{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRecent findings indicate that THAP12—previously characterized as death‐associated protein 4 (DAP4) in one study—functions as a nuclear adaptor that modulates apoptotic signaling. In this work, an inactive MST1 mutant was found to associate with endogenous DAP4 (THAP12), a 761–amino acid protein that, despite lacking obvious catalytic domains, shares significant sequence identity with a putative modulator of protein kinase R. THAP12 is constitutively nuclear and homodimerizes through its amino terminus, while its carboxyl terminus binds MST1. By bridging the largely cytoplasmic MST1 (which shuttles into the nucleus) with the tumor suppressor p53, THAP12 potentiates MST1-induced apoptosis in a dose-dependent manner, even though it is not itself phosphorylated by MST1 nor does it alter MST1 kinase activity."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn contrast, another study has described a distinct regulatory adaptor protein, PRKRIR, which, although not THAP12, highlights a parallel strategy in cellular control mechanisms. PRKRIR physically interacts with the RNA sensor RIG-I and stabilizes its protein levels by blocking poly-ubiquitination and subsequent degradation. This stabilization strongly enhances type I interferon production, thereby augmenting the host antiviral response and efficiently curtailing virus replication."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": ""}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nTogether, these studies underscore how adaptor proteins like THAP12 and PRKRIR are key modulators of critical cellular processes—ranging from the orchestration of p53-dependent apoptotic pathways to the fine-tuning of innate antiviral defenses. Although operating in different signaling contexts, both proteins exemplify the importance of scaffold molecules in coordinating the spatial and temporal aspects of signal transduction, offering potential targets for therapeutic intervention in diseases marked by dysregulated apoptosis or impaired interferon responses.\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Yenshou Lin, Andrei Khokhlatchev, Daniel Figeys, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Death-associated protein 4 binds MST1 and augments MST1-induced apoptosis."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2002)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M202630200"}], "href": "https://doi.org/10.1074/jbc.M202630200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "12384512"}], "href": "https://pubmed.ncbi.nlm.nih.gov/12384512"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Hesung Now, Joo-Yeon Yoo "}, {"type": "b", "children": [{"type": "t", "text": "A protein-kinase, IFN-inducible double-stranded RNA dependent inhibitor and repressor of p58 (PRKRIR) enhances type I IFN-mediated antiviral response through the stability control of RIG-I protein."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Biochem Biophys Res Commun (2011)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.bbrc.2011.08.127"}], "href": "https://doi.org/10.1016/j.bbrc.2011.08.127"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "21910972"}], "href": "https://pubmed.ncbi.nlm.nih.gov/21910972"}]}]}]}