Specific basic proline-rich proteins in human parotid saliva possess significant anti-HIV-I activity independent of that attributable to SLPI or TSP-I. Since the inhibition is detectable with the MAGI assay, its mechanism of action involves virus-host cell interaction prior to the introduction of the tat gene product into the host cell and may be through the binding of the basic proline-rich proteins to the HIV-I gp120 coat of the virus.
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