4E-BP3 CRISPR/Cas9 KO Plasmid (h2): sc-406304-KO-2

Overview

EIF4EBP3 encodes 4E-BP3, a phosphorylation-sensitive inhibitor of cap-dependent mRNA translation that binds eIF4E and limits assembly of the eIF4F initiation complex. As a member of the 4E-BP family, 4E-BP3 functions downstream of PI3K–AKT–mTOR signaling, where mTORC1-mediated phosphorylation relieves eIF4E sequestration to increase selective translation of growth, stress-response, and metabolic transcripts. Through this control of translational output, EIF4EBP3 contributes to regulation of cell proliferation, survival programs, and adaptation to nutrient and energy cues. Dysregulation of the mTOR–eIF4E axis and altered 4E-BP activity are frequently implicated in oncogenic signaling and other disorders featuring aberrant proteostasis and metabolic rewiring, motivating mechanistic studies of EIF4EBP3 in these contexts.

4E-BP3 CRISPR/Cas9 KO Plasmid (h2) is a pool of plasmids designed for targeted disruption of the EIF4EBP3 gene in human cell lines. Each plasmid in the pool co-expresses a unique sgRNA, targeting a distinct site within the EIF4EBP3 locus, alongside the Streptococcus pyogenes Cas9 nuclease, and encodes GFP to enable fluorescent identification and enrichment of successfully transfected cells. This multi-guide strategy increases the likelihood of inducing frameshifts or deletions that produce a functional knockout, offering a more robust alternative to single-guide approaches. DSBs induced at multiple sites are resolved through non-homologous end joining (NHEJ) or, when used with the included HDR donor template, homology-directed repair (HDR) at a defined target site within the locus.

When used in conjunction with the RFP-expressing HDR donor, GFP and RFP fluorescence can be used together to distinguish transfected from edited cell populations, streamlining flow cytometry-based sorting and clone selection workflows.

Homology-Directed Repair (HDR) Donor — Puromycin Cassette with RFP Reporter

For applications requiring confirmed, selectable knockout clones, 4E-BP3 HDR Plasmid (h2) includes an HDR donor construct containing a puromycin resistance cassette (PuroR) and a red fluorescent protein (RFP) reporter, flanked by homology arms specific to a defined EIF4EBP3 target site.
When co-transfected with 4E-BP3 CRISPR/Cas9 KO Plasmid (h2):

• The PuroR-RFP cassette integrates at the Cas9 cut site via HDR, disrupting the EIF4EBP3 open reading frame.
• RFP fluorescence provides an immediate visual indicator of successful integration, enabling fluorescence-based identification or sorting of edited cells prior to or alongside puromycin selection.
• Successfully edited cells are confirmed through puromycin resistance, substantially reducing clone screening burden.
• This selection strategy is ideal for generating stable, clonal KO cell lines for downstream functional studies, drug screening, or model development.

Cre-lox Cassette Removal System

The HDR donor construct features loxP sites flanking the PuroR-RFP selection cassette to allow clean marker removal following clone confirmation. Transient expression of Cre recombinase via the included Cre Vector: sc-418923 excises the cassette, leaving a minimal residual loxP site within the EIF4EBP3 locus and eliminating potential confounding effects on downstream assays.
This two-step approach:

• Minimizes disruption to local chromatin architecture and neighboring regulatory elements
• Restores a near-native genomic context at the edited locus
• Enables reuse of the puromycin selection strategy in the same cell line for additional edits

Key Features

• gRNA targeting EIF4EBP3 exon(s) critical for 4E-BP3 function
• Co-expression of SpCas9 and sgRNA from a single plasmid for simplified delivery
• HDR donor with puromycin resistance for positive clone selection
• loxP-flanked PuroR cassette with Cre recombinase vector for seamless marker removal
• Supplied ready to use for delivery by transfection

For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.