6PCE

Human Coa6

• PDB DOI:  https://doi.org/10.2210/pdb6PCE/pdb

• Classification: METAL BINDING PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2019-06-17 Released: 2019-10-02 
• Deposition Author(s): Maher, M.J., Maghool, S.
• Funding Organization(s): Australian Research Council (ARC), National Health and Medical Research Council (NHMRC, Australia)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free: 0.229 
• R-Value Work: 0.188 
• R-Value Observed: 0.192 

Literature

Structural and functional characterization of the mitochondrial complex IV assembly factor Coa6.

Maghool, S., Cooray, N.D.G., Stroud, D.A., Aragao, D., Ryan, M.T., Maher, M.J.

(2019) Life Sci Alliance 2

• PubMed: 31515291 
• DOI: https://doi.org/10.26508/lsa.201900458
• Primary Citation of Related Structures:  
  6PCE, 6PCF


• PubMed Abstract: 
  

Assembly factors play key roles in the biogenesis of many multi-subunit protein complexes regulating their stability, activity, and the incorporation of essential cofactors. The human assembly factor Coa6 participates in the biogenesis of the Cu _A site in complex IV (cytochrome c oxidase, COX). Patients with mutations in Coa6 suffer from mitochondrial disease due to complex IV deficiency. Here, we present the crystal structures of human Coa6 and the pathogenic ^W59C Coa6-mutant protein. These structures show that Coa6 has a 3-helical bundle structure, with the first 2 helices tethered by disulfide bonds, one of which likely provides the copper-binding site. Disulfide-mediated oligomerization of the ^W59C Coa6 protein provides a structural explanation for the loss-of-function mutation.

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Organizational Affiliation: 

School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Australia.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

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

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 17.2 kDa 
• Atom Count: 1,184 
• Modelled Residue Count: 130 
• Deposited Residue Count: 140 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cytochrome c oxidase assembly factor 6 homolog	A, B	70	Homo sapiens	Mutation(s): 0  Gene Names: COA6, C1orf31
UniProt & NIH Common Fund Data Resources
Find proteins for Q5JTJ3 (Homo sapiens) Explore Q5JTJ3  Go to UniProtKB:  Q5JTJ3
PHAROS:  Q5JTJ3

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	C [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.65 Å
• R-Value Free: 0.229 
• R-Value Work: 0.188 
• R-Value Observed: 0.192 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 31.95	α = 90
b = 52.409	β = 90
c = 78.296	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data reduction
SCALEPACK	data scaling
SHELXDE	phasing
REFMAC	refinement

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2019-10-02 
Deposition Author(s): Maher, M.J., Maghool, S.

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Funding Organization	Location	Grant Number
Australian Research Council (ARC)	Australia	DP140102746
National Health and Medical Research Council (NHMRC, Australia)	Australia	GNT1165217
National Health and Medical Research Council (NHMRC, Australia)	Australia	GNT1140851

Revision History  

• Version 1.0: 2019-10-02
  Type: Initial release
  
• Version 1.1: 2020-01-01
  Changes: Author supporting evidence