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AB316611

Recombinant Human Complement Factor I Protein Standard (His tag)

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Recombinant Human Complement Factor I Protein Standard (His tag) is a Human Fragment protein, expressed in HEK 293 cells, with >80%, suitable for SDS-PAGE, sELISA.

View Alternative Names

IF, CFI, Complement factor I, C3B/C4B inactivator

2 Images
Sandwich ELISA - Recombinant Human Complement Factor I Protein Standard (His tag) (AB316611)
  • sELISA

Supplier Data

Sandwich ELISA - Recombinant Human Complement Factor I Protein Standard (His tag) (AB316611)

Sandwich ELISA with the capture antibody dilution at 2 μg/mL and detector antibody dilution at 0.5 μg/mL.

SDS-PAGE - Recombinant Human Complement Factor I Protein Standard (His tag) (AB316611)
  • SDS-PAGE

Supplier Data

SDS-PAGE - Recombinant Human Complement Factor I Protein Standard (His tag) (AB316611)

SDS-PAGE analysis of ab316611 under reducing conditions for 2ug protein

Key facts

Purity

>80% SDS-PAGE

Expression system

HEK 293 cells

Tags

His tag C-Terminus

Applications

SDS-PAGE, sELISA

applications

Biologically active

No

Accession

P05156

Animal free

Yes

Carrier free

No

Species

Human

Storage buffer

pH: 7.3 - 7.5 Constituents: 2.922% Sodium chloride, 0.64107% disodium;hydrogen phosphate;dodecahydrate, 0.02858% Potassium phosphate monobasic

storage-buffer

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Complementary Products

Primary Antibodies

AB278524

Anti-Factor I/CFI antibody [EPR23948-48]

RabMAb|Recombinant

Western blot - Anti-Factor I/CFI antibody [EPR23948-48] (AB278524)

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Assay Kits

AB284615

Human Complement Factor I ELISA Kit

Recombinant|SimpleStep

ELISA - Human Complement Factor I ELISA Kit (AB284615)

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Proteins & Peptides

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Proteins & Peptides

AB271721

Recombinant human PRMT5 + MEP50 protein (Active)

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Reactivity data

{ "title": "Reactivity Data", "filters": { "stats": ["", "Reactivity", "Dilution Info", "Notes"] }, "values": { "SDS-PAGE": { "reactivity":"TESTED_AND_REACTS", "dilution-info":"", "notes":"<p></p>" }, "sELISA": { "reactivity":"TESTED_AND_REACTS", "dilution-info":"", "notes":"<p></p>" } } }
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Product details

While the standard is the same as the one provided in the corresponding SimpleStep ELISA Kit, it cannot be treated as the consumable provided with our SimpleStep ELISA Kit due to differences in its concentration calibration.

Abcam guarantee that this protein standard is suitable for use in a sandwich ELISA. Individual results may vary due to differences in technique, laboratory equipment, buffers, and other experimental factors. The detection range provided for this protein standard is based on initial sandwich ELISA validation data.

The protein concentration is the concentration after validation on our sandwich ELISA platform. This Standard protein is guaranteed to work with our Capture and Detector antibodies in sELISA. Please contact our Scientific Support team to know which antibody pair is suitable for this protein.

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Sequence info

[{"sequence":null,"proteinLength":"Fragment","predictedMolecularWeight":"37.4 kDa","actualMolecularWeight":null,"aminoAcidEnd":0,"aminoAcidStart":0,"nature":"Recombinant","expressionSystem":"HEK 293 cells","accessionNumber":"P05156","tags":[{"tag":"His","terminus":"C-Terminus"}]}]
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Properties and storage information

Shipped at conditions
Dry Ice
Appropriate short-term storage conditions
-80°C
Appropriate long-term storage conditions
-80°C
Aliquoting information
Upon delivery aliquot
Storage information
Avoid freeze / thaw cycle
False
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Supplementary information

This supplementary information is collated from multiple sources and compiled automatically.

Factor I also known as Complement Factor I (CFI) is a serine protease involved in the complement system. Its molecular mass is approximately 88 kDa consisting of a heavy and a light chain linked by a disulfide bond. This protein is mainly expressed in the liver and circulates in the plasma. Factor I inhibits the complement pathways by cleaving complement components C3b and C4b preventing the formation of C3 and C5 convertases.
Biological function summary

Factor I plays a role in maintaining immune homeostasis by preventing excessive complement activation. It acts within a complex that includes cofactors such as Factor H Complement Factor 4 binding protein (C4BP) and Membrane Cofactor Protein (MCP). These interactions allow Factor I to selectively degrade activated complement components ensuring that complement activity is kept in check to avoid host cell damage.

Pathways

Factor I operates in both the classical and alternative complement pathways. In the classical pathway it regulates C3b and C4b breakdown to control the formation of the C3 convertase. In the alternative pathway Factor I works in conjunction with Factor H to degrade C3b. This regulation is important to prevent runaway activation protecting healthy tissue from complement-mediated damage.

Factor I deficiencies can lead to conditions like atypical hemolytic uremic syndrome (aHUS) and age-related macular degeneration (AMD). In aHUS insufficient Factor I activity permits unregulated complement activation leading to thrombotic microangiopathy. In AMD aberrant complement activation contributes to retinal damage and degeneration. These conditions illustrate the need for balanced Factor I activity to prevent disease.
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Specifications

Form

Liquid

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General info

Function

Trypsin-like serine protease that plays an essential role in regulating the immune response by controlling all complement pathways. Inhibits these pathways by cleaving three peptide bonds in the alpha-chain of C3b and two bonds in the alpha-chain of C4b thereby inactivating these proteins (PubMed : 17320177, PubMed : 7360115). Essential cofactors for these reactions include factor H and C4BP in the fluid phase and membrane cofactor protein/CD46 and CR1 on cell surfaces (PubMed : 12055245, PubMed : 2141838, PubMed : 9605165). The presence of these cofactors on healthy cells allows degradation of deposited C3b by CFI in order to prevent undesired complement activation, while in apoptotic cells or microbes, the absence of such cofactors leads to C3b-mediated complement activation and subsequent opsonization (PubMed : 28671664).

Sequence similarities

Belongs to the peptidase S1 family.

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Product protocols

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Target data

Trypsin-like serine protease that plays an essential role in regulating the immune response by controlling all complement pathways. Inhibits these pathways by cleaving three peptide bonds in the alpha-chain of C3b and two bonds in the alpha-chain of C4b thereby inactivating these proteins (PubMed : 17320177, PubMed : 7360115). Essential cofactors for these reactions include factor H and C4BP in the fluid phase and membrane cofactor protein/CD46 and CR1 on cell surfaces (PubMed : 12055245, PubMed : 2141838, PubMed : 9605165). The presence of these cofactors on healthy cells allows degradation of deposited C3b by CFI in order to prevent undesired complement activation, while in apoptotic cells or microbes, the absence of such cofactors leads to C3b-mediated complement activation and subsequent opsonization (PubMed : 28671664).
See full target information CFI
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Product promise

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