Complement Factor I antibody | 3R/8

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Mouse anti Human Complement Factor I

Product Type
Monoclonal Antibody
Product CodeApplicationsDatasheetMSDSPack SizeList PriceQuantity
MCA2615 C E F FN WB 0.1 mg
Mouse anti Human Complement Factor I antibody, clone 3R/8 recognizes complement factor I, a member of the peptidase S1 family present in the blood plasma. Factor I is an 88 kDa protein consisting of one polypeptide chain of 35.4 kDa and one of 27.6 kDa. Factor I is a serine protease which inactivates complement components C3b and C4b. C3b cleavage requires the presence of cofactors complement component (3b/4b) receptor 1 (CR1), membrane cofactor protein or factor H, while C4b cleavage requires complement component 4 binding protein or CR1. Factor I has no natural inhibitors.

Dysfunctional factor I can lead to uncontrolled activation of the alternative complement pathway causing in systemic depletion of C3 and lower levels of factors B and H, resulting in recurrent pyogenic infections. Defects in CFI are also associated with haemolytic uraemic syndrome.

Mouse anti Human Complement Factor I antibody, clone 3R/8 blocks function of complement factor I.

Removal of Sodium Azide is recommended prior to use in functional assays. The use of EQU003 is recommended for this purpose.

Product Details

Target Species
Product Form
Purified IgG - liquid
Purified IgG prepared by affinity chromatography on Protein A
Buffer Solution
Borate buffered saline
Preservative Stabilisers
0.1%Sodium Azide (NaN3)
Native human factor I from serum.
Approx. Protein Concentrations
IgG concentration 1.0mg/ml

Storage Information

Store at +4oC or at -20oC if preferred.
Storage in frost-free freezers is not recommended.
This product should be stored undiluted. Avoid repeated freezing and thawing as this may denature the antibody. Should this product contain a precipitate we recommend microcentrifugation before use.
Guaranteed until date of expiry. Please see product label.

More Information

P05156 Related reagents
Entrez Gene
CFI Related reagents
GO Terms
GO:0016020 membrane
GO:0004252 serine-type endopeptidase activity
GO:0005044 scavenger receptor activity
GO:0005615 extracellular space
GO:0006508 proteolysis
GO:0006958 complement activation, classical pathway
GO:0045087 innate immune response
For research purposes only

Applications of Complement Factor I antibody

This product has been reported to work in the following applications. This information is derived from testing within our laboratories, peer-reviewed publications or personal communications from the originators. Please refer to references indicated for further information. For general protocol recommendations, please visit the antibody protocols page.
Application Name Verified Min Dilution Max Dilution
ELISA 1/500 1/4000
Flow Cytometry
Functional Assays
Immunohistology - Frozen
Western Blotting
Where this product has not been tested for use in a particular technique this does not necessarily exclude its use in such procedures. Suggested working dilutions are given as a guide only. It is recommended that the user titrates the product for use in their own system using appropriate negative/positive controls.
Histology Positive Control Tissue
Kidney from post streptoccal glomerulonephritis patients

Negative Isotype Controls Available

Description Product Code Pack Size Applications List Price Quantity
Mouse IgG1 Negative Control MCA928 100 Tests F

Product Specific References

References for Complement Factor I antibody

  1. Dragon-Durey, M.A. & Frémeaux-Bacchi, V. (2005) Atypical haemolytic uraemic syndrome and mutations in complement regulator genes.
    Springer Semin Immunopathol. 27 (3): 359-74.
  2. Nilsson, S.C. et al. (2007) A mutation in factor I that is associated with atypical hemolytic uremic syndrome does not affect the function of factor I in complement regulation.
    Mol Immunol. 44 (8): 1835-44.
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