biology, The University of Kansas Medical Center, MS 3030, 3901 Rainbow Boulevard, Kansas City, KS 66160, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Pyruvate kinase isozymes L	A, B, C, D	543	Homo sapiens	Mutation(s): 1  Gene Names: PKLR (PK1, PKL) EC: 2.7.1.40
Find proteins for P30613 (Homo sapiens) Go to Gene View: PKLR Go to UniProtKB:  P30613

Small Molecules

Ligands 8 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
MN	A, B, C, D	MANGANESE (II) ION Mn WAEMQWOKJMHJLA-UHFFFAOYSA-N
NA	A, B, C, D	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N
ADN	D	ADENOSINE C10 H13 N5 O4 OIRDTQYFTABQOQ-KQYNXXCUSA-N
EDO	A, B, C, D	1,2-ETHANEDIOL ETHYLENE GLYCOL C2 H6 O2 LYCAIKOWRPUZTN-UHFFFAOYSA-N
PEG	A, B	DI(HYDROXYETHYL)ETHER C4 H10 O3 MTHSVFCYNBDYFN-UHFFFAOYSA-N
FLC	A, B, C, D	CITRATE ANION C6 H5 O7 KRKNYBCHXYNGOX-UHFFFAOYSA-K
FBP	A, B, C, D	BETA-FRUCTOSE-1,6-DIPHOSPHATE FRUCTOSE-1,6-BISPHOSPHATE C6 H14 O12 P2 RNBGYGVWRKECFJ-ARQDHWQXSA-N
1PE	C	PENTAETHYLENE GLYCOL PEG400 C10 H22 O6 JLFNLZLINWHATN-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.8 Å
• R-Value Free: 0.226 
• R-Value Work: 0.187 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 78.140	α = 90.00
b = 205.078	β = 92.15
c = 83.910	γ = 90.00

Software Package:

Software Name	Purpose
HKL-2000	data reduction
PDB_EXTRACT	data extraction
HKL-2000	data collection
HKL-2000	data scaling
MOLREP	phasing
SCALEPACK	data scaling
DENZO	data reduction
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2013-01-09 
• Released Date: 2013-01-30 
• Deposition Author(s): Holyoak, T., Fenton, A.W.

Revision History 

• Version 1.0: 2013-01-30
  Type: Initial release
• Version 1.1: 2013-02-06
  Type: Database references
• Version 1.2: 2017-11-15
  Type: Refinement description