1KRV

Galactoside Acetyltransferase in Complex with CoA and PNP-beta-Gal


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.174 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of the lac operon galactoside acetyltransferase.

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

(2002) Structure 10: 581-588

  • Primary Citation of Related Structures:  

  • 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 ...

    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.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GALACTOSIDE O-ACETYLTRANSFERASE
A, B, C
203Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: lacA
EC: 2.3.1.18
Find proteins for P07464 (Escherichia coli (strain K12))
Go to UniProtKB:  P07464
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
147
Query on 147

Download SDF File 
Download CCD File 
A, B, C
1-O-[P-NITROPHENYL]-BETA-D-GALACTOPYRANOSE
C12 H15 N O8
IFBHRQDFSNCLOZ-YBXAARCKSA-N
 Ligand Interaction
COA
Query on COA

Download SDF File 
Download CCD File 
A, B, C
COENZYME A
C21 H36 N7 O16 P3 S
RGJOEKWQDUBAIZ-IBOSZNHHSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.253 
  • R-Value Work: 0.174 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 66.300α = 90.00
b = 183.800β = 90.00
c = 121.500γ = 90.00
Software Package:
Software NamePurpose
X-GENdata reduction
X-PLORrefinement
X-PLORphasing
XDSdata scaling
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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