4X8K Transcription Activator date Dec 10, 2014
title Mycobacterium Tuberculosis Rbpa-Sid In Complex With Sigmaa D
authors E.A.Hubin, J.E.Flack, A.Tabib-Salazar, M.S.Paget, S.A.Darst, E.A.
compound source
Molecule: Rna Polymerase Sigma Factor Siga
Chain: A
Fragment: Domain 2 (Unp Residues 236-364)
Synonym: Sigma-A
Engineered: Yes
Organism_scientific: Mycobacterium Tuberculosis
Organism_taxid: 1773
Gene: Siga, Mysa, Rpod, Rpov, Mt2777
Expression_system: Escherichia Coli
Expression_system_taxid: 562

Molecule: Rna Polymerase-Binding Protein Rbpa
Chain: B
Engineered: Yes

Organism_scientific: Mycobacterium Tuberculosis
Organism_taxid: 1773
Gene: Rbpa, Mt2110
Expression_system: Escherichia Coli
Expression_system_taxid: 562
symmetry Space Group: P 31 2 1
R_factor 0.195 R_Free 0.231
length a length b length c angle alpha angle beta angle gamma
84.459 84.459 73.701 90.00 90.00 120.00
method X-Ray Diffractionresolution 2.20 Å
ligand EDO, SO4 enzyme


Primary referenceStructural, functional, and genetic analyses of the actinobacterial transcription factor RbpA., Hubin EA, Tabib-Salazar A, Humphrey LJ, Flack JE, Olinares PD, Darst SA, Campbell EA, Paget MS, Proc Natl Acad Sci U S A. 2015 Jun 9;112(23):7171-6. doi:, 10.1073/pnas.1504942112. Epub 2015 May 26. PMID:26040003
Data retrieval
  • Asymmetric unit, PDB entry: [header only] [complete with coordinates] (32 Kb) [Save to disk]
  • Biological Unit Coordinates (4x8k.pdb1.gz) 28 Kb
  • LPC: Ligand-Protein Contacts for 4X8K
  • CSU: Contacts of Structural Units for 4X8K
  • Structure Factors (251 Kb)
  • Retrieve 4X8K in mmCIF format [Save to disk]
  • SEQRES to COORDINATES correlation for 4X8K from S2C, [Save to disk]
  • Re-refined 4x8k structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models
  • View 4X8K in 3D
  • Proteopedia, because life has more than 2D.
  • On Jmol, a nice Rasmol like molecule viewer. This is good for easiest viewing of basic structure.
  • On FirstGlance, an excellent tool for a guided tour on the structure components, by E. Martz.
  • Visual 3D analysis of 4X8K
  • Cartoon representation from PDB Cartoon
  • Ramachandran plot from PDBSum
  • Structure-derived information
  • Dipole moment, from Dipole Server at Weizmann Institute
  • Crystal Contacts, from CryCo at Weizmann Institute
  • 3D motif for 4X8K, from MSDmotif at EBI
  • Fold representative 4x8k from FSSP and Dali (Families of Structurally Similar Proteins)
  • Sequence-derived information
  • View one-letter amino acid or nucleotide sequence for each chain: [4x8k] [4x8k_A] [4x8k_B]
  • SWISS-PROT database:
  • Domain organization of by SWISSPFAM
  • Other resources with information on 4X8K
  • Community annotation for 4X8K at PDBWiki (http://pdbwiki.org)

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