Detects human PU.1/Spi-1 in direct ELISAs and Western blots. In direct ELISAs, no cross-reactivity with recombinant human (rh) Spi-B, recombinant mouse (rm) PU.1/Spi-1, or rmSpi-B is observed. In Western blots, approximately 25% cross-reactivity with rhSpi-B and rmPU.1/Spi-1 is observed.

Clonality

Monoclonal

Host

Mouse

Isotype

IgG_2B

Scientific Data Images for Human PU.1/Spi-1 Antibody

Detection of Human PU.1/Spi‑1 by Western Blot.

Western blot shows lysates of K562 human chronic myelogenous leukemia cell line and Daudi human Burkitt's lymphoma cell line. PVDF membrane was probed with 2 µg/mL of Mouse Anti-Human PU.1/Spi-1 Monoclonal Antibody (Catalog # MAB5870) followed by HRP-conjugated Anti-Mouse IgG Secondary Antibody (Catalog # HAF007). A specific band was detected for PU.1/Spi-1 at approximately 40 kDa (as indicated). This experiment was conducted under reducing conditions and using Immunoblot Buffer Group 1.

Detection of PU.1/Spi‑1 in THP‑1 Human Cell Line by Flow Cytometry.

THP-1 human acute monocytic leukemia cell line was stained with Mouse Anti-Human PU.1/Spi-1 Monoclonal Antibody (Catalog # MAB5870, filled histogram) or isotype control antibody (Catalog # MAB004, open histogram), followed by Phycoerythrin-conjugated Anti-Mouse IgG Secondary Antibody (Catalog # F0102B). To facilitate intracellular staining, cells were fixed with paraformaldehyde and permeabilized with saponin.

Applications for Human PU.1/Spi-1 Antibody

Application

Recommended Usage

CyTOF-ready

Ready to be labeled using established conjugation methods. No BSA or other carrier proteins that could interfere with conjugation.

Intracellular Staining by Flow Cytometry

2.5 µg/10⁶ cells
Sample: THP‑1 human acute monocytic leukemia cell line fixed with paraformaldehyde and permeabilized with saponin

Western Blot

2 µg/mL
Sample: K562 human chronic myelogenous leukemia cell line and Daudi human Burkitt's lymphoma cell line

Please Note: Optimal dilutions of this antibody should be experimentally determined.

Formulation, Preparation, and Storage

Purification

Protein A or G purified from hybridoma culture supernatant

Reconstitution

Sterile PBS to a final concentration of 0.5 mg/mL. For liquid material, refer to CoA for concentration.

Formulation

Lyophilized from a 0.2 μm filtered solution in PBS with Trehalose. *Small pack size (SP) is supplied either lyophilized or as a 0.2 µm filtered solution in PBS.

Shipping

Lyophilized product is shipped at ambient temperature. Liquid small pack size (-SP) is shipped with polar packs. Upon receipt, store immediately at the temperature recommended below.

Stability & Storage

Use a manual defrost freezer and avoid repeated freeze-thaw cycles.

12 months from date of receipt, -20 to -70 °C as supplied.
1 month, 2 to 8 °C under sterile conditions after reconstitution.
6 months, -20 to -70 °C under sterile conditions after reconstitution.

Background: PU.1/Spi-1

PU.1 (Purine-rich nucleic acid binding protein 1; also 31 kDa transforming protein and SPI-1) is a member of the PU subfamily, ETS family of transcription factors. Although its predicted MW is 31 kDa, it appears to run anomalously high in SDS-PAGE at 40‑45 kDa. PU.1 is a monomeric hematopoietic protein that regulates the differentiation of early myeloid and lymphoid progenitors. High PU.1 levels favor granulocyte and macrophage production, while low levels generate magakaryocytes, erythrocytes, T and B cells. Human PU.1 is 270 amino acids (aa) in length. It contains an N-terminal acidic/polyGln transactivation region (aa 34‑99), a non‑destabilizing PEST sequence (aa 117‑165) and a C-terminal Ets DNA-binding domain (aa 170‑253). PU.1 is phosphorylated on Ser146, allowing it to bind to Pip. Over aa 1‑169, human PU.1 shares 88% aa identity with mouse PU.1.

Long Name

Hematopoietic transcription factor PU.1

Alternate Names

OF, SFPI1, Spi-1, SPI-A, SPI1

Entrez Gene IDs

6688 (Human); 20375 (Mouse); 366126 (Rat)

Gene Symbol

SPI1

UniProt

NP_001074016

Additional PU.1/Spi-1 Products

Product Documents for Human PU.1/Spi-1 Antibody

Product Datasheets

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COA

SDS

Download SDS

Product Specific Notices for Human PU.1/Spi-1 Antibody

For research use only

Citations
Reviews

Calculators
Flow Cytometry

Human PU.1/Spi-1 Antibody

R&D Systems, part of Bio-Techne | Catalog # MAB5870

Key Product Details

Species Reactivity

Applications

Label

Antibody Source

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Product Specifications

Immunogen

Specificity