Seroatlas · Human Serome Atlas

AOC1

Diamine oxidase [copper-containing]

Also known as: ABP, ABP1, AOC1_HUMAN, DAO

Cross-references: UniProt · Ensembl · Human Protein Atlas · GeneCards · NCBI Gene

Protein identityUniProt · HPA

UniProt accession
P19801
Gene
AOC1
Ensembl
ENSG00000002726
Chromosome
7
Canonical length
751 aa
Protein class
Enzymes, Metabolic proteins, Predicted secreted proteins
Secretome location
Secreted in other tissues
Quaternary structure
Homodimer

OverviewNCBI Gene

This gene encodes a metal-binding membrane glycoprotein that oxidatively deaminates putrescine, histamine, and related compounds. The encoded protein is inhibited by amiloride, a diuretic that acts by closing epithelial sodium ion channels. Alternatively spliced transcript variants encoding multiple isoforms have been observed for this gene. [provided by RefSeq, Jan 2013]

Canonical amino-acid sequenceUniProt

751 residues, UniProt reviewed canonical sequence.

>P19801|AOC1
     1  MPALGWAVAA ILMLQTAMAE PSPGTLPRKA GVFSDLSNQE LKAVHSFLWS KKELRLQPSS
    61  TTTMAKNTVF LIEMLLPKKY HVLRFLDKGE RHPVREARAV IFFGDQEHPN VTEFAVGPLP
   121  GPCYMRALSP RPGYQSSWAS RPISTAEYAL LYHTLQEATK PLHQFFLNTT GFSFQDCHDR
   181  CLAFTDVAPR GVASGQRRSW LIIQRYVEGY FLHPTGLELL VDHGSTDAGH WAVEQVWYNG
   241  KFYGSPEELA RKYADGEVDV VVLEDPLPGG KGHDSTEEPP LFSSHKPRGD FPSPIHVSGP
   301  RLVQPHGPRF RLEGNAVLYG GWSFAFRLRS SSGLQVLNVH FGGERIAYEV SVQEAVALYG
   361  GHTPAGMQTK YLDVGWGLGS VTHELAPGID CPETATFLDT FHYYDADDPV HYPRALCLFE
   421  MPTGVPLRRH FNSNFKGGFN FYAGLKGQVL VLRTTSTVYN YDYIWDFIFY PNGVMEAKMH
   481  ATGYVHATFY TPEGLRHGTR LHTHLIGNIH THLVHYRVDL DVAGTKNSFQ TLQMKLENIT
   541  NPWSPRHRVV QPTLEQTQYS WERQAAFRFK RKLPKYLLFT SPQENPWGHK RTYRLQIHSM
   601  ADQVLPPGWQ EEQAITWARY PLAVTKYRES ELCSSSIYHQ NDPWHPPVVF EQFLHNNENI
   661  ENEDLVAWVT VGFLHIPHSE DIPNTATPGN SVGFLLRPFN FFPEDPSLAS RDTVIVWPRD
   721  NGPNYVQRWI PEDRDCSMPP PFSYNGTYRP V

LocalizationUniProt · AlphaFold · HPA

Whether an antibody against AOC1 can act on the native protein depends on physical access: surface and secreted proteins are reachable by circulating antibodies, intracellular proteins usually are not.

Antibody reachability
Cell surface
Secreted
No
Transmembrane segments
0
Mean surface accessibility (rSASA)
0.25
Highest tissue expression
467 nTPM

Expression across tissuesHPA

Tissue

  • placenta: 467 nTPM
  • small intestine: 214 nTPM
  • duodenum: 173 nTPM
  • colon: 133 nTPM
  • kidney: 128 nTPM
  • rectum: 88 nTPM

Single-cell type

  • enterocytes: 940 nCPM
  • colonocytes: 367 nCPM
  • tuft cells: 173 nCPM
  • extravillous trophoblasts: 129 nCPM
  • goblet cells: 120 nCPM
  • renal collecting duct principal cells: 100 nCPM

Immune cell

  • eosinophil: 31 nTPM
  • neutrophil: 2.5 nTPM
  • myeloid DC: 1.4 nTPM
  • basophil: 0.2 nTPM
  • classical monocyte: 0.1 nTPM
  • intermediate monocyte: 0.1 nTPM

Brain region

  • thalamus: 2.3 nTPM
  • medulla oblongata: 2.1 nTPM
  • midbrain: 2.1 nTPM
  • white matter: 2 nTPM
  • choroid plexus: 1.8 nTPM
  • pons: 1.8 nTPM

Genetic constraint and essentialitygnomAD · DepMap

Does the body need this protein intact? Low LOEUF or a strong DepMap dependency means loss or blockade of the protein is likely to be felt.

gnomAD LOEUF (loss-of-function intolerance)
0.97
gnomAD pLI
0
gnomAD missense Z
0.76
DepMap mean gene effect
-0.05
DepMap dependency class
selective

Cancer expressionTCGA

Across TCGA tumor cohorts, this protein is over-expressed in roughly 3% of surveyed tumor types (aggregate summary; per-cohort expression, alteration, and survival load in the interactive view).

OntologyGO

Biological processes

  • putrescine metabolic process

Molecular functions

Cellular components

Protein domainsUniProt · Pfam · InterPro

KeywordsUniProt

Antibody and autoantibody relevanceSeroatlas analysis

Seroatlas reads AOC1 as an antibody target. Whether an autoantibody or antibody against AOC1 could matter depends on whether native AOC1 is physically reachable, whether the body needs it intact, and whether it acts in a disease-relevant tissue.

AOC1 is annotated at the cell surface, where native AOC1 is exposed to circulating antibodies and is a prime autoantibody target that could block, deplete, or overstimulate it.

Annotation status

The present source text does not explicitly label AOC1 as an autoantigen. Seroatlas presents hypothesis context only and does not manufacture a known-serology claim.

Canonical record: https://seroatlas.com/gene/AOC1. Study-independent annotations aggregated from UniProt, Human Protein Atlas, PubMed, IEDB, Pfam, InterPro, Gene Ontology, AlphaFold, gnomAD, DepMap, ClinVar, TCGA. Catalog release seroatlas-reviewed-human-uniprot-20260313.

Seroatlas is the reference for exploring autoantibody and antibody serology at the human-protein level: the autoreactome and human serome, multiplex serology (HuProt, HuScan, VirScan, PhIP-Seq).

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