UL36 Encoded by Marek's Disease Virus Exhibits Linkage-Specific Deubiquitinase Activity

International Journal of Molecular Sciences
Junyan LinMengyun Wang

Abstract

(1) Background: Deubiquitinase (DUB) regulates various important cellular processes via reversing the protein ubiquitination. The N-terminal fragment of a giant tegument protein, UL36, encoded by the Marek's disease (MD) virus (MDV), encompasses a putative DUB (UL36-DUB) and shares no homology with any known DUBs. The N-terminus 75 kDa fragment of UL36 exists in MD T lymphoma cells at a high level and participates in MDV pathogenicity. (2) Methods: To characterize deubiquitinating activity and substrate specificity of UL36-DUB, the UL36 N-terminal fragments, UL36(323), UL36(480), and mutants were prepared using the Bac-to-Bac system. The deubiquitinating activity and substrate specificity of these recombinant UL36-DUBs were analyzed using various ubiquitin (Ub) or ubiquitin-like (UbL) substrates and activity-based deubiquitinating enzyme probes. (3) Results: The results indicated that wild type UL36-DUBs show a different hydrolysis ability against varied types of ubiquitin chains. These wild type UL36-DUBs presented the highest activity to K11, K48, and K63 linkage Ub chains, weak activity to K6, K29, and K33 Ub chains, and no activity to K27 linkage Ub chain. UL36 has higher cleavage efficiency for K48 and K63 poly-ubiquitin t...Continue Reading

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Citations

May 1, 2021·International Journal of Molecular Sciences·Jessica ProulxIn-Woo Park

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Datasets Mentioned

BETA
M14693.1

Methods Mentioned

BETA
pull-down
ubiquitination
PCR

Software Mentioned

DOG
GraphPad
Codon OptimWiz
GraphPad Prism

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