3IWN	Rna Rna Binding Protein	date	Sep 02, 2009
title	Co-Crystal Structure Of A Bacterial C-Di-Gmp Riboswitch
authors	N.Kulshina, N.J.Baird, A.R.Ferre-D'Amare
compound		source
Molecule: C-Di-Gmp Riboswitch Chain: A, B Engineered: Yes		Synthetic: Yes Other_details: In Vitro Transcription
Molecule: U1 Small Nuclear Ribonucleoprotein A Chain: C, D Fragment: Unp Residues 6-96, Rrm 1 Domain Synonym: U1 Snrnp Protein A, U1a Protein, U1-A Engineered: Yes Mutation: Yes		Organism_scientific: Homo Sapiens Organism_common: Human Organism_taxid: 9606 Gene: Snrpa, U1a Expression_system: Escherichia Coli Expression_system_taxid: 562 Expression_system_strain: Bl21(De3) Expression_system_vector_type: Plasmid Expression_system_plasmid: Pt7
symmetry	Space Group: P 21 21 21	R_factor 0.222 R_Free 0.292
crystal cell	length a length b length c angle alpha angle beta angle gamma 31.800 91.000 280.100 90.00 90.00 90.00
method	X-Ray Diffraction	resolution	3.20 Å
ligand	C2E	enzyme
note	3IWN (Molecule of the Month:pdb130)
Gene Ontology	Chain Function Process Component D, C nucleotide binding nucleic acid binding RNA binding protein binding snRNA binding mRNA splicing, via spliceoso... mRNA processing RNA splicing gene expression nucleus nucleoplasm spliceosomal complex ribonucleoprotein complex
Primary reference	Recognition of the bacterial second messenger cyclic diguanylate by its cognate riboswitch., Kulshina N, Baird NJ, Ferre-D'Amare AR, Nat Struct Mol Biol. 2009 Dec;16(12):1212-7. Epub 2009 Nov 8. PMID:19898478

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (114 Kb) [Save to disk] Biological Unit Coordinates (3iwn.pdb1.gz) 55 Kb Biological Unit Coordinates (3iwn.pdb2.gz) 55 Kb LPC: Ligand-Protein Contacts for 3IWN CSU: Contacts of Structural Units for 3IWN Structure Factors (80 Kb) Retrieve 3IWN in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 3IWN from S2C, [Save to disk] Re-refined 3iwn structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 3IWN 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. On AstexViewer, from MSD-EBI (viewer documentation). On RasMol (Install RasMol freeware) Here's help on how to use RasMol.

Visual 3D analysis of 3IWN

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 3IWN, from MSDmotif at EBI Fold representative 3iwn from FSSP and Dali (Families of Structurally Similar Proteins)

Sequence-derived information

View one-letter amino acid or nucleotide sequence for each chain: [3iwn_A] [3iwn_B] [3iwn_C] [3iwn_D] SWISS-PROT database: [P09012] Domain organization of [SNRPA_HUMAN] by SWISSPFAM Domain found in 3IWN: [RRM ] by SMART Alignments of the sequence of 3IWN with the sequences similar proteins can be viewed for 3IWN's classification [SNRPA_HUMAN] at ProtoMap. Click on "Neighbors List", then on the "See Alignments" button below the list. A sequence distance tree ("phylogenetic tree") can be viewed for 1ACL's classification [SNRPA_HUMAN] at ProtoMap. Click on the Cluster number.

Other resources with information on 3IWN

Community annotation for 3IWN at PDBWiki (http://pdbwiki.org) MMDB (Entrez's Structure Database)

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