A 27-year-old man with type 1 diabetes mellitus is brought to the emergency department after being found confused and diaphoretic. Fingerstick glucose is 38 mg/dL. He is unable to tolerate oral intake, so he is treated with intramuscular glucagon. Within minutes, his mental status improves. In addition to increasing hepatic glycogenolysis, glucagon raises blood glucose primarily by which of the following intracellular changes in hepatocytes?

(Assume he is otherwise healthy and not taking other medications.)