Structure of Aes from E. coli in covalent complex with PMS

Experimental Data Snapshot

  • Resolution: 2.30 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.180 

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Structural and mutational analyses of Aes, an inhibitor of MalT in Escherichia coli.

Schiefner, A.Gerber, K.Brosig, A.Boos, W.

(2014) Proteins 82: 268-277

  • DOI: https://doi.org/10.1002/prot.24383
  • Primary Citation of Related Structures:  
    4KRX, 4KRY

  • PubMed Abstract: 

    The acyl esterase Aes effectively inhibits the transcriptional activity of MalT-the central activator of maltose and maltodextrin utilizing genes in Escherichia coli. To provide better insight into the nature of the interaction between Aes and MalT, we determined two different crystal structures of Aes-in its native form and covalently modified by a phenylmethylsulfonyl moiety at its active site serine. Both structures show distinct space groups and were refined to a resolution of 1.8 Å and 2.3 Å, respectively. The overall structure of Aes resembles a canonical α/β-hydrolase fold, which is extended by a funnel-like cap structure that forms the substrate-binding site. The catalytic triad of Aes, comprising residues Ser165, His292, and Asp262, is located at the bottom of this funnel. Analysis of the crystal-packing contacts of the two different space groups as well as analytical size-exclusion chromatography revealed a homodimeric arrangement of Aes. The Aes dimer adopts an antiparallel contact involving both the hydrolase core and the cap, with its twofold axis perpendicular to the largest dimension of Aes. To identify the surface area of Aes that is responsible for the interaction with MalT, we performed a structure-based alanine-scanning mutagenesis to pinpoint Aes residues that are significantly impaired in MalT inhibition, but still exhibit wild-type expression and enzymatic activity. These residues map to a shallow slightly concave surface patch of Aes at the opposite site of the dimerization interface and indicate the surface area that interacts with MalT.

  • Organizational Affiliation

    Lehrstuhl für Biologische Chemie, Technische Universität München, 85350, Freising-Weihenstephan, Germany.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Acetyl esterase
A, B, C, D, E
A, B, C, D, E, F
333Escherichia coli K-12Mutation(s): 0 
Gene Names: aesb0476JW0465ybaC
EC: 3.1.1
Find proteins for P23872 (Escherichia coli (strain K12))
Explore P23872 
Go to UniProtKB:  P23872
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP23872
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on 1PE

Download Ideal Coordinates CCD File 
O [auth D],
S [auth E]
C10 H22 O6
Query on PGE

Download Ideal Coordinates CCD File 
G [auth A]
H [auth A]
J [auth B]
L [auth C]
M [auth D]
G [auth A],
H [auth A],
J [auth B],
L [auth C],
M [auth D],
N [auth D],
R [auth E],
T [auth F]
C6 H14 O4
Query on IMD

Download Ideal Coordinates CCD File 
I [auth A],
K [auth B],
P [auth D],
Q [auth D]
C3 H5 N2
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on SEB
A, B, C, D, E
A, B, C, D, E, F
Experimental Data & Validation

Experimental Data

  • Resolution: 2.30 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.180 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 111.401α = 90
b = 111.401β = 90
c = 282.187γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
PDB_EXTRACTdata extraction
MAR345data collection
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-08-21
    Type: Initial release
  • Version 1.1: 2014-02-05
    Changes: Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description