Reduction of surface receptor and increased intracellular retention with elevated temperature in mutant γ2(K289M) subunit-containing α1β2γ2 receptors was.

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Reduction of surface receptor and increased intracellular retention with elevated temperature in mutant γ2(K289M) subunit-containing α1β2γ2 receptors was rapid and dynamic in heterologous cells. Reduction of surface receptor and increased intracellular retention with elevated temperature in mutant γ2(K289M) subunit-containing α1β2γ2 receptors was rapid and dynamic in heterologous cells. The representative images illustrate the rapid time course of the reduction of heterozygous α1β2γ2S-ECFP/γ2S(K289M)-EYFP surface receptors in COS-7 cells. Cells were cotransfected with heterozygous α1β2γ2S/γ2S(K289M) receptors with the wild-type γ2S tagged with ECFP and the mutant γ2S subunit tagged with EYFP. The receptors displayed a merged aqua color both on the surface and intracellularly after incubation at 40°C for 5 min (boxed area). With incubation at 40°C over a rapid time course, the fluorescence intensity of the surface receptors progressively diminished (7 and 11 min, bottom panel, red boxes) with loss of cyan color on the cell surface (changes of cyan color in the red box, red arrow), and the intracellular fluorescence intensity progressively increased with the accumulation of intracellular receptors (changes of cyan color of the coregistered image in the red box; red double arrow). wt, ECFP-tagged wild-type subunits; mut, EYFP-tagged mutant subunits; co, colocalization of all ECFP and EYFP channels. Jing-Qiong Kang et al. J. Neurosci. 2006;26:2590-2597 ©2006 by Society for Neuroscience