1HJK | pdb_00001hjk

ALKALINE PHOSPHATASE MUTANT H331Q

• PDB DOI: https://doi.org/10.2210/pdb1HJK/pdb

• Classification: HYDROLASE
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 1997-05-30 Released: 1997-10-15 
• Deposition Author(s): Murphy, J.E., Stec, B., Ma, L., Kantrowitz, E.R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 
  0.200 (Depositor) 
• R-Value Work: 
  0.177 (Depositor) 
• R-Value Observed: 
  0.177 (Depositor) 

Literature

Trapping and visualization of a covalent enzyme-phosphate intermediate.

Murphy, J.E., Stec, B., Ma, L., Kantrowitz, E.R.

(1997) Nat Struct Biol 4: 618-622

• PubMed: 9253408 
• DOI: https://doi.org/10.1038/nsb0897-618
• Primary Citation Related Structures: 
  1HJK


• PubMed Abstract: 
  

  Using a mutant version of E. coli alkaline phosphatase, we succeeded in trapping and determining the structure of the phospho-enzyme intermediate. The X-ray structure also revealed the catalytic water molecule, bound to one of the active site zinc ions, positioned ideally for the apical attack necessary for the hydrolysis of the intermediate.

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: 94.83 kDa 
• Atom Count: 7,144 
• Modeled Residue Count: 898 
• Deposited Residue Count: 898 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ALKALINE PHOSPHATASE	A, B	449	Escherichia coli	Mutation(s): 2  Gene Names: PHOA EC: 3.1.3.1
UniProt
Find proteins for P00634 (Escherichia coli (strain K12)) Explore P00634  Go to UniProtKB:  P00634

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	F [auth A], J [auth B]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
ZN	C [auth A], D [auth A], G [auth B], H [auth B]	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
MG	E [auth A], I [auth B]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
SEP	A, B	L-PEPTIDE LINKING	C3 H8 N O6 P		SER

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free:  0.200 (Depositor) 
• R-Value Work:  0.177 (Depositor) 
• R-Value Observed: 0.177 (Depositor) 

Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 195.52	α = 90
b = 167.86	β = 90
c = 77.03	γ = 90

Software Package:

Software Name	Purpose
SAN	data collection
X-PLOR	model building
X-PLOR	refinement
SDMS	data reduction
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-10-15 
Deposition Author(s): Murphy, J.E., Stec, B., Ma, L., Kantrowitz, E.R.

Revision History  

• Version 1.0: 1997-10-15
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2011-11-16
  Changes: Atomic model
• Version 1.4: 2021-11-03
  Changes: Database references, Derived calculations, Other
• Version 1.5: 2024-11-13
  Changes: Data collection, Structure summary