1SAX

Three-dimensional structure of s.aureus methicillin-resistance regulating transcriptional repressor meci in complex with 25-bp ds-DNA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.216 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

On the transcriptional regulation of methicillin resistance: MecI repressor in complex with its operator

Garcia-Castellanos, R.Mallorqui-Fernandez, G.Marrero, A.Potempa, J.Coll, M.Gomis-Ruth, F.X.

(2004) J Biol Chem 279: 17888-17896

  • DOI: 10.1074/jbc.M313123200
  • Primary Citation of Related Structures:  
    1SAX

  • PubMed Abstract: 
  • Bacterial resistance to antibiotics poses a serious worldwide public health problem due to the high morbidity and mortality caused by infectious diseases. Most hospital-onset infections are associated with methicillin-resistant Staphylococcus aureus (MRSA) strains that have acquired multiple drug resistance to beta-lactam antibiotics ...

    Bacterial resistance to antibiotics poses a serious worldwide public health problem due to the high morbidity and mortality caused by infectious diseases. Most hospital-onset infections are associated with methicillin-resistant Staphylococcus aureus (MRSA) strains that have acquired multiple drug resistance to beta-lactam antibiotics. In a response to antimicrobial stress, nearly all clinical MRSA isolates produce beta-lactamase (BlaZ) and a penicillin-binding protein with low affinity for beta-lactam antibiotics (PBP2a, also known as PBP2' or MecA). Both effectors are regulated by homologous signal transduction systems consisting of a sensor/transducer and a transcriptional repressor. MecI (methicillin repressor) blocks mecA but also blaZ transcription and that of itself and the co-transcribed sensor/transducer. The structure of MecI in complex with a cognate operator double-stranded DNA reveals a homodimeric arrangement with a novel C-terminal spiral staircase dimerization domain responsible for dimer integrity. Each protomer interacts with the DNA major groove through a winged helix DNA-binding domain and specifically recognizes the nucleotide sequence 5'-Gua-Thy-Ade-X-Thy-3'. This results in an unusual convex bending of the DNA helix. The structure of this first molecular determinant of methicillin resistance in complex with its target DNA provides insights into its regulatory mechanism and paves the way for new antimicrobial strategies against MRSA.


    Related Citations: 
    • Three-dimensional structure of MecI. Molecular basis for transcriptional regulation of staphylococcal methicillin resistance
      Garcia-Castellanos, R., Marrero, A., Mallorqui-Fernandez, G., Potempa, J., Coll, M., Gomis-Rueth, F.X.
      (2003) J Biol Chem 278: 39897

    Organizational Affiliation

    Institut de Biologia Molecular de Barcelona, CID-CSIC C/Jordi Girona, 18-26, 08034 Barcelona, Spain.



Macromolecules

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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
Methicillin resistance regulatory protein mecI AB123Staphylococcus aureus subsp. aureus N315Mutation(s): 0 
Gene Names: mecISA0040
Find proteins for P68261 (Staphylococcus aureus (strain N315))
Explore P68261 
Go to UniProtKB:  P68261
Protein Feature View
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  • Reference Sequence
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsLengthOrganismImage
5'-d(GCTCCGATATTACAGTTGTAATTTT)-3'C25N/A
Find similar nucleic acids by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsLengthOrganismImage
5'-d(CAAAATTACAACTGTAATATCGGAG)-3'D25N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
K
Query on K

Download Ideal Coordinates CCD File 
B
POTASSIUM ION
K
NPYPAHLBTDXSSS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.212 
  • R-Value Observed: 0.216 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 133.6α = 90
b = 133.6β = 90
c = 54.7γ = 120
Software Package:
Software NamePurpose
XDSdata scaling
XSCALEdata scaling
AMoREphasing
REFMACrefinement
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-04-27
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance