7MRX

Cryogenic crystal structure of barnase A43C/S80C bound to barstar C40A/C82A

• PDB DOI: https://doi.org/10.2210/pdb7MRX/pdb

• Classification: RNA BINDING PROTEIN/Inhibitor
• Organism(s): Bacillus amyloliquefaciens
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2021-05-10 Released: 2022-05-18 
• Deposition Author(s): Caro, J.A., Smith, J., Wand, A.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.29 Å
• R-Value Free: 0.229 
• R-Value Work: 0.183 
• R-Value Observed: 0.185 

Literature

Conformational entropy and protein affinity

Caro, J.A., Wand, A.J.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 2 assigned by authors.

Biological Assembly 3  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

Biological assembly 3 assigned by authors.

Macromolecule Content

• Total Structure Weight: 74.3 kDa 
• Atom Count: 5,114 
• Modelled Residue Count: 591 
• Deposited Residue Count: 654 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Ribonuclease	A, C, E	128	Bacillus amyloliquefaciens	Mutation(s): 2  EC: 3.1.27
UniProt
Find proteins for P00648 (Bacillus amyloliquefaciens) Explore P00648  Go to UniProtKB:  P00648

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Barstar	B, D, F	90	Bacillus amyloliquefaciens	Mutation(s): 2
UniProt
Find proteins for P11540 (Bacillus amyloliquefaciens) Explore P11540  Go to UniProtKB:  P11540

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.29 Å
• R-Value Free: 0.229 
• R-Value Work: 0.183 
• R-Value Observed: 0.185 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 50.317	α = 90
b = 87.86	β = 90
c = 162.492	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
SCALEPACK	data scaling
PHASER	phasing
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

Deposition Data

• Released Date: 2022-05-18 
Deposition Author(s): Caro, J.A., Smith, J., Wand, A.J.

Revision History  

• Version 1.0: 2022-05-18
  Type: Initial release
  
• Version 1.1: 2023-10-18
  Changes: Data collection, Refinement description