1LT3	Enterotoxin	date	Apr 12, 1997
title	Heat-Labile Enterotoxin Double Mutant N40cg166c
authors	F.Van Den Akker, W.G.J.Hol
compound		source
Molecule: Heat-Labile Enterotoxin Chain: D, E, F, G, H Fragment: Holotoxin Synonym: Lt-I Engineered: Yes Mutation: Yes Other_details: Lactose Bound		Organism_scientific: Escherichia Coli Organism_taxid: 562 Strain: Porcine Expression_system: Escherichia Coli Expression_system_taxid: 562 Expression_system_strain: Mc1061 Expression_system_vector: Profit
Molecule: Heat-Labile Enterotoxin Chain: A Fragment: Holotoxin Synonym: Lt-I Engineered: Yes Mutation: Yes Other_details: Lactose Bound		Organism_scientific: Escherichia Coli Organism_taxid: 562 Strain: Porcine Expression_system: Escherichia Coli Expression_system_taxid: 562 Expression_system_strain: Mc1061 Expression_system_vector: Profit
symmetry	Space Group: P 21 21 21	R_factor 0.188 R_Free 0.261
crystal cell	length a length b length c angle alpha angle beta angle gamma 119.700 101.100 64.200 90.00 90.00 90.00
method	X-Ray Diffraction	resolution	2.00 Å
ligand	BGC, GAL	enzyme
related structures	by homologous chain: 1G8Z, 1LT4, 1LTS
Gene Ontology	Chain Function Process Component A toxin activity H, F, D, G, E toxin activity
Primary reference	Crystal structure of heat-labile enterotoxin from Escherichia coli with increased thermostability introduced by an engineered disulfide bond in the A subunit., van den Akker F, Feil IK, Roach C, Platas AA, Merritt EA, Hol WG, Protein Sci 1997 Dec;6(12):2644-9. PMID:9416616

Data retrieval

Asymmetric unit, PDB entry: [header only] [complete with coordinates] (126 Kb) [Save to disk] Biological Unit Coordinates (1lt3.pdb1.gz) 121 Kb LPC: Ligand-Protein Contacts for 1LT3 CSU: Contacts of Structural Units for 1LT3 Likely Quarternary Molecular Structure file(s) for 1LT3 Structure Factors (501 Kb) Retrieve 1LT3 in mmCIF format [Save to disk] SEQRES to COORDINATES correlation for 1LT3 from S2C, [Save to disk] Re-refined 1lt3 structure from PDB_REDO, a databank with updated and optimised macromolecular X-ray diffraction structure models

View 1LT3 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 1LT3

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 3D motif for 1LT3, from MSDmotif at EBI Genome occurence of 1LT3's fold from GeneCensus Classification of representative domains in scop (Structural Classification of Proteins)     - Domain d1lt3a_, region A [Jmol] [rasmolscript] [script source]     - Domain d1lt3d_, region D [Jmol] [rasmolscript] [script source]     - Domain d1lt3e_, region E [Jmol] [rasmolscript] [script source]     - Domain d1lt3f_, region F [Jmol] [rasmolscript] [script source]     - Domain d1lt3g_, region G [Jmol] [rasmolscript] [script source]     - Domain d1lt3h_, region H [Jmol] [rasmolscript] [script source] 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: [1lt3] [1lt3_H] [1lt3_G] [1lt3_A] [1lt3_F] [1lt3_E] [1lt3_D] SWISS-PROT database: [P06717] [P32890] Domain organization of [ELAP_ECOLX] [ELBP_ECOLX] by SWISSPFAM

Other resources with information on 1LT3

Community annotation for 1LT3 at PDBWiki (http://pdbwiki.org) MMDB (Entrez's Structure Database)

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