Anti-CD55 Antibody Picoband® (monoclonal, 5B9E1)

Overview

Anti-CD55 Antibody Picoband® (monoclonal, 5B9E1) is an antibody reagent for detection of CD55 (UPF1 regulator of nonsense transcripts homolog (yeast)). Researchers commonly use anti-CD55 antibodies to measure relative expression and localization across biological samples, with assay selection guided by the listed applications (WB, IHC, IF, ICC, Flow, ELISA).

Boster Bio Anti-CD55 Antibody Picoband® (monoclonal, 5B9E1) catalog # M00910-4. Tested in IF, IHC, ICC, WB applications. This antibody reacts with Human. The brand Picoband indicates this is a premium antibody that guarantees superior quality, high affinity, and strong signals with minimal background in Western blot applications. Only our best-performing antibodies are designated as Picoband, ensuring unmatched performance.

Key elements and design rationale

• Target: CD55 (UPF1 regulator of nonsense transcripts homolog (yeast)). Alternative names: ATP dependent helicase RENT1 antibody; ATP-dependent helicase RENT1 antibody; Delta helicase antibody; FLJ43809 antibody; FLJ46894 antibody; HUPF 1 antibody; hUpf1 antibody; KIAA0221 antibody; Nonsense mRNA reducing factor 1 antibody; NORF 1 antibody; NORF1 antibody; pNORF 1 antibody; pNORF1 antibody; Regulator of nonsense transcripts 1 antibody; RENT 1 antibody; RENT1 antibody; RENT1_HUMAN antibody; Smg 2 antibody; Smg 2 homolog nonsense mediated mRNA decay factor antibody; UP Frameshift 1 antibody; Up frameshift mutation 1 homolog (S. cerevisiae) antibody; Up frameshift mutation 1 homolog antibody; Up frameshift suppressor 1 homolog antibody; Up-frameshift suppressor 1 homolog antibody; UPF 1 antibody; UPF 1 regulator of nonsense transcripts homolog antibody; upf1 antibody; UPF1 regulator of nonsense transcripts homolog antibody; Yeast Upf1p homolog antibody
• Antibody format: Monoclonal; clone 5B9E1; Mouse IgG1
• Species context: Host: Mouse, Reactivity: Human
• Purification: Immunogen affinity purified.
• Immunogen: E.coli-derived human CD55 recombinant protein (Position: D35-K347). Human CD55 shares 49.1% amino acid (aa) sequence identity with mouse CD55.
• Molecular weight context: observed 70-75 kDa (reported)
• Provided application(s): WB, IHC, IF, ICC, Flow, ELISA

These attributes help contextualize how the antibody is commonly selected (host/clonality/isotype/label) and how signals are interpreted across sample types and assay formats.

Biological background

Function: RNA-dependent helicase and ATPase required for nonsense-mediated decay (NMD) of mRNAs containing premature stop codons. Is recruited to mRNAs upon translation termination and undergoes a cycle of phosphorylation and dephosphorylation; its phosphorylation appears to be a key step in NMD. Recruited by release factors to stalled ribosomes together with the SMG1C protein kinase complex to form the transient SURF (SMG1-UPF1-eRF1-eRF3) complex. In EJC-dependent NMD, the SURF complex associates with the exon junction complex (EJC) (located 50-55 or more nucleotides downstream from the termination codon) through UPF2 and allows the formation of an UPF1-UPF2-UPF3 surveillance complex which is believed to activate NMD. Phosphorylated UPF1 is recognized by EST1B/SMG5, SMG6 and SMG7 which are thought to provide a link to the mRNA degradation machinery involving exonucleolytic and endonucleolytic pathways, and to serve as adapters to protein phosphatase 2A (PP2A), thereby triggering UPF1 dephosphorylation and allowing the recycling of NMD factors. UPF1 can also activate NMD without UPF2 or UPF3, and in the absence of the NMD-enhancing downstream EJC indicative for alternative NMD pathways. Plays a role in replication-dependent histone mRNA degradation at the end of phase S; the function is independent of UPF2. For the recognition of premature termination codons (PTC) and initiation of NMD a competitive interaction between UPF1 and PABPC1 with the ribosome-bound release factors is proposed. The ATPase activity of UPF1 is required for disassembly of mRNPs undergoing NMD. Essential for embryonic viability.

Cellular localization: Nucleus. Cytoplasm. P-body.

Tissue details: Ubiquitous.

Background: Complement decay-accelerating factor, also known as CD55 or DAF, is a protein that, in humans, is encoded by the CD55 gene. This gene encodes a glycoprotein involved in the regulation of the complement cascade. Binding of the encoded protein to complement proteins accelerates their decay, thereby disrupting the cascade and preventing damage to host cells. Antigens present on this protein constitute the Cromer blood group system (CROM). Alternative splicing results in multiple transcript variants. The predominant transcript variant encodes a membrane-bound protein, but alternatively spliced transcripts may produce soluble proteins.

Cross reactivity: No cross-reactivity with other proteins.

Research relevance and current trends

• Quantitative and spatial profiling: expression patterns are increasingly studied across cell states using multiplex imaging and omics-informed validation.
• Isoforms and post-translational modifications: researchers often evaluate how isoform composition and PTMs can shift apparent molecular weight or localization.
• Context-aware interpretation: comparative studies commonly include perturbations (stimulation, inhibition, genetic models) to relate target changes to pathway behavior.

Common research applications

• Western blot (WB): compare relative target abundance and apparent size shifts (e.g., isoforms/PTMs) across conditions.
• Immunohistochemistry (IHC): assess distribution across tissue compartments and compare staining patterns between groups.
• Immunofluorescence / ICC: evaluate subcellular localization and co-localization with compartment markers.
• Flow cytometry: quantify target-positive populations and compare shifts after stimulation or differentiation.

Across these uses, researchers typically interpret changes in signal as relative differences between matched sample groups, considering sample preparation and biological context.

Notes for experimental interpretation

• Apparent molecular weight can vary due to isoforms, proteolysis, glycosylation, phosphorylation, and sample preparation differences.
• Species reactivity and epitope conservation can influence observed signal patterns, especially in cross-species studies.
• Control concepts: include appropriate negative controls (e.g., isotype controls where relevant) and, when feasible, genetic or orthogonal controls (KO/KD, peptide competition, or independent assays) to support interpretation.

For antibody reagents, monoclonal antibodies are often chosen for epitope consistency across lots, while polyclonals may recognize multiple epitopes and can show different background characteristics depending on context.

Customization & Add-ons: Can’t find the antibody you need—or require a custom format for your assay? We can help you source the best match or support custom antibody solutions for diverse research needs, including species and isotype selection, conjugations and labeling (e.g., HRP/AP, biotin, fluorophores), purification grade options (Protein A/G, affinity purified), formulation preferences (buffer selection, carrier-free, glycerol-free), custom concentrations and aliquoting, low-endotoxin options for cell-based work, and application-focused QC/validation support (project dependent). Click Talk to a Scientist to submit a request, email us at support@biohippo.com, or explore our Research Services for additional support—our team will follow up with feasibility details and next steps.