Human Complement Component C1s Antibody

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Product Details
Citations (3)
Supplemental Products
Reviews (1)

Human Complement Component C1s Antibody Summary

Species Reactivity
Detects human Complement Component C1s in direct ELISAs and Western blots. In direct ELISAs and Western blots, less than
2% cross‑reactivity with recombinant human C1r is observed.
Polyclonal Sheep IgG
Antigen Affinity-purified
Mouse myeloma cell line NS0-derived recombinant human Complement Component C1s
Accession # P09871
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.


Recommended Concentration
Western Blot
0.1 µg/mL
Recombinant Human Complement Component C1s (Catalog # 2060-SE)

Please Note: Optimal dilutions should be determined by each laboratory for each application. General Protocols are available in the Technical Information section on our website.

Reconstitution Calculator

Reconstitution Calculator

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Preparation and Storage

Reconstitute at 0.2 mg/mL in sterile PBS.
Reconstitution Buffer Available
Reconstitution Buffer 1 (PBS)
Catalog #
Size / Price
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below. *Small pack size (SP) is shipped with polar packs. Upon receipt, store it immediately at -20 to -70 °C
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: Complement Component C1s

The classical complement pathway plays a major role in innate immunity against infection. This pathway is triggered by C1, a multimolecular complex composed of the recognition protein C1q and two serine proteases, C1r and C1s. Following the C1q recognition, C1r is autoactivated, and in turn activates C1s, which cleaves C4 and C2, the C1 substrates (1). Both C1r and C1s activation involve cleavage of a specific Arg-Ile bond, converting single-chain proenzymes into active proteases of disulfide bond-linked chains (A and B) (2). The A chains contain multiple domains in the order of CUB1-EGF-CUB2-CCP1-CCP2-Activation Peptide. The B chains contain the serine protease catalytic domain. The full-length (amino acid residues 1‑688) of human C1s was expressed (3‑5). The purified protein corresponded to the processed active form, with A and B chains starting at residue Glu16 and Ile438, respectively.

  1. Arlaud, G.J. et al. (2002) Biochem. Soc. Trans. 30:1001.
  2. Lacroix, M. et al. (2001) J. Biol. Chem. 276:36233.
  3. Tosi, M. et al. (1987) Biochemistry 26:8516.
  4. Mackinnon, C.M. et al. (1987) Eur. J. Biochem. 169:547.
  5. Kusumoto, H. et al. (1988) Proc. Natl. Acad. Sci. USA 85:7307.
Entrez Gene IDs
716 (Human)
Alternate Names
basic proline-rich peptide IB-1; C1 esterase; C1S; complement C1s subcomponent; Complement component 1 subcomponent s; complement component 1, s subcomponent; Complement Component C1s; EC 3.4.21; EC; FLJ44757

Product Datasheets

Citations for Human Complement Component C1s Antibody

R&D Systems personnel manually curate a database that contains references using R&D Systems products. The data collected includes not only links to publications in PubMed, but also provides information about sample types, species, and experimental conditions.

3 Citations: Showing 1 - 3
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  1. EDTA/gelatin zymography method to identify C1s versus activated MMP-9 in plasma and immune complexes of patients with systemic lupus erythematosus
    Authors: E Ugarte-Ber, E Martens, L Boon, J Vandooren, D Blockmans, P Proost, G Opdenakker
    J. Cell. Mol. Med., 2019;23(1):576-585.
    Species: Human
    Sample Types: Plasma
    Applications: Zymography
  2. Effect of the Anti-C1s Humanized Antibody TNT009 and its Parental Mouse Variant TNT003 on HLA Antibody-induced Complement Activation - A Preclinical in Vitro Study
    Authors: M Wahrmann, J Mühlbacher, L Marinova, H Regele, N Huttary, F Eskandary, G Cohen, GF Fischer, GC Parry, JC Gilbert, S Panicker, GA Böhmig
    Am. J. Transplant, 2017;0(0):.
    Applications: Flow Cytometry
  3. Activation of the classical complement pathway by Bacillus anthracis is the primary mechanism for spore phagocytosis and involves the spore surface protein BclA.
    Authors: Gu C, Jenkins SA, Xue Q, Xu Y
    J. Immunol., 2012;188(9):4421-31.
    Species: Human
    Sample Types: Protein


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Human Complement Component C1s Antibody
By Anonymous on 12/08/2018
Application: Immunohistochemistry Sample Tested: HUVEC human umbilical vein endothelial cells Species: Human