Biological Assembly 1  

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Global Symmetry: Dihedral - D4  (3D View)
Global Stoichiometry: Homo 8-mer - A8 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 468689.94 
• Atom Count: 32992 
• Residue Count: 4096 
• Unique protein chains: 1

4EQV

Structure of Saccharomyces cerevisiae invertase

• DOI: 10.2210/pdb4EQV/pdb

• Classification: HYDROLASE
• Organism(s): Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
• Expression System: Escherichia coli


• Deposited: 2012-04-19 Released: 2013-03-06 
• Deposition Author(s): Sainz-Polo, M.A., Sanz-Aparicio, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.4 Å
• R-Value Free: 0.239 
• R-Value Work: 0.221 

Literature

Three-dimensional Structure of Saccharomyces Invertase: ROLE OF A NON-CATALYTIC DOMAIN IN OLIGOMERIZATION AND SUBSTRATE SPECIFICITY.

Sainz-Polo, M.A., Ramirez-Escudero, M., Lafraya, A., Gonzalez, B., Marin-Navarro, J., Polaina, J., Sanz-Aparicio, J.

(2013) J.Biol.Chem. 288: 9755-9766

• PubMed: 23430743 
• DOI: 10.1074/jbc.M112.446435


• PubMed Abstract: 
  

Invertase is an enzyme that is widely distributed among plants and microorganisms and that catalyzes the hydrolysis of the disaccharide sucrose into glucose and fructose. Despite the important physiological role of Saccharomyces invertase (SInv) and the historical relevance of this enzyme as a model in early biochemical studies, its structure had not yet been solved. We report here the crystal structure of recombinant SInv at 3.3 Å resolution showing that the enzyme folds into the catalytic β-propeller and β-sandwich domains characteristic of GH32 enzymes. However, SInv displays an unusual quaternary structure. Monomers associate in two different kinds of dimers, which are in turn assembled into an octamer, best described as a tetramer of dimers. Dimerization plays a determinant role in substrate specificity because this assembly sets steric constraints that limit the access to the active site of oligosaccharides of more than four units. Comparative analysis of GH32 enzymes showed that formation of the SInv octamer occurs through a β-sheet extension that seems unique to this enzyme. Interaction between dimers is determined by a short amino acid sequence at the beginning of the β-sandwich domain. Our results highlight the role of the non-catalytic domain in fine-tuning substrate specificity and thus supplement our knowledge of the activity of this important family of enzymes. In turn, this gives a deeper insight into the structural features that rule modularity and protein-carbohydrate recognition.

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Organizational Affiliation: 

Departamento de Cristalografía y Biología Estructural, Instituto de Química-Física Rocasolano, Consejo Superior de Investigaciones Científicas, Serrano 119, 28006 Madrid, Spain.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Invertase 2	A, B, C, D, E, F, G, H	512	Saccharomyces cerevisiae (strain ATCC 204508 / S288c)	Mutation(s): 0  Gene Names: SUC2 EC: 3.2.1.26
Find proteins for P00724 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Go to UniProtKB:  P00724

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.4 Å
• R-Value Free: 0.239 
• R-Value Work: 0.221 
• Space Group: P 3₁ 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 268.659	α = 90.00
b = 268.659	β = 90.00
c = 224.452	γ = 120.00

Software Package:

Software Name	Purpose
MOSFLM	data reduction
SCALA	data scaling
ADSC	data collection
MOLREP	phasing
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-04-19 
• Released Date: 2013-03-06 
• Deposition Author(s): Sainz-Polo, M.A., Sanz-Aparicio, J.

Revision History 

• Version 1.0: 2013-03-06
  Type: Initial release
• Version 1.1: 2013-04-24
  Type: Database references