3KRS

Structure of Triosephosphate Isomerase from Cryptosporidium Parvum at 1.55A Resolution

• PDB DOI: https://doi.org/10.2210/pdb3KRS/pdb

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


• Deposited: 2009-11-19 Released: 2009-12-01 
• Deposition Author(s): Seattle Structural Genomics Center for Infectious Disease (SSGCID)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.188 
• R-Value Work: 0.157 
• R-Value Observed: 0.159 

Starting Model: experimental

Literature

Structure of triosephosphate isomerase from Cryptosporidium parvum.

Nguyen, T.N., Abendroth, J., Leibly, D.J., Le, K.P., Guo, W., Kelley, A., Stewart, L., Myler, P.J., Van Voorhis, W.C.

(2011) Acta Crystallogr Sect F Struct Biol Cryst Commun 67: 1095-1099

• PubMed: 21904056 
• DOI: https://doi.org/10.1107/S1744309111019178
• Primary Citation of Related Structures:  
  3KRS


• PubMed Abstract: 
  

  Cryptosporidium parvum is one of several Cryptosporidium spp. that cause the parasitic infection cryptosporidiosis. Cryptosporidiosis is a diarrheal infection that is spread via the fecal-oral route and is commonly caused by contaminated drinking water. Triosephosphate isomerase is an enzyme that is ubiquitous to all organisms that perform glycolysis. Triosephosphate isomerase catalyzes the formation of glyceraldehyde 3-phosphate from dihydroxyacetone phosphate, which is a critical step to ensure the maximum ATP production per glucose molecule. In this paper, the 1.55 Å resolution crystal structure of the open-loop form of triosephosphate isomerase from C. parvum Iowa II is presented. An unidentified electron density was found in the active site.

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Organizational Affiliation: 

Seattle Structural Genomics Center for Infectious Disease (SSGCID), USA.

Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 59.45 kDa 
• Atom Count: 4,772 
• Modelled Residue Count: 498 
• Deposited Residue Count: 542 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Triosephosphate isomerase	A, B	271	Cryptosporidium parvum Iowa II	Mutation(s): 0  Gene Names: cgd1_3040 EC: 5.3.1.1
UniProt
Find proteins for Q5CSE7 (Cryptosporidium parvum (strain Iowa II)) Explore Q5CSE7  Go to UniProtKB:  Q5CSE7

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NA	C [auth A], J [auth B]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N
UNX	D [auth A], E [auth A], F [auth A], G [auth A], H [auth A], I [auth A], K [auth B], L [auth B], M [auth B], N [auth B], O [auth B], P [auth B]	UNKNOWN ATOM OR ION X

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.188 
• R-Value Work: 0.157 
• R-Value Observed: 0.159 
• Space Group: P 1 2₁ 1
• Diffraction Data: https://doi.org/10.18430/M33KRS

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 53.56	α = 90
b = 71.93	β = 106.47
c = 75.83	γ = 90

Software Package:

Software Name	Purpose
BOS	data collection
PHASER	phasing
REFMAC	refinement
XDS	data reduction
XSCALE	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2009-12-01 
Deposition Author(s): Seattle Structural Genomics Center for Infectious Disease (SSGCID)

Revision History  

• Version 1.0: 2009-12-01
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2011-09-21
  Changes: Database references
• Version 1.3: 2023-09-06
  Changes: Data collection, Database references, Derived calculations, Refinement description