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RSK1 SUMOylation is required for KSHV lytic replication.

Zhenshan Liu1,2, Chengrong Liu1,2, Xin Wang1,2

  • 1Research Center of Translational Medicine, Shanghai Children's Hospital, Shanghai Jiao Tong University, Shanghai, China.

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Summary
This summary is machine-generated.

Ribosomal S6 kinase 1 (RSK1) SUMOylation is crucial for Kaposi's sarcoma-associated herpesvirus (KSHV) replication. This modification regulates RSK1's ability to phosphorylate downstream targets like eIF4B, impacting viral lytic replication.

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Area of Science:

  • Molecular Biology
  • Virology
  • Post-Translational Modifications

Background:

  • Ribosomal S6 kinase 1 (RSK1), a MAPK pathway kinase, regulates cellular processes and is vital for viral lytic replication, including Kaposi's sarcoma-associated herpesvirus (KSHV).
  • The role of post-translational modifications beyond phosphorylation in regulating RSK1 function remains largely unexplored.

Purpose of the Study:

  • To investigate the role of SUMOylation, a key post-translational modification, in regulating RSK1 function during KSHV lytic replication.
  • To identify specific sites of RSK1 SUMOylation and their impact on kinase activity and substrate phosphorylation.

Main Methods:

  • Western blotting to detect SUMOylation of RSK1.
  • Site-directed mutagenesis to create SUMOylation-deficient RSK1 mutants (K110/335/421R).
  • Analysis of RSK1 kinase activity and downstream substrate phosphorylation (e.g., eIF4B).
  • Bioinformatic analysis to identify SUMO-interacting motifs (SIMs).

Main Results:

  • RSK1 undergoes robust SUMOylation at lysine residues K110, K335, and K421 during KSHV lytic replication.
  • SUMOylation does not affect RSK1 activation or kinase activity but alters its substrate phosphorylation profile, notably reducing phosphorylation of the RxRxxS*/T* motif.
  • SUMOylation-deficient RSK1 exhibits impaired phosphorylation of the downstream substrate eIF4B.
  • eIF4B possesses a SUMO-interacting motif (SIM) that mediates interaction with RSK1 via SUMO-SIM interaction.

Conclusions:

  • SUMOylation of RSK1 is a critical post-translational modification regulating its substrate phosphorylation.
  • This SUMOylation-dependent regulation of RSK1 activity is essential for efficient KSHV lytic replication.
  • The interaction between SUMOylated RSK1 and eIF4B via SIM is a key mechanism in this process.