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Lead effects on protamine-DNA binding.

B Quintanilla-Vega1, D Hoover, W Bal

  • 1National Cancer Institute at the National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709, USA. mquintan@mail.cinvestav.mx

American Journal of Industrial Medicine
|August 15, 2000
PubMed
Summary
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Lead exposure can harm male fertility by interacting with human protamine HP2, a zinc-binding protein crucial for sperm DNA packaging. This interaction may disrupt DNA binding, potentially causing chromatin alterations and fertility issues.

Area of Science:

  • Environmental Toxicology
  • Reproductive Biology
  • Biochemistry

Background:

  • Lead exposure is a known risk factor for male infertility, but the underlying molecular mechanisms remain unclear.
  • Protamine proteins (P1 and P2) are essential for compacting and protecting sperm DNA.
  • Human HP2 (hP2) is a zinc-containing protein implicated in male fertility.

Purpose of the Study:

  • To investigate the in vitro interaction between lead (Pb2+) and human HP2 (hP2).
  • To determine the effect of lead on the binding affinity of hP2 to DNA.

Main Methods:

  • UV/VIS spectroscopy was used to assess the binding of Pb2+ and Zn2+ to hP2.
  • Electrophoretic mobility shift assays (EMSA) were employed to evaluate the impact of lead on hP2-DNA binding.

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Main Results:

  • UV/VIS data confirmed that hP2 binds both Pb2+ and Zn2+, with thiol groups primarily involved in Zn2+ binding, while Pb2+ utilizes additional sites.
  • EMSA revealed that lead interaction with hP2 dose-dependently reduced hP2's ability to bind DNA.

Conclusions:

  • In vitro findings indicate that lead can directly interact with hP2, disrupting its binding to sperm DNA.
  • This lead-induced alteration of DNA-protamine interaction may lead to chromatin instability, contributing to male infertility and potential DNA damage.