1ZZN	Structural Protein Rna	date	Jun 14, 2005
title	Crystal Structure Of A Group I Introntwo Exon Complex That Includes All Catalytic Metal Ion Ligands.
authors	M.R.Stahley, S.A.Strobel
compound		source
Molecule: 197-Mer Chain: B Engineered: Yes Other_details: Group I Intron		Synthetic: Yes Other_details: Rna Was Is Transcribed By T7 Rna Polymerase. Sequence From Azoarcus Group I Intron;
Molecule: 5'- R(Apapgpcpcpapcpapcpapapapcpcpapgpapcpgp Gpcpc)-3'; Chain: C Engineered: Yes Other_details: Group I Intron, 3'-Exon		Synthetic: Yes Other_details: Solid Phase Sythesis. Sequence From Azoarcus Intron And Exon Sequence.;
Molecule: 5'-R(Cpap(5mu))-3' Chain: D Engineered: Yes Other_details: 5'-Exon, U-1deoxy5mu		Synthetic: Yes Other_details: Solid Phase Synthesis. Sequence From Azoarcus Group I Intron 5'-Exon Sequence.;
Molecule: U1 Small Nuclear Ribonucleoprotein A Rna Binding Domain; Chain: A Fragment: Rrm 1 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 Expression_system: Escherichia Coli Bl21(De3) Expression_system_taxid: 469008 Expression_system_strain: Bl21(De3) Expression_system_vector_type: Plasmid Expression_system_plasmid: Pet11
symmetry	Space Group: P 41 2 2	R_factor 0.269 R_Free 0.307
crystal cell	length a length b length c angle alpha angle beta angle gamma 108.466 108.466 246.400 90.00 90.00 90.00
method	X-Ray Diffraction	resolution	3.37 Å
ligand	5MU, A23, GTP, K, MG	enzyme
Gene Ontology	Chain Function Process Component A 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	Structural evidence for a two-metal-ion mechanism of group I intron splicing., Stahley MR, Strobel SA, Science 2005 Sep 2;309(5740):1587-90. PMID:16141079

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (120 Kb) [Save to disk] Biological Unit Coordinates (1zzn.pdb1.gz) 114 Kb LPC: Ligand-Protein Contacts for 1ZZN CSU: Contacts of Structural Units for 1ZZN Likely Quarternary Molecular Structure file(s) for 1ZZN Structure Factors (172 Kb) Retrieve 1ZZN in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1ZZN from S2C, [Save to disk] Re-refined 1zzn structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 1ZZN 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 1ZZN

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 1ZZN, from MSDmotif at EBI Fold representative 1zzn from FSSP and Dali (Families of Structurally Similar Proteins)

Sequence-derived information

View one-letter amino acid or nucleotide sequence for each chain: [1zzn_A] [1zzn_B] [1zzn_C] [1zzn_D] SWISS-PROT database: [P09012] Domain organization of [SNRPA_HUMAN] by SWISSPFAM Domain found in 1ZZN: [RRM ] by SMART Alignments of the sequence of 1ZZN with the sequences similar proteins can be viewed for 1ZZN'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 1ZZN

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

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