2XDI

Tryptophan repressor with L75F mutation in its apo form (no L- tryptophan bound)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 40 
  • Conformers Submitted: 20 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Three-Dimensional Solution NMR Structure of Apo-L75F-Trpr, a Temperature-Sensitive Mutant of the Tryptophan Repressor Protein.

Tyler, R.Pelczer, I.Carey, J.Copie, V.

(2002) Biochemistry 41: 11954


  • PubMed Abstract: 
  • L75F-TrpR is a temperature-sensitive mutant of the tryptophan repressor protein of Escherichia coli in which surface-exposed residue leucine 75 in the DNA binding domain is replaced with phenylalanine. Biochemical and biophysical studies had suggeste ...

    L75F-TrpR is a temperature-sensitive mutant of the tryptophan repressor protein of Escherichia coli in which surface-exposed residue leucine 75 in the DNA binding domain is replaced with phenylalanine. Biochemical and biophysical studies had suggested global alterations in dynamics for L75F-TrpR, although the structure was apparently similar to that of wild-type TrpR. Herein, we report the three-dimensional solution structure of apo-L75F-TrpR determined by multidimensional ((1)H, (15)N, and (13)C) solution NMR spectroscopy. An ensemble of structures was generated from 769 unique NOE-based distance restraints, 68 dihedral angle restraints, and 62 hydrogen bond distance restraints. Apo-L75F-TrpR exhibits a three-dimensional (3D) fold very similar to that of apo-WT-TrpR, with a dimeric core of four alpha-helices (A-C and F) from each subunit, and less well-defined D and E helical regions of the DNA binding domains. Despite their many similarities, wild-type and mutant proteins display significant chemical shift differences, one cluster of which is in the B-C turn, too distant to be ascribed solely to ring current effects from Phe75. Differences in NOE patterns and amide proton exchange rates are also observed in the B-C turn region. The data provide evidence that this point mutation exerts local effects on structure and stability in the DNA binding domain, and propagates long-range effects through the tertiary structure.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, Montana State University, 108 Gaines Hall, Bozeman, MT 59717, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRP OPERON REPRESSOR
A, B
107Escherichia coli O157:H7Mutation(s): 1 
Gene Names: trpR
Find proteins for P0A882 (Escherichia coli O157:H7)
Go to UniProtKB:  P0A882
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 40 
  • Conformers Submitted: 20 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2010-05-03 
  • Released Date: 2010-07-07 
  • Deposition Author(s): Tyler, R., Copie, V.

Revision History 

  • Version 1.0: 2010-07-07
    Type: Initial release
  • Version 1.1: 2013-06-19
    Type: Atomic model, Database references, Other, Version format compliance