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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Tumor suppressor NM23-H1 is a granzyme A-activated DNase during CTL-mediated apoptosis, and the nucleosome assembly protein SET is its inhibitor.

Granzyme A (GzmA) induces a caspase-independent cell death pathway characterized by single-stranded DNA nicks and other features of apoptosis. A GzmA-activated DNase (GAAD) is in an ER associated complex containing pp32 and the GzmA substrates SET, HMG-2, and Ape1. We show that GAAD is NM23-H1, a nucleoside diphosphate kinase implicated in suppression of tumor metastasis, and its specific inhibitor (IGAAD) is SET. NM23-H1 binds to SET and is released from inhibition by GzmA cleavage of SET. After GzmA loading or CTL attack, SET and NM23-H1 translocate to the nucleus and SET is degraded, allowing NM23-H1 to nick chromosomal DNA. GzmA-treated cells with silenced NM23-H1 expression are resistant to GzmA-mediated DNA damage and cytolysis, while cells overexpressing NM23-H1 are more sensitive.[1]

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