2AFH

Crystal Structure of Nucleotide-Free Av2-Av1 Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.172 

Starting Models: experimental
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This is version 1.4 of the entry. See complete history


Literature

Nitrogenase Complexes: Multiple Docking Sites for a Nucleotide Switch Protein

Tezcan, F.A.Kaiser, J.T.Mustafi, D.Walton, M.Y.Howard, J.B.Rees, D.C.

(2005) Science 309: 1377-1380

  • DOI: https://doi.org/10.1126/science.1115653
  • Primary Citation of Related Structures:  
    2AFH, 2AFI, 4WZB

  • PubMed Abstract: 

    Adenosine triphosphate (ATP) hydrolysis in the nitrogenase complex controls the cycle of association and dissociation between the electron donor adenosine triphosphatase (ATPase) (Fe-protein) and its target catalytic protein (MoFe-protein), driving the reduction of dinitrogen into ammonia. Crystal structures in different nucleotide states have been determined that identify conformational changes in the nitrogenase complex during ATP turnover. These structures reveal distinct and mutually exclusive interaction sites on the MoFe-protein surface that are selectively populated, depending on the Fe-protein nucleotide state. A consequence of these different docking geometries is that the distance between redox cofactors, a critical determinant of the intermolecular electron transfer rate, is coupled to the nucleotide state. More generally, stabilization of distinct docking geometries by different nucleotide states, as seen for nitrogenase, could enable nucleotide hydrolysis to drive the relative motion of protein partners in molecular motors and other systems.


  • Organizational Affiliation

    Division of Chemistry and Chemical Engineering, California Institute of Technology, Mail Code 114-96, Pasadena, CA 91125, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Nitrogenase molybdenum-iron protein
A, C
491Azotobacter vinelandiiMutation(s): 0 
EC: 1.18.6.1
UniProt
Find proteins for P07328 (Azotobacter vinelandii)
Explore P07328 
Go to UniProtKB:  P07328
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP07328
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Nitrogenase molybdenum-iron protein
B, D
522Azotobacter vinelandiiMutation(s): 0 
EC: 1.18.6.1
UniProt
Find proteins for P07329 (Azotobacter vinelandii)
Explore P07329 
Go to UniProtKB:  P07329
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP07329
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Nitrogenase iron protein 1
E, F
289Azotobacter vinelandiiMutation(s): 0 
EC: 1.18.6.1
UniProt
Find proteins for P00459 (Azotobacter vinelandii)
Explore P00459 
Go to UniProtKB:  P00459
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00459
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 12 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CFN
Query on CFN

Download Ideal Coordinates CCD File 
H [auth A],
T [auth C]
FE(7)-MO-S(9)-N CLUSTER
Fe7 Mo N S9
OSSJGSCTDHHOOW-UHFFFAOYSA-N
CLF
Query on CLF

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M [auth B],
U [auth C]
FE(8)-S(7) CLUSTER
Fe8 S7
JKVMXLBGZBULKV-UHFFFAOYSA-N
SF4
Query on SF4

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GA [auth E]IRON/SULFUR CLUSTER
Fe4 S4
LJBDFODJNLIPKO-UHFFFAOYSA-N
P6G
Query on P6G

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CA [auth D]HEXAETHYLENE GLYCOL
C12 H26 O7
IIRDTKBZINWQAW-UHFFFAOYSA-N
1PE
Query on 1PE

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Q [auth B],
X [auth C]
PENTAETHYLENE GLYCOL
C10 H22 O6
JLFNLZLINWHATN-UHFFFAOYSA-N
HCA
Query on HCA

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G [auth A],
S [auth C]
3-HYDROXY-3-CARBOXY-ADIPIC ACID
C7 H10 O7
XKJVEVRQMLKSMO-SSDOTTSWSA-N
PG4
Query on PG4

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HA [auth E],
P [auth B]
TETRAETHYLENE GLYCOL
C8 H18 O5
UWHCKJMYHZGTIT-UHFFFAOYSA-N
PGE
Query on PGE

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AA [auth D]
BA [auth D]
DA [auth D]
I [auth A]
J [auth A]
AA [auth D],
BA [auth D],
DA [auth D],
I [auth A],
J [auth A],
O [auth B],
W [auth C],
Y [auth C]
TRIETHYLENE GLYCOL
C6 H14 O4
ZIBGPFATKBEMQZ-UHFFFAOYSA-N
TRS
Query on TRS

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N [auth B],
V [auth C]
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
PEG
Query on PEG

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EA [auth D],
FA [auth D],
R [auth B]
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
CA
Query on CA

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K [auth B],
Z [auth D]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
NA
Query on NA

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L [auth B]SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.172 
  • R-Value Observed: 0.172 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 170.911α = 90
b = 75.893β = 90
c = 223.665γ = 90
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2005-09-06
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-11-20
    Changes: Advisory, Derived calculations
  • Version 1.4: 2023-08-23
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description