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(-) Description

Title :  LAC REPRESSOR
 
Authors :  M. Lewis, G. Chang, N. C. Horton, M. A. Kercher, H. C. Pace, P. Lu
Date :  17 Feb 96  (Deposition) - 11 Jul 96  (Release) - 24 Feb 09  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  2.70
Chains :  Asym./Biol. Unit :  A,B,C,D
Keywords :  Transcription Regulation, Dna-Binding, Repressor (Keyword Search: [Gene Ontology, PubMed, Web (Google))
 
Reference :  M. Lewis, G. Chang, N. C. Horton, M. A. Kercher, H. C. Pace, M. A. Schumacher, R. G. Brennan, P. Lu
Crystal Structure Of The Lactose Operon Repressor And Its Complexes With Dna And Inducer.
Science V. 271 1247 1996
PubMed-ID: 8638105
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - LAC REPRESSOR
    ChainsA, B, C, D
    EngineeredYES
    Expression SystemESCHERICHIA COLI
    Expression System GeneLACI
    Expression System PlasmidPIQ
    Expression System Taxid562
    Expression System Vector TypeLAC
    GeneLACI
    Organism ScientificESCHERICHIA COLI
    Organism Taxid562
    StrainGM1

 Structural Features

(-) Chains, Units

  1234
Asymmetric/Biological Unit ABCD

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (0, 0)

(no "Ligand,Modified Residues,Ions" information available for 1LBI)

(-) Sites  (0, 0)

(no "Site" information available for 1LBI)

(-) SS Bonds  (0, 0)

(no "SS Bond" information available for 1LBI)

(-) Cis Peptide Bonds  (0, 0)

(no "Cis Peptide Bond" information available for 1LBI)

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (1, 4)

Asymmetric/Biological Unit (1, 4)
  dbSNPPDB
No.SourceVariant IDVariantUniProt IDStatusIDChainVariant
1UniProtVAR_LACI_ECOLI_001 *Y282DLACI_ECOLI  ---  ---A/B/C/DY282D
   * ID not provided by source

  SNP/SAP Summary Statistics (UniProtKB/Swiss-Prot)

(-) PROSITE Motifs  (0, 0)

(no "PROSITE Motif" information available for 1LBI)

(-) Exons   (0, 0)

(no "Exon" information available for 1LBI)

(-) Sequences/Alignments

Asymmetric/Biological Unit
   Reformat: Number of residues per line =  ('0' or empty: single-line sequence representation)
  Number of residues per labelling interval =   
  UniProt sequence: complete  aligned part    
   Show mapping: SCOP domains CATH domains Pfam domains Secondary structure (by author)
SAPs(SNPs) PROSITE motifs Exons
(details for a mapped element are shown in a popup box when the mouse pointer rests over it)
Chain A from PDB  Type:PROTEIN  Length:296
 aligned with LACI_ECOLI | P03023 from UniProtKB/Swiss-Prot  Length:360

    Alignment length:296
                                    71        81        91       101       111       121       131       141       151       161       171       181       191       201       211       221       231       241       251       261       271       281       291       301       311       321       331       341       351      
           LACI_ECOLI    62 LLIGVATSSLALHAPSQIVAAIKSRADQLGASVVVSMVERSGVEACKAAVHNLLAQRVSGLIINYPLDDQDAIAVEAACTNVPALFLDVSDQTPINSIIFSHEDGTRLGVEHLVALGHQQIALLAGPLSSVSARLRLAGWHKYLTRNQIQPIAEREGDWSAMSGFQQTMQMLNEGIVPTAMLVANDQMALGAMRAITESGLRVGADISVVGYDDTEDSSCYIPPLTTIKQDFRLLGQTSVDRLLQLSQGQAVKGNQLLPVSLVKRKTTLAPNTQTASPRALADSLMQLARQVSRLE 357
               SCOP domains d1lbia_ A: Lac-repressor (lacR) core (C-terminal domain)                                                                                                                                                                                                                                                 SCOP domains
               CATH domains 1lbiA01 A:62-161,A:291-320  [code=3.40.50.2300, no name defined]                                    1lbiA02 A:162-290,A:321-337  [code=3.40.50.2300, no name defined]                                                                1lbiA01 A:62-161,A:291-320    1lbiA02          -------------------- CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .eeeeee.....hhhhhhhhhhhhhhhhh.eeeeeee.....hhhhhhhhhhhhh....eeee......hhhhhhh.......eeeee........eeee..hhhhhhhhhhhh......eeee......hhhhhhhhhhhhhh........eeee....hhhhhhhhhhhh......eeeee..hhhhhhhhhhhhh.........eeeeee....hhh.....eeee..hhhhhhhhhhhhhhhhh......eee...eee...............hhhhhhhhhhhhhhhhhh Sec.struct. author
                 SAPs(SNPs) ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------D--------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1lbi A  62 LLIGVATSSLALHAPSQIVAAIKSRADQLGASVVVSMVERSGVEACKTAVHNLLAQRVSGLIINYPLDDQDAIAVEAACTNVPALFLDVSDQTPINSIIFSHEDGTRLGVEHLVALGHQQIALLAGPLSSVSARLRLAGWHKYLTRNQIQPIAEREGDWSAMSGFQQTMQMLNEGIVPTAMLVANDQMALGAMRAITESGLRVGADISVVGYDDTEDSSCYIPPLTTIKQDFRLLGQTSVDRLLQLSQGQAVKGNQLLPVSLVKRKTTLAPNTQTASPRALADSLMQLARQVSRLE 357
                                    71        81        91       101       111       121       131       141       151       161       171       181       191       201       211       221       231       241       251       261       271       281       291       301       311       321       331       341       351      

Chain B from PDB  Type:PROTEIN  Length:296
 aligned with LACI_ECOLI | P03023 from UniProtKB/Swiss-Prot  Length:360

    Alignment length:296
                                    71        81        91       101       111       121       131       141       151       161       171       181       191       201       211       221       231       241       251       261       271       281       291       301       311       321       331       341       351      
           LACI_ECOLI    62 LLIGVATSSLALHAPSQIVAAIKSRADQLGASVVVSMVERSGVEACKAAVHNLLAQRVSGLIINYPLDDQDAIAVEAACTNVPALFLDVSDQTPINSIIFSHEDGTRLGVEHLVALGHQQIALLAGPLSSVSARLRLAGWHKYLTRNQIQPIAEREGDWSAMSGFQQTMQMLNEGIVPTAMLVANDQMALGAMRAITESGLRVGADISVVGYDDTEDSSCYIPPLTTIKQDFRLLGQTSVDRLLQLSQGQAVKGNQLLPVSLVKRKTTLAPNTQTASPRALADSLMQLARQVSRLE 357
               SCOP domains d1lbib_ B: Lac-repressor (lacR) core (C-terminal domain)                                                                                                                                                                                                                                                 SCOP domains
               CATH domains 1lbiB01 B:62-161,B:291-320  [code=3.40.50.2300, no name defined]                                    1lbiB02 B:162-290,B:321-336  [code=3.40.50.2300, no name defined]                                                                1lbiB01 B:62-161,B:291-320    1lbiB02         --------------------- CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .eeeeee.....hhhhhhhhhhhhhhhhh.eeeeeee.....hhhhhhhhhhhhh....eeee......hhhhhhh.......eeeee........eeee..hhhhhhhhhhhh......eeee......hhhhhhhhhhhhhh........eeee....hhhhhhhhhhhh......eeeee..hhhhhhhhhhhhh.........eeeeee....hhh.....eeee..hhhhhhhhhhhhhhhhh......eee...eee...............hhhhhhhhhhhhhhhhhh Sec.struct. author
                 SAPs(SNPs) ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------D--------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1lbi B  62 LLIGVATSSLALHAPSQIVAAIKSRADQLGASVVVSMVERSGVEACKTAVHNLLAQRVSGLIINYPLDDQDAIAVEAACTNVPALFLDVSDQTPINSIIFSHEDGTRLGVEHLVALGHQQIALLAGPLSSVSARLRLAGWHKYLTRNQIQPIAEREGDWSAMSGFQQTMQMLNEGIVPTAMLVANDQMALGAMRAITESGLRVGADISVVGYDDTEDSSCYIPPLTTIKQDFRLLGQTSVDRLLQLSQGQAVKGNQLLPVSLVKRKTTLAPNTQTASPRALADSLMQLARQVSRLE 357
                                    71        81        91       101       111       121       131       141       151       161       171       181       191       201       211       221       231       241       251       261       271       281       291       301       311       321       331       341       351      

Chain C from PDB  Type:PROTEIN  Length:296
 aligned with LACI_ECOLI | P03023 from UniProtKB/Swiss-Prot  Length:360

    Alignment length:296
                                    71        81        91       101       111       121       131       141       151       161       171       181       191       201       211       221       231       241       251       261       271       281       291       301       311       321       331       341       351      
           LACI_ECOLI    62 LLIGVATSSLALHAPSQIVAAIKSRADQLGASVVVSMVERSGVEACKAAVHNLLAQRVSGLIINYPLDDQDAIAVEAACTNVPALFLDVSDQTPINSIIFSHEDGTRLGVEHLVALGHQQIALLAGPLSSVSARLRLAGWHKYLTRNQIQPIAEREGDWSAMSGFQQTMQMLNEGIVPTAMLVANDQMALGAMRAITESGLRVGADISVVGYDDTEDSSCYIPPLTTIKQDFRLLGQTSVDRLLQLSQGQAVKGNQLLPVSLVKRKTTLAPNTQTASPRALADSLMQLARQVSRLE 357
               SCOP domains d1lbic_ C: Lac-repressor (lacR) core (C-terminal domain)                                                                                                                                                                                                                                                 SCOP domains
               CATH domains 1lbiC01 C:62-161,C:291-320  [code=3.40.50.2300, no name defined]                                    1lbiC02 C:162-290,C:321-336  [code=3.40.50.2300, no name defined]                                                                1lbiC01 C:62-161,C:291-320    1lbiC02         --------------------- CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author .eeeeee.....hhhhhhhhhhhhhhhhh.eeeeeee.....hhhhhhhhhhhhh....eeee......hhhhhhh.......eeeee........eeee..hhhhhhhhhhhh......eeee......hhhhhhhhhhhhhh........eeee....hhhhhhhhhhhh......eeeee..hhhhhhhhhhhhh.........eeeeee....hhh.....eeee..hhhhhhhhhhhhhhhhh......eee...eee...............hhhhhhhhhhhhhhhhhh Sec.struct. author
                 SAPs(SNPs) ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------D--------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1lbi C  62 LLIGVATSSLALHAPSQIVAAIKSRADQLGASVVVSMVERSGVEACKTAVHNLLAQRVSGLIINYPLDDQDAIAVEAACTNVPALFLDVSDQTPINSIIFSHEDGTRLGVEHLVALGHQQIALLAGPLSSVSARLRLAGWHKYLTRNQIQPIAEREGDWSAMSGFQQTMQMLNEGIVPTAMLVANDQMALGAMRAITESGLRVGADISVVGYDDTEDSSCYIPPLTTIKQDFRLLGQTSVDRLLQLSQGQAVKGNQLLPVSLVKRKTTLAPNTQTASPRALADSLMQLARQVSRLE 357
                                    71        81        91       101       111       121       131       141       151       161       171       181       191       201       211       221       231       241       251       261       271       281       291       301       311       321       331       341       351      

Chain D from PDB  Type:PROTEIN  Length:296
 aligned with LACI_ECOLI | P03023 from UniProtKB/Swiss-Prot  Length:360

    Alignment length:296
                                    71        81        91       101       111       121       131       141       151       161       171       181       191       201       211       221       231       241       251       261       271       281       291       301       311       321       331       341       351      
           LACI_ECOLI    62 LLIGVATSSLALHAPSQIVAAIKSRADQLGASVVVSMVERSGVEACKAAVHNLLAQRVSGLIINYPLDDQDAIAVEAACTNVPALFLDVSDQTPINSIIFSHEDGTRLGVEHLVALGHQQIALLAGPLSSVSARLRLAGWHKYLTRNQIQPIAEREGDWSAMSGFQQTMQMLNEGIVPTAMLVANDQMALGAMRAITESGLRVGADISVVGYDDTEDSSCYIPPLTTIKQDFRLLGQTSVDRLLQLSQGQAVKGNQLLPVSLVKRKTTLAPNTQTASPRALADSLMQLARQVSRLE 357
               SCOP domains d1lbid_ D: Lac-repressor (lacR) core (C-terminal domain)                                                                                                                                                                                                                                                 SCOP domains
               CATH domains 1lbiD01 D:62-161,D:291-320  [code=3.40.50.2300, no name defined]                                    1lbiD02 D:162-290,D:321-336  [code=3.40.50.2300, no name defined]                                                                1lbiD01 D:62-161,D:291-320    1lbiD02         --------------------- CATH domains
           Pfam domains (1) -------------------------------------------------------------------------------------------------------------Peripla_BP_3-1lbiD01 D:171-329                                                                                                                                 ---------------------------- Pfam domains (1)
           Pfam domains (2) -------------------------------------------------------------------------------------------------------------Peripla_BP_3-1lbiD02 D:171-329                                                                                                                                 ---------------------------- Pfam domains (2)
           Pfam domains (3) -------------------------------------------------------------------------------------------------------------Peripla_BP_3-1lbiD03 D:171-329                                                                                                                                 ---------------------------- Pfam domains (3)
           Pfam domains (4) -------------------------------------------------------------------------------------------------------------Peripla_BP_3-1lbiD04 D:171-329                                                                                                                                 ---------------------------- Pfam domains (4)
         Sec.struct. author .eeeeee.....hhhhhhhhhhhhhhhhh.eeeeeee.....hhhhhhhhhhhhh....eeee......hhhhhhh.......eeeee........eeee..hhhhhhhhhhhh......eeee......hhhhhhhhhhhhhh........eeee....hhhhhhhhhhhh......eeeee..hhhhhhhhhhhhh.........eeeeee....hhh.....eeee..hhhhhhhhhhhhhhhhh......eee...eee...............hhhhhhhhhhhhhhhhhh Sec.struct. author
                 SAPs(SNPs) ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------D--------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1lbi D  62 LLIGVATSSLALHAPSQIVAAIKSRADQLGASVVVSMVERSGVEACKTAVHNLLAQRVSGLIINYPLDDQDAIAVEAACTNVPALFLDVSDQTPINSIIFSHEDGTRLGVEHLVALGHQQIALLAGPLSSVSARLRLAGWHKYLTRNQIQPIAEREGDWSAMSGFQQTMQMLNEGIVPTAMLVANDQMALGAMRAITESGLRVGADISVVGYDDTEDSSCYIPPLTTIKQDFRLLGQTSVDRLLQLSQGQAVKGNQLLPVSLVKRKTTLAPNTQTASPRALADSLMQLARQVSRLE 357
                                    71        81        91       101       111       121       131       141       151       161       171       181       191       201       211       221       231       241       251       261       271       281       291       301       311       321       331       341       351      

   Legend:   → Mismatch (orange background)
  - → Gap (green background, '-', border residues have a numbering label)
    → Modified Residue (blue background, lower-case, 'x' indicates undefined single-letter code, labelled with number + name)
  x → Chemical Group (purple background, 'x', labelled with number + name, e.g. ACE or NH2)
  extra numbering lines below/above indicate numbering irregularities and modified residue names etc., number ends below/above '|'

 Classification and Annotation

(-) SCOP Domains  (1, 4)

Asymmetric/Biological Unit

(-) CATH Domains  (1, 8)

Asymmetric/Biological Unit
(-)
Class: Alpha Beta (26913)
1a1lbiB02B:162-290,B:321-336
1b1lbiC02C:162-290,C:321-336
1c1lbiC01C:62-161,C:291-320
1d1lbiD01D:62-161,D:291-320
1e1lbiD02D:162-290,D:321-336
1f1lbiA02A:162-290,A:321-337
1g1lbiA01A:62-161,A:291-320
1h1lbiB01B:62-161,B:291-320

(-) Pfam Domains  (1, 4)

Asymmetric/Biological Unit

(-) Gene Ontology  (8, 8)

Asymmetric/Biological Unit(hide GO term definitions)
Chain A,B,C,D   (LACI_ECOLI | P03023)
molecular function
    GO:0003677    DNA binding    Any molecular function by which a gene product interacts selectively and non-covalently with DNA (deoxyribonucleic acid).
    GO:0000986    bacterial-type RNA polymerase core promoter proximal region sequence-specific DNA binding    Interacting selectively and non-covalently with a sequence of DNA that is in cis with and relatively close to a core promoter for a bacterial-type RNA polymerase.
    GO:0003700    transcription factor activity, sequence-specific DNA binding    Interacting selectively and non-covalently with a specific DNA sequence in order to modulate transcription. The transcription factor may or may not also interact selectively with a protein or macromolecular complex.
    GO:0001141    transcriptional repressor activity, bacterial-type RNA polymerase core promoter proximal region sequence-specific binding    Interacting selectively and non-covalently with a sequence of DNA that is in cis with and relatively close to a core promoter for a bacterial-type RNA polymerase in order to stop, prevent, or reduce the frequency, rate or extent of transcription from a bacterial-type RNA polymerase promoter.
biological process
    GO:0045892    negative regulation of transcription, DNA-templated    Any process that stops, prevents, or reduces the frequency, rate or extent of cellular DNA-templated transcription.
    GO:0006355    regulation of transcription, DNA-templated    Any process that modulates the frequency, rate or extent of cellular DNA-templated transcription.
    GO:0006351    transcription, DNA-templated    The cellular synthesis of RNA on a template of DNA.
cellular component
    GO:0005829    cytosol    The part of the cytoplasm that does not contain organelles but which does contain other particulate matter, such as protein complexes.

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 Related Entries

(-) Entries Sharing at Least One Protein Chain (UniProt ID)

UniProtKB/Swiss-Prot
        LACI_ECOLI | P030231cjg 1efa 1jwl 1jye 1jyf 1l1m 1lbg 1lbh 1lcc 1lcd 1lqc 1ltp 1osl 1tlf 1z04 2bjc 2kei 2kej 2kek 2p9h 2paf 2pe5 3edc 4rzs 4rzt

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