The C-terminus of ubiquitin plays a critical role in deamidase Lpg2148 recognition.
Biochem Biophys Res Commun
; 503(4): 2943-2948, 2018 09 18.
Article
in En
| MEDLINE
| ID: mdl-30107915
ABSTRACT
By bearing a papain-like core structure and a cysteine-based catalytic triad, deamidase can convert glutamine to glutamic acid or asparagine to aspartic acid to modify the functions of host target proteins resulting in the blocking of eukaryotic host cell function. Legionella pneumophila effector Lpg2148 (MvcA) is a deamidase, a structural homolog of cycle inhibiting factor (Cif) effectors. Lpg2148 and Cif effectors are functionally diverse, with Lpg2148 only catalyzing ubiquitin but not NEDD8. However, a detailed understanding of substrate specificity is still missing. Here, we resolved the crystal structure of Lpg2148â¯at 2.5â¯Å resolution and obtained rigid-body modeling of Lpg2148 with C-terminus deleted ubiquitin (1-68) (ubΔc) complex using HADDOCK, which shows that the C-terminus of ubiquitin is flexible in recognition. We also conducted the truncated analysis to demonstrate that Leu71 of ubiquitin is necessary for its interaction with Lpg2148. Moreover, Val33 of Lpg2148â¯at the edge of a channel plays a vital role in the interaction and is limited by the length of the C-terminus of ubiquitin, which may help to explain the selectivity of ubiquitin over NEDD8. In summary, these results enrich our knowledge of substrate recognition of deamidase.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Ubiquitin
/
Amidohydrolases
Type of study:
Prognostic_studies
Limits:
Humans
Language:
En
Journal:
Biochem Biophys Res Commun
Year:
2018
Type:
Article
Affiliation country:
China