Gene description for PSMA8
Gene name proteasome (prosome, macropain) subunit, alpha type, 8
Gene symbol PSMA8
Other names/aliases PSMA7L
Species Homo sapiens
 Database cross references - PSMA8
ExoCarta ExoCarta_143471
Entrez Gene 143471
HGNC 22985
UniProt Q8TAA3  
 PSMA8 identified in exosomes derived from the following tissue/cell type
Neuroblastoma cells 25944692    
Platelets 25332113    
Platelets 25332113    
Platelets 25332113    
Prostate cancer cells 22723089    
Prostate cancer cells 22723089    
Prostate cancer cells 22723089    
 Gene ontology annotations for PSMA8
Molecular Function
    endopeptidase activity GO:0004175 IBA
    threonine-type endopeptidase activity GO:0004298 IEA
Biological Process
    DNA damage response, signal transduction by p53 class mediator resulting in cell cycle arrest GO:0006977 TAS
    innate immune response GO:0045087 TAS
    negative regulation of canonical Wnt signaling pathway GO:0090090 TAS
    antigen processing and presentation of exogenous peptide antigen via MHC class I GO:0042590 TAS
    cellular nitrogen compound metabolic process GO:0034641 TAS
    antigen processing and presentation of exogenous peptide antigen via MHC class I, TAP-dependent GO:0002479 TAS
    anaphase-promoting complex-dependent proteasomal ubiquitin-dependent protein catabolic process GO:0031145 TAS
    small molecule metabolic process GO:0044281 TAS
    programmed cell death GO:0012501 TAS
    regulation of apoptotic process GO:0042981 TAS
    regulation of ubiquitin-protein ligase activity involved in mitotic cell cycle GO:0051439 TAS
    viral process GO:0016032 TAS
    positive regulation of ubiquitin-protein ligase activity involved in regulation of mitotic cell cycle transition GO:0051437 TAS
    apoptotic process GO:0006915 TAS
    protein polyubiquitination GO:0000209 TAS
    negative regulation of apoptotic process GO:0043066 TAS
    gene expression GO:0010467 TAS
    proteasomal ubiquitin-independent protein catabolic process GO:0010499 IBA
    antigen processing and presentation of peptide antigen via MHC class I GO:0002474 TAS
    stimulatory C-type lectin receptor signaling pathway GO:0002223 TAS
    proteasome-mediated ubiquitin-dependent protein catabolic process GO:0043161 IBA
    mitotic cell cycle GO:0000278 TAS
    positive regulation of canonical Wnt signaling pathway GO:0090263 TAS
    regulation of cellular amino acid metabolic process GO:0006521 TAS
Subcellular Localization
    proteasome core complex GO:0005839 IBA
    proteasome core complex, alpha-subunit complex GO:0019773 IEA
    extracellular exosome GO:0070062 IDA
    cytosol GO:0005829 TAS
    spermatoproteasome complex GO:1990111 ISS
    nucleus GO:0005634 IDA
    cytoplasm GO:0005737 IBA
 Experiment description of studies that identified PSMA8 in exosomes
1
Experiment ID 224
ISEV standards
✔
EM|AFM
EV Biophysical techniques
✔
Alix|TSG101
EV Cytosolic markers
✔
CD63|CD81
EV Membrane markers
✔
GOLGA2
EV Negative markers
✘ EV Particle analysis
Identified molecule protein
Identification method Mass spectrometry
PubMed ID 25944692    
Organism Homo sapiens
Experiment description Proteogenomic analysis reveals exosomes are more oncogenic than ectosomes
Authors Keerthikumar S, Gangoda L, Liem M, Fonseka P, Atukorala I, Ozcitti C, Mechler A, Adda CG, Ang CS, Mathivanan S
Journal name Oncotarget
Publication year 2015
Sample Neuroblastoma cells
Sample name SH-SY5Y
Isolation/purification methods Differential centrifugation
Ultracentrifugation
OptiPrep density gradient
Flotation density 1.10 g/mL
Molecules identified in the study Protein
Methods used in the study Mass spectrometry
Western blotting
2
Experiment ID 231
ISEV standards
✘ EV Biophysical techniques
✔
Alix
EV Cytosolic markers
✔
CD63|CD9
EV Membrane markers
✘ EV Negative markers
✔
NTA
EV Particle analysis
Identified molecule protein
Identification method Mass spectrometry
PubMed ID 25332113    
Organism Homo sapiens
Experiment description Lipidomic and proteomic characterization of platelet extracellular vesicle subfractions from senescent platelets
Authors Pienimaeki-Roemer A, Kuhlmann K, Bottcher A, Konovalova T, Black A, Orso E, Liebisch G, Ahrens M, Eisenacher M, Meyer HE, Schmitz G.
Journal name Transfusion
Publication year 2015
Sample Platelets
Sample name PL-Exs - Rep 1
Isolation/purification methods Differential centrifugation
Filtration
Ultracentrifugation
Optiprep density gradient
Flotation density 1.12-1.15 g/mL
Molecules identified in the study Protein
Lipids
Methods used in the study Western blotting
Mass spectrometry
3
Experiment ID 232
ISEV standards
✘ EV Biophysical techniques
✘ EV Cytosolic markers
✘ EV Membrane markers
✘ EV Negative markers
✘ EV Particle analysis
Identified molecule protein
Identification method Mass spectrometry
PubMed ID 25332113    
Organism Homo sapiens
Experiment description Lipidomic and proteomic characterization of platelet extracellular vesicle subfractions from senescent platelets
Authors Pienimaeki-Roemer A, Kuhlmann K, Bottcher A, Konovalova T, Black A, Orso E, Liebisch G, Ahrens M, Eisenacher M, Meyer HE, Schmitz G.
Journal name Transfusion
Publication year 2015
Sample Platelets
Sample name PL-Exs - Rep 2
Isolation/purification methods Differential centrifugation
Filtration
Ultracentrifugation
Optiprep density gradient
Flotation density 1.12-1.15 g/mL
Molecules identified in the study Protein
Methods used in the study Mass spectrometry
4
Experiment ID 233
ISEV standards
✘ EV Biophysical techniques
✘ EV Cytosolic markers
✘ EV Membrane markers
✘ EV Negative markers
✘ EV Particle analysis
Identified molecule protein
Identification method Mass spectrometry
PubMed ID 25332113    
Organism Homo sapiens
Experiment description Lipidomic and proteomic characterization of platelet extracellular vesicle subfractions from senescent platelets
Authors Pienimaeki-Roemer A, Kuhlmann K, Bottcher A, Konovalova T, Black A, Orso E, Liebisch G, Ahrens M, Eisenacher M, Meyer HE, Schmitz G.
Journal name Transfusion
Publication year 2015
Sample Platelets
Sample name PL-Exs - Rep 3
Isolation/purification methods Differential centrifugation
Filtration
Ultracentrifugation
Optiprep density gradient
Flotation density 1.12-1.15 g/mL
Molecules identified in the study Protein
Methods used in the study Mass spectrometry
5
Experiment ID 141
ISEV standards
✔
EM
EV Biophysical techniques
✔
HSP70|HSP90|RAB5
EV Cytosolic markers
✔
LAMP2|CD9
EV Membrane markers
✔
HSP90B1
EV Negative markers
✘ EV Particle analysis
Identified molecule protein
Identification method
Mass spectrometry [QTOF]   
PubMed ID 22723089    
Organism Homo sapiens
Experiment description Prostate cancer cell derived exosomes
Authors Hosseini-Beheshti E, Guns ES.
Journal name MCP
Publication year 2012
Sample Prostate cancer cells
Sample name VCaP - Rep 3
Isolation/purification methods Sucrose density gradient
Flotation density -
Molecules identified in the study Protein
Methods used in the study Mass spectrometry [QTOF]
6
Experiment ID 144
ISEV standards
✔
EM
EV Biophysical techniques
✔
HSP70|HSP90|RAB5
EV Cytosolic markers
✔
CD9
EV Membrane markers
✔
HSP90B1
EV Negative markers
✘ EV Particle analysis
Identified molecule protein
Identification method
Mass spectrometry [QTOF]   
PubMed ID 22723089    
Organism Homo sapiens
Experiment description Prostate cancer cell derived exosomes
Authors Hosseini-Beheshti E, Guns ES.
Journal name MCP
Publication year 2012
Sample Prostate cancer cells
Sample name C4-2 - Rep 2
Isolation/purification methods Sucrose density gradient
Flotation density -
Molecules identified in the study Protein
Methods used in the study Mass spectrometry [QTOF]
7
Experiment ID 145
ISEV standards
✔
EM
EV Biophysical techniques
✔
HSP70|HSP90|RAB5
EV Cytosolic markers
✔
CD10
EV Membrane markers
✔
HSP90B1
EV Negative markers
✘ EV Particle analysis
Identified molecule protein
Identification method
Mass spectrometry [QTOF]   
PubMed ID 22723089    
Organism Homo sapiens
Experiment description Prostate cancer cell derived exosomes
Authors Hosseini-Beheshti E, Guns ES.
Journal name MCP
Publication year 2012
Sample Prostate cancer cells
Sample name C4-2 - Rep 3
Isolation/purification methods Sucrose density gradient
Flotation density -
Molecules identified in the study Protein
Methods used in the study Mass spectrometry [QTOF]
 Protein-protein interactions for PSMA8
  Protein Interactor ExoCarta ID Identification method PubMed Species
No interactions are found.
 Pathways in which PSMA8 is involved
PathwayEvidenceSource
Activation of NF-kappaB in B cells TAS Reactome
Antigen processing: Ubiquitination & Proteasome degradation TAS Reactome
APC/C:Cdc20 mediated degradation of Securin TAS Reactome
APC/C:Cdh1 mediated degradation of Cdc20 and other APC/C:Cdh1 targeted proteins in late mitosis/early G1 TAS Reactome
Asymmetric localization of PCP proteins TAS Reactome
AUF1 (hnRNP D0) destabilizes mRNA TAS Reactome
Autodegradation of the E3 ubiquitin ligase COP1 TAS Reactome
Cdc20:Phospho-APC/C mediated degradation of Cyclin A TAS Reactome
CDK-mediated phosphorylation and removal of Cdc6 TAS Reactome
CDK-mediated phosphorylation and removal of Cdc6 TAS Reactome
CDT1 association with the CDC6:ORC:origin complex TAS Reactome
CLEC7A (Dectin-1) signaling TAS Reactome
Cross-presentation of soluble exogenous antigens (endosomes) TAS Reactome
Dectin-1 mediated noncanonical NF-kB signaling TAS Reactome
degradation of AXIN TAS Reactome
Degradation of beta-catenin by the destruction complex TAS Reactome
degradation of DVL TAS Reactome
Degradation of GLI1 by the proteasome TAS Reactome
Degradation of GLI2 by the proteasome TAS Reactome
ER-Phagosome pathway TAS Reactome
GLI3 is processed to GLI3R by the proteasome TAS Reactome
Hedgehog 'on' state TAS Reactome
Hedgehog ligand biogenesis TAS Reactome
Hh mutants that don't undergo autocatalytic processing are degraded by ERAD TAS Reactome
Orc1 removal from chromatin TAS Reactome
Orc1 removal from chromatin TAS Reactome
Regulation of activated PAK-2p34 by proteasome mediated degradation TAS Reactome
Regulation of ornithine decarboxylase (ODC) TAS Reactome
SCF-beta-TrCP mediated degradation of Emi1 TAS Reactome
Separation of Sister Chromatids TAS Reactome
Ubiquitin Mediated Degradation of Phosphorylated Cdc25A TAS Reactome
Ubiquitin-dependent degradation of Cyclin D1 TAS Reactome
Vif-mediated degradation of APOBEC3G TAS Reactome
Vpu mediated degradation of CD4 TAS Reactome





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