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(-) Description

Authors :  A. Ioanoviciu, S. Antony, Y. Pommier, B. L. Staker, L. Stewart, M. Cushman
Date :  09 Jun 04  (Deposition) - 21 Jun 05  (Release) - 24 Feb 09  (Revision)
Resolution :  3.10
Chains :  Asym./Biol. Unit :  A,B,C,D
Keywords :  Complex (Isomerase/Dna), Dna, Topoisomerase I, Drug, Poison, Idenoisoquinoline (Keyword Search: [Gene Ontology, PubMed, Web (Google))
Reference :  A. Ioanoviciu, S. Antony, Y. Pommier, B. L. Staker, L. Stewart, M. Cushman
Synthesis And Mechanism Of Action Studies Of A Series Of Norindenoisoquinoline Topoisomerase I Poisons Reveal An Inhibitor With A Flipped Orientation In The Ternary Dna-Enzyme-Inhibitor Complex As Determined By X-Ray Crystallographic Analysis
J. Med. Chem. V. 48 4803 2005
PubMed-ID: 16033260  |  Reference-DOI: 10.1021/JM050076B
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - 5'-D(*AP*AP*AP*AP*AP*GP*AP*CP*TP*T)-3'
Molecule 2 - 5'-D(*(TPC)P*GP*AP*AP*AP*AP*AP*TP*TP*TP*TP*T)-3'
    EC Number5.99.1.2
    Expression System CommonFALL ARMYWORM
    Expression System Taxid7108
    Expression System Vector TypeBACULOVIRUS
    Organism CommonHUMAN
    Organism ScientificHOMO SAPIENS
    Organism Taxid9606

 Structural Features

(-) Chains, Units

Asymmetric/Biological Unit ABCD

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (3, 3)

Asymmetric/Biological Unit (3, 3)
No.NameCountTypeFull Name

(-) Sites  (1, 1)

Asymmetric Unit (1, 1)
1AC1SOFTWAREARG A:364 , THR A:718 , ASN A:722 , DT B:10 , TPC C:11 , DG D:112 , DA D:113BINDING SITE FOR RESIDUE AI3 D 901

(-) SS Bonds  (0, 0)

(no "SS Bond" information available for 1TL8)

(-) Cis Peptide Bonds  (0, 0)

(no "Cis Peptide Bond" information available for 1TL8)

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (6, 6)

Asymmetric/Biological Unit (6, 6)
No.SourceVariant IDVariantUniProt IDStatusIDChainVariant
2UniProtVAR_036555K326RTOP1_HUMANUnclassified  ---AK326R
3UniProtVAR_010666M370TTOP1_HUMANUnclassified  ---AM370T
5UniProtVAR_010667N722STOP1_HUMANUnclassified  ---AN722S
6UniProtVAR_007531T729ATOP1_HUMANUnclassified  ---AT729A

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

(-) PROSITE Motifs  (1, 1)

Asymmetric/Biological Unit (1, 1)
1TOPOISOMERASE_I_EUKPS00176 Eukaryotic DNA topoisomerase I active site.TOP1_HUMAN710-728  1A:710-728

(-) Exons   (14, 14)

Asymmetric/Biological Unit (14, 14)
No.Transcript IDExonExon IDGenome LocationLengthIDLocationLengthCountLocationLength

(-) 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:565
 aligned with TOP1_HUMAN | P11387 from UniProtKB/Swiss-Prot  Length:765

    Alignment length:565
                                   210       220       230       240       250       260       270       280       290       300       310       320       330       340       350       360       370       380       390       400       410       420       430       440       450       460       470       480       490       500       510       520       530       540       550       560       570       580       590       600       610       620       630       640       650       660       670       680       690       700       710       720       730       740       750       760     
               SCOP domains d1tl8a3 A:201-430 Eukaryotic DNA topoisomerase I, N-terminal DNA-binding fragment                                                                                                                                                     d1tl8a2 A:431-633,A:714-765 Eukaryotic DNA topoisomerase I, catalytic core                                                                                                                                 --d1tl8a1 A:636-712 Eukaryotic DNA topoisomerase I, dispensable insert domain  -d1tl8a2 A:431-633,A:714-765                          SCOP domains
               CATH domains 1tl8A01 A:201-231,A:320-431    1tl8A02 A:232-319 Yeast DNA topoisomerase - domain 1                                    1tl8A01 A:201-231,A:320-431 DNA Topoisomerase I, domain 2                                                       1tl8A03 A:432-586 Topoisomerase I; Chain A, domain 3                                                                                                       1tl8A04 A:587-765  [code=, no name defined]                                                                                                                              CATH domains
               Pfam domains ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author Sec.struct. author
                 SAPs(SNPs) -------------S---------------------------------------------------------------------------------------------------------------R-------------------------------------------T------------------------------------------------------------------------------------------------------------------------------------------------------------------G--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------S------A------------------------------------ SAPs(SNPs)
                    PROSITE -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------TOPOISOMERASE_I_EUK------------------------------------- PROSITE
           Transcript 1 (1) 1.8  --------------------------------------Exon 1.10  PDB: A:244-284                Exon 1.11  PDB: A:285-325                Exon 1.12  PDB: A:326-388 UniProt: 326-388                     ------------------------------------------------Exon 1.14  PDB: A:437-484 UniProt: 437-484      Exon 1.15  PDB: A:485-546 UniProt: 485-546                    Exon 1.16              Exon 1.17  PDB: A:570-608              ------------------------------------------Exon 1.19  PDB: A:651-682       -------------------------------------------------Exon 1.21  PDB: A:732-765          Transcript 1 (1)
           Transcript 1 (2) ----Exon 1.9  PDB: A:205-244                -----------------------------------------------------------------------------------------------------------------------------------------------Exon 1.13  PDB: A:388-436 UniProt: 388-436       ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------Exon 1.18  PDB: A:608-650 UniProt: 608-650 -------------------------------Exon 1.20  PDB: A:682-732 UniProt: 682-732         --------------------------------- Transcript 1 (2)
                                   210       220       230       240       250       260       270       280       290       300       310       320       330       340       350       360       370       380       390       400       410       420       430       440       450       460       470       480       490       500       510       520       530       540       550       560       570       580       590       600       610       620       630       640       650       660       670       680       690       700       710       720  |    730       740       750       760     

Chain B from PDB  Type:DNA  Length:10
                 1tl8 B   1 AAAAAGACTT  10

Chain C from PDB  Type:DNA  Length:12
                 1tl8 C  11 cGAAAAATTTTT  22
                            |       20  

Chain D from PDB  Type:DNA  Length:22
                 1tl8 D 101 AAAAATTTTTCGAAGTCTTTTT 122
                                   110       120  

   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  (3, 3)

Asymmetric/Biological Unit

(-) CATH Domains  (4, 4)

Asymmetric/Biological Unit
Class: Alpha Beta (26913)
Class: Mainly Beta (13760)

(-) Pfam Domains  (0, 0)

(no "Pfam Domain" information available for 1TL8)

(-) Gene Ontology  (30, 30)

Asymmetric/Biological Unit(hide GO term definitions)
Chain A   (TOP1_HUMAN | P11387)
molecular function
    GO:0003677    DNA binding    Any molecular function by which a gene product interacts selectively and non-covalently with DNA (deoxyribonucleic acid).
    GO:0003916    DNA topoisomerase activity    Catalysis of the transient cleavage and passage of individual DNA strands or double helices through one another, resulting a topological transformation in double-stranded DNA.
    GO:0003917    DNA topoisomerase type I activity    Catalysis of a DNA topological transformation by transiently cleaving one DNA strand at a time to allow passage of another strand; changes the linking number by +1 per catalytic cycle.
    GO:0003918    DNA topoisomerase type II (ATP-hydrolyzing) activity    Catalysis of a DNA topological transformation by transiently cleaving a pair of complementary DNA strands to form a gate through which a second double-stranded DNA segment is passed, after which the severed strands in the first DNA segment are rejoined; product release is coupled to ATP binding and hydrolysis; changes the linking number in multiples of 2.
    GO:0003682    chromatin binding    Interacting selectively and non-covalently with chromatin, the network of fibers of DNA, protein, and sometimes RNA, that make up the chromosomes of the eukaryotic nucleus during interphase.
    GO:0001046    core promoter sequence-specific DNA binding    Interacting selectively and non-covalently with a sequence of DNA that is part of a core promoter region composed of the transcription start site and binding sites for the basal transcription machinery. The transcribed region might be described as a gene, cistron, or operon.
    GO:0016853    isomerase activity    Catalysis of the geometric or structural changes within one molecule. Isomerase is the systematic name for any enzyme of EC class 5.
    GO:0005515    protein binding    Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).
biological process
    GO:0006260    DNA replication    The cellular metabolic process in which a cell duplicates one or more molecules of DNA. DNA replication begins when specific sequences, known as origins of replication, are recognized and bound by initiation proteins, and ends when the original DNA molecule has been completely duplicated and the copies topologically separated. The unit of replication usually corresponds to the genome of the cell, an organelle, or a virus. The template for replication can either be an existing DNA molecule or RNA.
    GO:0006265    DNA topological change    The process in which a transformation is induced in the topological structure of a double-stranded DNA helix, resulting in a change in linking number.
    GO:0006338    chromatin remodeling    Dynamic structural changes to eukaryotic chromatin occurring throughout the cell division cycle. These changes range from the local changes necessary for transcriptional regulation to global changes necessary for chromosome segregation.
    GO:0007059    chromosome segregation    The process in which genetic material, in the form of chromosomes, is organized into specific structures and then physically separated and apportioned to two or more sets. In eukaryotes, chromosome segregation begins with the condensation of chromosomes, includes chromosome separation, and ends when chromosomes have completed movement to the spindle poles.
    GO:0032922    circadian regulation of gene expression    Any process that modulates the frequency, rate or extent of gene expression such that an expression pattern recurs with a regularity of approximately 24 hours.
    GO:0007623    circadian rhythm    Any biological process in an organism that recurs with a regularity of approximately 24 hours.
    GO:0040016    embryonic cleavage    The first few specialized divisions of an activated animal egg.
    GO:0016310    phosphorylation    The process of introducing a phosphate group into a molecule, usually with the formation of a phosphoric ester, a phosphoric anhydride or a phosphoric amide.
    GO:0012501    programmed cell death    A process which begins when a cell receives an internal or external signal and activates a series of biochemical events (signaling pathway). The process ends with the death of the cell.
    GO:0016925    protein sumoylation    The process in which a SUMO protein (small ubiquitin-related modifier) is conjugated to a target protein via an isopeptide bond between the carboxyl terminus of SUMO with an epsilon-amino group of a lysine residue of the target protein.
    GO:0042493    response to drug    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 drug stimulus. A drug is a substance used in the diagnosis, treatment or prevention of a disease.
    GO:0048511    rhythmic process    Any process pertinent to the generation and maintenance of rhythms in the physiology of an organism.
    GO:0016032    viral process    A multi-organism process in which a virus is a participant. The other participant is the host. Includes infection of a host cell, replication of the viral genome, and assembly of progeny virus particles. In some cases the viral genetic material may integrate into the host genome and only subsequently, under particular circumstances, 'complete' its life cycle.
cellular component
    GO:0000932    P-body    A focus in the cytoplasm where mRNAs may become inactivated by decapping or some other mechanism. Protein and RNA localized to these foci are involved in mRNA degradation, nonsense-mediated mRNA decay (NMD), translational repression, and RNA-mediated gene silencing.
    GO:0005694    chromosome    A structure composed of a very long molecule of DNA and associated proteins (e.g. histones) that carries hereditary information.
    GO:0005737    cytoplasm    All of the contents of a cell excluding the plasma membrane and nucleus, but including other subcellular structures.
    GO:0000228    nuclear chromosome    A chromosome that encodes the nuclear genome and is found in the nucleus of a eukaryotic cell during the cell cycle phases when the nucleus is intact.
    GO:0005730    nucleolus    A small, dense body one or more of which are present in the nucleus of eukaryotic cells. It is rich in RNA and protein, is not bounded by a limiting membrane, and is not seen during mitosis. Its prime function is the transcription of the nucleolar DNA into 45S ribosomal-precursor RNA, the processing of this RNA into 5.8S, 18S, and 28S components of ribosomal RNA, and the association of these components with 5S RNA and proteins synthesized outside the nucleolus. This association results in the formation of ribonucleoprotein precursors; these pass into the cytoplasm and mature into the 40S and 60S subunits of the ribosome.
    GO:0005654    nucleoplasm    That part of the nuclear content other than the chromosomes or the nucleolus.
    GO:0005634    nucleus    A membrane-bounded organelle of eukaryotic cells in which chromosomes are housed and replicated. In most cells, the nucleus contains all of the cell's chromosomes except the organellar chromosomes, and is the site of RNA synthesis and processing. In some species, or in specialized cell types, RNA metabolism or DNA replication may be absent.
    GO:0043204    perikaryon    The portion of the cell soma (neuronal cell body) that excludes the nucleus.
    GO:0031298    replication fork protection complex    A protein complex conserved in eukaryotes and associated with the replication fork; the complex stabilizes stalled replication forks and is thought to be involved in coordinating leading- and lagging-strand synthesis and in replication checkpoint signaling.


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 Related Entries

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

        TOP1_HUMAN | P113871a31 1a35 1a36 1ej9 1k4s 1k4t 1lpq 1nh3 1r49 1rr8 1rrj 1sc7 1seu 1t8i

(-) Related Entries Specified in the PDB File