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Sequence homology of complement C8 gamma chain with alpha 1-microglobulin and its implications for C8 structure and
1European Molecular Biology Laboratory, Heidelberg, FRG.
Molecular Immunology
|June 1, 1988
Summary
Complement C8 gamma, a subunit of C8, shows strong resemblance to alpha 1-microglobulin and protein HC, suggesting a shared genetic origin. This finding implies a role for C8 gamma in regulating inflammatory responses through disulfide bonding with C8 alpha.
Area of Science:
- Biochemistry
- Immunology
- Molecular Biology
Background:
- The complement system component C8 gamma (C8γ) is a disulfide-bonded subunit of C8 with an undefined function and homology.
- The structural and functional characteristics of C8γ remain largely unknown within the complement cascade.
Purpose of the Study:
- To elucidate the functional and evolutionary origins of complement C8 gamma.
- To investigate the potential role of C8 gamma in the complement system and inflammatory processes.
Main Methods:
- Sequence and structural homology analysis comparing C8 gamma with known proteins.
- Extrapolation of functional roles based on similarities to alpha 1-microglobulin family members.
Main Results:
- Complement C8 gamma exhibits significant sequence and length similarity to alpha 1-microglobulin and protein HC, indicating a common genetic origin.
- A specific region in C8 alpha shows structural homology to the cysteine-containing region of C8 gamma, suggesting a site for disulfide bonding.
Conclusions:
- Complement C8 gamma likely shares a common evolutionary path with alpha 1-microglobulin and protein HC.
- The cysteine residue in C8 gamma is proposed to be involved in disulfide bonding with C8 alpha, potentially regulating inflammatory responses.