CATH Classification
| Level | CATH Code | Description |
|---|---|---|
|
1 | Mainly Alpha |
|
1.20 | Up-down Bundle |
|
1.20.1300 | 3 helical TM bundles of succinate and fumarate reductases |
|
1.20.1300.20 | Peptidase C65 Otubain, subdomain 2 |
Domain Context
CATH Clusters
| Superfamily | Peptidase C65 Otubain, subdomain 2 |
| Functional Family | Ubiquitin thioesterase OTUB1 |
Enzyme Information
| 2.3.2.24 |
(E3-independent) E2 ubiquitin-conjugating enzyme.
based on mapping to UniProt P62837
S-ubiquitinyl-[E1 ubiquitin-activating enzyme]-L-cysteine + [acceptor protein]-L-lysine = [E1 ubiquitin-activating enzyme]-L-cysteine + N(6)- monoubiquitinyl-[acceptor protein]-L-lysine.
-!- The enzyme transfers a single ubiquitin directly from an ubiquitinated E1 ubiquitin-activating enzyme to itself, and on to a lysine residue of the acceptor protein without involvement of E3 ubiquitin transferases (cf. EC 2.3.2.26, EC 2.3.2.27). -!- It forms a labile ubiquitin adduct in the presence of E1, ubiquitin, and Mg(2+)-ATP and catalyzes the conjugation of ubiquitin to protein substrates, independently of E3. -!- This transfer has only been observed with small proteins. -!- In vitro a transfer to small acceptors (e.g. L-lysine, N-acetyl-L- lysine methyl ester) has been observed.
|
| 2.3.2.23 |
E2 ubiquitin-conjugating enzyme.
based on mapping to UniProt P62837
S-ubiquitinyl-[E1 ubiquitin-activating enzyme]-L-cysteine + [E2 ubiquitin-conjugating enzyme]-L-cysteine = [E1 ubiquitin-activating enzyme]-L-cysteine + S-ubiquitinyl-[E2 ubiquitin-conjugating enzyme]-L- cysteine.
-!- The E2 ubiquitin-conjugating enzyme acquires the activated ubquitin from the E1 ubiquitin-activating enzyme (EC 6.2.1.45) and binds it via a transthioesterification reaction to itself. -!- In the human enzyme the catalytic center is located at Cys-87 where ubiquitin is bound via its C-terminal glycine in a thioester linkage. -!- Formerly EC 6.3.2.19.
|
| 3.4.19.12 |
Ubiquitinyl hydrolase 1.
based on mapping to UniProt Q96FW1
Thiol-dependent hydrolysis of ester, thioester, amide, peptide and isopeptide bonds formed by the C-terminal Gly of ubiquitin (a 76-residue protein attached to proteins as an intracellular targeting signal).
-!- Links to polypeptides smaller than 60 residues are hydrolyzed more readily than those to larger polypeptides. -!- Isoforms exist with quantitatively different specificities among the best known being UCH-L1 and UCH-L3, major proteins of the brain of mammals. -!- Inhibited by ubiquitin aldehyde (in which Gly76 is replaced by aminoacetaldehyde). -!- Belongs to peptidase family C12.
|
UniProtKB Entries (1)
| Q96FW1 |
OTUB1_HUMAN
Homo sapiens
Ubiquitin thioesterase OTUB1
|
PDB Structure
| PDB | 4DDI |
| External Links | |
| Method | X-RAY DIFFRACTION |
| Organism | |
| Primary Citation |
OTUB1 Co-opts Lys48-Linked Ubiquitin Recognition to Suppress E2 Enzyme Function.
Mol.Cell
|