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 Diffraction	resolution	2.90 Å
Gene Ontology	Chain Function Process Component A, D, C, B
Primary reference	Structures 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

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 3D motif for 2CAX, from MSDmotif at EBI

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)

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