Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 79.15 kDa 
• Atom Count: 5889 
• Residue Count: 674 
• Unique protein chains: 1

1U26

Crystal structure of Selenomonas ruminantium phytase complexed with persulfated phytate

• DOI: 10.2210/pdb1U26/pdb

• Classification: HYDROLASE
• Organism(s): Selenomonas ruminantium
• Expression System: Escherichia coli BL21
• Mutation(s): No 


• Deposited: 2004-07-16 Released: 2004-11-09 
• Deposition Author(s): Chu, H.M., Guo, R.T., Lin, T.W., Chou, C.C., Shr, H.L., Lai, H.L., Tang, T.Y., Cheng, K.J., Selinger, B.L., Wang, A.H.-J.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.260 
• R-Value Work: 0.207 

Literature

Structures of Selenomonas ruminantium Phytase in Complex with Persulfated Phytate; DSP Phytase Fold and Mechanism for Sequential Substrate Hydrolysis

Chu, H.M., Guo, R.T., Lin, T.W., Chou, C.C., Shr, H.L., Lai, H.L., Tang, T.Y., Cheng, K.J., Selinger, B.L., Wang, A.H.-J.

(2004) Structure 12: 2015-2024

• PubMed: 15530366 
• DOI: 10.1016/j.str.2004.08.010
• Primary Citation of Related Structures:  
  1U25, 1U24, 1U26


• PubMed Abstract: 
  

Various inositide phosphatases participate in the regulation of inositol polyphosphate signaling molecules. Plant phytases are phosphatases that hydrolyze phytate to less-phosphorylated myo-inositol derivatives and phosphate. The phytase from Selenomonas ruminantium shares no sequence homology with other microbial phytases. Its crystal structure revealed a phytase fold of the dual-specificity phosphatase type. The active site is located near a conserved cysteine-containing (Cys241) P loop. We also solved two other crystal forms in which an inhibitor, myo-inositol hexasulfate, is cocrystallized with the enzyme. In the "standby" and the "inhibited" crystal forms, the inhibitor is bound, respectively, in a pocket slightly away from Cys241 and at the substrate binding site where the phosphate group to be hydrolyzed is held close to the -SH group of Cys241. Our structural and mutagenesis studies allow us to visualize the way in which the P loop-containing phytase attracts and hydrolyzes the substrate (phytate) sequentially.

---

Organizational Affiliation: 

Institute of Biochemical Sciences, National Taiwan University, Taipei 106, Taiwan.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
myo-inositol hexaphosphate phosphohydrolase	A, B	337	Selenomonas ruminantium	Mutation(s): 0  Gene Names: phyA EC: 3.1.3.72
Find proteins for Q7WUJ1 (Selenomonas ruminantium) Explore Q7WUJ1  Go to UniProtKB:  Q7WUJ1

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IHS	A, B	D-MYO-INOSITOL-HEXASULPHATE C6 H12 O24 S6 NBTMNFYXJYCQHQ-GPIVLXJGSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.260 
• R-Value Work: 0.207 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 161.301	α = 90
b = 101.923	β = 90
c = 46.06	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-07-16 
• Released Date: 2004-11-09 
Deposition Author(s): Chu, H.M., Guo, R.T., Lin, T.W., Chou, C.C., Shr, H.L., Lai, H.L., Tang, T.Y., Cheng, K.J., Selinger, B.L., Wang, A.H.-J.

Revision History 

• Version 1.0: 2004-11-09
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance