1LBI Transcription Regulation date Feb 17, 1996
title Lac Repressor
authors M.Lewis, G.Chang, N.C.Horton, M.A.Kercher, H.C.Pace, P.Lu
compound source
Molecule: Lac Repressor
Chain: A, B, C, D
Engineered: Yes
Organism_scientific: Escherichia Coli
Organism_taxid: 562
Strain: Gm1
Gene: Laci
Expression_system: Escherichia Coli
Expression_system_taxid: 562
Expression_system_vector_type: Lac
Expression_system_plasmid: Piq
Expression_system_gene: Laci
symmetry Space Group: C 1 2 1
R_factor 0.250 R_Free NULL
length a length b length c angle alpha angle beta angle gamma
160.300 73.300 147.800 90.00 120.30 90.00
method X-Ray Diffractionresolution 2.70 Å
related structures by homologous chain: 1EFA, 1JYF
A, D, C, B

Primary referenceCrystal structure of the lactose operon repressor and its complexes with DNA and inducer., Lewis M, Chang G, Horton NC, Kercher MA, Pace HC, Schumacher MA, Brennan RG, Lu P, Science 1996 Mar 1;271(5253):1247-54. PMID:8638105
Data retrieval
  • Asymmetric unit, PDB entry: [header only] [complete with coordinates] (158 Kb) [Save to disk]
  • Biological Unit Coordinates (1lbi.pdb1.gz) 152 Kb
  • CSU: Contacts of Structural Units for 1LBI
  • Likely Quarternary Molecular Structure file(s) for 1LBI
  • Retrieve 1LBI in mmCIF format [Save to disk]
  • SEQRES to COORDINATES correlation for 1LBI from S2C, [Save to disk]
  • View 1LBI 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 1LBI
  • Cartoon representation from PDB Cartoon
  • Ramachandran plot from PDBSum
  • Structure-derived information
  • Dipole moment, from Dipole Server at Weizmann Institute
  • Crystal Contacts, from CryCo at Weizmann Institute
  • 3D motif for 1LBI, from MSDmotif at EBI
  • Genome occurence of 1LBI's fold from GeneCensus
  • Classification of representative domains in scop (Structural Classification of Proteins)
        - Domain d1lbia_, region A [Jmol] [rasmolscript] [script source]
        - Domain d1lbib_, region B [Jmol] [rasmolscript] [script source]
        - Domain d1lbic_, region C [Jmol] [rasmolscript] [script source]
        - Domain d1lbid_, region D [Jmol] [rasmolscript] [script source]
  • Fold representative 1lbi 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: [1lbi_A] [1lbi] [1lbi_C] [1lbi_D] [1lbi_B]
  • SWISS-PROT database: [P03023]
  • Domain organization of [LACI_ECOLI] by SWISSPFAM
  • Domain found in 1LBI: [HTH_LACI ] by SMART
  • Other resources with information on 1LBI
  • Community annotation for 1LBI at PDBWiki (http://pdbwiki.org)
  • MMDB (Entrez's Structure Database)
  • Movements, Movies and Images
  • Images from IMB Jena Image Library of Biological Macromolecules.

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