1BLV | pdb_00001blv

SOLUTION STRUCTURE OF OXIDIZED RAT MICROSOMAL CYTOCHROME B5 IN THE PRESENCE OF 2 M GUANIDINIUM CHLORIDE: MONITORING THE EARLY STEPS IN PROTEIN UNFOLDING

• PDB DOI: https://doi.org/10.2210/pdb1BLV/pdb

• Classification: ELECTRON TRANSPORT
• Organism(s): Rattus norvegicus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1998-07-21 Released: 1998-07-29 
• Deposition Author(s): Arnesano, F., Banci, L., Bertini, I., Koulougliotis, D.

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 40 
• Conformers Submitted: 1 
• Selection Criteria: MINIMIZED AVERAGE STRUCTURE 

Literature

Solution structure of oxidized rat microsomal cytochrome b5 in the presence of 2 M guanidinium chloride: monitoring the early steps in protein unfolding.

Arnesano, F., Banci, L., Bertini, I., Koulougliotis, D.

(1998) Biochemistry 37: 17082-17092

• PubMed: 9836603 
• DOI: https://doi.org/10.1021/bi981546p
• Primary Citation of Related Structures:  
  1BLV


• PubMed Abstract: 
  

  One- and two-dimensional proton NMR spectroscopy has been employed in order to study the denaturation effect of guanidinium chloride (GdmCl) on the oxidized state of the A-form of rat microsomal cytochrome b5 (cyt b5). The protein rapidly starts losing the heme at denaturant concentrations larger than approximately 2.0 M and a largely unfolded protein is eventually obtained. An estimate of the unfolding kinetics is obtained and, by use of a two-state model (folded left and right arrow unfolded), a value for DeltaG degrees. Below this concentration, small (

---

Organizational Affiliation: 

Department of Chemistry, University of Florence, Florence, Italy.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 11.43 kDa 
• Atom Count: 806 
• Modelled Residue Count: 94 
• Deposited Residue Count: 94 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (CYTOCHROME B5)	A	94	Rattus norvegicus	Mutation(s): 0
UniProt
Find proteins for P00173 (Rattus norvegicus) Explore P00173  Go to UniProtKB:  P00173

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
HEM	B [auth A]	PROTOPORPHYRIN IX CONTAINING FE C34 H32 Fe N4 O4 KABFMIBPWCXCRK-RGGAHWMASA-L

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 40 
• Conformers Submitted: 1 
• Selection Criteria: MINIMIZED AVERAGE STRUCTURE 

Structure Validation

Entry History 

Deposition Data

• Released Date: 1998-07-29 
Deposition Author(s): Arnesano, F., Banci, L., Bertini, I., Koulougliotis, D.

Revision History  

• Version 1.0: 1998-07-29
  Type: Initial release
  
• Version 1.1: 2007-10-16
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-02-16
  Changes: Data collection, Database references, Derived calculations
• Version 1.4: 2024-05-22
  Changes: Data collection