Abstract
Vesicular stomatitis virus grown in the presence of omega-[9-3H]diazirinophenoxy nonanoate resulted in the biosynthetic incorporation of this photoreactive fatty acid into viral phospholipids as well as into the membrane anchoring domain of the viral G glycoprotein. Photolysis of the isolated virus at 360 nm resulted in extensive labeling of the G protein but none of the other proteins by the viral phospholipids. In addition, a new product was obtained and was identified as a G-G dimer by its molecular weight and its reaction with anti-G antibody. These results demonstrate the use of photoreactive fatty acid to identify integral membrane proteins and to make photoaffinity probes of fatty acylated membrane proteins.
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