1MDQ

REFINED STRUCTURES OF TWO INSERTION(SLASH)DELETION MUTANTS PROBE FUNCTION OF THE MALTODEXTRIN BINDING PROTEIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Refined structures of two insertion/deletion mutants probe function of the maltodextrin binding protein.

Sharff, A.J.Rodseth, L.E.Szmelcman, S.Hofnung, M.Quiocho, F.A.

(1995) J.Mol.Biol. 246: 8-13

  • Primary Citation of Related Structures:  1MDP

  • PubMed Abstract: 
  • The X-ray structures of the maltose bound forms of two insertion/deletion mutants of the Escherichia coli maltodextrin binding protein, MalE322 and MalE178, have been determined and refined. MalE322 involves a one residue deletion, two residue insert ...

    The X-ray structures of the maltose bound forms of two insertion/deletion mutants of the Escherichia coli maltodextrin binding protein, MalE322 and MalE178, have been determined and refined. MalE322 involves a one residue deletion, two residue insertion in a hinge segment connecting the two (N and C) domains of the protein, an area already identified as being critical for the correct functioning of the protein. MalE178 involves a nine residue deletion and two residue insertion in a helix at the periphery of the C-domain. The function of both mutant proteins is similar to the wild-type, although MalE322 increases the ability to transport maltose and maltodextrin whilst inhibiting the ability of the cell to grow on dextrins. Both proteins exhibit very localized and conservative conformational changes due to their mutations. The structure of MalE322 shows some deformation of the third hinge strand, indicating the likely cause of change in its biochemistry. MalE178 is stable and its activity virtually unchanged from the wild-type. This is most likely due to the long distance of the mutation from the binding site and conservation of the number of interactions between the area around the deletion site and the main body of the protein.


    Related Citations: 
    • Silent and Functional Changes in the Periplasmic Maltose-Binding Protein of Escherichia Coli K12. I. Transport of Maltose
      Duplay, P.,Szmelcman, S.,Bedouelle, H.,Hofnung, M.
      (1987) J.Mol.Biol. 194: 663
    • The 2.3 Angstroms Resolution Structure of the Maltose-or Maltodextrin-Binding Protein, a Primary Receptor of Bacterial Active Transport and Chemotaxis
      Spurlino, J.C.,Lu, G.-Y.,Quiocho, F.A.
      (1991) J.Biol.Chem. 266: 5202
    • Silent and Functional Changes in the Periplasmic Maltose-Binding Protein of Escherichia Coli K12. II. Chemotaxis Towards Maltose
      Duplay, P.,Szmelcman, S.
      (1987) J.Mol.Biol. 194: 675
    • Crystallographic Evidence of a Large Ligand-Induced Hinge-Twist Motion between the Two Domains of the Maltodextrin Binding Protein Involved in Transport and Chemotaxis
      Sharff, A.J.,Rodseth, L.E.,Spurlino, J.C.,Quiocho, F.A.
      (1992) Biochemistry 31: 10657
    • Refined 1.8 Angstroms Structure Reveals the Mode of Binding of Beta-Cyclodextrin to the Maltodextrin Binding Protein
      Sharff, A.J.,Rodseth, L.E.,Quiocho, F.A.
      (1993) Biochemistry 32: 10553


    Organizational Affiliation

    Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
MALTODEXTRIN BINDING PROTEIN
A
371Escherichia coli (strain K12)Gene Names: malE
Find proteins for P0AEX9 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AEX9
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MAL
Query on MAL

Download SDF File 
Download CCD File 
A
MALTOSE
C12 H22 O11
GUBGYTABKSRVRQ-ASMJPISFSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Work: 0.220 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 106.010α = 90.00
b = 66.460β = 113.17
c = 57.750γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement
X-PLORrefinement
X-PLORmodel building
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1994-11-01
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance