 Ubiquitins and Ubiquitin-like proteins
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Ubiquitin-activating enzymes (E1)
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Ubiquitin-conjugating enzymes (E2)
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Ubiquitin ligases (E3)
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Deubiquitinating enzyme (DUB)
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 Proteasome
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Core particles (20S proteasome)
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PA700 (19S proteasome)
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 PA28 (11S REG)
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PA200
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PI31
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Prokaryotic proteasome
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Assembling factors
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Assembling chaperones
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Other assembling factors
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Lferr_2755 heat shock protein HSP90; K04079 molecular chaperone HtpG
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Proteasome interacting proteins (PIPs)
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ESCRTs
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Ubiquitin System - Acidithiobacillus ferrooxidans ATCC 53993