Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

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

Macromolecule Content

• Total Structure Weight: 20.09 kDa 
• Atom Count: 1,226 
• Modelled Residue Count: 144 
• Deposited Residue Count: 150 
• Unique protein chains: 1

 2CJ7

Crystal Structure of a Cell Wall Invertase Inhibitor from Tobacco (pH 9.0)

• PDB DOI:  https://doi.org/10.2210/pdb2CJ7/pdb

• Classification: INHIBITOR
• Organism(s): Nicotiana tabacum
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2006-03-29 Released: 2006-04-03 
• Deposition Author(s): Hothorn, M., Scheffzek, K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.225 
• R-Value Work: 0.185 
• R-Value Observed: 0.187 

Literature

Multiple Crystal Forms of the Cell-Wall Invertase Inhibitor from Tobacco Support High Conformational Rigidity Over a Broad Ph-Range

Hothorn, M., Scheffzek, K.

(2006) Acta Crystallogr D Biol Crystallogr 62: 665

• PubMed: 16699194 
• DOI: https://doi.org/10.1107/S0907444906011693
• Primary Citation of Related Structures:  
  2CJ4, 2CJ5, 2CJ6, 2CJ7, 2CJ8


• PubMed Abstract: 
  

Plant acid invertases catalyse the breakdown of sucrose. Their activity is tightly regulated through interaction with specific protein inhibitors. The complex between the cell-wall invertase inhibitor Nt-CIF and its target enzyme is stable only at acidic pH, as found in the plant cell wall. Since the pH in this compartment can be modulated between pH 4 and 6 in planta, the rapid dissociation of the inhibitor-enzyme complex at neutral pH may represent a regulatory event. Here, it is analyzed whether the inhibitory component undergoes structural rearrangements upon changes in the pH environment. Six crystal forms grown at pH 4.6-9.5 and diffracting up to 1.63 Angstrom indicate only small structural changes in CIF. This suggests that complex dissociation at neutral pH is mediated either by rearrangements in the enzyme or by a complex pattern of surface charges in the inhibitor-enzyme binding interface.

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Organizational Affiliation: 

European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
INVERTASE INHIBITOR	A	150	Nicotiana tabacum	Mutation(s): 0  Gene Names: LOC107808322
UniProt
Find proteins for O49908 (Nicotiana tabacum) Explore O49908  Go to UniProtKB:  O49908

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IOD	AA [auth A], B [auth A], BA [auth A], C [auth A], CA [auth A], D [auth A], DA [auth A], E [auth A], EA [auth A], F [auth A], FA [auth A], G [auth A], GA [auth A], H [auth A], I [auth A], J [auth A], K [auth A], L [auth A], M [auth A], N [auth A], O [auth A], P [auth A], Q [auth A], R [auth A], S [auth A], T [auth A], U [auth A], V [auth A], W [auth A], X [auth A], Y [auth A], Z [auth A]	IODIDE ION I XMBWDFGMSWQBCA-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.80 Å
• R-Value Free: 0.225 
• R-Value Work: 0.185 
• R-Value Observed: 0.187 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 59.69	α = 90
b = 107.43	β = 90
c = 56.32	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
XDS	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2006-04-03 
Deposition Author(s): Hothorn, M., Scheffzek, K.

Revision History  

• Version 1.0: 2006-04-03
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance