Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

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

Macromolecule Content

• Total Structure Weight: 183.24 kDa 
• Atom Count: 13014 
• Modelled Residue Count: 1538 
• Deposited Residue Count: 1600 
• Unique protein chains: 1

1KH3

Crystal Structure of Thermus thermophilus HB8 Argininosuccinate Synthetase in complex with inhibitor

• DOI: 10.2210/pdb1KH3/pdb

• Classification: LIGASE
• Organism(s): Thermus thermophilus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2001-11-29 Released: 2003-04-22 
• Deposition Author(s): goto, m., Hirotsu, k., miyahara, i., RIKEN Structural Genomics/Proteomics Initiative (RSGI)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.256 
• R-Value Work: 0.226 

Literature

Structures of Argininosuccinate Synthetase in Enzyme-ATP Substrates and Enzyme-AMP Product Forms: STEREOCHEMISTRY OF THE CATALYTIC REACTION

Goto, M., Omi, R., Miyahara, I., Sugahara, M., Hirotsu, k.

(2003) J Biol Chem 278: 22964-22971

• PubMed: 12684518 
• DOI: 10.1074/jbc.M213198200
• Primary Citation of Related Structures:  
  1J20, 1J21, 1J1Z, 1KH3


• PubMed Abstract: 
  

Argininosuccinate synthetase reversibly catalyzes the ATP-dependent condensation of a citrulline with an aspartate to give argininosuccinate. The structures of the enzyme from Thermus thermophilus HB8 complexed with intact ATP and substrates (citrulline and aspartate) and with AMP and product (argininosuccinate) have been determined at 2.1- and 2.0-A resolution, respectively. The enzyme does not show the ATP-induced domain rotation observed in the enzyme from Escherichia coli. In the enzyme-substrate complex, the reaction sites of ATP and the bound substrates are adjacent and are sufficiently close for the reaction to proceed without the large conformational change at the domain level. The mobility of the triphosphate group in ATP and the side chain of citrulline play an important role in the catalytic action. The protonated amino group of the bound aspartate interacts with the alpha-phosphate of ATP and the ureido group of citrulline, thus stimulating the adenylation of citrulline. The enzyme-product complex explains how the citrullyl-AMP intermediate is bound to the active site. The stereochemistry of the catalysis of the enzyme is clarified on the basis of the structures of tAsS (argininosuccinate synthetase from T. thermophilus HB8) complexes.

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Organizational Affiliation: 

Department of Chemistry, Graduate School of Science, Osaka City University, Osaka 558-8585, Japan.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Argininosuccinate Synthetase	A, B, C, D	400	Thermus thermophilus	Mutation(s): 0  Gene Names: HB8 EC: 6.3.4.5
Find proteins for P59846 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579)) Explore P59846  Go to UniProtKB:  P59846

Small Molecules

Ligands 5 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ANP	A, B, C, D	PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER C10 H17 N6 O12 P3 PVKSNHVPLWYQGJ-KQYNXXCUSA-N
ARG	A	ARGININE C6 H15 N4 O2 ODKSFYDXXFIFQN-BYPYZUCNSA-O
ASP	A	ASPARTIC ACID C4 H7 N O4 CKLJMWTZIZZHCS-REOHCLBHSA-N
SO4	A, B, C, D	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
MG	A, B, C, D	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.15 Å
• R-Value Free: 0.256 
• R-Value Work: 0.226 
• Space Group: H 3

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 229.1	α = 90
b = 229.1	β = 90
c = 160.6	γ = 120

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-11-29 
• Released Date: 2003-04-22 
Deposition Author(s): goto, m., Hirotsu, k., miyahara, i., RIKEN Structural Genomics/Proteomics Initiative (RSGI)

Revision History  

• Version 1.0: 2003-04-22
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance