1R23	Transcription Repressor	date	Sep 25, 2003
title	Crystal Structure Of The Cyanobacterial Metallothionein Repr In The Zn1-Form (One Zn(II) Per Dimer)
authors	C.Eicken, M.A.Pennella, X.Chen, K.M.Koshlap, M.L.Vanzile, J.C.Sac D.P.Giedroc
compound		source
Molecule: Transcriptional Repressor Smtb Chain: A, B Engineered: Yes		Organism_scientific: Synechococcus Elongatus Pcc 7942 Organism_taxid: 1140 Strain: Pcc7942 Gene: Smtb Expression_system: Escherichia Coli Bl21(De3) Expression_system_taxid: 469008 Expression_system_strain: Bl21(De3) Expression_system_vector_type: Plasmid
symmetry	Space Group: P 1 21 1	R_factor 0.204 R_Free 0.236
crystal cell	length a length b length c angle alpha angle beta angle gamma 36.996 70.370 42.685 90.00 95.50 90.00
method	X-Ray Diffraction	resolution	2.00 Å
ligand	ZN	enzyme
related structures	by homologous chain: 1R1T, 1SMT
Gene Ontology	Chain Function Process Component A, B
Primary reference	A metal-ligand-mediated intersubunit allosteric switch in related SmtB/ArsR zinc sensor proteins., Eicken C, Pennella MA, Chen X, Koshlap KM, VanZile ML, Sacchettini JC, Giedroc DP, J Mol Biol 2003 Oct 31;333(4):683-95. PMID:14568530

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (39 Kb) [Save to disk] Biological Unit Coordinates (1r23.pdb1.gz) 35 Kb LPC: Ligand-Protein Contacts for 1R23 CSU: Contacts of Structural Units for 1R23 Likely Quarternary Molecular Structure file(s) for 1R23 Retrieve 1R23 in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1R23 from S2C, [Save to disk]

View 1R23 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 1R23

Ramachandran plot from PDBSum

Structure-derived information

Dipole moment, from Dipole Server at Weizmann Institute 3D motif for 1R23, from MSDmotif at EBI Classification of representative domains in scop (Structural Classification of Proteins)     - Domain d1r23a_, region A [Jmol] [rasmolscript] [script source]     - Domain d1r23b_, region B [Jmol] [rasmolscript] [script source] Class (fold), Architecture (subfold), Topology, Homologous superfamily from CATH Summaries and structural analyses of PDB data files from PDBSum Identification of Protein Pockets & Cavities at CASTp

Sequence-derived information

View one-letter amino acid or nucleotide sequence for each chain: [1r23_B] [1r23] [1r23_A] SWISS-PROT database: [P30340] Domain organization of [SMTB_SYNE7] by SWISSPFAM Domain found in 1R23: [HTH_ARSR ] by SMART

Other resources with information on 1R23

Community annotation for 1R23 at PDBWiki (http://pdbwiki.org) MMDB (Entrez's Structure Database)

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