Biological Assembly 1  

 3D View: Structure

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 101.33 kDa 
• Atom Count: 885 
• Modelled Residue Count: 885 
• Deposited Residue Count: 900 
• Unique protein chains: 1

2AT2

MOLECULAR STRUCTURE OF BACILLUS SUBTILIS ASPARTATE TRANSCARBAMOYLASE AT 3.0 ANGSTROMS RESOLUTION

• DOI: 10.2210/pdb2AT2/pdb

• Classification: TRANSFERASE
• Organism(s): Bacillus subtilis
• Mutation(s): No 


• Deposited: 1992-07-20 Released: 1994-01-31 
• Deposition Author(s): Stevens, R.C., Reinisch, K.M., Lipscomb, W.N.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Work: 0.190 
• R-Value Observed: 0.190 

Literature

Molecular structure of Bacillus subtilis aspartate transcarbamoylase at 3.0 A resolution.

Stevens, R.C., Reinisch, K.M., Lipscomb, W.N.

(1991) Proc Natl Acad Sci U S A 88: 6087-6091

• PubMed: 1906175 
• DOI: 10.1073/pnas.88.14.6087
• Primary Citation of Related Structures:  
  2AT2


• PubMed Abstract: 
  

The three-dimensional structure of Bacillus subtilis aspartate transcarbamoylase (ATCase; aspartate carbamoyltransferase; carbamoyl-phosphate:L-aspartate carbamoyltransferase, EC 2.1.3.2) has been solved by the molecular replacement method at 3.0 A resolution and refined to a crystallographic R factor of 0.19. The enzyme crystallizes in the space group C2 with unit cell dimensions a = 258.5, b = 153.2, and c = 51.9 A and beta = 97.7 degrees. The asymmetric unit is composed of three monomers related by noncrystallographic threefold symmetry. A total of 295 of 304 amino acid residues have been built into the monomer. The last 9 residues in the C terminus were not included in the final model. Each monomer consists of 34% alpha-helix and 18% beta-strand. Three solvent-exposed loop regions (residues 69-84, 178-191, and 212-229) are not well defined in terms of electron density. The catalytic trimer of ATCase from B. subtilis shows great similarity to the catalytic trimer in Escherichia coli ATCase, which was used in constructing the model for molecular replacement. The unliganded trimer from B. subtilis, which is not cooperative, resembles the T (inactive) state slightly more than the R (active)-state form of the E. coli trimer. However, certain regions in the B. subtilis trimer exhibit shifts toward the E. coli R-state conformation.

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Organizational Affiliation: 

Gibbs Chemical Laboratory, Harvard University, Cambridge, MA 02138.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
ASPARTATE CARBAMOYLTRANSFERASE	A, B, C	300	Bacillus subtilis	Mutation(s): 0  EC: 2.1.3.2
Find proteins for P05654 (Bacillus subtilis (strain 168)) Explore P05654  Go to UniProtKB:  P05654

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Work: 0.190 
• R-Value Observed: 0.190 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 258.5	α = 90
b = 153.2	β = 97.7
c = 51.9	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1992-07-20 
• Released Date: 1994-01-31 
Deposition Author(s): Stevens, R.C., Reinisch, K.M., Lipscomb, W.N.

Revision History  

• Version 1.0: 1994-01-31
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance