CATH Domain 4bbnA03

CATH Classification

Level	CATH Code	Description
	3	Alpha Beta
	3.30	2-Layer Sandwich
	3.30.2410	Hect, E3 ligase catalytic fold
	3.30.2410.10	Hect, E3 ligase catalytic domain

Domain Context

CATH Clusters

Superfamily	Hect, E3 ligase catalytic domain
Functional Family	E3 ubiquitin-protein ligase NEDD4-like

Enzyme Information

2.3.2.26

HECT-type E3 ubiquitin transferase.

based on mapping to UniProt P46934

S-ubiquitinyl-[E2 ubiquitin-conjugating enzyme]-L-cysteine + [acceptor protein]-L-lysine = [E2 ubiquitin-conjugating enzyme]-L-cysteine + N(6)- ubiquitinyl-[acceptor protein]-L-lysine.

-!- In the first step the enzyme transfers ubiquitin from the E2 ubiquitin-conjugating enzyme (EC 2.3.2.23) to a cysteine residue in its HECT domain (which is located in the C-terminal region), forming a thioester bond. -!- In a subsequent step the enzyme transfers the ubiquitin to an acceptor protein, resulting in the formation of an isopeptide bond between the C-terminal glycine residue of ubiquitin and the epsilon- amino group of an L-lysine residue of the acceptor protein. -!- Cf. EC 2.3.2.27 and EC 2.3.2.31.

UniProtKB Entries (2)

P0CG53	UBB_BOVIN Bos taurus Polyubiquitin-B
P46934	NEDD4_HUMAN Homo sapiens E3 ubiquitin-protein ligase NEDD4

PDB Structure

PDB	4BBN
External Links	PDBSum Proteopedia
Method	X-RAY DIFFRACTION
Organism
Primary Citation	Structure of a Ubiquitin-Loaded Hect Ligase Reveals the Molecular Basis for Catalytic Priming Maspero, E., Valentini, E., Mari, S., Cecatiello, V., Soffientini, P., Pasqualato, S., Polo, S. Nat.Struct.Mol.Biol.