Caveolin-1 is a protein that in humans is encoded by the CAV1 gene. The scaffolding protein encoded by this gene is the main component of the caveolae plasma membranes found in most cell types. The protein links integrin subunits to the tyrosine kinase FYN, an initiating step in coupling integrins to the Ras-ERK pathway and promoting cell cycle progression. The gene is a tumor suppressor gene candidate and a negative regulator of the Ras-p42/44 MAP kinase cascade. CAV1 and CAV2 are located next to each other on chromosome 7 and express colocalizing proteins that form a stable hetero-oligomeric complex. By using alternative initiation codons in the same reading frame, two isoforms (alpha and beta) are encoded by a single transcript from this gene. Caveolin 1 has been shown to interact with heterotrimeric G proteins, Src tyrosine kinases (Src, Lyn) and H-Ras, cholesterol, TGF beta receptor 1, endothelial NOS, androgen receptor, amyloid precursor protein, gap junction protein, alpha 1, nitric oxide synthase 2A, epidermal growth factor receptor, endothelin receptor type B, PDGFRB, PDGFRA, PTGS2, TRAF2, estrogen receptor alpha, caveolin 2, PLD2, Bruton's tyrosine kinase and SCP2. All these interactions are through a caveolin-scaffolding domain (CSD) within caveolin-1 molecule. Molecules that interact with caveolin-1 contain caveolin-binding motifs (CBM).
Background References
1. Hwangbo C. et al. Syntenin regulates TGF-beta1-induced Smad activation and the epithelial-to-mesenchymal transition by inhibiting caveolin-mediated TGF-beta type I receptor internalization. Oncogene 35:389-401(2016)
2. McMahon K.A. et al. SRBC/cavin-3 is a caveolin adapter protein that regulates caveolae function. EMBO J. 28:1001-1015(2009)
Sequence Similarity
Belongs to the caveolin family.
Tissue Specificity
Skeletal muscle, liver, stomach, lung, kidney and heart (at protein level). Expressed in the brain.
Post-translational Modification
Ubiquitinated. Undergo monoubiquitination and multi- and/or polyubiquitination. Monoubiquitination of N-terminal lysines promotes integration in a ternary complex with UBXN6 and VCP which promotes oligomeric CAV1 targeting to lysosomes for degradation.; The initiator methionine for isoform 2 is removed during or just after translation. The new N-terminal amino acid is then N-acetylated.; Phosphorylated at Tyr-14 by ABL1 in response to oxidative stress.
Western blot analysis of Caveolin-1 on different lysates with Mouse anti-Caveolin-1 antibody (EM1902-01) at 1/5,000 dilution.
Lane 1: A549 (Human lung adenocarcinoma cell) cell lysate Lane 2: HaCaT (Human immortalized keratinocyte) cell lysate Lane 3: A431 (Human epidermoid carcinoma skin squamous cell) cell lysate Lane 4: Mouse lung tissue lysate Lane 5: Rat lung tissue lysate
Lysates/proteins at 15 µg/Lane. Exposure time: 4 seconds; ECL: K1801
Blocking: 5% NFDM/TBST, 1 hour at room temperature Primary antibody: EM1902-01, 1/5,000 in primary antibody dilution buffer (K1803), overnight at 4 ℃ Secondary antibody: Goat anti-Mouse IgG-HRP (HA1001), 1/50,000 in 5% NFDM/TBST, 1 hour at room temperature
Predicted band size: 20 kDa Observed band size: 20 kDa
Immunohistochemical analysis of paraffin-embedded human lung tissue using anti-Caveolin-1 antibody. The section was pre-treated using heat mediated antigen retrieval with Tris-EDTA buffer (pH 8.0-8.4) for 20 minutes.The tissues were blocked in 5% BSA for 30 minutes at room temperature, washed with ddH2O and PBS, and then probed with the primary antibody (EM1902-01, 1/1000) for 30 minutes at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen. Tissues were counterstained with hematoxylin and mounted with DPX.
Immunohistochemical analysis of paraffin-embedded human lung carcinoma tissue using anti-Caveolin-1 antibody. The section was pre-treated using heat mediated antigen retrieval with Tris-EDTA buffer (pH 8.0-8.4) for 20 minutes.The tissues were blocked in 5% BSA for 30 minutes at room temperature, washed with ddH2O and PBS, and then probed with the primary antibody (EM1902-01, 1/1000) for 30 minutes at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen. Tissues were counterstained with hematoxylin and mounted with DPX.
Immunohistochemical analysis of paraffin-embedded human liver tissue using anti-Caveolin-1 antibody. The section was pre-treated using heat mediated antigen retrieval with Tris-EDTA buffer (pH 8.0-8.4) for 20 minutes.The tissues were blocked in 5% BSA for 30 minutes at room temperature, washed with ddH2O and PBS, and then probed with the primary antibody (EM1902-01, 1/1000) for 30 minutes at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen. Tissues were counterstained with hematoxylin and mounted with DPX.
Immunohistochemical analysis of paraffin-embedded mouse lung tissue using anti-Caveolin-1 antibody. The section was pre-treated using heat mediated antigen retrieval with Tris-EDTA buffer (pH 8.0-8.4) for 20 minutes.The tissues were blocked in 5% BSA for 30 minutes at room temperature, washed with ddH2O and PBS, and then probed with the primary antibody (EM1902-01, 1/1000) for 30 minutes at room temperature. The detection was performed using an HRP conjugated compact polymer system. DAB was used as the chromogen. Tissues were counterstained with hematoxylin and mounted with DPX.
Flow cytometric analysis of Caveolin-1 was done on PANC-1 cells. The cells were fixed, permeabilized and stained with the primary antibody (EM1902-01, 1/50) (red). After incubation of the primary antibody at room temperature for an hour, the cells were stained with a Alexa Fluor 488-conjugated Goat anti-Mouse IgG Secondary antibody at 1/1000 dilution for 30 minutes.Unlabelled sample was used as a control (cells without incubation with primary antibody; black).
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