2N5G

NMR structure of KorA, a plasmid-encoded, global transcription regulator KorA


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Flexibility of KorA, a plasmid-encoded, global transcription regulator, in the presence and the absence of its operator.

Rajasekar, K.V.Lovering, A.L.Dancea, F.Scott, D.J.Harris, S.A.Bingle, L.E.Roessle, M.Thomas, C.M.Hyde, E.I.White, S.A.

(2016) Nucleic Acids Res. 44: 4947-4956

  • DOI: 10.1093/nar/gkw191
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The IncP (Incompatibility group P) plasmids are important carriers in the spread of antibiotic resistance across Gram-negative bacteria. Gene expression in the IncP-1 plasmids is stringently controlled by a network of four global repressors, KorA, Ko ...

    The IncP (Incompatibility group P) plasmids are important carriers in the spread of antibiotic resistance across Gram-negative bacteria. Gene expression in the IncP-1 plasmids is stringently controlled by a network of four global repressors, KorA, KorB, TrbA and KorC interacting cooperatively. Intriguingly, KorA and KorB can act as co-repressors at varying distances between their operators, even when they are moved to be on opposite sides of the DNA. KorA is a homodimer with the 101-amino acid subunits, folding into an N-terminal DNA-binding domain and a C-terminal dimerization domain. In this study, we have determined the structures of the free KorA repressor and two complexes each bound to a 20-bp palindromic DNA duplex containing its consensus operator sequence. Using a combination of X-ray crystallography, nuclear magnetic resonance spectroscopy, SAXS and molecular dynamics calculations, we show that the linker between the two domains is very flexible and the protein remains highly mobile in the presence of DNA. This flexibility allows the DNA-binding domains of the dimer to straddle the operator DNA on binding and is likely to be important in cooperative binding to KorB. Unexpectedly, the C-terminal domain of KorA is structurally similar to the dimerization domain of the tumour suppressor p53.


    Organizational Affiliation

    School of Biosciences, The University of Birmingham, Edgbaston, Birmingham B15 2TT, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TrfB transcriptional repressor protein
A, B
101Escherichia coliMutation(s): 0 
Gene Names: trfB (korA)
Find proteins for P03052 (Escherichia coli)
Go to UniProtKB:  P03052
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-07-20
    Type: Initial release