期刊
JOURNAL OF BIOLOGICAL CHEMISTRY
卷 288, 期 11, 页码 7781-7790出版社
AMER SOC BIOCHEMISTRY MOLECULAR BIOLOGY INC
DOI: 10.1074/jbc.M112.441907
关键词
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资金
- National Institutes of Health/NIGMS [R01 GM051923-17]
- Amyotropic Lateral Sclerosis Association [K2Y740]
- Fidelity Biosciences Research Initiative
Degradation of ubiquitinated proteins by 26 S proteasomes requires ATP hydrolysis, but it is unclear how the proteasomal ATPases are regulated and how proteolysis, substrate deubiquitination, degradation, and ATP hydrolysis are coordinated. Polyubiquitinated proteins were shown to stimulate ATP hydrolysis by purified proteasomes, but only if the proteins contain a loosely folded domain. If they were not ubiquitinated, such proteins did not increase ATPase activity. However, they did so upon addition of ubiquitin aldehyde, which mimics the ubiquitin chain and binds to 26 S-associated deubiquitinating enzymes (DUBs): in yeast to Ubp6, which is essential for the ATPase activation, and in mammalian 26 S to the Ubp6 homolog, Usp14, and Uch37. Occupancy of either DUB by a ubiquitin conjugate leads to ATPase stimulation, thereby coupling deubiquitination and ATP hydrolysis. Thus, ubiquitinated loosely folded proteins, after becoming bound to the 26 S, interact with Ubp6/Usp14 or Uch37 to activate ATP hydrolysis and enhance their own destruction.
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