1BLE

PHOSPHOENOLPYRUVATE-DEPENDENT PHOSPHOTRANSFERASE SYSTEM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the IIB subunit of a fructose permease (IIBLev) from Bacillus subtilis.

Schauder, S.Nunn, R.S.Lanz, R.Erni, B.Schirmer, T.

(1998) J.Mol.Biol. 276: 591-602

  • DOI: 10.1006/jmbi.1997.1544

  • PubMed Abstract: 
  • The bacterial phosphoenolpyruvate-dependent phosphotransferase system (PTS) mediates both the uptake of carbohydrates across the cytoplasmic membrane and their phosphorylation. During this process, a phosphoryl group is transferred from phosphoenolpy ...

    The bacterial phosphoenolpyruvate-dependent phosphotransferase system (PTS) mediates both the uptake of carbohydrates across the cytoplasmic membrane and their phosphorylation. During this process, a phosphoryl group is transferred from phosphoenolpyruvate via the general PTS proteins enzyme I, HPr and the sugar-specific components IIA, IIB to the transported sugar. The crystal structure of the IIB subunit of a fructose transporter from Bacillus subtilis (IIBLev) was solved by MIRAS to a resolution of 2.9 A. IIBLev comprises 163 amino acid residues that are folded into an open, mainly parallel beta-sheet with helices packed on either face. The phosphorylation site (His15) is located on the first loop (1/A) at one of the topological switch-points of the fold. Despite different global folds, IIBLev and HPr have very similar active-site loop conformations with the active-site histidine residues located close to the N terminus of the first helix. This resemblance may be of functional importance, since both proteins exchange a phosphoryl group with the same IIA subunit. The structural basis of phosphoryl transfer from HPr to IIAMan to IIBMan was investigated by modeling of the respective transition state complexes using the known HPr and IIAMan structures and a homology model of IIBMan that was derived from the IIBLev structure. All three proteins contain a helix that appears to be suitable for stabilization of the phospho-histidine by dipole and H-bonding interactions. Smooth phosphoryl transfer from one N-cap position to the other appears feasible with a minimized transition state energy due to simultaneous interactions with the donor and the acceptor helix.


    Related Citations: 
    • Levanase Operon of Bacillus Subtilis Includes a Fructose-Specific Phosphotransferase System Regulating the Expression of the Operon
      Martin-Verstraete, I.,Debarbouille, M.,Klier, A.,Rapoport, G.
      (1990) J.Mol.Biol. 214: 657


    Organizational Affiliation

    Department of Structural Biology, University of Basel, Switzerland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
FRUCTOSE PERMEASE
A
163Bacillus subtilis (strain 168)Gene Names: levE (sacL)
EC: 2.7.1.194, 2.7.1.191, 2.7.1.192, 2.7.1.195, 2.7.1.193
Find proteins for P26380 (Bacillus subtilis (strain 168))
Go to UniProtKB:  P26380
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.185 
  • Space Group: P 43 3 2
Unit Cell:
Length (Å)Angle (°)
a = 106.900α = 90.00
b = 106.900β = 90.00
c = 106.900γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing
CCP4data scaling
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-09-17
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance