1MKZ

Crystal structure of MoaB protein at 1.6 A resolution.

• PDB DOI: https://doi.org/10.2210/pdb1MKZ/pdb

• Classification: BIOSYNTHETIC PROTEIN
• Organism(s): Escherichia coli
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): Yes 


• Deposited: 2002-08-29 Released: 2003-04-22 
• Deposition Author(s): Sanishvili, R., Skarina, T., Joachimiak, A., Edwards, A., Savchenko, A., Midwest Center for Structural Genomics (MCSG)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.219 
• R-Value Work: 0.183 
• R-Value Observed: 0.185 

Literature

The crystal structure of Escherichia coli MoaB suggests a probable role in molybdenum cofactor synthesis.

Sanishvili, R., Beasley, S., Skarina, T., Glesne, D., Joachimiak, A., Edwards, A., Savchenko, A.

(2004) J Biol Chem 279: 42139-42146

• PubMed: 15269205 
• DOI: https://doi.org/10.1074/jbc.M407694200
• Primary Citation of Related Structures:  
  1MKZ


• PubMed Abstract: 
  

  The crystal structure of Escherichia coli MoaB was determined by multiwavelength anomalous diffraction phasing and refined at 1.6-A resolution. The molecule displayed a modified Rossman fold. MoaB is assembled into a hexamer composed of two trimers. The monomers have high structural similarity with two proteins, MogA and MoeA, from the molybdenum cofactor synthesis pathway in E. coli, as well as with domains of mammalian gephyrin and plant Cnx1, which are also involved in molybdopterin synthesis. Structural comparison between these proteins and the amino acid conservation patterns revealed a putative active site in MoaB. The structural analysis of this site allowed to advance several hypothesis that can be tested in further studies.

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Organizational Affiliation: 

Biosciences, Structural Biology Center, Midwest Center for Sructural Genomics, Argonne National Laboratory, Argonne, Illinois 60439, USA.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 38.73 kDa 
• Atom Count: 2,961 
• Modelled Residue Count: 341 
• Deposited Residue Count: 344 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Molybdenum cofactor biosynthesis protein B	A, B	172	Escherichia coli	Mutation(s): 3  Gene Names: MoaB
UniProt
Find proteins for P0AEZ9 (Escherichia coli (strain K12)) Explore P0AEZ9  Go to UniProtKB:  P0AEZ9

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	C [auth A], D [auth A], E [auth A], F [auth A], H [auth B], I [auth B], J [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
ACY	G [auth A], K [auth B], L [auth B]	ACETIC ACID C2 H4 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A, B	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.219 
• R-Value Work: 0.183 
• R-Value Observed: 0.185 
• Space Group: P 3 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 69.169	α = 90
b = 69.169	β = 90
c = 126.184	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
HKL-2000	data reduction
CNS	refinement
WARP	model building
d*TREK	data scaling
d*TREK	data reduction
HKL-2000	data scaling
CNS	phasing
ARP/wARP	model building

Structure Validation

Entry History 

Deposition Data

• Released Date: 2003-04-22 
Deposition Author(s): Sanishvili, R., Skarina, T., Joachimiak, A., Edwards, A., Savchenko, A., Midwest Center for Structural Genomics (MCSG)

Revision History  

• Version 1.0: 2003-04-22
  Type: Initial release
  
• Version 1.1: 2008-04-28
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-11
  Changes: Refinement description
• Version 1.4: 2019-07-24
  Changes: Data collection, Derived calculations, Refinement description
• Version 1.5: 2024-03-06
  Changes: Data collection, Database references, Derived calculations