N4BP2

gene
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Also known as B3BP

Summary

N4BP2 (NEDD4 binding protein 2, HGNC:29851) is a protein-coding gene on chromosome 4p14, encoding NEDD4-binding protein 2 (Q86UW6). Has 5’-polynucleotide kinase and nicking endonuclease activity.

This gene encodes a protein containing a polynucleotide kinase domain (PNK) near the N-terminal region, and a Small MutS Related (Smr) domain near the C-terminal region. The encoded protein can bind to both B-cell leukemia/lymphoma 3 (BCL-3) and neural precursor cell expressed, developmentally downregulated 4, (Nedd4) proteins. This protein binds and hydrolyzes ATP, may function as a 5’-polynucleotide kinase, and has the capacity to be a ubiquitylation substrate. This protein may play a role in transcription-coupled DNA repair or genetic recombination. Alternative splicing results in multiple transcript variants encoding different isoforms.

Source: NCBI Gene 55728 — RefSeq curated summary.

At a glance

  • GWAS associations: 1
  • Clinical variants (ClinVar): 246 total
  • Cancer driver (intOGen): loss-of-function (tumor-suppressor-like) across 3 cancer types
  • MANE Select transcript: NM_018177

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:29851
Approved symbolN4BP2
NameNEDD4 binding protein 2
Location4p14
Locus typegene with protein product
StatusApproved
AliasesB3BP
Ensembl geneENSG00000078177
Ensembl biotypeprotein_coding
OMIM619139
Entrez55728

Gene structure

Transcript identifiers

Ensembl transcripts: 9 — 7 protein_coding, 2 nonsense_mediated_decay

ENST00000261435, ENST00000511480, ENST00000513269, ENST00000515550, ENST00000706658, ENST00000913248, ENST00000913249, ENST00000913250, ENST00000913251

RefSeq mRNA: 2 — MANE Select: NM_018177 NM_001318359, NM_018177

CCDS: CCDS3457

Canonical transcript exons

ENST00000261435 — 18 exons

ExonStartEnd
ENSE000010773704009722740097569
ENSE000014899114007345540073551
ENSE000039964904010690040107024
ENSE000039964934010207540103218
ENSE000039964944012613440126330
ENSE000039964954013180140131919
ENSE000039964964011343240113508
ENSE000039964974015419240158252
ENSE000039964994015278040152903
ENSE000039965004011208440112172
ENSE000039965014014463240144800
ENSE000039965024011993240122309
ENSE000039965034012416040124205
ENSE000039965044013694440137082
ENSE000039965054011786940118024
ENSE000039965064014267340142861
ENSE000039965074012312740123212
ENSE000039965084005685040057030

Expression profiles

Bgee: expression breadth ubiquitous, 227 present calls, max score 94.76.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 10.9728 / max 274.0797, expressed in 1658 samples.

FANTOM5 promoters (1 alternative TSS)

Promoter IDTPM avgSamples expressed
4739510.97281658

Top tissues by expression

248 total, by Bgee expression score (0-100, higher = more expressed):

TissueAnatomy IDExpression scoreQuality
tibiaUBERON:000097994.76gold quality
epithelial cell of pancreasCL:000008393.17gold quality
amniotic fluidUBERON:000017385.75gold quality
primordial germ cell in gonadCL:0000670 ∩ UBERON:000099185.24gold quality
secondary oocyteCL:000065585.04gold quality
corpus epididymisUBERON:000435984.69gold quality
thymusUBERON:000237084.00gold quality
male germ line stem cell (sensu Vertebrata) in testisCL:0000089 ∩ UBERON:000047383.84gold quality
placentaUBERON:000198783.63gold quality
calcaneal tendonUBERON:000370183.20gold quality
parietal pleuraUBERON:000240082.66gold quality
bone marrow cellCL:000209282.44gold quality
visceral pleuraUBERON:000240182.24gold quality
oocyteCL:000002381.87gold quality
oral cavityUBERON:000016781.40gold quality
oviduct epitheliumUBERON:000480481.08gold quality
ventricular zoneUBERON:000305380.63gold quality
palpebral conjunctivaUBERON:000181280.62gold quality
mucosa of paranasal sinusUBERON:000503080.55gold quality
adrenal tissueUBERON:001830380.49gold quality
caput epididymisUBERON:000435880.47gold quality
ganglionic eminenceUBERON:000402380.29gold quality
bone marrowUBERON:000237179.75gold quality
germinal epithelium of ovaryUBERON:000130479.64gold quality
pigmented layer of retinaUBERON:000178279.54gold quality
retinaUBERON:000096679.52gold quality
bronchial epithelial cellCL:000232879.21gold quality
superficial temporal arteryUBERON:000161479.17gold quality
tonsilUBERON:000237279.15gold quality
esophagus squamous epitheliumUBERON:000692078.98gold quality

Single-cell (SCXA)

Detected in 1 experiment(s), a significant marker in 1.

ExperimentMarker?Max mean expression
E-ANND-3yes6.36

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

216 targeting N4BP2, top 30 by miRDB confidence (max_score; target_count = how many genes the miRNA targets in total — lower means more specific):

miRNAMax scoreAvg scoremiRNA target_count
HSA-MIR-3163100.0077.238605
HSA-MIR-5692B100.0071.322622
HSA-MIR-5692C100.0071.322622
HSA-LET-7A-3P100.0074.033932
HSA-LET-7B-3P100.0074.083913
HSA-MIR-98-3P100.0074.083907
HSA-LET-7F-1-3P100.0074.023928
HSA-MIR-3120-5P100.0065.56965
HSA-MIR-5692A100.0074.406850
HSA-MIR-3613-3P100.0076.367965
HSA-MIR-200B-3P100.0073.312693
HSA-MIR-200C-3P100.0073.352685
HSA-MIR-429100.0073.442698
HSA-MIR-518D-5P100.0067.51979
HSA-MIR-518E-5P100.0067.66954
HSA-MIR-518F-5P100.0067.51979
HSA-MIR-519A-5P100.0067.66954
HSA-MIR-519B-5P100.0067.66954
HSA-MIR-519C-5P100.0067.66954
HSA-MIR-520C-5P100.0067.51979
HSA-MIR-522-5P100.0067.66954
HSA-MIR-523-5P100.0067.66954
HSA-MIR-526A-5P100.0067.51979
HSA-MIR-4262100.0073.263931
HSA-MIR-340-5P100.0072.504437
HSA-MIR-30A-5P100.0076.313233
HSA-MIR-30B-5P100.0076.293248
HSA-MIR-30C-5P100.0076.293248
HSA-MIR-30D-5P100.0076.323233
HSA-MIR-30E-5P100.0076.323242

Literature-anchored findings (GeneRIF, showing 5)

  • B3BP is a 5’-polynucleotide kinase (PMID:12730195)
  • These data suggest that haplotype blocks ATTA and GTTG of N4BP2 is correlation with the risk of sporadic nasopharyngeal carcinoma in the Southern Chinese population. (PMID:17626640)
  • The solution structure of the functionally active Smr domain of the Bcl3-binding protein (also known as Nedd4-binding protein 2), a protein with unknown function that lacks other domains present in MutS proteins, is determined. (PMID:18804481)
  • the N-terminal extended region of the Smr domain in the native B3bp may function as a regulatory region for the nicking endonuclease (PMID:22072629)
  • We found that a burden of low-frequency coding variants in N4BP2, CDSN, PRTG, and AHRR were associated with increased risk of Nonsyndromic cleft lip with or without cleft palate (NSCL/P) . Low-frequency variants in other genes were associated with decreased risk of NSCL/P. These results demonstrate that low-frequency variants contribute to the genetic etiology of NSCL/P (PMID:28425186)

Cross-species orthologs

2 orthologs

OrganismSymbolGene ID
mus_musculusN4bp2ENSMUSG00000037795
rattus_norvegicusN4bp2ENSRNOG00000027152

Paralogs (2): N4BP2L1 (ENSG00000139597), N4BP2L2 (ENSG00000244754)

Protein

Protein identifiers

NEDD4-binding protein 2Q86UW6 (reviewed: Q86UW6)

Alternative names: BCL-3-binding protein

All UniProt accessions (4): Q86UW6, D6R9J2, D6RC09, H0YA93

UniProt curated annotations — full annotation on UniProt →

Function. Has 5’-polynucleotide kinase and nicking endonuclease activity. May play a role in DNA repair or recombination. May play a role in the non-stop mRNA decay pathway (NSD), which specifically targets and degrades mRNAs that lack a proper stop codon.

Subunit / interactions. Binds NEDD4. Binds BCL3 and CREBBP.

Subcellular location. Cytoplasm.

Post-translational modifications. Ubiquitinated; this targets the protein for degradation by the proteasome.

Domain organisation. The Smr domain has nicking endonuclease activity, but no significant double strand cleavage or exonuclease activity.

Isoforms (2)

UniProt IDNamesCanonical?
Q86UW6-11yes
Q86UW6-22

RefSeq proteins (2): NP_001305288, NP_060647* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR002625Smr_domDomain
IPR003892CUEDomain
IPR009060UBA-like_sfHomologous_superfamily
IPR013899DUF1771Domain
IPR027417P-loop_NTPaseHomologous_superfamily
IPR036063Smr_dom_sfHomologous_superfamily
IPR041801N4BP2_CUEDomain
IPR052772Endo/PolyKinase_Domain-ProteinFamily
IPR056718DUF7816Domain
IPR056719DUF7817Domain
IPR056720DUF7818Domain

Pfam: PF01713, PF08590, PF13671, PF25124, PF25125, PF25126

UniProt features (40 total): sequence conflict 7, region of interest 7, sequence variant 5, strand 5, helix 4, compositionally biased region 3, domain 2, coiled-coil region 2, modified residue 2, chain 1, binding site 1, splice variant 1

Structure

Experimental structures (PDB)

4 structures.

PDBMethodResolution (Å)
3FAUX-RAY DIFFRACTION1.9
3BHBX-RAY DIFFRACTION2.2
2D9ISOLUTION NMR
2VKCSOLUTION NMR

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q86UW6-F149.360.16

Functional residue map

Curated UniProt residues grouped by drug-discovery relevance — catalytic, ligand-binding, modification, and mutation-validated positions. Source: UniProtKB sequence features.

Ligand- & substrate-binding residues (1): 447–454

Post-translational modifications (2): 906, 1210

Function

Pathways and Gene Ontology

Reactome pathways

0 pathways

MSigDB gene sets: 193 (showing top): GSE18804_SPLEEN_MACROPHAGE_VS_BRAIN_TUMORAL_MACROPHAGE_DN, GOMF_ENDONUCLEASE_ACTIVITY, GOMF_NUCLEASE_ACTIVITY, GOBP_MACROMOLECULE_CATABOLIC_PROCESS, KAUFFMANN_DNA_REPAIR_GENES, MODULE_239, ZHANG_BREAST_CANCER_PROGENITORS_UP, PITX2_Q2, GOMF_DNA_ENDONUCLEASE_ACTIVITY, SENESE_HDAC3_TARGETS_DN, NAKAMURA_TUMOR_ZONE_PERIPHERAL_VS_CENTRAL_UP, LEE_RECENT_THYMIC_EMIGRANT, GOBP_DNA_METABOLIC_PROCESS, GOMF_UBIQUITIN_LIKE_PROTEIN_BINDING, NUYTTEN_NIPP1_TARGETS_DN

GO Biological Process (2): nuclear-transcribed mRNA catabolic process, non-stop decay (GO:0070481), DNA metabolic process (GO:0006259)

GO Molecular Function (8): endonuclease activity (GO:0004519), DNA endonuclease activity (GO:0004520), ATP binding (GO:0005524), hydrolase activity (GO:0016787), ubiquitin binding (GO:0043130), ATP-dependent polydeoxyribonucleotide 5’-hydroxyl-kinase activity (GO:0046404), nucleotide binding (GO:0000166), protein binding (GO:0005515)

GO Cellular Component (2): cytosol (GO:0005829), cytoplasm (GO:0005737)

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
cellular anatomical structure2
nuclear-transcribed mRNA catabolic process1
nucleic acid metabolic process1
nuclease activity1
endonuclease activity1
DNA nuclease activity1
adenyl ribonucleotide binding1
purine ribonucleoside triphosphate binding1
catalytic activity1
ubiquitin-like protein binding1
ATP-dependent polynucleotide 5’-hydroxyl-kinase activity1
nucleoside phosphate binding1
heterocyclic compound binding1
binding1
cytoplasm1
intracellular anatomical structure1

Protein interactions and networks

STRING

912 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
N4BP2PLXNA4Q9HCM2591
N4BP2BCL3P20749558
N4BP2ZNF567Q8N184543
N4BP2KLHL5Q96PQ7489
N4BP2CHD9Q3L8U1466
N4BP2TMEM156Q8N614453
N4BP2RBM47A0AV96450
N4BP2SPDYE16A6NNV3447
N4BP2A0A0J9YYB4A0A0J9YYB4441
N4BP2LIASO43766439
N4BP2PDE10AQ9Y233439
N4BP2PDS5AQ29RF7437
N4BP2ZWILCHQ9H900425
N4BP2BCL2P10415416
N4BP2ETFBP38117413

IntAct

43 interactions, top by confidence:

ABTypeScore
DYNLL1BLTP3Bpsi-mi:“MI:0914”(association)0.730
DYNLL2BLTP3Bpsi-mi:“MI:0914”(association)0.640
SF3B1SAP18psi-mi:“MI:0914”(association)0.640
FAM136ARBFOX3psi-mi:“MI:0914”(association)0.640
FAM98AHERC2psi-mi:“MI:0914”(association)0.640
RACK1RIOK3psi-mi:“MI:0914”(association)0.640
DISC1AP4M1psi-mi:“MI:0914”(association)0.530
FAM136APIK3C2Apsi-mi:“MI:0914”(association)0.530
N4BP2PLECpsi-mi:“MI:0915”(physical association)0.400
CEP63CIBAR1psi-mi:“MI:0914”(association)0.350
RTCBMCRIP1psi-mi:“MI:0914”(association)0.350
SF3B3ATXN7psi-mi:“MI:0914”(association)0.350
VPS35KIF2Apsi-mi:“MI:0914”(association)0.350
hspa1a_hspa1b_human-1SHTN1psi-mi:“MI:0914”(association)0.350
DUSP16MEIOCpsi-mi:“MI:0914”(association)0.350
SNAPC4PIK3C2Apsi-mi:“MI:0914”(association)0.350
NAA11DVL2psi-mi:“MI:0914”(association)0.350
CCT8L2DVL2psi-mi:“MI:0914”(association)0.350
NPAS1CIBAR1psi-mi:“MI:0914”(association)0.350
FAM98ACASC3psi-mi:“MI:0914”(association)0.350
NPHP4ARHGAP32psi-mi:“MI:0914”(association)0.350
RPGRIP1LILVBLpsi-mi:“MI:2364”(proximity)0.270
HOOK2SEC16Apsi-mi:“MI:2364”(proximity)0.270
YWHAGE2F8psi-mi:“MI:2364”(proximity)0.270
AGGF1BLTP3Bpsi-mi:“MI:2364”(proximity)0.270

BioGRID (104): N4BP2 (Proximity Label-MS), N4BP2 (Affinity Capture-MS), N4BP2 (Affinity Capture-MS), CREBBP (Affinity Capture-Western), N4BP2 (Two-hybrid), N4BP2 (Affinity Capture-MS), N4BP2 (Affinity Capture-MS), N4BP2 (Affinity Capture-RNA), N4BP2 (Affinity Capture-Western), BCL3 (Reconstituted Complex), N4BP2 (Proximity Label-MS), N4BP2 (Proximity Label-MS), N4BP2 (Proximity Label-MS), N4BP2 (Proximity Label-MS), N4BP2 (Proximity Label-MS)

ESM2 similar proteins: A1L2H3, A2AKX3, A5D8S0, B0S6S9, D3Z987, E1BC15, O43303, O60673, O95405, P56715, Q03188, Q2M2Z5, Q3MHH3, Q3V089, Q569L8, Q5BQN8, Q5CZC0, Q5DTT3, Q5R9I1, Q5VWN6, Q61493, Q641I1, Q6NS59, Q6NSW3, Q6ZP01, Q6ZU52, Q7TSH4, Q7Z333, Q7Z3T8, Q80U44, Q80U59, Q86UW6, Q86WS4, Q86XD8, Q8IXS0, Q8MJ03, Q8MJ04, Q8MJ06, Q8N1H7, Q8N7Z5

Diamond homologs: O64843, Q6NQH9, Q86UW6, Q9LYE5, Q9UTP4, O74840, Q08954, Q29S05, Q3V2Q8, Q5TBK1, Q66H65, Q8JZS6, Q92802, P13233

SIGNOR signaling

0 interactions.

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 58 IntAct physical interaction partners (hypergeometric vs the genome-wide background, BH-FDR, gene-set size 15–500, ranked by fold). A functional readout of the neighbourhood — distinct from this gene’s own memberships above, and biased toward well-studied / hub proteins, so read it as themes rather than proof.

Reactome pathways:

PathwayPartnersFoldFDR
mRNA Splicing617.3×2e-04
Anchoring of the basal body to the plasma membrane514.9×1e-03
Processing of Capped Intron-Containing Pre-mRNA613.0×4e-04
Mitotic Prometaphase59.1×8e-03
Metabolism of RNA88.8×3e-04
mRNA Splicing - Major Pathway68.6×3e-03

Disease & clinical

Cancer significance

From intOGen — cancer-driver classification: loss-of-function (tumor-suppressor-like) across 3 cancer types — CHOL, HCC, UTUC.

Clinical variants and AI predictions

ClinVar

246 variants total. Per-class counts are floors (≥ shown; pagination cap):

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance210
Likely benign22
Benign2

Top pathogenic / likely-pathogenic (0)

SpliceAI

4436 predictions. Top by Δscore:

VariantEffectΔscore
4:40057027:GCAG:Gdonor_gain1.0000
4:40057028:CAG:Cdonor_loss1.0000
4:40057029:AG:Adonor_loss1.0000
4:40057030:GG:Gdonor_loss1.0000
4:40057031:G:GAdonor_loss1.0000
4:40057032:T:Gdonor_loss1.0000
4:40073453:A:AGacceptor_gain1.0000
4:40073454:G:GGacceptor_gain1.0000
4:40073548:GACA:Gdonor_gain1.0000
4:40073552:G:GGdonor_gain1.0000
4:40102062:T:Aacceptor_gain1.0000
4:40102072:CA:Cacceptor_loss1.0000
4:40102073:A:AGacceptor_gain1.0000
4:40102073:AGTT:Aacceptor_gain1.0000
4:40102074:G:GAacceptor_gain1.0000
4:40102074:GTT:Gacceptor_gain1.0000
4:40102074:GTTG:Gacceptor_gain1.0000
4:40106894:TCACA:Tacceptor_loss1.0000
4:40106895:CACA:Cacceptor_loss1.0000
4:40106896:ACAG:Aacceptor_gain1.0000
4:40106897:CA:Cacceptor_loss1.0000
4:40106898:A:AGacceptor_gain1.0000
4:40106898:AG:Aacceptor_gain1.0000
4:40106899:G:GAacceptor_loss1.0000
4:40106899:G:GGacceptor_gain1.0000
4:40106899:GG:Gacceptor_gain1.0000
4:40107022:GTG:Gdonor_gain1.0000
4:40107025:G:GGdonor_gain1.0000
4:40107025:GTA:Gdonor_loss1.0000
4:40107026:T:TCdonor_loss1.0000

AlphaMissense

11831 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
4:40144735:T:CL1693P1.000
4:40103170:T:CL442P0.999
4:40103179:T:CL445P0.999
4:40103184:G:CG447R0.999
4:40103203:A:TK453I0.999
4:40106937:A:CS471R0.999
4:40106939:T:AS471R0.999
4:40106939:T:GS471R0.999
4:40106952:T:CF476L0.999
4:40106954:T:AF476L0.999
4:40106954:T:GF476L0.999
4:40107022:G:CR499P0.999
4:40112123:T:AI513K0.999
4:40112126:A:TD514V0.999
4:40112130:T:AN515K0.999
4:40112130:T:GN515K0.999
4:40112146:T:AW521R0.999
4:40112146:T:CW521R0.999
4:40112165:T:AV527D0.999
4:40113480:T:AW546R0.999
4:40113480:T:CW546R0.999
4:40113502:T:CL553P0.999
4:40117871:G:CR556P0.999
4:40122274:T:CL1388P0.999
4:40123195:T:AW1423R0.999
4:40123195:T:CW1423R0.999
4:40131859:T:CL1529P0.999
4:40142805:G:CA1640P0.999
4:40144735:T:AL1693H0.999
4:40144744:T:CL1696P0.999

dbSNP variants (sampled 300 via entrez): RS10000000 (4:40087276 A>G,T), RS1000008879 (4:40094660 A>C,G), RS1000018253 (4:40087304 G>A,C), RS1000065117 (4:40070934 C>A,T), RS1000067958 (4:40180603 A>G), RS1000074447 (4:40130000 T>C), RS1000112863 (4:40148214 C>T), RS10001172 (4:40156957 T>C), RS1000120019 (4:40181010 C>T), RS1000126162 (4:40143341 T>A), RS1000146222 (4:40133080 C>T), RS1000153325 (4:40160631 G>A), RS1000203254 (4:40094156 A>C), RS1000222404 (4:40181079 G>A), RS1000224156 (4:40058668 G>A)

Disease associations

OMIM: gene MIM:619139 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

0 total (0 of 0 shown, HPO-id order):

GWAS associations

1 associations (top):

StudyTraitp-value
GCST001501_3Platelet thrombus formation1.000000e-06

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

PharmGKB: 1 entry (VIP=true, CPIC=false)

CTD chemical–gene interactions

47 total (human), top 30 by PubMed support.

ChemicalActions (top 5)PubMed papers
Valproic Acidaffects expression, decreases expression4
Cyclosporineincreases expression4
Benzo(a)pyrenedecreases expression, increases methylation3
sodium arsenitedecreases expression, increases expression2
Air Pollutantsdecreases expression, increases abundance, increases expression2
Aflatoxin B1affects expression, decreases expression, decreases methylation2
Cadmium Chlorideincreases abundance, increases expression, decreases expression2
Particulate Matterincreases expression, decreases expression, increases abundance2
aristolochic acid Idecreases expression1
FR900359increases phosphorylation1
myristicindecreases expression1
triphenyl phosphateaffects expression1
trichostatin Aaffects expression1
aflatoxin B2decreases methylation1
cyanoginosin LRincreases expression1
di-n-butylphosphoric acidaffects expression1
perfluorooctane sulfonic aciddecreases expression1
2-palmitoylglycerolincreases expression1
monomethylarsonous aciddecreases expression1
erucylphospho-N,N,N-trimethylpropylammoniumincreases expression1
ICG 001increases expression1
abrinedecreases expression1
bisphenol Saffects cotreatment, decreases methylation1
jinfukangdecreases expression1
riccardin Dincreases expression1
NSC 689534affects binding, increases expression1
4-(4-((5-(4,5-dimethyl-2-nitrophenyl)-2-furanyl)methylene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzoic acidincreases expression1
Resveratrolaffects cotreatment, increases expression1
Sunitinibincreases expression1
Fulvestrantaffects cotreatment, decreases methylation1

Cellosaurus cell lines

2 cell lines: 2 cancer cell line

First 10 cell lines (id-ordered, not curated):

CellosaurusNameCategorySex
CVCL_E2D0HAP1 N4BP2 (-) 1Cancer cell lineMale
CVCL_E2D1HAP1 N4BP2 (-) 2Cancer cell lineMale

Clinical trials (associated diseases)

0 trials via MONDO — disease-level, not drug-specific.

No linked Atlas pages yet — the cross-entity mesh grows as the corpus expands.