204886

Complement C4, Human

Complement C4, Human, CAS 80295-48-3,is a native glycoprotein composed of three non-identical subunits of 93, 75, and 32 kDa linked by disulfide bonds.

• Synonym(s): Complement C4, Human
• CAS Number: 80295-48-3
• MDL number: MFCD00130838
• UNSPSC Code: 12352202
• NACRES: NA.25

Properties

• Quality Level: 100
• Assay: ≥90% (SDS-PAGE)
• form: liquid
• specific activity: >3X10⁵ C4H50 units/mg protein
• manufacturer/tradename: Calbiochem^®
• storage condition: OK to freeze; avoid repeated freeze/thaw cycles
• shipped in: dry ice
• storage temp.: −70°C

Description

General description

Native, human C4 complement component. Glycoprotein composed of three non-identical subunits of M.W. 93,000 (α), 75,000 (β), and 32,000 (γ) linked by disulfide bonds. Present in normal human serum at 400 µg/ml. On activation of complement via the classical pathway, the C1s subcomponent of the C1 complex is converted to an active serine protease that cleaves the C4 α-chain at peptide bond 77, resulting in the production of C4a (M.W. 8740) and C4b fragments (M.W. 193,000). The released C4a peptide is one of the three complement-derived anaphylatoxins. The nascent C4b fragment can form a covalent ester bond with target surfaces. This covalent attachment of C4b to target acceptors is required for continuation of activation via classical pathway.

Biochem/physiol Actions

≥60% of the C4 activity present in freshly drawn normal human serum on a mg to mg basis

Packaging

Please refer to vial label for lot-specific concentration.

Warning

Toxicity: Standard Handling (A)

Other Notes

Janatova, J. 1983. Ann. N.Y. Acad. Sci. 421, 218.
Hammer, C.H., et al. 1981. J. Biol. Chem. 256, 3995.

Legal Information

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany

Safety Information

• Storage Class Code: 12 - Non Combustible Liquids
• WGK: WGK 2
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable