(A-D) Inhibition of the proteasome by overexpression of a temperature sensitive proteasome mutant (DTS). Dmef2-Gal4, UAS-GFP-Atg8a control and UAS-DTS; Dmef2-Gal4, UAS-GFP-Atg8a and animals were shifted to the restrictive temperature then starved and CQ treated 6 hrs prior to dissection. 18 hrs post-shift (PS), both control (A) and DTS muscles (B) accumulate GFP-Atg8a punctae, but the latter also accumulate ubiquitin (Ubi) aggregates. 48 hrs PS, control muscles (C) maintain strong autophagy induction, but DTS mutant muscles (D) have reduced GFP-Atg8a punctae accumulation, similar to the Rpn1 knockdown phenotype. (E) Quantification of the mean GFP-Atg8a punctae and Mander's overlap coefficient for GFP-Atg8a and Ubi for genotypes shown in A-D (SEM is indicated for n = 8 ventral longitudinal muscles from individual animals with p-values of DTS relative to control). Dark green = Dmef2-Gal4, UAS-GFP-Atg8a; Light green = UAS-DTS; Dmef2-Gal4, UAS-GFP-Atg8a. 