9OD6 | pdb_00009od6

Crystal structure of nucleoside-diphosphate kinase from Cryptosporidium parvum in complex with citrate

• PDB DOI: https://doi.org/10.2210/pdb9OD6/pdb

• Classification: TRANSFERASE
• Organism(s): Cryptosporidium parvum Iowa II
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2025-04-25 Released: 2025-05-07 
• Deposition Author(s): Seattle Structural Genomics Center for Infectious Disease, Seattle Structural Genomics Center for Infectious Disease (SSGCID)
• Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID), National Institutes of Health/Office of the Director

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.45 Å
• R-Value Free: 
  0.168 (Depositor), 0.177 (DCC) 
• R-Value Work: 
  0.132 (Depositor), 0.145 (DCC) 
• R-Value Observed: 
  0.134 (Depositor) 

Starting Model: in silico

Literature

Crystal structure of nucleoside-diphosphate kinase from Cryptosporidium parvum in complex with citrate

Liu, L., Lovell, S., Battaile, K.P.

To be published.

Biological Assembly 1  

Global Symmetry: Cyclic - C3  (Explore in 3D)
Global Stoichiometry: Homo 3-mer - A3 

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

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 53.41 kDa 
• Atom Count: 4,098 
• Modelled Residue Count: 447 
• Deposited Residue Count: 468 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
nucleoside-diphosphate kinase	A, B, C	156	Cryptosporidium parvum Iowa II	Mutation(s): 0  Gene Names: cgd4_1940 EC: 2.7.4.6
UniProt
Find proteins for Q5CR64 (Cryptosporidium parvum (strain Iowa II)) Explore Q5CR64  Go to UniProtKB:  Q5CR64

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CIT (Subject of Investigation/LOI)	D [auth A], E [auth B], F [auth C]	CITRIC ACID C6 H8 O7 KRKNYBCHXYNGOX-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.45 Å
• R-Value Free:  0.168 (Depositor), 0.177 (DCC) 
• R-Value Work:  0.132 (Depositor), 0.145 (DCC) 
• R-Value Observed: 0.134 (Depositor) 

Space Group: P 6₅ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 69.775	α = 90
b = 69.775	β = 90
c = 314.836	γ = 120

Software Package:

Software Name	Purpose
PHENIX	refinement
Aimless	data scaling
XDS	data reduction
PHASER	phasing
PDB_EXTRACT	data extraction

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2025-05-07 
Deposition Author(s): Seattle Structural Genomics Center for Infectious Disease, Seattle Structural Genomics Center for Infectious Disease (SSGCID)

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Funding Organization	Location	Grant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)	United States	75N93022C00036
National Institutes of Health/Office of the Director	United States	S10OD030394

Revision History  

• Version 1.0: 2025-05-07
  Type: Initial release