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Protein

Endonuclease 4

Gene

nfo

Organism
Escherichia coli (strain K12)
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

Endonuclease IV plays a role in DNA repair. It cleaves phosphodiester bonds at apurinic or apyrimidinic sites (AP sites) to produce new 5'-ends that are base-free deoxyribose 5-phosphate residues. It preferentially attacks modified AP sites created by bleomycin and neocarzinostatin.

<p>This subsection of the <a href="http://www.uniprot.org/help/function_section">Function</a> section describes the catalytic activity of an enzyme, i.e. a chemical reaction that the enzyme catalyzes.<p><a href='/help/catalytic_activity' target='_top'>More...</a></p>Catalytic activityi

  • Endonucleolytic cleavage to 5'-phosphooligonucleotide end-products. EC:3.1.21.2

<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

Zn2+, Mn2+Note: Binds 3 Zn2+ ions. Can also bind Mn2+ ions.

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the ‘Function’ 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 bindingi69Zinc 11
Metal bindingi109Zinc 11
Metal bindingi145Zinc 11
Metal bindingi145Zinc 21
Metal bindingi179Zinc 21
Metal bindingi182Zinc 31
Metal bindingi216Zinc 21
Metal bindingi229Zinc 31
Metal bindingi231Zinc 31
Metal bindingi261Zinc 21

<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, Hydrolase, Nuclease
Biological processDNA damage, DNA repair
LigandManganese, Metal-binding, Zinc

Enzyme and pathway databases

BioCyc Collection of Pathway/Genome Databases

More...
BioCyci
EcoCyc:EG10651-MONOMER
MetaCyc:EG10651-MONOMER

BRENDA Comprehensive Enzyme Information System

More...
BRENDAi
3.1.21.2 2026

<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:
Endonuclease 4 (EC:3.1.21.2)
Alternative name(s):
Endodeoxyribonuclease IV
Endonuclease IV
<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:nfo
Ordered Locus Names:b2159, JW2146
<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>OrganismiEscherichia coli (strain K12)
<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 identifieri83333 [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 lineageiBacteriaProteobacteriaGammaproteobacteriaEnterobacteralesEnterobacteriaceaeEscherichia
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">Names and taxonomy</a> section is present for entries that are part of a <a href="http://www.uniprot.org/proteomes">proteome</a>, i.e. of a set of proteins thought to be expressed by organisms whose genomes have been completely sequenced.<p><a href='/help/proteomes_manual' target='_top'>More...</a></p>Proteomesi
  • UP000000318 <p>A UniProt <a href="http://www.uniprot.org/manual/proteomes_manual">proteome</a> can consist of several components. <br></br>The component name refers to the genomic component encoding a set of proteins.<p><a href='/help/proteome_component' target='_top'>More...</a></p> Componenti: Chromosome
  • UP000000625 Componenti: Chromosome

Organism-specific databases

Escherichia coli strain K12 genome database

More...
EcoGenei
EG10651 nfo

<p>This section provides information on the disease(s) and phenotype(s) associated with a protein.<p><a href='/help/pathology_and_biotech_section' target='_top'>More...</a></p>Pathology & Biotechi

Chemistry databases

ChEMBL database of bioactive drug-like small molecules

More...
ChEMBLi
CHEMBL1293285

<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.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00001908381 – 285Endonuclease 4Add BLAST285

Proteomic databases

PaxDb, a database of protein abundance averages across all three domains of life

More...
PaxDbi
P0A6C1

PRoteomics IDEntifications database

More...
PRIDEi
P0A6C1

<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 reports the experimentally proven effects of inducers and repressors (usually chemical compounds or environmental factors) on the level of protein (or mRNA) expression (up-regulation, down-regulation, constitutive expression).<p><a href='/help/induction' target='_top'>More...</a></p>Inductioni

Endonuclease IV is induced by agents which generate superoxide radical anions.

<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

Monomer.

Protein-protein interaction databases

The Biological General Repository for Interaction Datasets (BioGrid)

More...
BioGridi
4261799, 26 interactors

Database of interacting proteins

More...
DIPi
DIP-47966N

Protein interaction database and analysis system

More...
IntActi
P0A6C1, 10 interactors

STRING: functional protein association networks

More...
STRINGi
316385.ECDH10B_2316

<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

Secondary structure

1285
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details

3D structure databases

Protein Model Portal of the PSI-Nature Structural Biology Knowledgebase

More...
ProteinModelPortali
P0A6C1

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

More...
SMRi
P0A6C1

Database of comparative protein structure models

More...
ModBasei
Search...

MobiDB: a database of protein disorder and mobility annotations

More...
MobiDBi
Search...

Miscellaneous databases

Relative evolutionary importance of amino acids within a protein sequence

More...
EvolutionaryTracei
P0A6C1

<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

<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 AP endonuclease 2 family.Curated

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...
eggNOGi
ENOG4105EFU Bacteria
COG0648 LUCA

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...
HOGENOMi
HOG000224893

InParanoid: Eukaryotic Ortholog Groups

More...
InParanoidi
P0A6C1

KEGG Orthology (KO)

More...
KOi
K01151

Database for complete collections of gene phylogenies

More...
PhylomeDBi
P0A6C1

Family and domain databases

Conserved Domains Database

More...
CDDi
cd00019 AP2Ec, 1 hit

HAMAP database of protein families

More...
HAMAPi
MF_00152 Nfo, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR001719 AP_endonuc_2
IPR018246 AP_endonuc_F2_Zn_BS
IPR036237 Xyl_isomerase-like_sf
IPR013022 Xyl_isomerase-like_TIM-brl

The PANTHER Classification System

More...
PANTHERi
PTHR21445 PTHR21445, 1 hit

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF01261 AP_endonuc_2, 1 hit

Simple Modular Architecture Research Tool; a protein domain database

More...
SMARTi
View protein in SMART
SM00518 AP2Ec, 1 hit

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF51658 SSF51658, 1 hit

TIGRFAMs; a protein family database

More...
TIGRFAMsi
TIGR00587 nfo, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS00729 AP_NUCLEASE_F2_1, 1 hit
PS00730 AP_NUCLEASE_F2_2, 1 hit
PS00731 AP_NUCLEASE_F2_3, 1 hit
PS51432 AP_NUCLEASE_F2_4, 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>.<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.

P0A6C1-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MKYIGAHVSA AGGLANAAIR AAEIDATAFA LFTKNQRQWR AAPLTTQTID
60 70 80 90 100
EFKAACEKYH YTSAQILPHD SYLINLGHPV TEALEKSRDA FIDEMQRCEQ
110 120 130 140 150
LGLSLLNFHP GSHLMQISEE DCLARIAESI NIALDKTQGV TAVIENTAGQ
160 170 180 190 200
GSNLGFKFEH LAAIIDGVED KSRVGVCIDT CHAFAAGYDL RTPAECEKTF
210 220 230 240 250
ADFARTVGFK YLRGMHLNDA KSTFGSRVDR HHSLGEGNIG HDAFRWIMQD
260 270 280
DRFDGIPLIL ETINPDIWAE EIAWLKAQQT EKAVA
Length:285
Mass (Da):31,480
Last modified:June 7, 2005 - 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:iEAAE5861E54C47FD
GO

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the ‘Sequence’ section reports difference(s) between the canonical sequence (displayed by default in the entry) and the different sequence submissions merged in the entry. These various submissions may originate from different sequencing projects, different types of experiments, or different biological samples. Sequence conflicts are usually of unknown origin.<p><a href='/help/conflict' target='_top'>More...</a></p>Sequence conflicti10A → R in AAA24216 (PubMed:2460435).Curated1
Sequence conflicti273A → T in AAA60529 (Ref. 2) Curated1

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
M22591 Genomic DNA Translation: AAA24216.1
U00007 Genomic DNA Translation: AAA60529.1
U00096 Genomic DNA Translation: AAC75220.1
AP009048 Genomic DNA Translation: BAE76636.1

Protein sequence database of the Protein Information Resource

More...
PIRi
F64984 NDEC4

NCBI Reference Sequences

More...
RefSeqi
NP_416664.1, NC_000913.3
WP_000873894.1, NZ_LN832404.1

Genome annotation databases

Ensembl bacterial and archaeal genome annotation project

More...
EnsemblBacteriai
AAC75220; AAC75220; b2159
BAE76636; BAE76636; BAE76636

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
946669

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
ecj:JW2146
eco:b2159

Pathosystems Resource Integration Center (PATRIC)

More...
PATRICi
fig|1411691.4.peg.80

<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
M22591 Genomic DNA Translation: AAA24216.1
U00007 Genomic DNA Translation: AAA60529.1
U00096 Genomic DNA Translation: AAC75220.1
AP009048 Genomic DNA Translation: BAE76636.1
PIRiF64984 NDEC4
RefSeqiNP_416664.1, NC_000913.3
WP_000873894.1, NZ_LN832404.1

3D structure databases

Select the link destinations:

Protein Data Bank Europe

More...
PDBei

Protein Data Bank RCSB

More...
RCSB PDBi

Protein Data Bank Japan

More...
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1QTWX-ray1.02A1-285[»]
1QUMX-ray1.55A1-285[»]
2NQ9X-ray1.45A1-285[»]
2NQHX-ray1.10A1-285[»]
2NQJX-ray2.45A/B1-285[»]
4K1GX-ray1.90A/B1-285[»]
ProteinModelPortaliP0A6C1
SMRiP0A6C1
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

BioGridi4261799, 26 interactors
DIPiDIP-47966N
IntActiP0A6C1, 10 interactors
STRINGi316385.ECDH10B_2316

Chemistry databases

ChEMBLiCHEMBL1293285

Proteomic databases

PaxDbiP0A6C1
PRIDEiP0A6C1

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsemblBacteriaiAAC75220; AAC75220; b2159
BAE76636; BAE76636; BAE76636
GeneIDi946669
KEGGiecj:JW2146
eco:b2159
PATRICifig|1411691.4.peg.80

Organism-specific databases

EchoBASE - an integrated post-genomic database for E. coli

More...
EchoBASEi
EB0645
EcoGeneiEG10651 nfo

Phylogenomic databases

eggNOGiENOG4105EFU Bacteria
COG0648 LUCA
HOGENOMiHOG000224893
InParanoidiP0A6C1
KOiK01151
PhylomeDBiP0A6C1

Enzyme and pathway databases

BioCyciEcoCyc:EG10651-MONOMER
MetaCyc:EG10651-MONOMER
BRENDAi3.1.21.2 2026

Miscellaneous databases

EvolutionaryTraceiP0A6C1

Protein Ontology

More...
PROi
PR:P0A6C1

Family and domain databases

CDDicd00019 AP2Ec, 1 hit
HAMAPiMF_00152 Nfo, 1 hit
InterProiView protein in InterPro
IPR001719 AP_endonuc_2
IPR018246 AP_endonuc_F2_Zn_BS
IPR036237 Xyl_isomerase-like_sf
IPR013022 Xyl_isomerase-like_TIM-brl
PANTHERiPTHR21445 PTHR21445, 1 hit
PfamiView protein in Pfam
PF01261 AP_endonuc_2, 1 hit
SMARTiView protein in SMART
SM00518 AP2Ec, 1 hit
SUPFAMiSSF51658 SSF51658, 1 hit
TIGRFAMsiTIGR00587 nfo, 1 hit
PROSITEiView protein in PROSITE
PS00729 AP_NUCLEASE_F2_1, 1 hit
PS00730 AP_NUCLEASE_F2_2, 1 hit
PS00731 AP_NUCLEASE_F2_3, 1 hit
PS51432 AP_NUCLEASE_F2_4, 1 hit

ProtoNet; Automatic hierarchical classification of proteins

More...
ProtoNeti
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 nameiEND4_ECOLI
<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: P0A6C1
Secondary accession number(s): P12638, P78086, Q2MAS0
<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 7, 2005
Last sequence update: June 7, 2005
Last modified: December 5, 2018
This is version 120 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 programProkaryotic 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

Keywords - Technical termi

3D-structure, Complete proteome, Reference proteome

Documents

  1. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  2. SIMILARITY comments
    Index of protein domains and families
  3. Escherichia coli
    Escherichia coli (strain K12): entries and cross-references to EcoGene
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