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December 1997; 52 (6)
[Index by Author]
[Cover Caption]
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About the cover: Rapid agonist-induced
sequestration of a GFP-tagged
2-adrenergic receptor. A fusion
protein was constructed that consisted of the S65T mutant of green
fluorescent protein (GFP) attached to the carboxyl terminus of the
2-adrenergic receptor. The GFP tag did not interfere with ligand
recognition, G protein coupling or internalization. Left,
when expressed in HEK 293 cells, receptor is distributed diffusely over
the surface membrane. Right, 5 min after exposure to 10 µM isoproterenol, receptors are internalized within
endosomal vesicular membranes. The left and right
panels are two different cells representative of control and
agonist-treated populations. From Barak, L. S., S. S. G. Ferguson, J. Zhang, C. Martenson, T. Meyer, and M. C. Caron. Internal trafficking
and surface mobility of a functionally intact
2-adrenergic
receptor-green fluorescent protein conjugate. Mol.
Pharmacol. 51:177-184 (1997).