1BIF

6-PHOSPHOFRUCTO-2-KINASE/FRUCTOSE-2,6-BISPHOSPHATASE BIFUNCTIONAL ENZYME COMPLEXED WITH ATP-G-S AND PHOSPHATE

• PDB DOI: https://doi.org/10.2210/pdb1BIF/pdb
• BMRB: 5935

• Classification: BIFUNCTIONAL ENZYME
• Organism(s): Rattus norvegicus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1996-11-08 Released: 1997-11-12 
• Deposition Author(s): Hasemann, C.A., Deisenhofer, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.250 
• R-Value Work: 0.183 
• R-Value Observed: 0.183 

Literature

The crystal structure of the bifunctional enzyme 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase reveals distinct domain homologies.

Hasemann, C.A., Istvan, E.S., Uyeda, K., Deisenhofer, J.

(1996) Structure 4: 1017-1029

• PubMed: 8805587 
• DOI: https://doi.org/10.1016/s0969-2126(96)00109-8
• Primary Citation of Related Structures:  
  1BIF


• PubMed Abstract: 
  

  Glucose homeostasis is maintained by the processes of glycolysis and gluconeogenesis. The importance of these pathways is demonstrated by the severe and life threatening effects observed in various forms of diabetes. The bifunctional enzyme 6-phosphofructo-2-kinase/fructose-2,6-bisphosphatase catalyzes both the synthesis and degradation of fructose-2,6-bisphosphate, a potent regulator of glycolysis. Thus this bifunctional enzyme plays an indirect yet key role in the regulation of glucose metabolism.

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Organizational Affiliation: 

Department of Internal Medicine, University of Texas Southwestern Medical Center, 5323 Harry Hines Blvd., Dallas, TX 75235-8884, USA. [e-mail]

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 54.9 kDa 
• Atom Count: 3,900 
• Modelled Residue Count: 432 
• Deposited Residue Count: 469 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
6-PHOSPHOFRUCTO-2-KINASE/ FRUCTOSE-2,6-BISPHOSPHATASE	A	469	Rattus norvegicus	Mutation(s): 0  Gene Names: RT2K EC: 2.7.1.105 (PDB Primary Data), 3.1.3.46 (PDB Primary Data)
UniProt
Find proteins for P25114 (Rattus norvegicus) Explore P25114  Go to UniProtKB:  P25114

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
AGS	E [auth A]	PHOSPHOTHIOPHOSPHORIC ACID-ADENYLATE ESTER C10 H16 N5 O12 P3 S NLTUCYMLOPLUHL-KQYNXXCUSA-N
PO4	C [auth A], D [auth A]	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K
GOL	F [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N
MG	B [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.250 
• R-Value Work: 0.183 
• R-Value Observed: 0.183 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 83	α = 90
b = 83	β = 90
c = 130.6	γ = 120

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-11-12 
Deposition Author(s): Hasemann, C.A., Deisenhofer, J.

Revision History  

• Version 1.0: 1997-11-12
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 1.3: 2012-02-15
  Changes: Non-polymer description
• Version 1.4: 2024-02-07
  Changes: Data collection, Database references, Derived calculations, Other