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42172
SARS-CoV-2 Spike Protein (S1-NTD) (E7M5X) Mouse mAb
Primary Antibodies
Monoclonal Antibody

SARS-CoV-2 Spike Protein (S1-NTD) (E7M5X) Mouse mAb #42172

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Western Blotting Image 1: SARS-CoV-2 Spike Protein (S1-NTD) (E7M5X) Mouse mAb

Western blot analysis of extracts from isolated CoV-2 virions (lane 1), mock-infected Vero-E6 cells (lane 2), and SARS-CoV-2-infected Vero-E6 cells (lane 3), using SARS-CoV-2 Spike Protein (S1-NTD) (E7M5X) Mouse mAb (upper) and GAPDH (D16H11) XP® Rabbit mAb #5174 (lower). The antibody detects full-length (uncleaved) SARS-CoV-2 spike protein, and the fragment corresponding to the S1 domain generated by endogenous protease cleavage. SARS-CoV-2 virions and infected Vero-E6 cells courtesy of Dr. Mohsan Saeed, National Emerging Infectious Diseases Laboratory, Boston University.

Western Blotting Image 2: SARS-CoV-2 Spike Protein (S1-NTD) (E7M5X) Mouse mAb

Western blot analysis of extracts from 293T cells, mock transfected (lane 1) or transiently transfected with expression constructs encoding MycDDK-tagged SARS-CoV-2 Spike (lane 2), MycDDK-tagged SARS-CoV Spike (lane 3), or MycDDK-tagged MERS-CoV Spike (lane 4), using SARS-CoV-2 Spike Protein (S1-NTD) (E7M5X) Mouse mAb (upper), Myc-Tag (71D10) Rabbit mAb #2278 (middle), and β-Actin (D6A8) Rabbit mAb #8457 (lower). The antibody detects full-length (uncleaved) SARS-CoV-2 spike protein, and the fragment corresponding to the S1 domain generated by endogenous protease cleavage. Proteolytic cleavage of SARS-CoV spike is not observed in these experimental conditions (transient transfection).

Western Blotting Image 3: SARS-CoV-2 Spike Protein (S1-NTD) (E7M5X) Mouse mAb

Western blot analysis of SARS-CoV-2 Spike S1-NTD (16-316) Recombinant Protein (8xHis-Tag) #88587 (lane 1), SARS-CoV-2 Spike (trimeric) (16-1208) Recombinant Protein (8xHis-Tag) #65444 (lane 2), SARS-CoV-2 Spike RBD (318-541) Recombinant Protein (8xHis-Tag) #48801 (lane 3), or SARS-CoV-2 Spike RBD (multimeric) (319-591) Recombinant Protein (8xHis-Tag) #17862 (lane 4), using SARS-CoV-2 Spike (S1-NTD) (E7M5X) Mouse mAb (upper) and His-Tag (D3I1O) XP® Rabbit mAb #12698 (lower). Due to the location of the epitope (surrounding Pro25 of SARS-CoV-2 spike protein), the antibody detects recombinant proteins corresponding to the full-length ectodomain and the S1-NTD of SARS CoV-2 Spike protein but does not detect recombinant proteins corresponding only to the receptor binding domain (RBD).

Flow Cytometry Image 1: SARS-CoV-2 Spike Protein (S1-NTD) (E7M5X) Mouse mAb

Flow cytometric analysis of a mix of 293T/hACE2-GFP cells and wild type 293T cells, untreated (left) of incubated with SARS-CoV-2 Spike Recombinant Protein #65444 (30 ug/ml, 10 min; right), using SARS-CoV-2 Spike Protein (S1-NTD) (E7M5X) Mouse mAb. Anti-Rabbit (Alexa Fluor 647® Conjugate) was used as a secondary antibody.

To Purchase # 42172S
Product # Size Price
42172S
100 µl $ 276

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Supporting Data

REACTIVITY Vir
SENSITIVITY Endogenous
MW (kDa) 110, 220
Source/Isotype Mouse IgG1

Application Key:

  • W-Western
  • IP-Immunoprecipitation
  • IHC-Immunohistochemistry
  • ChIP-Chromatin Immunoprecipitation
  • IF-Immunofluorescence
  • F-Flow Cytometry
  • E-P-ELISA-Peptide

Species Cross-Reactivity Key:

  • H-Human
  • M-Mouse
  • R-Rat
  • Hm-Hamster
  • Mk-Monkey
  • Mi-Mink
  • C-Chicken
  • Dm-D. melanogaster
  • X-Xenopus
  • Z-Zebrafish
  • B-Bovine
  • Dg-Dog
  • Pg-Pig
  • Sc-S. cerevisiae
  • Ce-C. elegans
  • Hr-Horse
  • All-All Species Expected

Product Usage Information

Application Dilution
Western Blotting 1:1000
Flow Cytometry 1:400

Storage

Supplied in 10 mM sodium HEPES (pH 7.5), 150 mM NaCl, 100 µg/ml BSA, 50% glycerol and less than 0.02% sodium azide. Store at –20°C. Do not aliquot the antibody.

Protocol

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Western Blotting Protocol

For western blots, incubate membrane with diluted primary antibody in 5% w/v BSA, 1X TBS, 0.1% Tween® 20 at 4°C with gentle shaking, overnight.

NOTE: Please refer to primary antibody product webpage for recommended antibody dilution.

A. Solutions and Reagents

NOTE: Prepare solutions with reverse osmosis deionized (RODI) or equivalent grade water.

  1. 20X Phosphate Buffered Saline (PBS): (#9808) To prepare 1 L 1X PBS: add 50 ml 20X PBS to 950 ml dH2O, mix.
  2. 10X Tris Buffered Saline (TBS): (#12498) To prepare 1 L 1X TBS: add 100 ml 10X to 900 ml dH2O, mix.
  3. 1X SDS Sample Buffer: Blue Loading Pack (#7722) or Red Loading Pack (#7723) Prepare fresh 3X reducing loading buffer by adding 1/10 volume 30X DTT to 1 volume of 3X SDS loading buffer. Dilute to 1X with dH2O.
  4. 10X Tris-Glycine SDS Running Buffer: (#4050) To prepare 1 L 1X running buffer: add 100 ml 10X running buffer to 900 ml dH2O, mix.
  5. 10X Tris-Glycine Transfer Buffer: (#12539) To prepare 1 L 1X Transfer Buffer: add 100 ml 10X Transfer Buffer to 200 ml methanol + 700 ml dH2O, mix.
  6. 10X Tris Buffered Saline with Tween® 20 (TBST): (#9997) To prepare 1 L 1X TBST: add 100 ml 10X TBST to 900 ml dH2O, mix.
  7. Nonfat Dry Milk: (#9999).
  8. Blocking Buffer: 1X TBST with 5% w/v nonfat dry milk; for 150 ml, add 7.5 g nonfat dry milk to 150 ml 1X TBST and mix well.
  9. Wash Buffer: (#9997) 1X TBST.
  10. Bovine Serum Albumin (BSA): (#9998).
  11. Primary Antibody Dilution Buffer: 1X TBST with 5% BSA; for 20 ml, add 1.0 g BSA to 20 ml 1X TBST and mix well.
  12. Biotinylated Protein Ladder Detection Pack: (#7727).
  13. Prestained Protein Marker, Broad Range (11-190 kDa): (#13953).
  14. Blotting Membrane and Paper: (#12369) This protocol has been optimized for nitrocellulose membranes. Pore size 0.2 µm is generally recommended.
  15. Secondary Antibody Conjugated to HRP: Anti-mouse IgG, HRP-linked Antibody (#7076).
  16. Detection Reagent: SignalFire™ ECL Reagent (#6883).

B. Protein Blotting

A general protocol for sample preparation.

  1. Treat cells by adding fresh media containing regulator for desired time.
  2. Aspirate media from cultures; wash cells with 1X PBS; aspirate.
  3. Lyse cells by adding 1X SDS sample buffer (100 µl per well of 6-well plate or 500 µl for a 10 cm diameter plate). Immediately scrape the cells off the plate and transfer the extract to a microcentrifuge tube. Keep on ice.
  4. Sonicate for 10–15 sec to complete cell lysis and shear DNA (to reduce sample viscosity).
  5. Heat a 20 µl sample to 95–100°C for 5 min; cool on ice.
  6. Microcentrifuge for 5 min.
  7. Load 20 µl onto SDS-PAGE gel (10 cm x 10 cm).

    NOTE: Loading of prestained molecular weight markers (#13953, 10 µl/lane) to verify electrotransfer and biotinylated protein ladder (#7727, 10 µl/lane) to determine molecular weights are recommended.

  8. Electrotransfer to nitrocellulose membrane (#12369).

C. Membrane Blocking and Antibody Incubations

NOTE: Volumes are for 10 cm x 10 cm (100 cm2) of membrane; for different sized membranes, adjust volumes accordingly.

I. Membrane Blocking

  1. (Optional) After transfer, wash nitrocellulose membrane with 25 ml TBS for 5 min at room temperature.
  2. Incubate membrane in 25 ml of blocking buffer for 1 hr at room temperature.
  3. Wash three times for 5 min each with 15 ml of TBST.

II. Primary Antibody Incubation

  1. Incubate membrane and primary antibody (at the appropriate dilution and diluent as recommended in the product webpage) in 10 ml primary antibody dilution buffer with gentle agitation overnight at 4°C.
  2. Wash three times for 5 min each with 15 ml of TBST.
  3. Incubate membrane with Anti-mouse IgG, HRP-linked Antibody (#7076 at 1:2000) and Anti-biotin, HRP-linked Antibody (#7075 at 1:1000–1:3000) to detect biotinylated protein markers in 10 ml of blocking buffer with gentle agitation for 1 hr at room temperature.
  4. Wash three times for 5 min each with 15 ml of TBST.
  5. Proceed with detection (Section D).

D. Detection of Proteins

Directions for Use:

  1. Wash membrane-bound HRP (antibody conjugate) three times for 5 minutes in TBST.
  2. Prepare 1X SignalFire™ ECL Reagent (#6883) by diluting one part 2X Reagent A and one part 2X Reagent B (e.g. for 10 ml, add 5 ml Reagent A and 5 ml Reagent B). Mix well.
  3. Incubate substrate with membrane for 1 minute, remove excess solution (membrane remains wet), wrap in plastic and expose to X-ray film.

* Avoid repeated exposure to skin.

posted June 2005

revised June 2020

Protocol Id: 262

Flow Cytometry, Live Cell Protocol for Unconjugated Mouse Antibodies

A. Solutions and Reagents

NOTE: Prepare solutions with reverse osmosis deionized (RODI) or equivalent grade water.

  1. 1X Phosphate Buffered Saline (PBS): To prepare 1 L 1X PBS: add 100 ml 10X PBS (#12528) to 900 ml water mix.
  2. Antibody Dilution Buffer: Purchase ready-to-use Flow Cytometry Antibody Dilution Buffer (#13616), or prepare a 0.5% BSA PBS buffer by dissolving 0.5 g Bovine Serum Albumin (BSA) (#9998) in 100 ml 1X PBS. Store at 4°C.
  3. Recommended Anti-Mouse secondary antibodies::
    • Anti-Mouse IgG (H+L), F(ab')2 Fragment (Alexa Fluor® 488 Conjugate) #4408
    • Anti-Mouse IgG (H+L), F(ab')2 Fragment (Alexa Fluor® 594 Conjugate) #8890
    • Anti-Mouse IgG (H+L), F(ab')2 Fragment (Alexa Fluor® 647 Conjugate) #4410
    • Anti-Mouse IgG (H+L), F(ab')2 Fragment (PE Conjugate) #59997

NOTE: When including fluorescent cellular dyes in your experiment (including viability dyes, DNA dyes, etc.), please refer to the dye product page for the recommended protocol. Visit www.cellsignal.com for a full listing of cellular dyes validated for use in flow cytometry.

B. Immunostaining

NOTE: Count cells using a hemocytometer or alternative method.

NOTE: If using whole blood, lyse red blood cells and wash by centrifugation prior to Immunostaining.

NOTE: Optimal centrifugation conditions will vary depending upon cell type and reagent volume. Generally, 150-300g for 1-5 minutes will be sufficient to pellet the cells.

  1. Aliquot desired number of cells into tubes or wells. (Generally, 5x105 to 1x106 cells per assay.)
  2. Pellet cells by centrifugation and remove supernatant.
  3. Resuspend cells in 100 µl of diluted primary antibody, prepared in Antibody Dilution Buffer at a recommended dilution or as determined via titration.
  4. Incubate for 30 min to 1 hr on ice. Protect from light.
  5. Wash by centrifugation in Antibody Dilution Buffer. Discard supernatant. Repeat.
  6. Resuspend cells in 100 µl of diluted fluorochrome-conjugated secondary antibody (prepared in Antibody Dilution Buffer at the recommended dilution).
  7. Incubate for 30 min on ice. Protect from light.
  8. Wash by centrifugation in Antibody Dilution Buffer. Discard supernatant. Repeat.
  9. Resuspend cells in 200-500 µl of Antibody Dilution Buffer and analyze on flow cytometer.

posted February 2011

revised June 2020

Protocol Id: 58

Specificity / Sensitivity

SARS-CoV-2 Spike Protein (S1-NTD) (E7M5X) Mouse mAb recognizes endogenous levels of total SARS-CoV-2 spike protein. This antibody detects full-length protein, and also detects the S1 fragment generated by furin cleavage. It does not cross-react with spike proteins from SARS or MERS coronaviruses.

Species Reactivity:

Virus

Source / Purification

Monoclonal antibody is produced by immunizing animals with a synthetic peptide corresponding to residues surrounding Pro25 of SARS-CoV-2 spike protein.

Background

The cause of the COVID-19 pandemic is a novel and highly pathogenic coronavirus, termed SARS-CoV-2 (severe acute respiratory syndrome coronavirus-2). SARS-CoV-2 is a member of the Coronaviridae family of viruses (1). The genome of SARS-CoV-2 is similar to other coronaviruses, and is comprised of four key structural proteins: S, the spike protein, E, the envelope protein, M, the membrane protein, and N, the nucleocapsid protein (2). Coronavirus spike proteins are class I fusion proteins and harbor an ectodomain, a transmembrane domain, and an intracellular tail (3,4). The highly glycosylated ectodomain projects from the viral envelope surface and facilitates attachment and fusion with the host cell plasma membrane. The ectodomain can be further subdivided into host receptor-binding domain (RBD) (S1) and membrane-fusion (S2) subunits, which are produced upon proteolysis by host proteases at S1/S2 and S2’ sites. S1 and S2 subunits remain associated after cleavage and assemble into crown-like homotrimers (2,4). In humans, both SARS-CoV and SARS-CoV-2 spike proteins utilize the angiotensin-converting enzyme 2 (ACE2) protein as a receptor for cellular entry (5-7). Spike protein subunits represent a key antigenic feature of coronavirus virions, and therefore represent an important target of vaccines, novel therapeutic antibodies, and small-molecule inhibitors (8,9).

  1. Zhou, P. et al. (2020) Nature 579, 270-3.
  2. Tortorici, M.A. and Veesler, D. (2019) Adv Virus Res 105, 93-116.
  3. Li, F. et al. (2006) J Virol 80, 6794-800.
  4. Li, F. (2016) Annu Rev Virol 3, 237-61.
  5. Shang, J. et al. (2020) Nature 581, 221-4.
  6. Wrapp, D. et al. (2020) Science 367, 1260-3.
  7. Yan, R. et al. (2020) Science 367, 1444-8.
  8. Yuan, Y. et al. (2017) Nat Commun 8, 15092.
  9. Amanat, F. and Krammer, F. (2020) Immunity 52, 583-9.

Pathways & Proteins

Explore pathways + proteins related to this product.

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