3LF5

Structure of Human NADH cytochrome b5 oxidoreductase (Ncb5or) b5 Domain to 1.25A Resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.147 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Study of the individual cytochrome b5 and cytochrome b5 reductase domains of Ncb5or reveals a unique heme pocket and a possible role of the CS domain.

Deng, B.Parthasarathy, S.Wang, W.Gibney, B.R.Battaile, K.P.Lovell, S.Benson, D.R.Zhu, H.

(2010) J Biol Chem 285: 30181-30191

  • DOI: 10.1074/jbc.M110.120329
  • Primary Citation of Related Structures:  
    3LF5

  • PubMed Abstract: 
  • NADH cytochrome b(5) oxidoreductase (Ncb5or) is found in animals and contains three domains similar to cytochrome b(5) (b(5)), CHORD-SGT1 (CS), and cytochrome b(5) reductase (b(5)R). Ncb5or has an important function, as suggested by the diabetes and lipoatrophy phenotypes in Ncb5or null mice ...

    NADH cytochrome b(5) oxidoreductase (Ncb5or) is found in animals and contains three domains similar to cytochrome b(5) (b(5)), CHORD-SGT1 (CS), and cytochrome b(5) reductase (b(5)R). Ncb5or has an important function, as suggested by the diabetes and lipoatrophy phenotypes in Ncb5or null mice. To elucidate the structural and functional properties of human Ncb5or, we generated its individual b(5) and b(5)R domains (Ncb5or-b(5) and Ncb5or-b(5)R, respectively) and compared them with human microsomal b(5) (Cyb5A) and b(5)R (Cyb5R3). A 1.25 Å x-ray crystal structure of Ncb5or-b(5) reveals nearly orthogonal planes of the imidazolyl rings of heme-ligating residues His(89) and His(112), consistent with a highly anisotropic low spin EPR spectrum. Ncb5or is the first member of the cytochrome b(5) family shown to have such a heme environment. Like other b(5) family members, Ncb5or-b(5) has two helix-loop-helix motifs surrounding heme. However, Ncb5or-b(5) differs from Cyb5A with respect to location of the second heme ligand (His(112)) and of polypeptide conformation in its vicinity. Electron transfer from Ncb5or-b(5)R to Ncb5or-b(5) is much less efficient than from Cyb5R3 to Cyb5A, possibly as a consequence of weaker electrostatic interactions. The CS linkage probably obviates the need for strong interactions between b(5) and b(5)R domains in Ncb5or. Studies with a construct combining the Ncb5or CS and b(5)R domains suggest that the CS domain facilitates docking of the b(5) and b(5)R domains. Trp(114) is an invariant surface residue in all known Ncb5or orthologs but appears not to contribute to electron transfer from the b(5)R domain to the b(5) domain.


    Organizational Affiliation

    Department of Clinical Laboratory Sciences, University of Kansas Medical Center, Kansas City, Kansas 66160, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Cytochrome b5 reductase 4A, B88Homo sapiensMutation(s): 0 
Gene Names: CYB5R4NCB5OR
EC: 1.6.2.2
Find proteins for Q7L1T6 (Homo sapiens)
Explore Q7L1T6 
Go to UniProtKB:  Q7L1T6
NIH Common Fund Data Resources
PHAROS:  Q7L1T6
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HEM
Query on HEM

Download Ideal Coordinates CCD File 
C [auth A], E [auth B]PROTOPORPHYRIN IX CONTAINING FE
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
SO4
Query on SO4

Download Ideal Coordinates CCD File 
D [auth A], F [auth B]SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.25 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.147 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.48α = 90
b = 56.37β = 100.67
c = 42.56γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-07-14
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2017-03-29
    Changes: Database references
  • Version 1.3: 2017-10-11
    Changes: Data collection