TY - JOUR
AU - Ferrero, Diego sebastian
AU - Gimenez, María Cecilia
AU - Sagar, Amin
AU - Rodríguez, Javier María
AU - Castón, José R
AU - Terebiznik, Mauricio R
AU - Bernadó, Pau
AU - Verdaguer, Nuria
TI - Structure of the amino terminal domain of the birnaviral multifunctional VP3 protein and its unexplored critical role
JO - PNAS nexus
VL - 3
IS - 12
SN - 2752-6542
CY - Oxford
PB - Oxford University Press
M1 - PUBDB-2024-07320
SP - pgae521
PY - 2024
AB - To overcome their limited genetic capacity, numerous viruses encode multifunctional proteins. The birnavirus VP3 protein plays key roles during infection, including scaffolding of the viral capsid during morphogenesis, recruitment, and regulation of the viral RNA polymerase, shielding of the double-stranded RNA genome and targeting of host endosomes for genome replication, and immune evasion. The dimeric form of VP3 is critical for these functions. In previous work, we determined the X-ray structure of the central domains (D2–D3) of VP3 from the infectious bursal disease virus (IBDV). However, the structure and function of the IBDV VP3 N-terminal domain (D1) could not be determined at that time. Using integrated structural biology approaches and functional cell assays, here we characterize the IBDV VP3 D1 domain, unveiling its unexplored roles in virion stability and infection. The X-ray structure of D1 shows that this domain folds in four α-helices arranged in parallel dimers, which are essential for maintaining the dimeric arrangement of the full-length protein. Combining small-angle X-ray scattering analyses with molecular dynamics simulations allowed us to build a structural model for the D1–D3 domains. This model consists of an elongated structure with high flexibility in the D2–D3 connection, keeping D1 as the only driver of VP3 dimerization. Using reverse genetics tools, we show that the obliteration of D1 domain prevents the VP3 scaffold function during capsid assembly and severely impacts IBDV infection. Altogether, our study elucidates the structure of the VP3 D1 domain and reveals its role in VP3 protein dimerization and IBDV infection.
LB - PUB:(DE-HGF)16
C6 - 39677362
UR - <Go to ISI:>//WOS:001377106200001
DO - DOI:10.1093/pnasnexus/pgae521
UR - https://bib-pubdb1.desy.de/record/619020
ER -