SLC35B1

gene
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Also known as UGTREL1AXER

Summary

SLC35B1 (solute carrier family 35 member B1, HGNC:20798) is a protein-coding gene on chromosome 17q21.33, encoding Solute carrier family 35 member B1 (P78383). ATP:ADP antiporter that catalyzes the exchange of ATP and ADP across the endoplasmic reticulum (ER) membrane. It is a common-essential gene (DepMap: required in 98.2% of cancer cell lines).

This gene encodes a nucleotide sugar transporter which is a member of solute carrier family 35. The transporters in this family are highly conserved hydrophobic proteins with multiple transmembrane domains. Alternative splicing results in multiple transcript variants encoding different isoforms.

Source: NCBI Gene 10237 — RefSeq curated summary.

At a glance

  • Clinical variants (ClinVar): 56 total
  • Cancer dependency (DepMap): dependent in 98.2% of screened cell lines (common-essential)
  • MANE Select transcript: NM_005827

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:20798
Approved symbolSLC35B1
Namesolute carrier family 35 member B1
Location17q21.33
Locus typegene with protein product
StatusApproved
AliasesUGTREL1, AXER
Ensembl geneENSG00000121073
Ensembl biotypeprotein_coding
OMIM610790
Entrez10237

Gene structure

Transcript identifiers

Ensembl transcripts: 27 — 15 protein_coding, 10 retained_intron, 2 nonsense_mediated_decay

ENST00000240333, ENST00000435059, ENST00000502268, ENST00000502406, ENST00000503334, ENST00000504260, ENST00000505765, ENST00000507477, ENST00000507773, ENST00000508520, ENST00000508607, ENST00000508749, ENST00000508926, ENST00000509781, ENST00000511657, ENST00000511763, ENST00000513508, ENST00000514907, ENST00000515850, ENST00000649906, ENST00000858530, ENST00000858531, ENST00000858532, ENST00000858533, ENST00000940145, ENST00000940146, ENST00000953815

RefSeq mRNA: 2 — MANE Select: NM_005827 NM_001278784, NM_005827

CCDS: CCDS11552

Canonical transcript exons

ENST00000240333 — 9 exons

ExonStartEnd
ENSE000020684704970094349701510
ENSE000020723264970773049707964
ENSE000034876934970620449706334
ENSE000035845694970318849703294
ENSE000035857544970512449705281
ENSE000035984094970586649705896
ENSE000036442514970285849703011
ENSE000036701034970696549707068
ENSE000037856874970410049704226

Expression profiles

Bgee: expression breadth ubiquitous, 286 present calls, max score 96.92.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 41.8899 / max 447.7498, expressed in 1824 samples.

FANTOM5 promoters (6 alternative TSS)

Promoter IDTPM avgSamples expressed
16682136.83031823
1668221.9792947
1668191.3584533
1668201.2631710
2082420.3568174
1668240.102238

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
islet of LangerhansUBERON:000000696.92gold quality
adenohypophysisUBERON:000219696.27gold quality
right lobe of thyroid glandUBERON:000111995.95gold quality
left lobe of thyroid glandUBERON:000112095.86gold quality
hindlimb stylopod muscleUBERON:000425295.74gold quality
right lobe of liverUBERON:000111495.66gold quality
jejunal mucosaUBERON:000039995.65gold quality
pituitary glandUBERON:000000795.62gold quality
body of pancreasUBERON:000115095.52gold quality
oocyteCL:000002395.51gold quality
gastrocnemiusUBERON:000138895.51gold quality
stromal cell of endometriumCL:000225595.47gold quality
heart left ventricleUBERON:000208495.42gold quality
muscle of legUBERON:000138395.31gold quality
cardiac ventricleUBERON:000208295.31gold quality
thyroid glandUBERON:000204695.27gold quality
right atrium auricular regionUBERON:000663195.13gold quality
pancreasUBERON:000126495.11gold quality
olfactory segment of nasal mucosaUBERON:000538695.03gold quality
duodenumUBERON:000211494.95gold quality
small intestine Peyer’s patchUBERON:000345494.94gold quality
granulocyteCL:000009494.89gold quality
rectumUBERON:000105294.88gold quality
upper lobe of left lungUBERON:000895294.82gold quality
cardiac atriumUBERON:000208194.80gold quality
heartUBERON:000094894.67gold quality
bone marrow cellCL:000209294.59gold quality
metanephros cortexUBERON:001053394.59gold quality
small intestineUBERON:000210894.55gold quality
upper lobe of lungUBERON:000894894.52gold quality

Single-cell (SCXA)

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

ExperimentMarker?Max mean expression
E-ANND-3no0.00

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

17 targeting SLC35B1, 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-4668-3P100.0068.742635
HSA-MIR-426799.9666.532368
HSA-MIR-6885-3P99.7570.363187
HSA-MIR-4446-5P99.7269.192544
HSA-MIR-120899.7068.281533
HSA-MIR-4685-5P99.2565.991563
HSA-MIR-6837-5P99.2565.471632
HSA-MIR-149-5P99.2567.161315
HSA-MIR-3191-5P99.2466.521722
HSA-MIR-6749-3P99.0065.731443
HSA-MIR-446398.5666.051071
HSA-MIR-6776-3P98.3866.34655
HSA-MIR-585-5P97.5469.02955
HSA-MIR-425397.4865.11692
HSA-MIR-6862-5P97.4864.84713
HSA-MIR-7847-3P96.6364.58952
HSA-MIR-6822-3P96.6066.06680

Functional genomics

DepMap (CRISPR cell-line fitness): dependent in 98.2% of screened cell lines, common-essential.

Literature-anchored findings (GeneRIF, showing 2)

  • SLC35B1 significantly contributes to the uptake of UDPGA into the endoplasmic reticulum for glucuronidation catalyzed by UDP-glucuronosyltransferases. (PMID:32179043)
  • The broad range di- and tri-nucleotide exchanger SLC35B1 displays asymmetrical affinities for ATP transport across the ER membrane. (PMID:35041824)

Cross-species orthologs

5 orthologs

OrganismSymbolGene ID
danio_rerioslc35b1ENSDARG00000038213
mus_musculusSlc35b1ENSMUSG00000020873
rattus_norvegicusSlc35b1ENSRNOG00000004510
drosophila_melanogastermeigoFBGN0250820
caenorhabditis_elegansWBGENE00013740

Paralogs (3): SLC35B3 (ENSG00000124786), SLC35B2 (ENSG00000157593), SLC35B4 (ENSG00000205060)

Protein

Protein identifiers

Solute carrier family 35 member B1P78383 (reviewed: P78383)

Alternative names: ATP/ADP exchanger ER, Endoplasmic reticulum ATP/ADP translocase, UDP-galactose transporter-related protein 1

All UniProt accessions (9): D6R981, D6R9G9, D6RB73, D6RDY9, D6RE58, D6RF81, D6RG34, D6RHG0, P78383

UniProt curated annotations — full annotation on UniProt →

Function. ATP:ADP antiporter that catalyzes the exchange of ATP and ADP across the endoplasmic reticulum (ER) membrane. Imports ATP from the cytosol to the ER lumen and exports ADP in the opposite direction. Regulates ER energy metabolism and protein biogenesis. Appears to be part of a calcium-dependent ER to cytosol low energy response axis, where calcium efflux from ER to the cytosol triggers ATP import into the ER lumen to maintain sufficient ATP supply. Provides ATP to ER chaperone HSPA5 that drives protein folding and trafficking in the ER. Can transport dATP, UTP or UDP in exchange for ATP, but the physiological relevance of this process remains to be established. ATP:ADP antiporter. ATP:ADP antiporter.

Subunit / interactions. Monomer.

Subcellular location. Endoplasmic reticulum membrane.

Domain organisation. The di-lysine motif confers endoplasmic reticulum localization for type I membrane proteins.

Similarity. Belongs to the nucleotide-sugar transporter family. SLC35B subfamily.

Isoforms (2)

UniProt IDNamesCanonical?
P78383-11yes
P78383-22

RefSeq proteins (2): NP_001265713, NP_005818* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR013657HUT1Family
IPR037185EmrE-likeHomologous_superfamily

Pfam: PF08449

Catalyzed reactions (Rhea), 4 shown:

  • ADP(in) + ATP(out) = ADP(out) + ATP(in) (RHEA:34999)
  • UDP(out) + ATP(in) = UDP(in) + ATP(out) (RHEA:73707)
  • UTP(out) + ATP(in) = UTP(in) + ATP(out) (RHEA:73711)
  • dATP(out) + ATP(in) = dATP(in) + ATP(out) (RHEA:73715)

UniProt features (47 total): topological domain 11, mutagenesis site 11, transmembrane region 10, binding site 6, sequence conflict 3, modified residue 2, chain 1, short sequence motif 1, splice variant 1, sequence variant 1

Structure

Experimental structures (PDB)

7 structures.

PDBMethodResolution (Å)
9I20ELECTRON MICROSCOPY2.85
9GRYELECTRON MICROSCOPY3
9GS5ELECTRON MICROSCOPY3.1
9GS3ELECTRON MICROSCOPY3.15
9GS7ELECTRON MICROSCOPY3.15
9GSLELECTRON MICROSCOPY3.37
9GRZELECTRON MICROSCOPY3.4

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-P78383-F186.630.57

Antibody-complex structures (SAbDab): 69GRY, 9GS3, 9GS5, 9GS7, 9GSL, 9I20

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 (6): 120; 254; 257; 269; 273; 277

Post-translational modifications (2): 15, 29

Mutagenesis-validated functional residues (11):

PositionPhenotype
25decreases adp uptake.
94decreases adp uptake.
117loss of atp:adp antiporter activity. decreases adp uptake.
120loss of atp:adp antiporter activity. decreases adp uptake.
190decreases adp uptake.
254decreases adp uptake.
257decreases adp uptake.
261decreases adp uptake.
273decreases adp uptake.
276loss of atp:adp antiporter activity. decreases adp uptake.
277loss of atp:adp antiporter activity. decreases adp uptake.

Function

Pathways and Gene Ontology

Reactome pathways

0 pathways

MSigDB gene sets: 210 (showing top): ELVIDGE_HYPOXIA_DN, PAX4_01, ACEVEDO_NORMAL_TISSUE_ADJACENT_TO_LIVER_TUMOR_DN, DARWICHE_SKIN_TUMOR_PROMOTER_DN, DARWICHE_PAPILLOMA_RISK_LOW_UP, KYNG_DNA_DAMAGE_DN, DARWICHE_PAPILLOMA_RISK_HIGH_DN, DARWICHE_SQUAMOUS_CELL_CARCINOMA_DN, GOBP_NUCLEOTIDE_TRANSPORT, OUELLET_OVARIAN_CANCER_INVASIVE_VS_LMP_UP, GOBP_ORGANOPHOSPHATE_ESTER_TRANSPORT, WEI_MYCN_TARGETS_WITH_E_BOX, AP1_Q4_01, MARTINEZ_RB1_TARGETS_DN, GOMF_NUCLEOBASE_CONTAINING_COMPOUND_TRANSMEMBRANE_TRANSPORTER_ACTIVITY

GO Biological Process (5): UDP-galactose transmembrane transport (GO:0072334), UDP-glucose transmembrane transport (GO:0015786), ADP transport (GO:0015866), ATP transport (GO:0015867), transmembrane transport (GO:0055085)

GO Molecular Function (5): UDP-galactose transmembrane transporter activity (GO:0005459), UDP-glucose transmembrane transporter activity (GO:0005460), ATP:ADP antiporter activity (GO:0005471), protein binding (GO:0005515), antiporter activity (GO:0015297)

GO Cellular Component (6): Golgi membrane (GO:0000139), nucleoplasm (GO:0005654), endoplasmic reticulum (GO:0005783), endoplasmic reticulum membrane (GO:0005789), intracellular membrane-bounded organelle (GO:0043231), membrane (GO:0016020)

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
pyrimidine nucleotide-sugar transmembrane transport2
purine ribonucleotide transport2
adenine nucleotide transport2
pyrimidine nucleotide-sugar transmembrane transporter activity2
cellular anatomical structure2
transport1
cellular process1
UDP-galactose transmembrane transport1
UDP-glucose transmembrane transport1
ATP transmembrane transporter activity1
ADP transmembrane transporter activity1
antiporter activity1
binding1
secondary active transmembrane transporter activity1
Golgi apparatus1
bounding membrane of organelle1
nuclear lumen1
cytoplasm1
endomembrane system1
intracellular membrane-bounded organelle1
organelle membrane1
nuclear outer membrane-endoplasmic reticulum membrane network1
endoplasmic reticulum subcompartment1
intracellular anatomical structure1
membrane-bounded organelle1
intracellular organelle1

Protein interactions and networks

STRING

1286 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
SLC35B1SLC35D1Q9NTN3950
SLC35B1SLC35D3Q5M8T2798
SLC35B1SLC35A2P78381793
SLC35B1SLC35D2Q76EJ3770
SLC35B1SLC35A5Q9BS91583
SLC35B1SLC35A4Q96G79573
SLC35B1SLC35E1Q96K37550
SLC35B1SLC35H1Q9NQQ7547
SLC35B1SLC35C1Q96A29540
SLC35B1SLC35F1Q5T1Q4531
SLC35B1SLC35A1P78382526
SLC35B1EMC7Q9NPA0487
SLC35B1TMEM208Q9BTX3477
SLC35B1IER3IP1Q9Y5U9465
SLC35B1YIPF6Q96EC8448

IntAct

56 interactions, top by confidence:

ABTypeScore
SLC35B1FXYD3psi-mi:“MI:0915”(physical association)0.560
BNIP3SLC35B1psi-mi:“MI:0915”(physical association)0.560
PTPN5SLC35B1psi-mi:“MI:0915”(physical association)0.560
CD74SLC35B1psi-mi:“MI:0915”(physical association)0.560
SLC35B1CREB3L1psi-mi:“MI:0915”(physical association)0.560
SLC35B1FZD5psi-mi:“MI:0915”(physical association)0.560
SLC35B1ARL13Bpsi-mi:“MI:0915”(physical association)0.560
SLC35B1VSIRpsi-mi:“MI:0915”(physical association)0.560
SLC35B1VAPApsi-mi:“MI:0915”(physical association)0.560
SLC35B1FKBP8psi-mi:“MI:0915”(physical association)0.560
SLC35B1AQP6psi-mi:“MI:0915”(physical association)0.560
SLC35B1BNIP3psi-mi:“MI:0915”(physical association)0.560
CD79ASLC35B1psi-mi:“MI:0915”(physical association)0.560
SLC35B1CCDC107psi-mi:“MI:0915”(physical association)0.560
SLC35B1MFFpsi-mi:“MI:0915”(physical association)0.560
SLC35B1GPR152psi-mi:“MI:0915”(physical association)0.560
SLC35B1PDZK1IP1psi-mi:“MI:0915”(physical association)0.560
SLC35B1PGRMC1psi-mi:“MI:0914”(association)0.530
E2SLC35B1psi-mi:“MI:0915”(physical association)0.370
SLC35B1DRD2psi-mi:“MI:0915”(physical association)0.370
SLC35B1FZD7psi-mi:“MI:0915”(physical association)0.370
SLC35B1HRH1psi-mi:“MI:0915”(physical association)0.370
PCNASLC35B1psi-mi:“MI:0915”(physical association)0.370
SLC35B1NDUFS8psi-mi:“MI:0914”(association)0.350
SLC35B1MFFpsi-mi:“MI:0915”(physical association)0.000

BioGRID (107): SLC35B1 (Affinity Capture-MS), SLC35B1 (Affinity Capture-MS), SLC35B1 (Two-hybrid), SLC35B1 (Two-hybrid), SLC35B1 (Two-hybrid), SLC35B1 (Two-hybrid), SLC35B1 (Two-hybrid), SLC35B1 (Two-hybrid), SLC35B1 (Two-hybrid), SLC35B1 (Two-hybrid), CREB3L1 (Two-hybrid), CCDC107 (Two-hybrid), PDZK1IP1 (Two-hybrid), FZD5 (Two-hybrid), MFF (Two-hybrid)

ESM2 similar proteins: A0JMG9, A4IFK2, A4IHW3, A6QM03, A7S1L6, A7TES5, A9UUB8, C8Z742, O08520, O74750, P78383, P87041, P97858, Q02334, Q12520, Q17CE7, Q18779, Q1JQ66, Q20787, Q29Q28, Q3E6T0, Q550W6, Q61420, Q61LC0, Q66HX0, Q6CR04, Q6FRE5, Q6GQ70, Q6PGC7, Q6V7K3, Q753T9, Q7Z769, Q84L08, Q8AWB6, Q8BLX4, Q8MII5, Q8WZJ9, Q94EI9, Q968A5, Q96A29

Diamond homologs: O64503, P78383, P97858, Q4P9R2, Q54I86, Q55DM5, Q5R9A1, Q66HX0, Q6BMV3, Q6C4X5, Q6GQ70, Q6NM25, Q6NMB6, Q6V7K3, Q8AWB6, Q8AXS6, Q8MII5, Q8MXJ9, Q8TB61, Q8WZJ9, Q91ZN5, Q9M9S6, Q9VDD7, Q9VEI3, P0CP32, P0CP33, Q4WJM7, Q5ADN8, Q5B5W2, Q6CR04, Q755H7, Q5R831, Q922Q5, Q9H1N7, Q12520, Q6FSF8, Q17CE7, Q20787, Q29EY2, Q29Q28

SIGNOR signaling

0 interactions.

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance39
Likely benign3
Benign0

Top pathogenic / likely-pathogenic (0)

SpliceAI

1645 predictions. Top by Δscore:

VariantEffectΔscore
17:49703010:CT:Cacceptor_gain1.0000
17:49703181:CACT:Cdonor_loss1.0000
17:49703182:ACTC:Adonor_loss1.0000
17:49703183:CTCA:Cdonor_loss1.0000
17:49703184:TCACC:Tdonor_loss1.0000
17:49703185:CA:Cdonor_loss1.0000
17:49703186:ACCT:Adonor_loss1.0000
17:49703187:CC:Cdonor_loss1.0000
17:49703292:TTC:Tacceptor_gain1.0000
17:49703305:A:Cacceptor_gain1.0000
17:49704098:AC:Adonor_gain1.0000
17:49704099:CC:Cdonor_gain1.0000
17:49705118:TCATA:Tdonor_loss1.0000
17:49705119:CATA:Cdonor_loss1.0000
17:49705121:TA:Tdonor_loss1.0000
17:49705122:A:ACdonor_gain1.0000
17:49705122:ACCA:Adonor_loss1.0000
17:49705123:C:Adonor_loss1.0000
17:49705123:C:CCdonor_gain1.0000
17:49705132:G:Cdonor_gain1.0000
17:49705174:T:Adonor_gain1.0000
17:49705277:CATGA:Cacceptor_gain1.0000
17:49705278:ATGA:Aacceptor_gain1.0000
17:49705279:TGA:Tacceptor_gain1.0000
17:49705279:TGAC:Tacceptor_loss1.0000
17:49705280:GA:Gacceptor_gain1.0000
17:49705281:AC:Aacceptor_loss1.0000
17:49705282:C:CCacceptor_gain1.0000
17:49705282:CTACA:Cacceptor_loss1.0000
17:49705283:T:Cacceptor_loss1.0000

AlphaMissense

2081 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
17:49704207:T:AD183V1.000
17:49704207:T:GD183A1.000
17:49704208:C:GD183H1.000
17:49704216:A:GL180P1.000
17:49705190:G:CF154L1.000
17:49705190:G:TF154L1.000
17:49705192:A:GF154L1.000
17:49705203:C:TG150E1.000
17:49705204:C:GG150R1.000
17:49705204:C:TG150R1.000
17:49705876:C:AK120N1.000
17:49705876:C:GK120N1.000
17:49705892:A:TL115H1.000
17:49701507:A:TL307H0.999
17:49701510:C:TG306D0.999
17:49702858:C:GG306R0.999
17:49702862:G:CF304L0.999
17:49702862:G:TF304L0.999
17:49702864:A:GF304L0.999
17:49702866:A:TV303E0.999
17:49702878:C:TG299D0.999
17:49702879:C:GG299R0.999
17:49702935:G:TT280K0.999
17:49702947:C:GR276P0.999
17:49702953:G:TT274K0.999
17:49702967:G:CC269W0.999
17:49702969:A:GC269R0.999
17:49702980:C:AG265V0.999
17:49703000:A:CF258L0.999
17:49703000:A:TF258L0.999

dbSNP variants (sampled 300 via entrez): RS1000276040 (17:49705559 A>C), RS1000571047 (17:49701866 G>A), RS1000918106 (17:49702116 C>T), RS1001098651 (17:49705933 G>A), RS1001950978 (17:49707665 A>G,T), RS1002205455 (17:49705477 G>A), RS1002412725 (17:49701281 C>G,T), RS1002536045 (17:49703918 T>C), RS1003312952 (17:49706056 A>G), RS1005099750 (17:49702433 TAA>T), RS1005192593 (17:49707598 A>C), RS1005243211 (17:49707206 G>A,C), RS1005699439 (17:49700950 GTT>G,GT,GTTT), RS1006023918 (17:49704722 T>A,C), RS1006166150 (17:49700542 G>A,C)

Disease associations

OMIM: gene MIM:610790 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

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

GWAS associations

0 associations (top):

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

GtoPdb / IUPHAR curated pharmacology

(IUPHAR/BPS Guide to Pharmacology — expert-curated)

Target class: transporter — SLC35 family of nucleotide sugar transporters

CTD chemical–gene interactions

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

ChemicalActions (top 5)PubMed papers
Cyclosporineaffects cotreatment, increases expression5
Air Pollutantsincreases abundance, increases expression, decreases expression2
Smokedecreases expression, increases abundance2
Tunicamycinincreases expression2
Valproic Aciddecreases methylation, increases expression2
Thapsigarginincreases expression2
FR900359affects phosphorylation1
alpha phellandrenedecreases expression1
triphenyl phosphateaffects expression1
bisphenol Aaffects expression1
beta-lapachonedecreases expression1
sodium arsenitedecreases expression1
nefazodoneaffects cotreatment, increases expression1
di-n-butylphosphoric acidaffects expression1
CGP 52608increases reaction, affects binding1
Atrazinedecreases expression1
Benzo(a)pyreneincreases methylation1
Carbamazepineaffects expression1
Chenodeoxycholic Acidaffects cotreatment, increases expression1
Deoxycholic Acidaffects cotreatment, increases expression1
Diurondecreases expression1
Doxorubicindecreases expression1
Glycochenodeoxycholic Acidaffects cotreatment, increases expression1
Glycocholic Acidaffects cotreatment, increases expression1
Glycodeoxycholic Acidaffects cotreatment, increases expression1
Rotenoneincreases expression1
Zincincreases expression1
Isotretinoindecreases expression1
Sodium Seleniteincreases expression1
Copper Sulfatedecreases expression1

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.