CATH Classification

Domain Context

CATH Clusters

Superfamily Glutamine Phosphoribosylpyrophosphate, subunit 1, domain 1
Functional Family Proteasome subunit alpha type-3

Enzyme Information

3.4.25.1
Proteasome endopeptidase complex.
based on mapping to UniProt P23638
Cleavage of peptide bonds with very broad specificity.
-!- A 20-S protein composed of 28 subunits arranged in four rings of seven. -!- The outer rings are composed of alpha subunits, but the beta subunits forming the inner rings are responsible for peptidase activity. -!- In eukaryotic organisms there are up to seven different types of beta subunits, three of which may carry the N-terminal threonine residues that are the nucleophiles in catalysis, and show different specificities. -!- The molecule is barrel-shaped, and the active sites are on the inner surfaces. -!- Terminal apertures restrict access of substrates to the active sites. -!- Inhibited by mercurial reagents and some inhibitors of serine endopeptidases. -!- Belongs to peptidase family T1. -!- Formerly EC 3.4.22.21, EC 3.4.24.5 and EC 3.4.99.46.

UniProtKB Entries (1)

P30657
PSB7_YEAST
Saccharomyces cerevisiae S288C
Proteasome subunit beta type-7

PDB Structure

PDB 4NO9
External Links
Method X-RAY DIFFRACTION
Organism
Primary Citation
Systematic Comparison of Peptidic Proteasome Inhibitors Highlights the alpha-Ketoamide Electrophile as an Auspicious Reversible Lead Motif.
Stein, M.L., Cui, H., Beck, P., Dubiella, C., Voss, C., Kruger, A., Schmidt, B., Groll, M.
Angew.Chem.Int.Ed.Engl.