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(-) Description

Title :  CRYSTAL STRUCTURE OF A REX-FAMILY REPRESSOR R90D MUTANT FROM THERMUS AQUATICUS
 
Authors :  K. J. Mclaughlin, C. L. Kielkopf
Date :  06 Aug 09  (Deposition) - 09 Jun 10  (Release) - 16 Jun 10  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  2.40
Chains :  Asym./Biol. Unit :  A,B
Keywords :  Redox-Sensing, Winged Helix, Rossmann Fold, Nicotinamide Adenine Dinucleotide, Nad, Rex, Thermus Aquaticus, Mutant, Dna Binding Protein, Cytoplasm, Dna-Binding, Repressor, Transcription, Transcription Regulation (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )
 
Reference :  K. J. Mclaughlin, C. M. Strain-Damerell, K. Xie, D. Brekasis, A. S. Soares, M. S. Paget, C. L. Kielkopf
Structural Basis For Nadh/Nad+ Redox Sensing By A Rex Family Repressor.
Mol. Cell V. 38 563 2010
PubMed-ID: 20513431  |  Reference-DOI: 10.1016/J.MOLCEL.2010.05.006

(-) Compounds

Molecule 1 - REDOX-SENSING TRANSCRIPTIONAL REPRESSOR REX
    Atcc: BAA-163
    Chains: A, B
    Engineered: YES
    Expression System: ESCHERICHIA COLI
    Expression System Plasmid: PET24
    Expression System Strain: BL21(DE3)
    Expression System Taxid: 562
    Expression System Vector Type: PLASMID
    Gene: REX, TT_C1293
    Mutation: YES
    Organism Scientific: THERMUS THERMOPHILUS HB27
    Organism Taxid: 262724
    Strain: HB27 / DSM 7039

 Structural Features

(-) Chains, Units

  12
Asymmetric/Biological Unit : AB

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (1, 1)

Asymmetric/Biological Unit (1, 1)
No.NameCountTypeFull Name
1CA1Ligand/IonCALCIUM ION

(-) Sites  (1, 1)

Asymmetric Unit (1, 1)
No.NameEvidenceResiduesDescription
1AC1SOFTWAREHOH A:210 , HOH A:320 , HOH A:321 , PRO B:115 , VAL B:118 , HOH B:319BINDING SITE FOR RESIDUE CA A 500

(-) SS Bonds  (0, 0)

(no "SS Bond" information available for 3IKV)

(-) Cis Peptide Bonds  (0, 0)

(no "Cis Peptide Bond" information available for 3IKV)

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 3IKV)

(-) PROSITE Motifs  (0, 0)

(no "PROSITE Motif" information available for 3IKV)

(-) Exons   (0, 0)

(no "Exon" information available for 3IKV)

(-) 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:206
 aligned with REX_THET2 | Q72I39 from UniProtKB/Swiss-Prot  Length:211

    Alignment length:206
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200      
            REX_THET2     1 MKVPEAAISRLITYLRILEELEAQGVHRTSSEQLGELAQVTAFQVRKDLSYFGSYGTRGVGYTVPVLKRELRHILGLNRKWGLCIVGMGRLGSALADYPGFGESFELRGFFDVDPEKVGRPVRGGVIEHVDLLPQRVPGRIEIALLTVPREAAQKAADLLVAAGIKGILNFAPVVLEVPKEVAVENVDFLAGLTRLSFAILNPKWR 206
               SCOP domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SCOP domains
               CATH domains 3ikvA01 A:1-73 'winged helix' repressor DNA binding domain               3ikvA02 A:74-206 NAD(P)-binding Rossmann-like Domain                                                                                  CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ...hhhhhhhhhhhhhhhhhhhhhh..eehhhhhhhhhh.hhhhhhhhhhh..........eehhhhhhhhhhhhh....eeeeee..hhhhhhhhhh......eeeeeeee........ee..eeeee..hhhhhh.....eeee.....hhhhhhhhhhhh...eeee............eeee.hhhhhhhhhhhhhhh.... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 3ikv A   1 MKVPEAAISRLITYLRILEELEAQGVHRTSSEQLGELAQVTAFQVRKDLSYFGSYGTRGVGYTVPVLKRELRHILGLNRKWGLCIVGMGDLGSALADYPGFGESFELRGFFDVDPEKVGRPVRGGVIEHVDLLPQRVPGRIEIALLTVPREAAQKAADLLVAAGIKGILNFAPVVLEVPKEVAVENVDFLAGLTRLSFAILNPKWR 206
                                    10        20        30        40        50        60        70        80        90       100       110       120       130       140       150       160       170       180       190       200      


Chain B from PDB  Type:PROTEIN  Length:205
 aligned with REX_THET2 | Q72I39 from UniProtKB/Swiss-Prot  Length:211

    Alignment length:205
                                    11        21        31        41        51        61        71        81        91       101       111       121       131       141       151       161       171       181       191       201     
            REX_THET2     2 KVPEAAISRLITYLRILEELEAQGVHRTSSEQLGELAQVTAFQVRKDLSYFGSYGTRGVGYTVPVLKRELRHILGLNRKWGLCIVGMGRLGSALADYPGFGESFELRGFFDVDPEKVGRPVRGGVIEHVDLLPQRVPGRIEIALLTVPREAAQKAADLLVAAGIKGILNFAPVVLEVPKEVAVENVDFLAGLTRLSFAILNPKWR 206
               SCOP domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SCOP domains
               CATH domains 3ikvB01 B:2-73 'winged helix' repressor DNA binding domain              3ikvB02 B:74-206 NAD(P)-binding Rossmann-like Domain                                                                                  CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ..hhhhhhhhhhhhhhhhhhhhh...eehhhhhhhhhh.hhhhhhhhhhhh.........eehhhhhhhhhhhh.....eeeeee..hhhhhhhhh.......eeeeeeee........ee..ee.ee.hhhhhh......eeee.....hhhhhhhhhhhh...eeee............eeee.hhhhhhhhhhhhhhh.... Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- PROSITE
                 Transcript ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 3ikv B   2 KVPEAAISRLITYLRILEELEAQGVHRTSSEQLGELAQVTAFQVRKDLSYFGSYGTRGVGYTVPVLKRELRHILGLNRKWGLCIVGMGDLGSALADYPGFGESFELRGFFDVDPEKVGRPVRGGVIEHVDLLPQRVPGRIEIALLTVPREAAQKAADLLVAAGIKGILNFAPVVLEVPKEVAVENVDFLAGLTRLSFAILNPKWR 206
                                    11        21        31        41        51        61        71        81        91       101       111       121       131       141       151       161       171       181       191       201
   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  (0, 0)

(no "SCOP Domain" information available for 3IKV)

(-) CATH Domains  (2, 4)

Asymmetric/Biological Unit
(-)
Class: Alpha Beta (26913)
(-)
Class: Mainly Alpha (13335)

(-) Pfam Domains  (0, 0)

(no "Pfam Domain" information available for 3IKV)

(-) Gene Ontology  (9, 9)

Asymmetric/Biological Unit(hide GO term definitions)
Chain A,B   (REX_THET2 | Q72I39)
molecular function
    GO:0003677    DNA binding    Any molecular function by which a gene product interacts selectively and non-covalently with DNA (deoxyribonucleic acid).
    GO:0050662    coenzyme binding    Interacting selectively and non-covalently with a coenzyme, any of various nonprotein organic cofactors that are required, in addition to an enzyme and a substrate, for an enzymatic reaction to proceed.
    GO:0048037    cofactor binding    Interacting selectively and non-covalently with a cofactor, a substance that is required for the activity of an enzyme or other protein. Cofactors may be inorganic, such as the metal atoms zinc, iron, and copper in certain forms, or organic, in which case they are referred to as coenzymes. Cofactors may either be bound tightly to active sites or bind loosely with the substrate.
    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.
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:0051775    response to redox state    Any process that results in a change in state or activity of a cell or an organism (in terms of movement, secretion, enzyme production, gene expression, etc.) as a result of a stimulus indicating redox state. Redox state refers to the balance of oxidized versus reduced forms of electron donors and acceptors in an organelle, cell or organ; plastoquinone, glutathione (GSH/GSSG), and nicotinamide nucleotides (NAD+/NADH and NADP+/NADPH) are among the most important.
    GO:0006351    transcription, DNA-templated    The cellular synthesis of RNA on a template of DNA.
cellular component
    GO:0005737    cytoplasm    All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.

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 Related Entries

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

UniProtKB/Swiss-Prot
        REX_THET2 | Q72I39: 3ikt 3il2

(-) Related Entries Specified in the PDB File

1xcb CRYSTAL STRUCTURE OF A REX-FAMILY REPRESSOR/NADH COMPLEX FROM THERMUS AQUATICUS
3ikt CRYSTAL STRUCTURE OF A REX-FAMILY REPRESSOR/NAD+/DNA COMPLEX FROM THERMUS AQUATICUS
3il2 CRYSTAL STRUCTURE OF A REX-FAMILY REPRESSOR R90D MUTANT/DNA COMPLEX FROM THERMUS AQUATICUS