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Entry version 98 (29 Sep 2021)
Sequence version 1 (01 Feb 1997)
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Protein

Flap endonuclease 1-B

Gene

fen1-b

Organism
Xenopus laevis (African clawed frog)
Status
Reviewed-Annotation score:

Annotation score:5 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>
-Experimental evidence at protein leveli <p>This indicates the type of evidence that supports the existence of the protein. Note that the 'protein existence' evidence does not give information on the accuracy or correctness of the sequence(s) displayed.<p><a href='/help/protein_existence' target='_top'>More...</a></p>

<p>This section provides any useful information about the protein, mostly biological knowledge.<p><a href='/help/function_section' target='_top'>More...</a></p>Functioni

Structure-specific nuclease with 5'-flap endonuclease and 5'-3' exonuclease activities involved in DNA replication and repair. During DNA replication, cleaves the 5'-overhanging flap structure that is generated by displacement synthesis when DNA polymerase encounters the 5'-end of a downstream Okazaki fragment. It enters the flap from the 5'-end and then tracks to cleave the flap base, leaving a nick for ligation. Also involved in the long patch base excision repair (LP-BER) pathway, by cleaving within the apurinic/apyrimidinic (AP) site-terminated flap. Acts as a genome stabilization factor that prevents flaps from equilibrating into structurs that lead to duplications and deletions. Also possesses 5'-3' exonuclease activity on nicked or gapped double-stranded DNA, and exhibits RNase H activity. Also involved in replication and repair of rDNA and in repairing mitochondrial DNA.

UniRule annotation1 Publication

<p>This subsection of the 'Function' section provides information relevant to cofactors. A cofactor is any non-protein substance required for a protein to be catalytically active. Some cofactors are inorganic, such as the metal atoms zinc, iron, and copper in various oxidation states. Others, such as most vitamins, are organic.<p><a href='/help/cofactor' target='_top'>More...</a></p>Cofactori

Mg2+UniRule annotationNote: Binds 2 magnesium ions per subunit. They probably participate in the reaction catalyzed by the enzyme. May bind an additional third magnesium ion after substrate binding.UniRule annotation

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">Function</a> section indicates at which position the protein binds a given metal ion. The nature of the metal is indicated in the 'Description' field.<p><a href='/help/metal' target='_top'>More...</a></p>Metal bindingi34Magnesium 1UniRule annotation1
<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">Function</a> section describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.<p><a href='/help/binding' target='_top'>More...</a></p>Binding sitei47DNA substrateUniRule annotationBy similarity1
Binding sitei70DNA substrateUniRule annotationBy similarity1
Metal bindingi86Magnesium 1UniRule annotation1
Metal bindingi158Magnesium 1UniRule annotation1
Binding sitei158DNA substrateUniRule annotationBy similarity1
Metal bindingi160Magnesium 1UniRule annotation1
Metal bindingi179Magnesium 2UniRule annotation1
Metal bindingi181Magnesium 2UniRule annotation1
Binding sitei231DNA substrateUniRule annotationBy similarity1
Metal bindingi233Magnesium 2UniRule annotation1
Binding sitei233DNA substrateUniRule annotationBy similarity1

<p>The <a href="http://www.geneontology.org/">Gene Ontology (GO)</a> project provides a set of hierarchical controlled vocabulary split into 3 categories:<p><a href='/help/gene_ontology' target='_top'>More...</a></p>GO - Molecular functioni

GO - Biological processi

<p>UniProtKB Keywords constitute a <a href="http://www.uniprot.org/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='/help/keywords' target='_top'>More...</a></p>Keywordsi

Molecular functionEndonuclease, Exonuclease, Hydrolase, Nuclease
Biological processDNA damage, DNA repair, DNA replication
LigandMagnesium, Metal-binding

<p>This section provides information about the protein and gene name(s) and synonym(s) and about the organism that is the source of the protein sequence.<p><a href='/help/names_and_taxonomy_section' target='_top'>More...</a></p>Names & Taxonomyi

<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">Names and taxonomy</a> section provides an exhaustive list of all names of the protein, from commonly used to obsolete, to allow unambiguous identification of a protein.<p><a href='/help/protein_names' target='_top'>More...</a></p>Protein namesi
Recommended name:
Flap endonuclease 1-BUniRule annotation (EC:3.1.-.-UniRule annotation)
Short name:
FEN-1-BUniRule annotation
Alternative name(s):
Flap structure-specific endonuclease 1-BUniRule annotation
Short name:
xFEN-1b
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">Names and taxonomy</a> section indicates the name(s) of the gene(s) that code for the protein sequence(s) described in the entry. Four distinct tokens exist: 'Name', 'Synonyms', 'Ordered locus names' and 'ORF names'.<p><a href='/help/gene_name' target='_top'>More...</a></p>Gene namesi
Name:fen1-b
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">Names and taxonomy</a> section provides information on the name(s) of the organism that is the source of the protein sequence.<p><a href='/help/organism-name' target='_top'>More...</a></p>OrganismiXenopus laevis (African clawed frog)
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">Names and taxonomy</a> section shows the unique identifier assigned by the NCBI to the source organism of the protein. This is known as the 'taxonomic identifier' or 'taxid'.<p><a href='/help/taxonomic_identifier' target='_top'>More...</a></p>Taxonomic identifieri8355 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">Names and taxonomy</a> section contains the taxonomic hierarchical classification lineage of the source organism. It lists the nodes as they appear top-down in the taxonomic tree, with the more general grouping listed first.<p><a href='/help/taxonomic_lineage' target='_top'>More...</a></p>Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiAmphibiaBatrachiaAnuraPipoideaPipidaeXenopodinaeXenopusXenopus

Organism-specific databases

Xenopus laevis and tropicalis biology and genomics resource

More...
Xenbasei
XB-GENE-6254462, fen1.S

<p>This section provides information on the location and the topology of the mature protein in the cell.<p><a href='/help/subcellular_location_section' target='_top'>More...</a></p>Subcellular locationi

Keywords - Cellular componenti

Mitochondrion, Nucleus

<p>This section describes post-translational modifications (PTMs) and/or processing events.<p><a href='/help/ptm_processing_section' target='_top'>More...</a></p>PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section describes the extent of a polypeptide chain in the mature protein following processing or proteolytic cleavage.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00002444921 – 382Flap endonuclease 1-BAdd BLAST382

<p>This subsection of the <a href="http://www.uniprot.org/help/ptm_processing_section">PTM/processing</a> section describes post-translational modifications (PTMs). This subsection <strong>complements</strong> the information provided at the sequence level or describes modifications for which <strong>position-specific data is not yet available</strong>.<p><a href='/help/post-translational_modification' target='_top'>More...</a></p>Post-translational modificationi

Phosphorylated. Phosphorylation upon DNA damage induces relocalization to the nuclear plasma.UniRule annotation

Keywords - PTMi

Phosphoprotein

<p>This section provides information on the expression of a gene at the mRNA or protein level in cells or in tissues of multicellular organisms.<p><a href='/help/expression_section' target='_top'>More...</a></p>Expressioni

<p>This subsection of the 'Expression' section provides information on the expression of the gene product at various stages of a cell, tissue or organism development. By default, the information is derived from experiments at the mRNA level, unless specified 'at the protein level'.<p><a href='/help/developmental_stage' target='_top'>More...</a></p>Developmental stagei

First expressed at a low level in stage II oocytes. Expression increases dramatically from oocyte stages III to V (at protein level). Also expressed in embryos.1 Publication

<p>This section provides information on the quaternary structure of a protein and on interaction(s) with other proteins or protein complexes.<p><a href='/help/interaction_section' target='_top'>More...</a></p>Interactioni

<p>This subsection of the <a href="http://www.uniprot.org/help/interaction_section">'Interaction'</a> section provides information about the protein quaternary structure and interaction(s) with other proteins or protein complexes (with the exception of physiological receptor-ligand interactions which are annotated in the <a href="http://www.uniprot.org/help/function_section">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

Interacts with PCNA. Three molecules of fen1 bind to one PCNA trimer with each molecule binding to one PCNA monomer. PCNA stimulates the nuclease activity without altering cleavage specificity.

UniRule annotation

<p>This section provides information on the tertiary and secondary structure of a protein.<p><a href='/help/structure_section' target='_top'>More...</a></p>Structurei

3D structure databases

SWISS-MODEL Repository - a database of annotated 3D protein structure models

More...
SMRi
P70054

Database of comparative protein structure models

More...
ModBasei
Search...

<p>This section provides information on sequence similarities with other proteins and the domain(s) present in a protein.<p><a href='/help/family_and_domains_section' target='_top'>More...</a></p>Family & Domainsi

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Family and Domains' section describes a region of interest that cannot be described in other subsections.<p><a href='/help/region' target='_top'>More...</a></p>Regioni1 – 104N-domainSequence analysisAdd BLAST104
Regioni122 – 253I-domainSequence analysisAdd BLAST132
Regioni336 – 344Interaction with PCNAUniRule annotation9
Regioni352 – 382DisorderedSequence analysisAdd BLAST31

Compositional bias

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Family and Domains' section describes the position of regions of compositional bias within the protein and the particular type of amino acids that are over-represented within those regions.<p><a href='/help/compbias' target='_top'>More...</a></p>Compositional biasi352 – 366Basic and acidic residuesSequence analysisAdd BLAST15

<p>This subsection of the 'Family and domains' section provides information about the sequence similarity with other proteins.<p><a href='/help/sequence_similarities' target='_top'>More...</a></p>Sequence similaritiesi

Belongs to the XPG/RAD2 endonuclease family. FEN1 subfamily.UniRule annotationBy similarity

Phylogenomic databases

Identification of Orthologs from Complete Genome Data

More...
OMAi
GSQDYDS

Database of Orthologous Groups

More...
OrthoDBi
1094524at2759

Family and domain databases

HAMAP database of protein families

More...
HAMAPi
MF_00614, Fen, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR036279, 5-3_exonuclease_C_sf
IPR023426, Flap_endonuc
IPR008918, HhH2
IPR029060, PIN-like_dom_sf
IPR006086, XPG-I_dom
IPR006084, XPG/Rad2
IPR019974, XPG_CS
IPR006085, XPG_DNA_repair_N

The PANTHER Classification System

More...
PANTHERi
PTHR11081, PTHR11081, 1 hit

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF00867, XPG_I, 1 hit
PF00752, XPG_N, 1 hit

Protein Motif fingerprint database; a protein domain database

More...
PRINTSi
PR00853, XPGRADSUPER

Simple Modular Architecture Research Tool; a protein domain database

More...
SMARTi
View protein in SMART
SM00279, HhH2, 1 hit
SM00484, XPGI, 1 hit
SM00485, XPGN, 1 hit

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF47807, SSF47807, 1 hit
SSF88723, SSF88723, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS00841, XPG_1, 1 hit

<p>This section displays by default the canonical protein sequence and upon request all isoforms described in the entry. It also includes information pertinent to the sequence(s), including <a href="http://www.uniprot.org/help/sequence_length">length</a> and <a href="http://www.uniprot.org/help/sequences">molecular weight</a>. The information is filed in different subsections. The current subsections and their content are listed below:<p><a href='/help/sequences_section' target='_top'>More...</a></p>Sequencei

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences_section">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical_and_isoforms">canonical sequence</a> displayed by default in the entry is complete or not.<p><a href='/help/sequence_status' target='_top'>More...</a></p>Sequence statusi: Complete.

P70054-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MGIHGLAKLI ADVAPAAIKE HDIKSYFGRK VAVDASMCIY QFLIAVRQDG
60 70 80 90 100
NMLQNEEGET TSHLMGMFYR TIRMLEHGIK PVYVFDGKPP QMKSGELAKR
110 120 130 140 150
SERRAEAEKL LEAAEEAGEV ENIEKFNKRL VKVTKQHNEE CKKLLSLMGI
160 170 180 190 200
PYVDAPCEAE ATCAALVKAG KVYAAATEDM DALTFGTPVL LRHLTASEAK
210 220 230 240 250
KLPIQEFHLN RVFQDIGINH EQFVDLCILL GSDYCETIRG IGPKRAIDLI
260 270 280 290 300
RQHKTIEEII DNIDLKKYPI PENWLHKEAR QLFLEPEVID ADITELKWTE
310 320 330 340 350
PDEEGLVAFM CGEKQFSEDR IRNGAKKLAK NRQGSTQGRL DDFFKVTGSI
360 370 380
SSTKRKEVES KGSTKKKSKT GGTPAGKFKR GK
Length:382
Mass (Da):42,865
Last modified:February 1, 1997 - v1
<p>The checksum is a form of redundancy check that is calculated from the sequence. It is useful for tracking sequence updates.</p> <p>It should be noted that while, in theory, two different sequences could have the same checksum value, the likelihood that this would happen is extremely low.</p> <p>However UniProtKB may contain entries with identical sequences in case of multiple genes (paralogs).</p> <p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64) using the generator polynomial: x<sup>64</sup> + x<sup>4</sup> + x<sup>3</sup> + x + 1. The algorithm is described in the ISO 3309 standard. </p> <p class="publication">Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.<br /> <strong>Cyclic redundancy and other checksums</strong><br /> <a href="http://www.nrbook.com/b/bookcpdf.php">Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993)</a>)</p> Checksum:i1C648936A232D460
GO

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...
EMBLi

GenBank nucleotide sequence database

More...
GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...
DDBJi
Links Updated
U68141 mRNA Translation: AAB08478.1
BC169390 mRNA Translation: AAI69390.1
BC169394 mRNA Translation: AAI69394.1

NCBI Reference Sequences

More...
RefSeqi
NP_001080984.1, NM_001087515.1

Genome annotation databases

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
394311

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
xla:394311

<p>This section provides links to proteins that are similar to the protein sequence(s) described in this entry at different levels of sequence identity thresholds (100%, 90% and 50%) based on their membership in UniProt Reference Clusters (<a href="http://www.uniprot.org/help/uniref">UniRef</a>).<p><a href='/help/similar_proteins_section' target='_top'>More...</a></p>Similar proteinsi

<p>This section is used to point to information related to entries and found in data collections other than UniProtKB.<p><a href='/help/cross_references_section' target='_top'>More...</a></p>Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
U68141 mRNA Translation: AAB08478.1
BC169390 mRNA Translation: AAI69390.1
BC169394 mRNA Translation: AAI69394.1
RefSeqiNP_001080984.1, NM_001087515.1

3D structure databases

SMRiP70054
ModBaseiSearch...

Genome annotation databases

GeneIDi394311
KEGGixla:394311

Organism-specific databases

Comparative Toxicogenomics Database

More...
CTDi
394311
XenbaseiXB-GENE-6254462, fen1.S

Phylogenomic databases

OMAiGSQDYDS
OrthoDBi1094524at2759

Family and domain databases

HAMAPiMF_00614, Fen, 1 hit
InterProiView protein in InterPro
IPR036279, 5-3_exonuclease_C_sf
IPR023426, Flap_endonuc
IPR008918, HhH2
IPR029060, PIN-like_dom_sf
IPR006086, XPG-I_dom
IPR006084, XPG/Rad2
IPR019974, XPG_CS
IPR006085, XPG_DNA_repair_N
PANTHERiPTHR11081, PTHR11081, 1 hit
PfamiView protein in Pfam
PF00867, XPG_I, 1 hit
PF00752, XPG_N, 1 hit
PRINTSiPR00853, XPGRADSUPER
SMARTiView protein in SMART
SM00279, HhH2, 1 hit
SM00484, XPGI, 1 hit
SM00485, XPGN, 1 hit
SUPFAMiSSF47807, SSF47807, 1 hit
SSF88723, SSF88723, 1 hit
PROSITEiView protein in PROSITE
PS00841, XPG_1, 1 hit

MobiDB: a database of protein disorder and mobility annotations

More...
MobiDBi
Search...

<p>This section provides general information on the entry.<p><a href='/help/entry_information_section' target='_top'>More...</a></p>Entry informationi

<p>This subsection of the 'Entry information' section provides a mnemonic identifier for a UniProtKB entry, but it is not a stable identifier. Each reviewed entry is assigned a unique entry name upon integration into UniProtKB/Swiss-Prot.<p><a href='/help/entry_name' target='_top'>More...</a></p>Entry nameiFEN1B_XENLA
<p>This subsection of the 'Entry information' section provides one or more accession number(s). These are stable identifiers and should be used to cite UniProtKB entries. Upon integration into UniProtKB, each entry is assigned a unique accession number, which is called 'Primary (citable) accession number'.<p><a href='/help/accession_numbers' target='_top'>More...</a></p>AccessioniPrimary (citable) accession number: P70054
Secondary accession number(s): B7ZPB1
<p>This subsection of the 'Entry information' section shows the date of integration of the entry into UniProtKB, the date of the last sequence update and the date of the last annotation modification ('Last modified'). The version number for both the entry and the <a href="http://www.uniprot.org/help/canonical_and_isoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: June 27, 2006
Last sequence update: February 1, 1997
Last modified: September 29, 2021
This is version 98 of the entry and version 1 of the sequence. See complete history.
<p>This subsection of the 'Entry information' section indicates whether the entry has been manually annotated and reviewed by UniProtKB curators or not, in other words, if the entry belongs to the Swiss-Prot section of UniProtKB (<strong>reviewed</strong>) or to the computer-annotated TrEMBL section (<strong>unreviewed</strong>).<p><a href='/help/entry_status' target='_top'>More...</a></p>Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program

<p>This section contains any relevant information that doesn't fit in any other defined sections<p><a href='/help/miscellaneous_section' target='_top'>More...</a></p>Miscellaneousi

Documents

  1. SIMILARITY comments
    Index of protein domains and families
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