Protein interacting with C kinase 1 (PICK1) is a PDZ-domain containing protein that is located in the perinuclear region and is phosphorylated in response to PKCα activation. PKCα, which is essential for the regulation of proliferation and differentiation in numerous cell types, contains within its catalytic region a PDZ-binding domain that is absent from other PKC isoforms. Mutation of the PICK1 PDZ domain inhibits the binding of PICK1 to PKCα. PICK1 also interacts with the carboxy terminus of a-amino-3-hydroxy-5-methyl-isoxazole-4-propionic acid (AMPA) receptor, a neurotransmitter receptor located at excitatory synapses, suggesting that PICK1 plays a role in the modulation of synaptic transmission by targeting and anchoring AMPA to specific synapses.
Background References
1. Shao X et al. Threonine 82 at the PDZ domain of PICK1 is critical for AMPA receptor interaction and localization. Neurochem Int 56:962-970 (2010).
2. Takeya R et al. Interaction of the PDZ domain of human PICK1 with class I ADP-ribosylation factors. Biochem Biophys Res Commun 267:149-155 (2000).
Tissue Specificity
Ubiquitous.
Post-translational Modification
Phosphorylation at Thr-82 appears to inhibit the interaction with AMPA receptors.; Palmitoylation on Cys-413 is essential for long-term synaptic depression (LTD).
Western blot analysis of PICK1 on different lysates with Rabbit anti-PICK1 antibody (ET7108-60) at 1/5,000 dilution.
Lane 1: HeLa (Human cervical adenocarcinoma cell) cell lysate Lane 2: MCF7 (Human breast cancer cell) cell lysate Lane 3: 293T (Human embryonic kidney cell) cell lysate Lane 4: LNCaP (Human prostate cancer cell) cell lysate
Lysates/proteins at 15 µg/Lane. Exposure time: 10 seconds; ECL: K1801
Blocking: 5% NFDM/TBST, 1 hour at room temperature Primary antibody: ET7108-60, 1/5,000 in primary antibody dilution buffer (K1803), overnight at 4 ℃ Secondary antibody: Goat anti-Rabbit IgG-HRP (HA1001), 1/50,000 in 5% NFDM/TBST, 1 hour at room temperature
Predicted band size: 47 kDa Observed band size: 47 kDa
Flow cytometric analysis of PICK1 was done on 293T cells. The cells were fixed, permeabilized and stained with the primary antibody (ET7108-60, 1/50) (purple). After incubation of the primary antibody at room temperature for an hour, the cells were stained with a Alexa Fluor 488-conjugated Goat anti-Rabbit IgG Secondary antibody at 1/1000 dilution for 30 minutes.Unlabelled sample was used as a control (cells without incubation with primary antibody; yellow).
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