ALAD	δ-aminolevulinic acid dehydratase
ALP	autophagy-lysosome pathway
Arg, R	arginine
CCR	catalytic core regulators
CP	core particle
cryo-EM	cryo-electron microscopy
DUB	deubiquitinase
ER	endoplasmic reticulum
ERAD	ER-associated degradation
FAD	flavin adenine dinucleotide
iCP	immunoproteasome
Leu, L	leucine
LLPS	liquid-liquid phase separation
Lys, K	lysine
NLS	nuclear localization signal
NPC	nuclear pore complex
NQO1	NAD(P)H dehydrogenase [quinone] 1
ODC	ornithine decarboxylase
PB1	Phox and Bem1
Phe, F	phenylalanine
PI31	proteasome inhibitor subunit 1
PIR	proteasome-interaction region
polyQ	polyglutamine
PML	promyelocytic leukaemia
PQC	protein quality control
PSGs	Proteasome Storage Granules
RP	regulatory particle
tCP	thymoproteasome
Trp, W	tryptophan
Tyr, Y	tyrosine
Ub	ubiquitin
UBA	ubiquitin-associated
UBL	ubiquitin-like
UBR	ubiquitin- binding receptor
UCH-L5	Ub carboxyl-terminal hydrolase isozyme L5
UPS	ubiquitin–proteasome system
USP14	Ub-specific peptidase 14
USP15	Ub-specific peptidase 15
USP7	Ub-specific peptidase 7