Reactome | UBA1 conjugates ubiquitin to UBA1 in the cytosol

UBA1 conjugates ubiquitin to UBA1 in the cytosol

Stable Identifier

R-HSA-8852133

Type

Reaction [transition]

Species

Homo sapiens

Compartment

cytosol

ReviewStatus

5/5

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UBA1 conjugates ubiquitin to UBA1 in the cytosol

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Activation of ubiquitin by UBA1 proceeds through 3 steps: adenylation of ubiquitin, conjugation of ubiquitin from adenyl-ubiquitin to an internal cysteine residue of UBA1, and adenylation of a second molecule of ubiquitin. In the second step, the thiol group of an internal cysteine residue of UBA1 attacks the acyl-adenyl bond of the C-terminal glycine of adenylated ubiquitin, resulting in a thioester bond between the cysteine residue and the C-terminal glycine of ubiquitin (Jin et al. 2007, inferred from the rabbit homologue in Haas et al. 1982, Hershko et al. 1983, reviewed in Groettrup et al. 2008).

Literature References

PubMed ID	Title	Journal	Year
17597759	Dual E1 activation systems for ubiquitin differentially regulate E2 enzyme charging Li, X, Gygi, SP, Jin, J, Harper, JW	Nature	2007
18353650	Activating the ubiquitin family: UBA6 challenges the field Hofmann, K, Pelzer, C, Groettrup, M, Schmidtke, G	Trends Biochem. Sci.	2008
6277905	Ubiquitin-activating enzyme. Mechanism and role in protein-ubiquitin conjugation Rose, IA, Hershko, A, Haas, AL, Warms, JV	J. Biol. Chem.	1982
6305978	Components of ubiquitin-protein ligase system. Resolution, affinity purification, and role in protein breakdown Ciechanover, A, Elias, S, Heller, H, Hershko, A	J. Biol. Chem.	1983
17580310	UBE1L2, a novel E1 enzyme specific for ubiquitin Pelzer, C, Singh, RK, Groettrup, M, Scheffner, M, Matentzoglu, K, Schmidtke, G, Kassner, I, Wollscheid, HP	J. Biol. Chem.	2007