4XXU

ModA - chromate bound

• PDB DOI: https://doi.org/10.2210/pdb4XXU/pdb

• Classification: METAL BINDING PROTEIN
• Organism(s): Escherichia coli K-12
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2015-01-30 Released: 2016-09-14 
• Deposition Author(s): He, C., Karpus, J., Ajiboye, I.
• Funding Organization(s): National Science Foundation (NSF, United States)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.43 Å
• R-Value Free: 0.180 
• R-Value Work: 0.160 
• R-Value Observed: 0.161 

Literature

Structure of chromate bound ModA from E.coli at 1.43 Angstroms resolution.

He, C., Karpus, J., Ajiboye, I., Zhang, L.

To be published.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 2-mer - A2 

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

Macromolecule Content

• Total Structure Weight: 55.02 kDa 
• Atom Count: 4,115 
• Modelled Residue Count: 462 
• Deposited Residue Count: 514 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Molybdate-binding periplasmic protein	A, B	257	Escherichia coli K-12	Mutation(s): 0  Gene Names: modA, b0763, JW0746
UniProt
Find proteins for P37329 (Escherichia coli (strain K12)) Explore P37329  Go to UniProtKB:  P37329

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CQ4	C [auth A], D [auth B]	Chromate Cr O4 ZCDOYSPFYFSLEW-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.43 Å
• R-Value Free: 0.180 
• R-Value Work: 0.160 
• R-Value Observed: 0.161 
• Space Group: P 3₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 84.049	α = 90
b = 84.049	β = 90
c = 60.239	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2016-09-14 
Deposition Author(s): He, C., Karpus, J., Ajiboye, I.

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Funding Organization	Location	Grant Number
National Science Foundation (NSF, United States)	United States	CHE-1213598

Revision History  

• Version 1.0: 2016-09-14
  Type: Initial release
  
• Version 1.1: 2017-09-13
  Changes: Author supporting evidence, Derived calculations
• Version 1.2: 2019-11-27
  Changes: Author supporting evidence
• Version 1.3: 2024-02-28
  Changes: Data collection, Database references