Human muscle fructose-1,6-bisphosphatase E69Q mutant in complex with AMP and alpha fructose-6-phosphate

Experimental Data Snapshot

  • Resolution: 1.97 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.167 

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Structure of E69Q mutant of human muscle fructose-1,6-bisphosphatase

Zarzycki, M.Kolodziejczyk, R.Maciaszczyk-Dziubinska, E.Wysocki, R.Jaskolski, M.Dzugaj, A.

(2011) Acta Crystallogr D Biol Crystallogr 67: 1028-1034

  • DOI: https://doi.org/10.1107/S090744491104385X
  • Primary Citation of Related Structures:  
    3IFA, 3IFC

  • PubMed Abstract: 

    Human fructose-1,6-bisphosphatase is an allosteric enzyme that is regulated by different ligands. There are only two known isozymes in human tissues: the liver isozyme (the key enzyme of gluconeogenesis), which is regulated by fructose 2,6-bisphosphate, and its muscle counterpart (participating in glycogen synthesis), which is regulated by calcium ions. AMP, which is an allosteric inhibitor of both isozymes, inhibits the muscle isozyme with an I(0.5) that is 35-100 times lower than for the liver isozyme and the reason for this difference remains obscure. In studies aiming at an explanation of the main differences in the regulation of the two isozymes, it has been shown that only one residue, in position 69, regulates the sensitivity towards calcium ions. As a consequence of this finding, an E69Q mutant of the muscle isozyme, which is insensitive to calcium ions while retaining all other kinetic properties resembling the liver isozyme, has been prepared and crystallized. Here, two crystal structures of this mutant enzyme in complex with AMP with and without fructose 6-phosphate (the product of the catalytic reaction) are presented. The AMP binding pattern of the muscle isozyme is quite similar to that of the liver isozyme and the T conformations of the two isozymes are nearly the same.

  • Organizational Affiliation

    Institute of Genetics and Microbiology, Faculty of Biological Sciences, University of Wroclaw, ul. Przybyszewskiego 63/77, 51-148 Wroclaw, Poland.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fructose-1,6-bisphosphatase isozyme 2
A, B, C, D
338Homo sapiensMutation(s): 1 
Gene Names: 8789
UniProt & NIH Common Fund Data Resources
Find proteins for O00757 (Homo sapiens)
Explore O00757 
Go to UniProtKB:  O00757
PHAROS:  O00757
GTEx:  ENSG00000130957 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO00757
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on AMP

Download Ideal Coordinates CCD File 
E [auth A],
M [auth B],
R [auth C],
W [auth D]
C10 H14 N5 O7 P
Query on P6P

Download Ideal Coordinates CCD File 
F [auth A],
N [auth B],
S [auth C],
X [auth D]
C6 H13 O9 P
Query on SO4

Download Ideal Coordinates CCD File 
G [auth A]
H [auth A]
I [auth A]
O [auth B]
P [auth B]
G [auth A],
H [auth A],
I [auth A],
O [auth B],
P [auth B],
T [auth C],
U [auth C],
Y [auth D],
Z [auth D]
O4 S
Query on GOL

Download Ideal Coordinates CCD File 
AA [auth D]
J [auth A]
K [auth A]
L [auth A]
Q [auth B]
AA [auth D],
J [auth A],
K [auth A],
L [auth A],
Q [auth B],
V [auth C]
C3 H8 O3
Experimental Data & Validation

Experimental Data

  • Resolution: 1.97 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.167 
  • R-Value Observed: 0.167 
  • Space Group: C 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 218.14α = 90
b = 234.54β = 90
c = 71.75γ = 90
Software Package:
Software NamePurpose
MAR345data collection
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-08-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2013-03-13
    Changes: Database references, Refinement description
  • Version 1.3: 2017-11-01
    Changes: Advisory, Refinement description
  • Version 1.4: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Data collection, Database references, Derived calculations
  • Version 1.5: 2023-11-01
    Changes: Advisory, Data collection, Database references, Refinement description, Structure summary