1D5X	Immune System	date	Oct 12, 1999
title	X-Ray Crystal Structure Of Hla-Dr4 Complexed With Dipeptide Mimetic And Seb
authors	A.Swain, R.Crowther, U.Kammlott
compound		source
Molecule: Protein (Hla Class II Histocompatibility Antigen); Chain: A Fragment: Dr Alpha Chain, Extracellular Domain Synonym: Hla-Dr4 Engineered: Yes		Organism_scientific: Homo Sapiens Organism_common: Human Expression_system: Drosophila Melanogaster Expression_system_common: Fruit Fly
Molecule: Protein (Hla Class II Histocompatibility Antigen); Chain: B Fragment: Dr-4 Beta Chain, Extracellular Domain Synonym: Hla-Dr4 Engineered: Yes		Organism_scientific: Homo Sapiens Organism_common: Human Expression_system: Drosophila Melanogaster Expression_system_common: Fruit Fly
Molecule: Protein (Enterotoxin Type B) Chain: C Synonym: Seb, Superantigen		Organism_scientific: Staphylococcus Aureus Organism_common: Bacteria
Molecule: Protein (Dipeptide Mimetic Inhibitor) Chain: D Engineered: Yes		Synthetic: Yes Other_details: The Peptide Was Chemically Synthesized.
symmetry	Space Group: P 21 21 21	R_factor	0.237
crystal cell	length a length b length c angle alpha angle beta angle gamma 90.838 104.252 107.818 90.00 90.00 90.00
method	X-Ray Diffraction	resolution	2.45 Å
ligand	ACE, ALC, HAQ, MAA, SEL	enzyme
related structures	by homologous chain: 1AQD, 1D6E, 1T5X
similarity	Belongs to the mhc class ii family. Belongs to the staphylococcal/streptococcal toxin family. Contains 1 ig-like c1-type (immunoglobulin-like) domain.[MHC_II_alpha]
subunit	Heterodimer of an alpha chain and a beta chain.
polymorphism	The sequence shown is that of drb1*0401. The sequence shown is that of dra*0101. The following alleles of drb1-4 are known: drb1*0401, drb1*0402, drb1*0403, drb1*0404 and drb1*0411. The following alleles of dra are known dra*0102.
subcellular loc.	Secreted protein. Membrane; single-pass type i membrane protein.
Genes	ENTB (S. aureus); HLA-DRA1, HLA-DRA, HLA-DRB1 (H. sapiens)
function	The illness characterized by high fever, hypotension, diarrhea, shock, and in some cases death. Staphylococcal enterotoxins cause the intoxication staphylococcal food poisoning syndrome.
Gene Ontology	Chain Function Process Component A MHC class II receptor activi... antigen processing and prese... immune response antigen processing and prese... lysosome plasma membrane integral to plasma membrane membrane integral to membrane MHC class II protein complex... B MHC class II receptor activi... antigen processing and prese... immune response signal transduction pathogenesis antigen processing and prese... integral to plasma membrane membrane integral to membrane MHC class II protein complex... C pathogenesis extracellular region
Primary reference	Peptide and peptide mimetic inhibitors of antigen presentation by HLA-DR class II MHC molecules. Design, structure-activity relationships, and X-ray crystal structures., Bolin DR, Swain AL, Sarabu R, Berthel SJ, Gillespie P, Huby NJ, Makofske R, Orzechowski L, Perrotta A, Toth K, Cooper JP, Jiang N, Falcioni F, Campbell R, Cox D, Gaizband D, Belunis CJ, Vidovic D, Ito K, Crowther R, Kammlott U, Zhang X, Palermo R, Weber D, Guenot J, Nagy Z, Olson GL, J Med Chem 2000 Jun 1;43(11):2135-48. PMID:10841792

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (105 Kb) [Save to disk] Biological Unit Coordinates (1d5x.pdb1.gz) 101 Kb CSU: Contacts of Structural Units for 1D5X Likely Quarternary Molecular Structure file(s) for 1D5X Structure Factors (319 Kb) Retrieve 1D5X in mmCIF format [Save to disk]

View 1D5X in 3D

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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 1D5X, from MSDmotif at EBI Classification of representative domains in scop (Structural Classification of Proteins)     - Domain d1d5xa2, region A:3-81 [Jmol] [rasmolscript] [script source]     - Domain d1d5xa1, region A:82-181 [Jmol] [rasmolscript] [script source]     - Domain d1d5xb2, region B:1-92 [Jmol] [rasmolscript] [script source]     - Domain d1d5xb1, region B:93-190 [Jmol] [rasmolscript] [script source]     - Domain d1d5xc2, region C:122-238 [Jmol] [rasmolscript] [script source]     - Domain d1d5xc1, region C:2-121 [Jmol] [rasmolscript] [script source] Fold representative 1d5x from FSSP and Dali (Families of Structurally Similar Proteins) 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: [1d5x_C] [1d5x_B] [1d5x_A] [1d5x_D]

Other resources with information on 1D5X

InterPro: IPR001003 , IPR007110 , IPR006173 , IPR003006 , IPR006177 , IPR000353 , IPR006126 , IPR006123 , IPR003597 PDBREPORT (protein verification by WHAT_CHECK procedures) MMDB (Entrez's Structure Database)

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