Ubiquitin
PDB ID: 1UBQA chain of ubiquitin molecules are added to obsolete proteins, indicating that they need to be destroyed. This structure includes a single ubiquitin molecule.
Read the Molecule of the Month article on Ubiquitin.
Discussed Structures from Ubiquitin
ubiquitin
tetraubiquitin
ubiquitin-activating enzyme E1
ubiquitin-conjugating enzyme E2
ubiquitin-ligase E3
ubiquitin-ligase E3
proteasome
Reference
PDB ID: 1UBQ
, Pubmed
Vijay-Kumar, S., Bugg, C.E., Cook, W.J. (1987) Structure of ubiquitin refined at 1.8 A resolution. J Mol Biol 194: 531-44

