4KRY

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.180 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

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: 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 ...

    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.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Acetyl esteraseA, B, C, D, E, F333Escherichia coli K-12Mutation(s): 0 
Gene Names: aesb0476JW0465ybaC
EC: 3.1.1
UniProt
Find proteins for P23872 (Escherichia coli (strain K12))
Explore P23872 
Go to UniProtKB:  P23872
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1PE
Query on 1PE

Download Ideal Coordinates CCD File 
O [auth D], S [auth E]PENTAETHYLENE GLYCOL
C10 H22 O6
JLFNLZLINWHATN-UHFFFAOYSA-N
 Ligand Interaction
PGE
Query on PGE

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

Download Ideal Coordinates CCD File 
I [auth A], K [auth B], P [auth D], Q [auth D]IMIDAZOLE
C3 H5 N2
RAXXELZNTBOGNW-UHFFFAOYSA-O
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
SEB
Query on SEB
A, B, C, D, E, FL-PEPTIDE LINKINGC10 H13 N O5 SSER
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • 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
REFMACrefinement
PDB_EXTRACTdata extraction
MAR345data collection
XDSdata reduction
PHASERphasing

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