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. 2014 Sep 2;289(42):29310–29321. doi: 10.1074/jbc.M114.595207

FIGURE 9.

FIGURE 9.

Model of UPR induction by amplified rounds of transducin activation. Defective rhodopsin shutoff in the ARR1−/− and GRK1−/− leads to excessive GTP utilization by transducin and GC/PDE. This in turn leads to metabolic stress, followed by proteasomal stress. When UPR fails to re-establish homeostasis, cell death ensues.