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Molecular Characterization of Buffalo Haptoglobin: Sequence Based Structural Comparison Indicates Convergent
S K Niranjan1, S Goyal1,2, P K Dubey1,3
1a National Bureau of Animal Genetic Resources , Karnal , India.
Animal Biotechnology
|December 10, 2015
Summary
Buffalo haptoglobin (Hp) shares structural similarities with human Hp2, featuring an alpha-chain duplication and an extra complement control protein (CCP) domain. This suggests convergent evolution and distinct functional adaptations in ruminants.
Area of Science:
- Biochemistry
- Molecular Biology
- Evolutionary Biology
Background:
- Haptoglobin (Hp) binds hemoglobin (Hb) during hemolysis, scavenging free radicals.
- Hp molecule uniqueness is known in humans and cattle, but less studied in other animals.
Purpose of the Study:
- Characterize buffalo Hp molecule: structure, evolution, and tissue expression.
- Investigate structural and functional conservation of buffalo Hp.
- Explore evolutionary relationships and functional variations in Hp across species.
Main Methods:
- Comparative analysis of molecular structure and domain prediction.
- Phylogenetic analysis to determine evolutionary groupings.
- Identification of key amino acid residues for Hp-Hb and Hp-CD163 interactions.
- Tissue expression analysis of Hp.
Main Results:
- Buffalo Hp exhibits an internal duplication in the alpha-chain, similar to human Hp2, encoding an extra CCP domain.
- Phylogenetic analysis groups buffalo and ruminants separately from non-ruminants, including humans.
- Significant variations in key amino acid residues for Hp interactions were observed in buffalo compared to non-ruminants.
- Constitutive Hp expression was confirmed across all vital buffalo tissues.
Conclusions:
- Buffalo Hp is structurally and functionally conserved, with alpha-chain duplication and an extra CCP domain, suggesting convergent evolution.
- Ruminant Hp may have evolved separately, potentially influenced by the extra CCP domain affecting dimerization.
- Buffalo Hp interactions with Hb and CD163 show species-specific variations.
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