2X44	Immune System	date	Jan 28, 2010
title	Structure Of A Strand-Swapped Dimeric Form Of Ctla-4
authors	A.F.P.Sonnen, C.Yu, E.J.Evans, D.I.Stuart, S.J.Davis, R.J.C.Gil
compound		source
Molecule: Cytotoxic T-Lymphocyte Protein 4 Chain: D Fragment: Residues 36-161 Synonym: Cytotoxic T-Lymphocyte-Associated Antigen 4, Ctla- Cd152, Cytotoxic T-Lymphocyte Antigen 4; Engineered: Yes Mutation: Yes		Organism_scientific: Homo Sapiens Organism_common: Human Organism_taxid: 9606 Cell_line: Jurkat Tissue: Blood Cell: T-Lymphocyte Expression_system: Escherichia Coli Expression_system_taxid: 469008 Expression_system_strain: Bl21(De3) Other_details: Cdna Generated Directly From Jurkat Cells, C And Mutated Cys122ser.
symmetry	Space Group: P 31 2 1	R_factor 0.19157 R_Free 0.24501
crystal cell	length a length b length c angle alpha angle beta angle gamma 42.951 42.951 140.101 90.00 90.00 120.00
method	X-Ray Diffraction	resolution	2.60 Å
Primary reference	Domain metastability: a molecular basis for immunoglobulin deposition?, Sonnen AF, Yu C, Evans EJ, Stuart DI, Davis SJ, Gilbert RJ, J Mol Biol. 2010 Jun 4;399(2):207-13. Epub 2010 Apr 13. PMID:20394753

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (25 Kb) [Save to disk] Biological Unit Coordinates (2x44.pdb1.gz) 40 Kb CSU: Contacts of Structural Units for 2X44 Structure Factors (31 Kb) Retrieve 2X44 in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 2X44 from S2C, [Save to disk] Re-refined 2x44 structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 2X44 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 2X44

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 2X44, from MSDmotif at EBI Fold representative 2x44 from FSSP and Dali (Families of Structurally Similar Proteins)

Sequence-derived information

View one-letter amino acid or nucleotide sequence for each chain: [2x44_D] SWISS-PROT database: Domain organization of by SWISSPFAM Alignments of the sequence of 2X44 with the sequences similar proteins can be viewed for 2X44's classification 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 at ProtoMap. Click on the Cluster number.

Other resources with information on 2X44

Community annotation for 2X44 at PDBWiki (http://pdbwiki.org) MMDB (Entrez's Structure Database)

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