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O95985

- TOP3B_HUMAN

UniProt

O95985 - TOP3B_HUMAN

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Protein
DNA topoisomerase 3-beta-1
Gene
TOP3B, TOP3B1
Organism
Homo sapiens (Human)
Status
Reviewed - Annotation score: 5 out of 5 - Experimental evidence at transcript leveli

Functioni

Releases the supercoiling and torsional tension of DNA introduced during the DNA replication and transcription by transiently cleaving and rejoining one strand of the DNA duplex. Introduces a single-strand break via transesterification at a target site in duplex DNA. The scissile phosphodiester is attacked by the catalytic tyrosine of the enzyme, resulting in the formation of a DNA-(5'-phosphotyrosyl)-enzyme intermediate and the expulsion of a 3'-OH DNA strand. The free DNA strand than undergoes passage around the unbroken strand thus removing DNA supercoils. Finally, in the religation step, the DNA 3'-OH attacks the covalent intermediate to expel the active-site tyrosine and restore the DNA phosphodiester backbone By similarity. Possesses negatively supercoiled DNA relaxing activity.

Catalytic activityi

ATP-independent breakage of single-stranded DNA, followed by passage and rejoining.

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Active sitei336 – 3361O-(5'-phospho-DNA)-tyrosine intermediate By similarity

GO - Molecular functioni

  1. ATP binding Source: UniProtKB-KW
  2. DNA binding Source: ProtInc
  3. DNA topoisomerase activity Source: ProtInc
  4. DNA topoisomerase type I activity Source: UniProtKB-EC
  5. poly(A) RNA binding Source: UniProtKB

GO - Biological processi

  1. DNA topological change Source: InterPro
  2. chromosome segregation Source: Ensembl
Complete GO annotation...

Keywords - Molecular functioni

Isomerase, Topoisomerase

Keywords - Ligandi

DNA-binding

Names & Taxonomyi

Protein namesi
Recommended name:
DNA topoisomerase 3-beta-1 (EC:5.99.1.2)
Alternative name(s):
DNA topoisomerase III beta-1
Gene namesi
Name:TOP3B
Synonyms:TOP3B1
OrganismiHomo sapiens (Human)
Taxonomic identifieri9606 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresPrimatesHaplorrhiniCatarrhiniHominidaeHomo
ProteomesiUP000005640: Chromosome 22

Organism-specific databases

HGNCiHGNC:11993. TOP3B.

Subcellular locationi

GO - Cellular componenti

  1. condensed chromosome Source: Ensembl
  2. nucleus Source: HPA
Complete GO annotation...

Pathology & Biotechi

Organism-specific databases

PharmGKBiPA36674.

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 862862DNA topoisomerase 3-beta-1
PRO_0000145192Add
BLAST

Proteomic databases

MaxQBiO95985.
PaxDbiO95985.
PRIDEiO95985.

PTM databases

PhosphoSiteiO95985.

Expressioni

Tissue specificityi

Isoform 1 is found in testis, heart and skeletal muscle. A 4 kb transcript which probably represents isoform 2 is found in thymus, kidney and pancreas.1 Publication

Gene expression databases

ArrayExpressiO95985.
BgeeiO95985.
CleanExiHS_TOP3B.
GenevestigatoriO95985.

Organism-specific databases

HPAiHPA032134.

Interactioni

Protein-protein interaction databases

BioGridi114452. 14 interactions.
IntActiO95985. 3 interactions.
MINTiMINT-1458306.
STRINGi9606.ENSP00000349705.

Structurei

3D structure databases

ProteinModelPortaliO95985.
SMRiO95985. Positions 5-633.

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Domaini3 – 153151Toprim
Add
BLAST

Sequence similaritiesi

Contains 1 Toprim domain.

Phylogenomic databases

eggNOGiCOG0550.
HOGENOMiHOG000184378.
HOVERGENiHBG059857.
InParanoidiO95985.
KOiK03165.
OMAiCQHSLSM.
OrthoDBiEOG7RBZ7N.
PhylomeDBiO95985.
TreeFamiTF105288.

Family and domain databases

Gene3Di1.10.460.10. 2 hits.
2.70.20.10. 2 hits.
3.40.50.140. 1 hit.
InterProiIPR000380. Topo_IA.
IPR003601. Topo_IA_2.
IPR023406. Topo_IA_AS.
IPR013497. Topo_IA_cen.
IPR013824. Topo_IA_cen_sub1.
IPR013825. Topo_IA_cen_sub2.
IPR023405. Topo_IA_core_domain.
IPR003602. Topo_IA_DNA-bd.
IPR006171. Toprim_domain.
[Graphical view]
PANTHERiPTHR11390. PTHR11390. 1 hit.
PfamiPF01131. Topoisom_bac. 1 hit.
PF01751. Toprim. 1 hit.
[Graphical view]
PRINTSiPR00417. PRTPISMRASEI.
SMARTiSM00437. TOP1Ac. 1 hit.
SM00436. TOP1Bc. 1 hit.
SM00493. TOPRIM. 1 hit.
[Graphical view]
SUPFAMiSSF56712. SSF56712. 1 hit.
PROSITEiPS00396. TOPOISOMERASE_I_PROK. 1 hit.
PS50880. TOPRIM. 1 hit.
[Graphical view]

Sequences (3)i

Sequence statusi: Complete.

This entry describes 3 isoformsi produced by alternative splicing. Align

Isoform 1 (identifier: O95985-1) [UniParc]FASTAAdd to Basket

This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry.

« Hide

MKTVLMVAEK PSLAQSIAKI LSRGSLSSHK GLNGACSVHE YTGTFAGQPV    50
RFKMTSVCGH VMTLDFLGKY NKWDKVDPAE LFSQAPTEKK EANPKLNMVK 100
FLQVEGRGCD YIVLWLDCDK EGENICFEVL DAVLPVMNKA HGGEKTVFRA 150
RFSSITDTDI CNAMACLGEP DHNEALSVDA RQELDLRIGC AFTRFQTKYF 200
QGKYGDLDSS LISFGPCQTP TLGFCVERHD KIQSFKPETY WVLQAKVNTD 250
KDRSLLLDWD RVRVFDREIA QMFLNMTKLE KEAQVEATSR KEKAKQRPLA 300
LNTVEMLRVA SSSLGMGPQH AMQTAERLYT QGYISYPRTE TTHYPENFDL 350
KGSLRQQANH PYWADTVKRL LAEGINRPRK GHDAGDHPPI TPMKSATEAE 400
LGGDAWRLYE YITRHFIATV SHDCKYLQST ISFRIGPELF TCSGKTVLSP 450
GFTEVMPWQS VPLEESLPTC QRGDAFPVGE VKMLEKQTNP PDYLTEAELI 500
TLMEKHGIGT DASIPVHINN ICQRNYVTVE SGRRLKPTNL GIVLVHGYYK 550
IDAELVLPTI RSAVEKQLNL IAQGKADYRQ VLGHTLDVFK RKFHYFVDSI 600
AGMDELMEVS FSPLAATGKP LSRCGKCHRF MKYIQAKPSR LHCSHCDETY 650
TLPQNGTIKL YKELRCPLDD FELVLWSSGS RGKSYPLCPY CYNHPPFRDM 700
KKGMGCNECT HPSCQHSLSM LGIGQCVECE SGVLVLDPTS GPKWKVACNK 750
CNVVAHCFEN AHRVRVSADT CSVCEAALLD VDFNKAKSPL PGDETQHMGC 800
VFCDPVFQEL VELKHAASCH PMHRGGPGRR QGRGRGRARR PPGKPNPRRP 850
KDKMSALAAY FV 862
Length:862
Mass (Da):96,662
Last modified:May 1, 1999 - v1
Checksum:i75532827856CFF8F
GO
Isoform 2 (identifier: O95985-2) [UniParc]FASTAAdd to Basket

The sequence of this isoform differs from the canonical sequence as follows:
     703-730: GMGCNECTHPSCQHSLSMLGIGQCVECE → GECSHSLLSTGSCSLFSVPTPALHQAGL
     731-862: Missing.

Show »
Length:730
Mass (Da):82,123
Checksum:i8CC2903C7C4304E6
GO
Isoform 3 (identifier: O95985-3) [UniParc]FASTAAdd to Basket

The sequence of this isoform differs from the canonical sequence as follows:
     703-707: GMGCN → VVPCV
     708-862: Missing.

Show »
Length:707
Mass (Da):79,839
Checksum:iBE43F9D46B50AA85
GO

Sequence cautioni

The sequence BAA20009.1 differs from that shown. Reason: Erroneous gene model prediction.

Natural variant

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Natural varianti365 – 3651D → N.1 Publication
Corresponds to variant rs9610728 [ dbSNP | Ensembl ].
VAR_052591

Alternative sequence

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Alternative sequencei703 – 73028GMGCN…CVECE → GECSHSLLSTGSCSLFSVPT PALHQAGL in isoform 2.
VSP_006525Add
BLAST
Alternative sequencei703 – 7075GMGCN → VVPCV in isoform 3.
VSP_006527
Alternative sequencei708 – 862155Missing in isoform 3.
VSP_006528Add
BLAST
Alternative sequencei731 – 862132Missing in isoform 2.
VSP_006526Add
BLAST

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
AF053082 mRNA. Translation: AAD15791.1.
D87012 Genomic DNA. Translation: BAA20009.1. Sequence problems.
AF017146 mRNA. Translation: AAD01614.1.
AF125216 mRNA. Translation: AAD29670.1.
CR456596 mRNA. Translation: CAG30482.1.
BC002432 mRNA. Translation: AAH02432.1.
CCDSiCCDS13797.1. [O95985-1]
RefSeqiNP_001269041.1. NM_001282112.1. [O95985-1]
NP_001269042.1. NM_001282113.1. [O95985-1]
NP_003926.1. NM_003935.4. [O95985-1]
XP_005261868.1. XM_005261811.1. [O95985-1]
XP_006724412.1. XM_006724349.1. [O95985-1]
XP_006724413.1. XM_006724350.1. [O95985-1]
XP_006724414.1. XM_006724351.1. [O95985-2]
XP_006724415.1. XM_006724352.1. [O95985-3]
UniGeneiHs.436401.

Genome annotation databases

EnsembliENST00000357179; ENSP00000349705; ENSG00000100038. [O95985-1]
ENST00000398793; ENSP00000381773; ENSG00000100038. [O95985-1]
GeneIDi8940.
KEGGihsa:8940.
UCSCiuc002zvs.3. human. [O95985-1]

Keywords - Coding sequence diversityi

Alternative splicing, Polymorphism

Cross-referencesi

Sequence databases

Select the link destinations:
EMBL
GenBank
DDBJ
Links Updated
AF053082 mRNA. Translation: AAD15791.1 .
D87012 Genomic DNA. Translation: BAA20009.1 . Sequence problems.
AF017146 mRNA. Translation: AAD01614.1 .
AF125216 mRNA. Translation: AAD29670.1 .
CR456596 mRNA. Translation: CAG30482.1 .
BC002432 mRNA. Translation: AAH02432.1 .
CCDSi CCDS13797.1. [O95985-1 ]
RefSeqi NP_001269041.1. NM_001282112.1. [O95985-1 ]
NP_001269042.1. NM_001282113.1. [O95985-1 ]
NP_003926.1. NM_003935.4. [O95985-1 ]
XP_005261868.1. XM_005261811.1. [O95985-1 ]
XP_006724412.1. XM_006724349.1. [O95985-1 ]
XP_006724413.1. XM_006724350.1. [O95985-1 ]
XP_006724414.1. XM_006724351.1. [O95985-2 ]
XP_006724415.1. XM_006724352.1. [O95985-3 ]
UniGenei Hs.436401.

3D structure databases

ProteinModelPortali O95985.
SMRi O95985. Positions 5-633.
ModBasei Search...
MobiDBi Search...

Protein-protein interaction databases

BioGridi 114452. 14 interactions.
IntActi O95985. 3 interactions.
MINTi MINT-1458306.
STRINGi 9606.ENSP00000349705.

PTM databases

PhosphoSitei O95985.

Proteomic databases

MaxQBi O95985.
PaxDbi O95985.
PRIDEi O95985.

Protocols and materials databases

DNASUi 8940.
Structural Biology Knowledgebase Search...

Genome annotation databases

Ensembli ENST00000357179 ; ENSP00000349705 ; ENSG00000100038 . [O95985-1 ]
ENST00000398793 ; ENSP00000381773 ; ENSG00000100038 . [O95985-1 ]
GeneIDi 8940.
KEGGi hsa:8940.
UCSCi uc002zvs.3. human. [O95985-1 ]

Organism-specific databases

CTDi 8940.
GeneCardsi GC22M022309.
HGNCi HGNC:11993. TOP3B.
HPAi HPA032134.
MIMi 603582. gene.
neXtProti NX_O95985.
PharmGKBi PA36674.
GenAtlasi Search...

Phylogenomic databases

eggNOGi COG0550.
HOGENOMi HOG000184378.
HOVERGENi HBG059857.
InParanoidi O95985.
KOi K03165.
OMAi CQHSLSM.
OrthoDBi EOG7RBZ7N.
PhylomeDBi O95985.
TreeFami TF105288.

Miscellaneous databases

GeneWikii TOP3B.
GenomeRNAii 8940.
NextBioi 33622.
PROi O95985.
SOURCEi Search...

Gene expression databases

ArrayExpressi O95985.
Bgeei O95985.
CleanExi HS_TOP3B.
Genevestigatori O95985.

Family and domain databases

Gene3Di 1.10.460.10. 2 hits.
2.70.20.10. 2 hits.
3.40.50.140. 1 hit.
InterProi IPR000380. Topo_IA.
IPR003601. Topo_IA_2.
IPR023406. Topo_IA_AS.
IPR013497. Topo_IA_cen.
IPR013824. Topo_IA_cen_sub1.
IPR013825. Topo_IA_cen_sub2.
IPR023405. Topo_IA_core_domain.
IPR003602. Topo_IA_DNA-bd.
IPR006171. Toprim_domain.
[Graphical view ]
PANTHERi PTHR11390. PTHR11390. 1 hit.
Pfami PF01131. Topoisom_bac. 1 hit.
PF01751. Toprim. 1 hit.
[Graphical view ]
PRINTSi PR00417. PRTPISMRASEI.
SMARTi SM00437. TOP1Ac. 1 hit.
SM00436. TOP1Bc. 1 hit.
SM00493. TOPRIM. 1 hit.
[Graphical view ]
SUPFAMi SSF56712. SSF56712. 1 hit.
PROSITEi PS00396. TOPOISOMERASE_I_PROK. 1 hit.
PS50880. TOPRIM. 1 hit.
[Graphical view ]
ProtoNeti Search...

Publicationsi

« Hide 'large scale' publications
  1. "A new human topoisomerase III that interacts with SGS1 protein."
    Ng S.-W., Liu Y., Hasselblatt K.T., Mok S.C., Berkowitz R.S.
    Nucleic Acids Res. 27:993-1000(1999) [PubMed] [Europe PMC] [Abstract]
    Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1), ALTERNATIVE SPLICING, TISSUE SPECIFICITY.
  2. "One-megabase sequence analysis of the human immunoglobulin lambda gene locus."
    Kawasaki K., Minoshima S., Nakato E., Shibuya K., Shintani A., Schmeits J.L., Wang J., Shimizu N.
    Genome Res. 7:250-261(1997) [PubMed] [Europe PMC] [Abstract]
    Cited for: NUCLEOTIDE SEQUENCE [GENOMIC DNA].
  3. Hanai R., Li W., Wang J.C.
    Submitted (AUG-1997) to the EMBL/GenBank/DDBJ databases
    Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1).
  4. Riou J.F., Goulaouic H., Grondard L.
    Submitted (FEB-1999) to the EMBL/GenBank/DDBJ databases
    Cited for: NUCLEOTIDE SEQUENCE [MRNA] (ISOFORM 1).
  5. Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 1).
  6. "The status, quality, and expansion of the NIH full-length cDNA project: the Mammalian Gene Collection (MGC)."
    The MGC Project Team
    Genome Res. 14:2121-2127(2004) [PubMed] [Europe PMC] [Abstract]
    Cited for: NUCLEOTIDE SEQUENCE [LARGE SCALE MRNA] (ISOFORM 1), VARIANT ASN-365.
    Tissue: Skin.

Entry informationi

Entry nameiTOP3B_HUMAN
AccessioniPrimary (citable) accession number: O95985
Secondary accession number(s): A0M8Q3, Q9BUP5
Entry historyi
Integrated into UniProtKB/Swiss-Prot: May 30, 2000
Last sequence update: May 1, 1999
Last modified: September 3, 2014
This is version 136 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program
DisclaimerAny medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care.

Miscellaneousi

Keywords - Technical termi

Complete proteome, Reference proteome

Documents

  1. Human chromosome 22
    Human chromosome 22: entries, gene names and cross-references to MIM
  2. Human entries with polymorphisms or disease mutations
    List of human entries with polymorphisms or disease mutations
  3. Human polymorphisms and disease mutations
    Index of human polymorphisms and disease mutations
  4. MIM cross-references
    Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot
  5. SIMILARITY comments
    Index of protein domains and families

External Data

Dasty 3

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