Gene description for CA4
Gene name carbonic anhydrase IV
Gene symbol CA4
Other names/aliases CAIV
Car4
RP17
Species Homo sapiens
 Database cross references - CA4
ExoCarta ExoCarta_762
Entrez Gene 762
HGNC 1375
MIM 114760
UniProt P22748  
 CA4 identified in exosomes derived from the following tissue/cell type
B cells 20458337    
B cells 20458337    
Urine 15326289    
Urine 19056867    
Urine 22418980    
Urine 22418980    
 Gene ontology annotations for CA4
Molecular Function
    zinc ion binding GO:0008270 IEA
    protein binding GO:0005515 IPI
    carbonate dehydratase activity GO:0004089 TAS
Biological Process
    small molecule metabolic process GO:0044281 TAS
    one-carbon metabolic process GO:0006730 IEA
    response to steroid hormone GO:0048545 IEA
    response to drug GO:0042493 IEA
    organ development GO:0048513 IEA
    bicarbonate transport GO:0015701 TAS
Subcellular Localization
    brush border membrane GO:0031526 IDA
    perinuclear region of cytoplasm GO:0048471 IDA
    basolateral plasma membrane GO:0016323 IDA
    endoplasmic reticulum-Golgi intermediate compartment GO:0005793 IDA
    apical plasma membrane GO:0016324 IDA
    Golgi apparatus GO:0005794 IDA
    anchored component of external side of plasma membrane GO:0031362 IDA
    extracellular exosome GO:0070062 IDA
    trans-Golgi network GO:0005802 IDA
    secretory granule membrane GO:0030667 IDA
    membrane GO:0016020 TAS
    rough endoplasmic reticulum GO:0005791 IDA
    sarcolemma GO:0042383 IEA
    sarcoplasmic reticulum GO:0016529 IEA
    transport vesicle membrane GO:0030658 IDA
    cell surface GO:0009986 IDA
    plasma membrane GO:0005886 TAS
 Experiment description of studies that identified CA4 in exosomes
1
Experiment ID 79
ISEV standards
✘ EV Biophysical techniques
✘ EV Cytosolic markers
✔
CD81|MHCII
EV Membrane markers
✘ EV Negative markers
✘ EV Particle analysis
Identified molecule protein
Identification method Mass spectrometry
PubMed ID 20458337    
Organism Homo sapiens
Experiment description MHC class II-associated proteins in B-cell exosomes and potential functional implications for exosome biogenesis - Sample 1
Authors Buschow SI, van Balkom BW, Aalberts M, Heck AJ, Wauben M, Stoorvogel W.
Journal name ICB
Publication year 2010
Sample B cells
Sample name RN (HLA-DR15)
Isolation/purification methods Differential centrifugation
Sucrose density gradient
Immunobeads (MHC Class II)
Flotation density -
Molecules identified in the study Protein
Methods used in the study Mass spectrometry [FT-ICR]
Western blotting
2
Experiment ID 80
ISEV standards
✘ EV Biophysical techniques
✘ EV Cytosolic markers
✔
CD81|MHCII
EV Membrane markers
✘ EV Negative markers
✘ EV Particle analysis
Identified molecule protein
Identification method Mass spectrometry
PubMed ID 20458337    
Organism Homo sapiens
Experiment description MHC class II-associated proteins in B-cell exosomes and potential functional implications for exosome biogenesis -Sample 2
Authors Buschow SI, van Balkom BW, Aalberts M, Heck AJ, Wauben M, Stoorvogel W.
Journal name ICB
Publication year 2010
Sample B cells
Sample name RN (HLA-DR15)
Isolation/purification methods Differential centrifugation
Sucrose density gradient
Immunobeads (MHC Class II)
Flotation density -
Molecules identified in the study Protein
Methods used in the study Mass spectrometry [FT-ICR]
Western blotting
3
Experiment ID 13
ISEV standards
✔
IEM
EV Biophysical techniques
✔
Alix|RAB4|RAB5B|RAB11|TSG101
EV Cytosolic markers
✔
CD9|AQP2|AQP1
EV Membrane markers
✘ EV Negative markers
✘ EV Particle analysis
Identified molecule protein
Identification method Mass spectrometry
PubMed ID 15326289    
Organism Homo sapiens
Experiment description Identification and proteomic profiling of exosomes in human urine.
Authors Pisitkun T, Shen RF, Knepper MA
Journal name PNAS
Publication year 2004
Sample Urine
Sample name Urine - Normal
Isolation/purification methods Ultracentrifugation
Flotation density -
Molecules identified in the study Protein
Methods used in the study Mass spectrometry [LCQ DECA XP]
Western blotting
4
Experiment ID 63
ISEV standards
✘ EV Biophysical techniques
✘ EV Cytosolic markers
✔
AQP2
EV Membrane markers
✘ EV Negative markers
✘ EV Particle analysis
Identified molecule protein
Identification method Mass spectrometry
PubMed ID 19056867    
Organism Homo sapiens
Experiment description Large-scale proteomics and phosphoproteomics of urinary exosomes.
Authors Gonzales PA, Pisitkun T, Hoffert JD, Tchapyjnikov D, Star RA, Kleta R, Wang NS, Knepper MA
Journal name JASN
Publication year 2009
Sample Urine
Sample name Urine - Normal
Isolation/purification methods Differential centrifugation
Flotation density -
Molecules identified in the study Protein
Methods used in the study Mass spectrometry [LTQ]
Western blotting
5
Experiment ID 196
ISEV standards
✔
EM
EV Biophysical techniques
✔
Alix|TSG101|HSP70
EV Cytosolic markers
✔
CD9
EV Membrane markers
✘ EV Negative markers
✘ EV Particle analysis
Identified molecule protein
Identification method Mass spectrometry
PubMed ID 22418980    
Organism Homo sapiens
Experiment description A multiplex quantitative proteomics strategy for protein biomarker studies in urinary exosomes.
Authors Raj DA, Fiume I, Capasso G, Pocsfalvi G.
Journal name Kidney Int
Publication year 2012
Sample Urine
Sample name Urine - Normal high density
Isolation/purification methods Differential centrifugation
Sucrose cushion
Flotation density -
Molecules identified in the study Protein
Methods used in the study Mass spectrometry
6
Experiment ID 197
ISEV standards
✔
EM
EV Biophysical techniques
✔
Alix|TSG101|HSP70
EV Cytosolic markers
✔
CD9
EV Membrane markers
✘ EV Negative markers
✘ EV Particle analysis
Identified molecule protein
Identification method Mass spectrometry
PubMed ID 22418980    
Organism Homo sapiens
Experiment description A multiplex quantitative proteomics strategy for protein biomarker studies in urinary exosomes.
Authors Raj DA, Fiume I, Capasso G, Pocsfalvi G.
Journal name Kidney Int
Publication year 2012
Sample Urine
Sample name Urine - Normal low density
Isolation/purification methods Differential centrifugation
Sucrose cushion
Flotation density -
Molecules identified in the study Protein
Methods used in the study Mass spectrometry
 Protein-protein interactions for CA4
  Protein Interactor ExoCarta ID Identification method PubMed Species
1 SLC4A1 6521
Invitro Homo sapiens
2 SLC4A3  
Invivo Homo sapiens
Invitro Homo sapiens
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