PDBsum entry 2n7e

Unknown function

PDB id: 2n7e

Contents

Protein chain

86 a.a.

References listed in PDB file

Key reference

• Title: Structural studies of the yeast DNA damage-Inducible protein ddi1 reveal domain architecture of this eukaryotic protein family.
• Authors: J.F.Trempe, K.G.ŠAšková, M.Sivá, C.D.Ratcliffe, V.Veverka, A.Hoegl, M.Ménade, X.Feng, S.Shenker, M.Svoboda, M.Kožíšek, J.Konvalinka, K.Gehring.
• Ref.: Sci Rep, 2016, 6, 33671. [DOI no: 10.1038/srep33671]
• PubMed id: 27646017

Note: In the PDB file this reference is annotated as "TO BE PUBLISHED". The citation details given above have been manually determined.

Abstract

The eukaryotic Ddi1 family is defined by a conserved retroviral aspartyl protease-like (RVP) domain found in association with a ubiquitin-like (UBL) domain. Ddi1 from Saccharomyces cerevisiae additionally contains a ubiquitin-associated (UBA) domain. The substrate specificity and role of the protease domain in the biological functions of the Ddi family remain unclear. Yeast Ddi1 has been implicated in the regulation of cell cycle progression, DNA-damage repair, and exocytosis. Here, we investigated the multi-domain structure of yeast Ddi1 using X-ray crystallography, nuclear magnetic resonance, and small-angle X-ray scattering. The crystal structure of the RVP domain sheds light on a putative substrate recognition site involving a conserved loop. Isothermal titration calorimetry confirms that both UBL and UBA domains bind ubiquitin, and that Ddi1 binds K48-linked diubiquitin with enhanced affinity. The solution NMR structure of a helical domain that precedes the protease displays tertiary structure similarity to DNA-binding domains from transcription regulators. Our structural studies suggest that the helical domain could serve as a landing platform for substrates in conjunction with attached ubiquitin chains binding to the UBL and UBA domains.