1KLG Immune System Toxin date Dec 11, 2001
title Crystal Structure Of Hla-Dr1tpi(23-37, Thr28-->Ile Mutant) Complexed With Staphylococcal Enterotoxin C3 Variant 3b2 (Sec3-3b2)
authors E.J.Sundberg, M.W.Sawicki, P.S.Andersen, J.Sidney, A.Sette, R.A.Mariuzza
compound source
Molecule: Hla Class II Histocompatibility Antigen, Dr Alpha Chain;
Chain: A
Fragment: Residues 29-205
Synonym: Hla-Dr1 Alpha Subunit; Hla-Dr Antigen Alpha Chain
Engineered: Yes
Organism_scientific: Homo Sapiens
Organism_common: Human
Organism_taxid: 9606
Expression_system: Escherichia Coli
Expression_system_taxid: 562

Molecule: Hla Class II Histocompatibility Antigen, Dr-1 Beta Chain;
Chain: B
Fragment: Residues 30-219
Synonym: Hla-Dr1 Beta Subunit; Hla-Dr Beta 1 Chain
Engineered: Yes

Organism_scientific: Homo Sapiens
Organism_common: Human
Organism_taxid: 9606
Expression_system: Escherichia Coli
Expression_system_taxid: 562

Molecule: Triosephosphate Isomerase Peptide
Chain: C
Fragment: Residues 23-37
Engineered: Yes
Other_details: Thr28-->Ile Mutant

Synthetic: Yes
Other_details: Peptide Synthesis

Molecule: Enterotoxin Type C-3
Chain: D
Fragment: Residues 29-266
Synonym: Enterotoxin C3; Sec3
Engineered: Yes

Organism_scientific: Staphylococcus Aureus
Organism_taxid: 1280
Variant: 3b2
Expression_system: Escherichia Coli
Expression_system_taxid: 562
symmetry Space Group: H 3
R_factor 0.206 R_Free 0.246
length a length b length c angle alpha angle beta angle gamma
172.986 172.986 121.435 90.00 90.00 120.00
method X-Ray Diffractionresolution 2.40 Å
related structures by homologous chain: 1I4X, 1IEA, 1J8H, 1SE3


  • toxin activity

  • Primary referenceMinor structural changes in a mutated human melanoma antigen correspond to dramatically enhanced stimulation of a CD4+ tumor-infiltrating lymphocyte line., Sundberg EJ, Sawicki MW, Southwood S, Andersen PS, Sette A, Mariuzza RA, J Mol Biol 2002 May 31;319(2):449-61. PMID:12051920
    Data retrieval
  • Asymmetric unit, PDB entry: [header only] [complete with coordinates] (113 Kb) [Save to disk]
  • Biological Unit Coordinates (1klg.pdb1.gz) 108 Kb
  • CSU: Contacts of Structural Units for 1KLG
  • Likely Quarternary Molecular Structure file(s) for 1KLG
  • Structure Factors (705 Kb)
  • Retrieve 1KLG in mmCIF format [Save to disk]
  • SEQRES to COORDINATES correlation for 1KLG from S2C, [Save to disk]
  • Re-refined 1klg structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models
  • View 1KLG 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 1KLG
  • 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 1KLG, from MSDmotif at EBI
  • Classification of representative domains in scop (Structural Classification of Proteins)
        - Domain d1klga2, region A:4-81 [Jmol] [rasmolscript] [script source]
        - Domain d1klga1, region A:82-180 [Jmol] [rasmolscript] [script source]
        - Domain d1klgb2, region B:1-92 [Jmol] [rasmolscript] [script source]
        - Domain d1klgb1, region B:93-190 [Jmol] [rasmolscript] [script source]
        - Domain d1klgd1, region D:1-121 [Jmol] [rasmolscript] [script source]
        - Domain d1klgd2, region D:122-239 [Jmol] [rasmolscript] [script source]
  • Fold representative 1klg 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: [1klg_C] [1klg] [1klg_A] [1klg_B] [1klg_D]
  • SWISS-PROT database: [P04229] [P01903] [P0A0L5]
  • Domain organization of [2B11_HUMAN] [DRA_HUMAN] [ENTC3_STAAU] by SWISSPFAM
  • Domains found in 1KLG: [IGc1] [MHC_II_alpha] [MHC_II_beta ] by SMART
  • Other resources with information on 1KLG
  • Community annotation for 1KLG at PDBWiki (http://pdbwiki.org)
  • MMDB (Entrez's Structure Database)
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