PPP1R14A Knockout HAP1 Cell Line

The choice depends on whether you are studying PPP1R14A (CPI-17, PKC-potentiated inhibitor of PP1)'s role as the principal phosphorylation-activated PP1 inhibitor or its function in regulating smooth muscle and non-muscle myosin phosphatase. The Knockout line is the standard tool for asking whether CPI-17 is required for myosin phosphatase inhibition — CPI-17 phosphorylated at T38 by PKC and ROCK becomes a potent PP1c-MYPT1 myosin phosphatase inhibitor, sustaining myosin light chain phosphorylation. Overexpression is useful for studying CPI-17 phospho-mimetic (T38D) constitutive inhibition. For smooth muscle contractility research, the EDITGENE CPI-17 Knockout in HAP1 enables mechanistic study of myosin phosphatase regulation — though physiological smooth muscle contractility requires smooth muscle cell models. Rescue with wild-type, phospho-deficient (T38A), or phospho-mimetic (T38D) CPI-17 enables comprehensive mechanism studies. The knockout is valuable for studying smooth muscle calcium sensitization mechanisms relevant to vascular tone, asthma, and other smooth muscle disorders.

Primary applications: • Myosin phosphatase regulation: phospho-myosin light chain (S19) Western blot to assess CPI-17-mediated MYPT1-PP1c inhibition. • PKC and ROCK substrate analysis: phospho-CPI-17 (T38) Western blot following PMA or thrombin stimulation given PKC- and ROCK-mediated CPI-17 activation. • Calcium sensitization mechanism: in heterologous smooth muscle-relevant contexts, calcium sensitivity of contractile responses. • Phospho-mimetic studies: rescue with T38D phospho-mimetic CPI-17 generates constitutively active PP1 inhibitor for gain-of-function studies. EDITGENE recommends this model for researchers investigating myosin phosphatase regulation, smooth muscle calcium sensitization, and PP1 inhibitor biology relevant to vascular tone.

Yes. CPI-17 rescue experiments are well-established for myosin phosphatase research: • Construct design: use a codon-modified PPP1R14A sequence with a small C-terminal tag (FLAG, HA). CPI-17 is small (~17 kDa) with regulatory N-terminal region containing T38 phospho-site and PHIN domain — preserve all elements. • Phospho-deficient rescue: T38A mutation abolishes phosphorylation-activated PP1 inhibition. • Phospho-mimetic rescue: T38D mutation creates constitutively active CPI-17 mimicking PKC/ROCK-phosphorylated state — useful for gain-of-function studies of myosin phosphatase inhibition. • Functional readout: rescue should restore PKC/ROCK-activated myosin phosphatase inhibition and phospho-MLC retention. HAP1-specific considerations: • Diploidization: HAP1 cells gradually diploidize during extended culture — confirm ploidy by flow cytometry at the time of phenotypic assay. • Integration site sensitivity: position effects on transgene expression are more pronounced in near-haploid backgrounds; generating multiple independent rescue clones is strongly recommended. • Transduction efficiency: HAP1 transduces with lentivirus at moderate efficiency — increase MOI compared to standard immortalized lines.