Journal: Cell Communication and Signaling : CCS
Article Title: CLIP2: a novel functional player in AQP5 trafficking dynamics and implications for Sjögren’s disease
doi: 10.1186/s12964-025-02476-6
Figure Lengend Snippet: Identification of CLIP2 as a protein partner of AQP5. A , B Tandem mass spectra of CLIP2 peptide 634–645, ATLNSGPGAQQK, (+ 2 charged ion, m/z 586.4) from AQP5 IP samples in mouse parotid ( A ) and submandibular SG ( B ). Sequence specific b- and y-ions are labeled. C AQP5 immunoprecipitation (IP) performed using proteins from mouse SGs followed by WB detection using anti-CLIP2 antibodies. Input proteins from mouse submandibular glands (mSMG; lane A) and mouse parotid gland (mPG, lane B); IP performed using mSMG (lanes C, E) and mPG (lanes D, F) proteins in the presence (lanes C, D) or absence (negative controls; lanes E, F) of anti-AQP5 antibody; IP performed in the absence of any input proteins (additional negative control, lane G). D AQP5 IP performed using proteins from NS-SV-AC cells expressing AQP5 followed by WB detection using anti-CLIP2 antibodies. Input proteins from NS-SV-AC cells transfected with HA-hAQP5 (lane A) or SNAP-hAQP5 (lane B); IP performed using NS-SV-AC HA-AQP5 (lanes C, D) and NS-SV-AC SNAP-hAQP5 (lanes E, F) in the presence (lanes C, E) or in the absence (negative controls; lanes D, F) of anti-AQP5 antibody; IP performed in the absence of input proteins (additional negative control, lane G). Considering known batch-to-batch variation of commercial Sepharose-Protein A beads, whereby Protein A can shed from the beads under elution, the non-specific bands of ± 80–100 kDa ( C ) and ± 45–50 kDa ( D ) are likely non-specific bands corresponding in all likelihood to the IgG heavy chain (± 45–50 kDa) coupled or not to protein A (± 45 kDa) shed from the Sepharose beads.HA: hemagglutinin; SNAP: small protein derived from mammalian O6-alkylguanine-DNA-alkyltransferase
Article Snippet: Stable transfection of NS-SV-AC cells with SNAP-hAQP5 or CRISPR/CAS9 CLIP2 dual gRNA vectors was achieved through selection with respectively 5 μg/ml of puromycin or 10 μg/ml of blasticidin (InVivo Gen, San Diego, CA, USA).
Techniques: Sequencing, Labeling, Immunoprecipitation, Negative Control, Expressing, Transfection, Derivative Assay