Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 70.91 kDa 
• Atom Count: 4979 
• Modelled Residue Count: 600 
• Deposited Residue Count: 609 
• Unique protein chains: 1

1KRR

Galactoside Acetyltransferase in Complex with Acetyl-Coenzyme A

• PDB DOI: 10.2210/pdb1KRR/pdb

• Classification: TRANSFERASE
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2002-01-10 Released: 2002-04-10 
• Deposition Author(s): Wang, X.-G., Olsen, L.R., Roderick, S.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.248 
• R-Value Work: 0.193 
• R-Value Observed: 0.196 

Literature

Structure of the lac operon galactoside acetyltransferase.

Wang, X.G., Olsen, L.R., Roderick, S.L.

(2002) Structure 10: 581-588

• PubMed: 11937062 
• DOI: 10.1016/s0969-2126(02)00741-4
• Primary Citation of Related Structures:  
  1KQA, 1KRR, 1KRU, 1KRV


• PubMed Abstract: 
  

The galactoside acetyltransferase (thiogalactoside transacetylase) of Escherichia coli (GAT, LacA, EC 2.3.1.18) is a gene product of the classical lac operon. GAT may assist cellular detoxification by acetylating nonmetabolizable pyranosides, thereby preventing their reentry into the cell. The structure of GAT has been solved in binary complexes with acetyl-CoA or CoA and in ternary complexes with CoA and the nonphysiological acceptor substrates isopropyl beta-D-thiogalactoside (IPTG) or p-nitrophenyl beta-D-galactopyranoside (PNPbetaGal). A hydrophobic cleft that binds the thioisopropyl and p-nitrophenyl aglycones of IPTG and PNPbetaGal may discriminate against substrates with hydrophilic substituents at this position, such as lactose, or inducers of the lac operon. An extended loop projecting from the left-handed parallel beta helix domain contributes His115, which is in position to facilitate attack of the C6-hydroxyl group of the substrate on the thioester.

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Organizational Affiliation: 

Department of Biochemistry, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Bronx, NY 10461, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
GALACTOSIDE O-ACETYLTRANSFERASE	A, B, C	203	Escherichia coli	Mutation(s): 0  Gene Names: lacA EC: 2.3.1.18
UniProt
Find proteins for P07464 (Escherichia coli (strain K12)) Explore P07464  Go to UniProtKB:  P07464

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ACO	D [auth A], E [auth B], F [auth C]	ACETYL COENZYME *A C23 H38 N7 O17 P3 S ZSLZBFCDCINBPY-ZSJPKINUSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.248 
• R-Value Work: 0.193 
• R-Value Observed: 0.196 
• Space Group: C 2 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 65.7	α = 90
b = 182.5	β = 90
c = 121.2	γ = 90

Software Package:

Software Name	Purpose
SHARP	phasing
X-PLOR	refinement
X-GEN	data reduction
XDS	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-01-10 
• Released Date: 2002-04-10 
Deposition Author(s): Wang, X.-G., Olsen, L.R., Roderick, S.L.

Revision History  

• Version 1.0: 2002-04-10
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-10-11
  Changes: Refinement description