{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe SMC5 protein, as an integral component of the SMC5/6 complex, plays a pivotal role in antiviral defense by restricting transcription from extrachromosomal viral genomes. Multiple studies demonstrate that viruses—including hepatitis B, HIV‐1, and papillomaviruses—have evolved strategies to overcome this intrinsic repression by targeting the complex for inactivation or degradation. For instance, viral regulatory proteins can hijack host ubiquitin ligases to trigger SMC5/6 complex degradation, thereby allowing extrachromosomal templates to be efficiently transcribed and viral replication to proceed."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "1", "end_ref": "7"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn addition to its antiviral activity, SMC5 is essential for genome stability by mediating proper DNA repair and cell cycle progression. The SMC5/6 complex is recruited to sites of DNA double‐strand breaks and promotes homologous recombination repair—especially the repair events relying on sister chromatid exchange—thus ensuring accurate DNA replication and chromosome segregation. Loss or depletion of SMC5 has been linked to premature sister chromatid separation, impaired recruitment of other repair factors such as cohesin, and an accumulation of unrepaired DNA lesions, all of which compromise mitotic fidelity."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "8", "end_ref": "13"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nStructurally, SMC5 contributes to the higher‐order organization of chromosomes by engaging in DNA compaction and topological regulation. Beyond its involvement in telomere maintenance in alternative lengthening of telomeres (ALT) cancer cells, the SMC5/6 complex is now recognized as a dynamic DNA “micro‐compaction” machine that uses ATP hydrolysis to modulate chromatin architecture and transcriptional accessibility. Detailed biochemical and structural studies have elucidated unique interaction interfaces and hinge domains that underlie not only the assembly and stability of the complex but also its role in safeguarding genome integrity—a function underscored by genetic disorders linked to mutations in SMC5 pathways."}, {"type": "fg", "children": [{"type": "fg_fs", "start_ref": "14", "end_ref": "26"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Adrien Decorsière, Henrik Mueller, Pieter C van Breugel, et al. 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