Abstract：
:Infectious spleen and kidney necrosis virus (ISKNV) is the etiological agent that causes a pandemic and severe disease in fish characteristic of enlarged and damaged spleen and kidney. To identify viral proteins involved in infection and pathogenesis, we characterized five open reading frames (ORFs) of the ISKNV genome, ORF12, ORF65, ORF66, ORF99 and ORF111, which encode RING finger proteins (RFPs). We assessed the ubiquitin ligase (E3) activity of these recombinant RFPs fused to maltose-binding protein (MBP) using an in vitro ubiquitination assay and demonstrated that ORF12, ORF65, ORF66 and ORF111 possess the E3 activity in the presence of ubiquitin activating enzyme (E1), ubiquitin conjugating enzyme (E2), ubiquitin and zinc ion. E3 activity of ISKNV RFPs strictly depends on the UbcH5 E2 subfamily (ORF12 and ORF65 depend on UbcH5a/c, ORF66 and ORF111 depend on UbcH5a/b/c). Furthermore, point mutation in the RING domain completely abrogated ORF66 E3 activity, indicating the RING motif was essential for RFP of ISKNV. In addition, zinc ion was required as an enhancer for ISKNV RFP to exert its E3 function. Investigation of RFPs of ISKNV helps to understand their functions in the infection process and in the virus-host interaction.
journal_name
Virus Resjournal_title
Virus researchauthors
Xie J,Zhu J,Yang H,Weng S,Chen C,Chen H,Xie Q,Li M,He Jdoi
10.1016/j.virusres.2006.09.003subject
Has Abstractpub_date
2007-02-01 00:00:00pages
170-7issue
2eissn
0168-1702issn
1872-7492pii
S0168-1702(06)00275-9journal_volume
123pub_type
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