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Inorganic mercury(II)-binding components in normal human blood serum
Journal of Toxicology and Environmental Health
|September 1, 1979
Summary
Mercury(II) primarily binds to albumin in human blood serum, forming complexes with L-cysteine. This interaction is crucial for mercury transport between blood and tissues.
Area of Science:
- Biochemistry
- Environmental Toxicology
- Analytical Chemistry
Background:
- Mercury(II) (Hg(II)) is a toxic heavy metal.
- Understanding Hg(II) interactions in biological systems like human blood serum is vital for toxicology and health risk assessment.
Purpose of the Study:
- To investigate the binding behavior of Hg(II) with human blood serum components at physiological pH.
- To identify the primary binding sites and interactions of Hg(II) within serum.
Main Methods:
- Studying Hg(II) interaction with serum proteins and low-molecular-weight substances.
- Utilizing ultracentrifugation to separate bound and unbound Hg(II).
- Analyzing changes in albumin structure using circular dichroism spectroscopy.
Main Results:
- Most Hg(II) binds to serum proteins, predominantly albumin (>=90%).
- L-cysteine exhibits the highest affinity for Hg(II) among amino acids.
- Hg(II) mediates the formation of albumin dimers and albumin-Hg(II)-L-cysteine ternary complexes.
Conclusions:
- Albumin is the main Hg(II) carrier in blood serum.
- The albumin-Hg(II)-L-cysteine complex likely facilitates Hg(II) transport to tissues.
- Hg(II) binding to albumin does not significantly alter albumin's structure until high concentrations are reached.