Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 30.2 kDa 
• Atom Count: 2,145 
• Modelled Residue Count: 268 
• Deposited Residue Count: 280 
• Unique protein chains: 1

 1PSU

Structure of the E. coli PaaI protein from the phyenylacetic acid degradation operon

• PDB DOI:  https://doi.org/10.2210/pdb1PSU/pdb

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


• Deposited: 2003-06-21 Released: 2003-07-08 
• Deposition Author(s): Kniewel, R., Buglino, J., Solorzano, V., Wu, J., Lima, C.D., Burley, S.K., New York SGX Research Center for Structural Genomics (NYSGXRC)

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.251 
• R-Value Work: 0.220 
• R-Value Observed: 0.220 

Literature

Structure, function, and mechanism of the phenylacetate pathway hot dog-fold thioesterase PaaI.

Song, F., Zhuang, Z., Finci, L., Dunaway-Mariano, D., Kniewel, R., Buglino, J.A., Solorzano, V., Wu, J., Lima, C.D.

(2006) J Biol Chem 281: 11028-11038

• PubMed: 16464851 
• DOI: https://doi.org/10.1074/jbc.M513896200
• Primary Citation of Related Structures:  
  1PSU, 2FS2


• PubMed Abstract: 
  

The structure and biochemical function of the hot dog-fold thioesterase PaaI operative in the aerobic phenylacetate degradation pathway are examined. PaaI showed modest activity with phenylacetyl-coenzyme A, suggestive of a role in coenzyme A release from this pathway intermediate in the event of limiting downstream pathway enzymes. Minimal activity was observed with aliphatic acyl-coenzyme A thioesters, which ruled out PaaI function in the lower phenylacetate pathway. PaaI was most active with ring-hydroxylated phenylacetyl-coenzyme A thioesters. The x-ray crystal structure of the Escherichia coli thioesterase is reported and analyzed to define the structural basis of substrate recognition and catalysis. The contributions of catalytic and substrate binding residues, thus, identified were examined through steady-state kinetic analysis of site-directed mutant proteins.

---

Organizational Affiliation: 

Department of Chemistry, University of New Mexico, Albuquerque, New Mexico 87131, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Phenylacetic acid degradation protein PaaI	A, B	140	Escherichia coli	Mutation(s): 5  Gene Names: paaI EC: 3.1.2
UniProt
Find proteins for P76084 (Escherichia coli (strain K12)) Explore P76084  Go to UniProtKB:  P76084

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A, B	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.251 
• R-Value Work: 0.220 
• R-Value Observed: 0.220 
• Space Group: P 3₁ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 69.847	α = 90
b = 69.847	β = 90
c = 117.168	γ = 120

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SOLVE	phasing
RESOLVE	model building
CNS	refinement
RESOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2003-07-08 
Deposition Author(s): Kniewel, R., Buglino, J., Solorzano, V., Wu, J., Lima, C.D., Burley, S.K., New York SGX Research Center for Structural Genomics (NYSGXRC)

Revision History  

• Version 1.0: 2003-07-08
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2013-11-13
  Changes: Database references
• Version 1.4: 2021-02-03
  Changes: Database references, Derived calculations, Structure summary