Cell
Volume 112, Issue 5, 7 March 2003, Pages 659-672
Journal home page for Cell

Article
Tumor Suppressor NM23-H1 Is a Granzyme A-Activated DNase during CTL-Mediated Apoptosis, and the Nucleosome Assembly Protein SET Is Its Inhibitor

https://doi.org/10.1016/S0092-8674(03)00150-8Get rights and content
Under an Elsevier user license
open archive

Abstract

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.

Cited by (0)

1

These authors contributed equally to this work.