1MDP

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


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 

wwPDB Validation   3D Report Full Report


This is version 2.0 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

  • DOI: 10.1006/jmbi.1994.0059
  • Primary Citation of Related Structures:  
    1MDQ, 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 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 ...

    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: 
    • 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
    • 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
    • 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

    Organizational Affiliation

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



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
MALTODEXTRIN BINDING PROTEINA [auth 1], B [auth 2]363Escherichia coliMutation(s): 2 
Find proteins for P0AEX9 (Escherichia coli (strain K12))
Explore P0AEX9 
Go to UniProtKB:  P0AEX9
Protein Feature View
Expand
  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
alpha-D-glucopyranose-(1-4)-alpha-D-glucopyranoseC [auth A], D [auth B]2 N/A Oligosaccharides Interaction
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 2
IDChainsNameType/Class2D Diagram3D Interactions
PRD_900001
Query on PRD_900001
C [auth A], D [auth B]alpha-maltoseOligosaccharide /  Nutrient

--

Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.51α = 90
b = 88.33β = 95
c = 75.79γ = 90
Software Package:
Software NamePurpose
X-PLORmodel building
PROLSQrefinement
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1994-11-01
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-07-17
    Changes: Data collection, Other, Refinement description
  • Version 1.4: 2019-08-14
    Changes: Data collection, Refinement description
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Non-polymer description, Structure summary