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(-) Description

Title :  LAC REPRESSOR HEADPIECE (RESIDUES 1-56), NMR, 32 STRUCTURES
 
Authors :  M. Slijper, A. M. J. J. Bonvin, R. Boelens, R. Kaptein
Date :  13 Aug 96  (Deposition) - 12 Feb 97  (Release) - 24 Feb 09  (Revision)
Method :  SOLUTION NMR
Resolution :  NOT APPLICABLE
Chains :  NMR Structure  :  A  (32x)
Keywords :  Transcription Regulation, Lac Operon, Lac Repressor, Headpiece, Dna (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )
 
Reference :  M. Slijper, A. M. Bonvin, R. Boelens, R. Kaptein
Refined Structure Of Lac Repressor Headpiece (1-56) Determined By Relaxation Matrix Calculations From 2D And 3D Noe Data: Change Of Tertiary Structure Upon Binding To The Lac Operator.
J. Mol. Biol. V. 259 761 1996
PubMed-ID: 8683581  |  Reference-DOI: 10.1006/JMBI.1996.0356
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - LAC REPRESSOR
    Chains: A
    Engineered: YES
    Expression System: ESCHERICHIA COLI
    Expression System Gene: LAC I, THE PART ENCODING ONLY THE FIRST 56 AMINO ACIDS
    Expression System Plasmid: PET-HP56
    Expression System Taxid: 562
    Expression System Vector Type: LAC
    Fragment: HEADPIECE, RESIDUES 1 - 56
    Gene: LAC I THE PART ENCODING ONLY
    Organism Scientific: ESCHERICHIA COLI
    Organism Taxid: 562
    Other Details: THE PROTEIN CONTAINS THE FIRST 56 N- TERMINAL RESIDUES (I.E., THE DNA BINDING REGION) OF THE COMPLETE LAC REPRESSOR PROTEIN
    Other Details - Source: T7 RNA POLYMERASE PROMOTER SYSTEM
    Synonym: LAC HP56
    Variant: DH9

 Structural Features

(-) Chains, Units

  
NMR Structure (32x): 

Summary Information (see also Sequences/Alignments below)

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

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

(-) Sites  (0, 0)

(no "Site" information available for 1LQC)

(-) SS Bonds  (0, 0)

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

(-) Cis Peptide Bonds  (1, 1)

NMR Structure
No.Residues
1Arg A:51 -Val A:52

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 1LQC)

(-) PROSITE Motifs  (2, 2)

NMR Structure (2, 2)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1HTH_LACI_2PS50932 LacI-type HTH domain profile.LACI_ECOLI4-58  1A:4-56
2HTH_LACI_1PS00356 LacI-type HTH domain signature.LACI_ECOLI6-24  1A:6-24

(-) Exons   (0, 0)

(no "Exon" information available for 1LQC)

(-) Sequences/Alignments

NMR Structure
   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:56
 aligned with LACI_ECOLI | P03023 from UniProtKB/Swiss-Prot  Length:360

    Alignment length:56
                                    10        20        30        40        50      
            LACI_ECOLI    1 MKPVTLYDVAEYAGVSYQTVSRVVNQASHVSAKTREKVEAAMAELNYIPNRVAQQL 56
               SCOP domains d1lqca_ A: Lac repressor (LacR), N-terminal domain       SCOP domains
               CATH domains 1lqcA00 A:1-56 lambda repressor-like DNA-binding domains CATH domains
               Pfam domains ----LacI-1lqcA01 A:5-50                           ------ Pfam domains
         Sec.struct. author .....hhhhhhhh...hhhhhhhh.......hhhhhhhhhhhhhh........... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------- SAPs(SNPs)
                PROSITE (1) ---HTH_LACI_2  PDB: A:4-56 UniProt: 4-58                 PROSITE (1)
                PROSITE (2) -----HTH_LACI_1         -------------------------------- PROSITE (2)
                 Transcript -------------------------------------------------------- Transcript
                  1lqc A  1 MKPVTLYDVAEYAGVSYQTVSRVVNQASHVSAKTREKVEAAMAELNYIPNRVAQQL 56
                                    10        20        30        40        50
   Legend:   → Mismatch (orange background)
  - → Gap (green background, '-', border residues have a numbering label)
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  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, 1)

NMR Structure
(-)
Class: All alpha proteins (14657)

(-) CATH Domains  (1, 1)

NMR Structure
(-)
Class: Mainly Alpha (13335)

(-) Pfam Domains  (1, 1)

NMR Structure
(-)
Clan: HTH (544)

(-) Gene Ontology  (8, 8)

NMR Structure(hide GO term definitions)
Chain A   (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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  Cis Peptide Bonds
    Arg A:51 - Val A:52   [ RasMol ]  
 

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 Related Entries

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

UniProtKB/Swiss-Prot
        LACI_ECOLI | P03023: 1cjg 1efa 1jwl 1jye 1jyf 1l1m 1lbg 1lbh 1lbi 1lcc 1lcd 1ltp 1osl 1tlf 1z04 2bjc 2kei 2kej 2kek 2p9h 2paf 2pe5 3edc 4rzs 4rzt

(-) Related Entries Specified in the PDB File

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