4KN7

X-ray crystal structure of the Escherichia coli RNA polymerase in complex with Benzoxazinorifamycin-2c


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.686 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.252 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

X-ray Crystal Structures of the Escherichia coli RNA Polymerase in Complex with Benzoxazinorifamycins.

Molodtsov, V.Nawarathne, I.N.Scharf, N.T.Kirchhoff, P.D.Showalter, H.D.Garcia, G.A.Murakami, K.S.

(2013) J.Med.Chem. 56: 4758-4763

  • DOI: 10.1021/jm4004889
  • Primary Citation of Related Structures:  4KMU, 4KN4

  • PubMed Abstract: 
  • Rifampin, a semisynthetic rifamycin, is the cornerstone of current tuberculosis treatment. Among many semisynthetic rifamycins, benzoxazinorifamycins have great potential for TB treatment due to their superior affinity for wild-type and rifampin-resi ...

    Rifampin, a semisynthetic rifamycin, is the cornerstone of current tuberculosis treatment. Among many semisynthetic rifamycins, benzoxazinorifamycins have great potential for TB treatment due to their superior affinity for wild-type and rifampin-resistant Mycobacterium tuberculosis RNA polymerases and their reduced hepatic Cyp450 induction activity. In this study, we have determined the crystal structures of the Escherichia coli RNA polymerase complexes with two benzoxazinorifamycins. The ansa-naphthalene moieties of the benzoxazinorifamycins bind in a deep pocket of the β subunit, blocking the path of the RNA transcript. The C3'-tail of benzoxazinorifamycin fits a cavity between the β subunit and σ factor. We propose that in addition to blocking RNA exit, the benzoxazinorifamycin C3'-tail changes the σ region 3.2 loop position, which influences the template DNA at the active site, thereby reducing the efficiency of transcription initiation. This study supports expansion of structure-activity relationships of benzoxazinorifamycins inhibition of RNA polymerase toward uncovering superior analogues with development potential.


    Organizational Affiliation

    Department of Biochemistry and Molecular Biology, The Center for RNA Molecular Biology, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA-directed RNA polymerase subunit alpha
A, B, F, G
329Escherichia coli (strain K12)Gene Names: rpoA (pez, phs, sez)
EC: 2.7.7.6
Find proteins for P0A7Z4 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A7Z4
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
DNA-directed RNA polymerase subunit beta
C, H
1342Escherichia coli (strain K12)Gene Names: rpoB (groN, nitB, rif, ron, stl, stv, tabD)
EC: 2.7.7.6
Find proteins for P0A8V2 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A8V2
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
DNA-directed RNA polymerase subunit beta'
D, I
1407Escherichia coli (strain K12)Gene Names: rpoC (tabB)
EC: 2.7.7.6
Find proteins for P0A8T7 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A8T7
Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
DNA-directed RNA polymerase subunit omega
E, J
91Escherichia coli (strain K12)Gene Names: rpoZ
EC: 2.7.7.6
Find proteins for P0A800 (Escherichia coli (strain K12))
Go to UniProtKB:  P0A800
Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
RNA polymerase sigma factor RpoD
X, Y
613Escherichia coli (strain K12)Gene Names: rpoD (alt)
Find proteins for P00579 (Escherichia coli (strain K12))
Go to UniProtKB:  P00579
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
1RM
Query on 1RM

Download SDF File 
Download CCD File 
C, H
Benzoxazinorifamycin-2c
C56 H70 N6 O13
BWDTVIVNIJMQGS-DORLTJSWSA-N
 Ligand Interaction
ZN
Query on ZN

Download SDF File 
Download CCD File 
D, I
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
D, I
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
External Ligand Annotations 
IDBinding Affinity (Sequence Identity %)
1RMIC50: 24 nM PDBBIND
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.686 Å
  • R-Value Free: 0.309 
  • R-Value Work: 0.252 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 185.830α = 90.00
b = 204.579β = 90.00
c = 308.701γ = 90.00
Software Package:
Software NamePurpose
HKL-2000data reduction
PHENIXrefinement
PHENIXmodel building
PHENIXphasing
HKL-2000data collection
HKL-2000data scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2013-05-08 
  • Released Date: 2013-05-22 
  • Deposition Author(s): Murakami, K.S.

Revision History 

  • Version 1.0: 2013-05-22
    Type: Initial release
  • Version 1.1: 2013-05-29
    Type: Database references
  • Version 1.2: 2013-07-03
    Type: Database references