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The multifunctional Kaposi's sarcoma-associated herpesvirus (KSHV) latent protein latency-associated nuclear antigen 2 (LANA2) has a critical role in KSHV-induced B-cell malignancies. LANA2 increases the level of small ubiquitin-like modifier (SUMO)2-ubiquitin-modified PML and induces the disruption of PML oncogenic domains (PODs) by a process that requires a non-covalent SUMO interaction domain (SIM) in LANA2. We now demonstrate that LANA2 is covalently conjugated to SUMO1 and SUMO2 both in vitro and in latently KSHV-infected B-cells. We show that a LANA2 SIM mutant exhibits a slightly altered sumoylation pattern, which suggests that non-covalent SUMO interactions represent a mechanism for determining SUMO substrate recognition and modification. In addition, several lysine residues were mapped as SUMO conjugation sites. A sumoylation-deficient mutant shows impaired ability to induce disruption of PODs, which suggests that either directly bound or covalently conjugated SUMO moieties may act as a bridge for interaction between LANA2 and other SUMO-modified or SUMO-interacting proteins required for disruption of PODs.
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Journal of General Virology vol. 92 , part 1, pp. 188–194.
Supplementary Fig. S1. Modification of PML by SUMO1 in vivo Supplementary Fig. S2. SUMO interaction domain contributes to SUMOylation in LANA2 Supplementary Fig. S3. LANA2 protein stability is unaffected by SUMOylation Supplementary Fig. S4. SUMO conjugation to LANA2 contributes to the degradation of haemagglutinin–PML Supplementary Table S1. Putative SUMO-binding domains for LANA2 Supplementary Table S2. Oligonucleotides for LANA2 mutagenesis