Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 6-mer - A4B1C1 Pseudo Symmetry: Asymmetric - C1 
Pseudo Stoichiometry: Hetero 6-mer - A4B2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 241.28 kDa 
• Atom Count: 14998 
• Modelled Residue Count: 1960 
• Deposited Residue Count: 2172 
• Unique protein chains: 3

1T9G

Structure of the human MCAD:ETF complex

• DOI: 10.2210/pdb1T9G/pdb

• Classification: oxidoreductase, electron transport
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2004-05-17 Released: 2004-06-08 
• Deposition Author(s): Toogood, H.S., van Thiel, A., Basran, J., Sutcliffe, M.J., Scrutton, N.S., Leys, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.263 
• R-Value Work: 0.191 
• R-Value Observed: 0.195 

Literature

Extensive domain motion and electron transfer in the human electron transferring flavoprotein-medium chain Acyl-CoA dehydrogenase complex

Toogood, H.S., van Thiel, A., Basran, J., Sutcliffe, M.J., Scrutton, N.S., Leys, D.

(2004) J Biol Chem 279: 32904-32912

• PubMed: 15159392 
• DOI: 10.1074/jbc.M404884200
• Primary Citation of Related Structures:  
  1T9G


• PubMed Abstract: 
  

The crystal structure of the human electron transferring flavoprotein (ETF).medium chain acyl-CoA dehydrogenase (MCAD) complex reveals a dual mode of protein-protein interaction, imparting both specificity and promiscuity in the interaction of ETF with a range of structurally distinct primary dehydrogenases. ETF partitions the functions of partner binding and electron transfer between (i) the recognition loop, which acts as a static anchor at the ETF.MCAD interface, and (ii) the highly mobile redox active FAD domain. Together, these enable the FAD domain of ETF to sample a range of conformations, some compatible with fast interprotein electron transfer. Disorders in amino acid or fatty acid catabolism can be attributed to mutations at the protein-protein interface. Crucially, complex formation triggers mobility of the FAD domain, an induced disorder that contrasts with general models of protein-protein interaction by induced fit mechanisms. The subsequent interfacial motion in the MCAD.ETF complex is the basis for the interaction of ETF with structurally diverse protein partners. Solution studies using ETF and MCAD with mutations at the protein-protein interface support this dynamic model and indicate ionic interactions between MCAD Glu(212) and ETF Arg alpha(249) are likely to transiently stabilize productive conformations of the FAD domain leading to enhanced electron transfer rates between both partners.

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Organizational Affiliation: 

Department of Biochemistry, University of Leicester, Leicester LE1 7RH, United Kingdom.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Acyl-CoA dehydrogenase, medium-chain specific, mitochondrial	A, B, C, D	396	Homo sapiens	Mutation(s): 0  Gene Names: ACADM EC: 1.3.99.3 (PDB Primary Data), 1.3.8.7 (UniProt)
Find proteins for P11310 (Homo sapiens) Explore P11310  Go to UniProtKB:  P11310
NIH Common Fund Data Resources
PHAROS:  P11310 GTEx:  ENSG00000117054

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Electron transfer flavoprotein alpha-subunit, mitochondrial	E [auth R]	333	Homo sapiens	Mutation(s): 0  Gene Names: ETFA
Find proteins for P13804 (Homo sapiens) Explore P13804  Go to UniProtKB:  P13804
NIH Common Fund Data Resources
PHAROS:  P13804 GTEx:  ENSG00000140374

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Electron transfer flavoprotein beta-subunit	F [auth S]	255	Homo sapiens	Mutation(s): 0  Gene Names: ETFB, FP585
Find proteins for P38117 (Homo sapiens) Explore P38117  Go to UniProtKB:  P38117
NIH Common Fund Data Resources
PHAROS:  P38117 GTEx:  ENSG00000105379

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FAD	G [auth A], H [auth B], I [auth C], J [auth D]	FLAVIN-ADENINE DINUCLEOTIDE C27 H33 N9 O15 P2 VWWQXMAJTJZDQX-UYBVJOGSSA-N
AMP	K [auth S]	ADENOSINE MONOPHOSPHATE C10 H14 N5 O7 P UDMBCSSLTHHNCD-KQYNXXCUSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.263 
• R-Value Work: 0.191 
• R-Value Observed: 0.195 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 94.333	α = 90
b = 101.322	β = 90
c = 244.785	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-05-17 
• Released Date: 2004-06-08 
Deposition Author(s): Toogood, H.S., van Thiel, A., Basran, J., Sutcliffe, M.J., Scrutton, N.S., Leys, D.

Revision History  

• Version 1.0: 2004-06-08
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance