PPP1R3F Knockout HAP1 Cell Line

The choice depends on whether you are studying PPP1R3F's role as a brain-enriched PP1 regulatory subunit involved in glycogen metabolism or its emerging functions in neuronal biology. The Knockout line is appropriate for asking whether PPP1R3F is required for PP1 targeting to glycogen synthase and related substrates — PPP1R3F belongs to the PP1 glycogen-targeting subunit family (PPP1R3A/PTG, PPP1R3B/GL, PPP1R3C/PTG, PPP1R3D, PPP1R3E, PPP1R3F) with members showing tissue-specific expression. Overexpression is useful for studying glycogen metabolism in heterologous expression contexts. Important consideration: PPP1R3 family members show partial functional overlap — single PPP1R3F knockout in HAP1 may show modest phenotypes if other glycogen-targeting subunits compensate. Rescue with wild-type PPP1R3F is the standard specificity control. The knockout is valuable for studying PP1 glycogen-targeting subunit specialization and tissue-specific glycogen metabolism.

Primary applications: • Glycogen synthase regulation: phospho-glycogen synthase (S641, S645) analysis to assess PPP1R3F-dependent PP1 dephosphorylation. • Cellular glycogen content: glycogen quantification (PAS staining or biochemical glycogen assay) under various glucose conditions. • Glycogen-targeting subunit dissection: parallel analysis with other PPP1R3 family knockouts for paralog-specific function characterization. • Discovery proteomics: phosphoproteomics in the knockout to identify candidate PPP1R3F-dependent substrates beyond classical glycogen metabolism. EDITGENE recommends this model for researchers investigating PP1 glycogen-targeting subunit biology.

Yes. PPP1R3F rescue experiments require attention to PP1 binding: • Construct design: use a codon-modified PPP1R3F sequence with a small C-terminal tag (FLAG, HA). Preserve the carbohydrate-binding module and PP1-binding RVxF motif. • PP1-binding-deficient rescue: RVxF motif mutations (typically V→A in the canonical RVxF) abolish PP1 binding and serve as standard specificity controls. • Discovery-oriented rescue: parallel wild-type rescue during phenotypic characterization distinguishes PPP1R3F-dependent phenotypes. • Functional readout: rescue should restore PP1-PPP1R3F holoenzyme formation and glycogen-related substrate dephosphorylation. 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.