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PROTEIN SUMMARY SECTION OVERVIEW GENE INFORMATION RNA DATA ANTIBODY DATA
GENERAL INFORMATIONi

General description of the gene and the encoded protein(s) using information from HGNC and Ensembl, as well as predictions made by the Human Protein Atlas project.

Gene namei

Official gene symbol, which is typically a short form of the gene name, according to HGNC.

APOO
Synonyms FAM121B, MGC4825, Mic23, MIC26, MICOS26, My025
Gene descriptioni

Full gene name according to HGNC.

Apolipoprotein O
Protein classi

Assigned HPA protein class(es) for the encoded protein(s).

Transporters
Predicted locationi

All transcripts of all genes have been analyzed regarding the location(s) of corresponding protein based on prediction methods for signal peptides and transmembrane regions.

  • Genes with at least one transcript predicted to encode a secreted protein, according to prediction methods or to UniProt location data, have been further annotated and classified with the aim to determine if the corresponding protein(s) are secreted or actually retained in intracellular locations or membrane-attached.

  • Remaining genes, with no transcript predicted to encode a secreted protein, will be assigned the prediction-based location(s).

The annotated location overrules the predicted location, so that a gene encoding a predicted secreted protein that has been annotated as intracellular will have intracellular as the final location.

Secreted, Membrane, Intracellular
Protein evidence Evidence at protein level (all genes)
GENE INFORMATIONi

Gene information from Ensembl and Entrez, as well as links to available gene identifiers are displayed here. Information was retrieved from Ensembl if not indicated otherwise.

Chromosome X
Cytoband p22.11
Chromosome location (bp) 23833353 - 23907938
Number of transcriptsi

Number of protein-coding transcripts from the gene as defined by Ensembl.

5
Ensembl ENSG00000184831 (version 109)
Entrez gene 79135
HGNC HGNC:28727
UniProt Q9BUR5 (UniProt - Evidence at protein level)
neXtProt NX_Q9BUR5
GeneCards APOO
Antibodypedia APOO antibodies


PROTEIN FUNCTION
Protein function (UniProt)i

Useful information about the protein provided by UniProt.

Component of the MICOS complex, a large protein complex of the mitochondrial inner membrane that plays crucial roles in the maintenance of crista junctions, inner membrane architecture, and formation of contact sites to the outer membrane. Plays a crucial role in crista junction formation and mitochondrial function 1. Can promote cardiac lipotoxicity by enhancing mitochondrial respiration and fatty acid metabolism in cardiac myoblasts 2. Promotes cholesterol efflux from macrophage cells. Detected in HDL, LDL and VLDL. Secreted by a microsomal triglyceride transfer protein (MTTP)-dependent mechanism, probably as a VLDL-associated protein that is subsequently transferred to HDL 3.... show less
Biological process (UniProt)i

Keywords assigned by UniProt to proteins because they are involved in a particular biological process.

Lipid transport, Transport
Gene summary (Entrez)i

Useful information about the gene from Entrez

This gene is a member of the apolipoprotein family. Members of this protein family are involved in the transport and metabolism of lipids. The encoded protein associates with HDL, LDL and VLDL lipoproteins and is characterized by chondroitin-sulfate glycosylation. This protein may be involved in preventing lipid accumulation in the myocardium in obese and diabetic patients. Alternative splicing results in multiple transcript variants. Pseudogenes of this gene are found on chromosomes 3, 4, 5, 12 and 16.[provided by RefSeq, Sep 2009]... show less
PROTEIN INFORMATIONi

The protein information section displays alternative protein-coding transcripts (splice variants) encoded by this gene according to the Ensembl database.

The ENSP identifier links to the Ensembl website protein summary, while the ENST identifier links to the Ensembl website transcript summary for the selected splice variant. The data in the UniProt column can be expanded to show links to all matching UniProt identifiers for this protein.

The protein classes assigned to this protein are shown if expanding the data in the protein class column. Parent protein classes are in bold font and subclasses are listed under the parent class.

The Gene Ontology terms assigned to this protein are listed if expanding the Gene ontology column. The length of the protein (amino acid residues according to Ensembl), molecular mass (kDalton), predicted signal peptide (according to a majority of the signal peptide predictors SPOCTOPUS, SignalP 4.0, and Phobius) and the number of predicted transmembrane region(s) (according to MDM) are also reported.
Splice variant SwissProt TrEMBL Protein class Gene ontology Length & mass Signal peptide
(predicted)
Transmembrane regions
(predicted)
APOO-201
ENSP00000368528
ENST00000379226
Q9BUR5
[Direct mapping] MICOS complex subunit MIC26
Show all
Transporters
   Accessory Factors Involved in Transport
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   MEMSAT3 predicted membrane proteins
   Phobius predicted membrane proteins
   SCAMPI predicted membrane proteins
   SPOCTOPUS predicted membrane proteins
   TMHMM predicted membrane proteins
   # TM segments-based
   1TM proteins predicted by MDM
Predicted secreted proteins
Mapped to neXtProt
   neXtProt - Evidence at protein level
Protein evidence (Kim et al 2014)
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0000139 [Golgi membrane]
GO:0001401 [SAM complex]
GO:0005515 [protein binding]
GO:0005576 [extracellular region]
GO:0005615 [extracellular space]
GO:0005739 [mitochondrion]
GO:0005743 [mitochondrial inner membrane]
GO:0005783 [endoplasmic reticulum]
GO:0005789 [endoplasmic reticulum membrane]
GO:0005794 [Golgi apparatus]
GO:0005829 [cytosol]
GO:0006869 [lipid transport]
GO:0007007 [inner mitochondrial membrane organization]
GO:0016020 [membrane]
GO:0034361 [very-low-density lipoprotein particle]
GO:0034362 [low-density lipoprotein particle]
GO:0034364 [high-density lipoprotein particle]
GO:0042407 [cristae formation]
GO:0044284 [mitochondrial crista junction]
GO:0061617 [MICOS complex]
GO:0140275 [MIB complex]
Show all
198 aa
22.3 kDa
Yes 1
APOO-202
ENSP00000402557
ENST00000439528
H7C1U8
[Direct mapping] MICOS complex subunit
Show all
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   MEMSAT3 predicted membrane proteins
   Phobius predicted membrane proteins
   SCAMPI predicted membrane proteins
   SPOCTOPUS predicted membrane proteins
   TMHMM predicted membrane proteins
   # TM segments-based
   1TM proteins predicted by MDM
Predicted secreted proteins
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0005739 [mitochondrion]
GO:0005743 [mitochondrial inner membrane]
GO:0005829 [cytosol]
GO:0016020 [membrane]
GO:0042407 [cristae formation]
GO:0061617 [MICOS complex]
Show all
178 aa
20.1 kDa
No 1
APOO-205
ENSP00000488524
ENST00000633372
A0A0J9YXS4
[Direct mapping] MICOS complex subunit
Show all
Predicted membrane proteins
   Prediction method-based
   Membrane proteins predicted by MDM
   MEMSAT3 predicted membrane proteins
   Phobius predicted membrane proteins
   SCAMPI predicted membrane proteins
   SPOCTOPUS predicted membrane proteins
   TMHMM predicted membrane proteins
   # TM segments-based
   1TM proteins predicted by MDM
Predicted secreted proteins
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0005739 [mitochondrion]
GO:0005743 [mitochondrial inner membrane]
GO:0016020 [membrane]
GO:0042407 [cristae formation]
GO:0061617 [MICOS complex]
Show all
81 aa
9 kDa
No 1
APOO-206
ENSP00000488538
ENST00000633432
A0A0J9YXT7
[Direct mapping] MICOS complex subunit
Show all
Predicted secreted proteins
   SPOCTOPUS predicted secreted proteins
Predicted intracellular proteins
   Intracellular proteins predicted by MDM and MDSEC
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0005739 [mitochondrion]
GO:0005743 [mitochondrial inner membrane]
GO:0016020 [membrane]
GO:0042407 [cristae formation]
GO:0061617 [MICOS complex]
Show all
49 aa
5.1 kDa
No 0
APOO-208
ENSP00000488146
ENST00000634086
A0A0J9YWW6
[Direct mapping] MICOS complex subunit
Show all
   MEMSAT3 predicted membrane proteins
   SPOCTOPUS predicted membrane proteins
Predicted secreted proteins
   Phobius predicted secreted proteins
Predicted intracellular proteins
   Intracellular proteins predicted by MDM and MDSEC
Protein evidence (Ezkurdia et al 2014)
Show all
GO:0005739 [mitochondrion]
GO:0005743 [mitochondrial inner membrane]
GO:0005829 [cytosol]
GO:0016020 [membrane]
GO:0042407 [cristae formation]
GO:0061617 [MICOS complex]
Show all
90 aa
9.9 kDa
No 0

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