3R3M

Crystal structure of the FAF1 UBX domain

Summary for 3R3M

• Entry DOI: 10.2210/pdb3r3m/pdb
• Descriptor: FAS-associated factor 1, PHOSPHATE ION (3 entities in total)
• Functional Keywords: beta grasp fold, apoptosis, p97, phosphorylation
• Biological source: Homo sapiens (human)
• Total number of polymer chains: 4
• Total formula weight: 40074.52

Authors

Haenzelmann, P.,Schindelin, H. (deposition date: 2011-03-16, release date: 2011-06-22, Last modification date: 2023-09-13)

Primary citation

Hanzelmann, P.,Buchberger, A.,Schindelin, H.
Hierarchical Binding of Cofactors to the AAA ATPase p97.
Structure, 19:833-843, 2011

PubMed Abstract: The hexameric AAA ATPase p97 is involved in several human proteinopathies and mediates ubiquitin-dependent protein degradation among other essential cellular processes. Via its N-terminal domain (N domain), p97 interacts with multiple regulatory cofactors including the UFD1/NPL4 heterodimer and members of the "ubiquitin regulatory X" (UBX) domain protein family; however, the principles governing cofactor selectivity remain to be deciphered. Our crystal structure of the FAS-associated factor 1 (FAF1)UBX domain in complex with the p97N domain reveals that the signature Phe-Pro-Arg motif known to be crucial for interactions of UBX domains with p97 adopts a cis-proline configuration, in contrast to a cis-trans mixture we derive for the isolated FAF1UBX domain. Biochemical studies confirm that binding critically depends on a proline at this position. Furthermore, we observe that the UBX proteins FAF1 and UBXD7 only bind to p97-UFD1/NPL4, but not free p97, thus demonstrating for the first time a hierarchy in p97-cofactor interactions.

PubMed: 21645854
DOI: 10.1016/j.str.2011.03.018

Experimental method

X-RAY DIFFRACTION (3 Å)