2CAX Transcriptional Repressor date Dec 23, 2005
title Structural Basis For Cooperative Binding Of Ribbon-Helix-Hel Repressor Omega To Mutated Direct Dna Heptad Repeats
authors W.A.Weihofen, A.Cicek, F.Pratto, J.C.Alonso, W.Saenger
compound source
Molecule: Orf Omega
Chain: A, B, C, D
Fragment: Ribbon-Helix-Helix Domain, Residues 20-71
Synonym: Orf Omega Transcriptional Repressor
Engineered: Yes
Other_details: 19 N-Terminal Residues Deleted, New N- Termi Residue Met19 Is A Cloning Artefact;
Organism_scientific: Streptococcus Pyogenes
Organism_taxid: 1314
Expression_system: Escherichia Coli
Expression_system_taxid: 511693
Expression_system_strain: Bl21
Expression_system_vector_type: Plasmid
Expression_system_plasmid: Pet28a-Delta19omega
Other_details: Omega Transcriptional Reprsssor Is Encoded B Psm19035 Of The Inc18 Family Of Plasmids.;

Molecule: 5'-D(Gpapaptpcpapcpapapap Tpcpapcp 3';
Chain: G
Engineered: Yes

Synthetic: Yes

Molecule: 5'-D(Tptpgptpgpaptptptpgp Tpgpaptp 3';
Chain: H
Engineered: Yes
Other_details: 17 Base-Pairs And G, C Overhangs, Complement To First Strand;

Synthetic: Yes
Organism_scientific: Synthetic Construct
Organism_taxid: 32630
Other_details: In Inc18 Family Plasmids, Direct Repeats Occ Promoter Regions Preceding Genes Controlled By Omega Transc Repressor;

Molecule: 5'-D(Gpapaptpcpapcpapapgp Tpcpapcpapapgpc)-3';
Chain: U
Engineered: Yes

Synthetic: Yes

Molecule: 5'-D(Cptptpgptpgpapcptptp Gptpgpaptptpcpg)-3';
Chain: Y
Engineered: Yes
Other_details: 18 Base-Pairs With G, C Overhangs. Cognate H D(Aatcaca) Followed By Mutated Heptad D(Agtcaca)

Synthetic: Yes
Organism_scientific: Synthetic Construct
Organism_taxid: 32630
Other_details: In Inc18 Family Plasmids, Direct Repeats Occ Promoter Regions Preceding Genes Controlled By Omega Transc Repressor
symmetry Space Group: C 1 2 1
R_factor 0.208 R_Free 0.247
crystal
cell
length a length b length c angle alpha angle beta angle gamma
219.957 44.655 76.136 90.00 109.26 90.00
method X-Ray Diffractionresolution 2.90 Å
Gene
Ontology
ChainFunctionProcessComponent
A, D, C, B


Primary referenceStructures of omega repressors bound to direct and inverted DNA repeats explain modulation of transcription., Weihofen WA, Cicek A, Pratto F, Alonso JC, Saenger W, Nucleic Acids Res. 2006 Mar 9;34(5):1450-8. Print 2006. PMID:16528102
Data retrieval
  • Asymmetric unit, PDB entry: [header only] [complete with coordinates] (69 Kb) [Save to disk]
  • Biological Unit Coordinates (2cax.pdb1.gz) 62 Kb
  • CSU: Contacts of Structural Units for 2CAX
  • Likely Quarternary Molecular Structure file(s) for 2CAX
  • Structure Factors (197 Kb)
  • Retrieve 2CAX in mmCIF format [Save to disk]
  • SEQRES to COORDINATES correlation for 2CAX from S2C, [Save to disk]
  • Re-refined 2cax structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models
  • View 2CAX 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 2CAX
  • Cartoon representation from PDB Cartoon
  • Ramachandran plot from PDBSum
  • Structure-derived information
  • Electron Density related parameters from EDS Electron Density Server, at Upsala
  • Dipole moment, from Dipole Server at Weizmann Institute
  • Crystal Contacts, from CryCo at Weizmann Institute
  • 3D motif for 2CAX, from MSDmotif at EBI
  • Fold representative 2cax from FSSP and Dali (Families of Structurally Similar Proteins)
  • Sequence-derived information
  • View one-letter amino acid or nucleotide sequence for each chain: [2cax_U] [2cax_Y] [2cax_A] [2cax_C] [2cax] [2cax_G] [2cax_H] [2cax_B] [2cax_D]
  • SWISS-PROT database: [Q57468]
  • Domain organization of [Q57468_STRPY] by SWISSPFAM
  • Other resources with information on 2CAX
  • Community annotation for 2CAX at PDBWiki (http://pdbwiki.org)
  • MMDB (Entrez's Structure Database)
  • Movements, Movies and Images
  • Images from IMB Jena Image Library of Biological Macromolecules.

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