{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nThe provided abstracts do not contain any explicit mention or data regarding PABPC1L2B‑AS1. Instead, the studies focus on several other proteins and signaling mechanisms that impact protein conformation and immune regulation. For example, one study investigates the role of copper binding to the prion protein. In this work, a previously unstructured region of the prion protein (residues 90–115) was shown to bind Cu²⁺ with nanomolar affinity, involving both His96 and His111 ligands and leading to conformational changes that promote β‑sheet formation, a key event in prion propagation and the onset of prion diseases."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nAnother set of studies characterizes members of the LUSTR family of proteins that include GPR107 and GPR108. The cloning and genomic organization of human GPR107 and its murine counterpart Gpr108 were first reported, highlighting their structural domains––an amino‑terminal signal peptide, a long extracellular region, and a seven‑transmembrane domain similar to G protein‑coupled receptors."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": " Subsequent work on GPR108 demonstrated that, although its overexpression can activate NF‑κB robustly, in physiological contexts this receptor acts as an antagonist to Toll‑like receptor (TLR) signaling. Loss of GPR108 in macrophages led to enhanced cytokine secretion and increased NF‑κB and IRF3 signaling, indicating its role in tempering innate immune responses. Specifically, GPR108 modulates TLR signaling by reducing MyD88 expression and impeding its association with TLR4, a process further refined through interactions with adaptor molecules."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "3"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn a related study, GPR108 was shown to localize to the Golgi apparatus and regulate antiviral immunity. GPR108 enhances the Smurf1‑mediated K63‑linked polyubiquitination of phosphorylated IRF3, which in turn promotes autophagic degradation of IRF3 via an NDP52‑dependent mechanism. This regulatory pathway effectively suppresses type I interferon responses against both DNA and RNA viruses, underscoring the receptor’s role in balancing antiviral defense and host homeostasis."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "4"}]}, {"type": "t", "text": "\n"}]}, {"type": "t", "text": "\n\n"}, {"type": "p", "children": [{"type": "t", "text": "\nIn summary, while the aforementioned studies provide important insights into copper‑mediated conformational changes in prion proteins and the multifaceted roles of GPR108 (and related LUSTR family members) in immune signaling and antiviral regulation, they do not address or describe any function for PABPC1L2B‑AS1. Thus, further investigation and literature are needed to elucidate the biological role of PABPC1L2B‑AS1.\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Christopher E Jones, Salama R Abdelraheim, David R Brown, et al. "}, {"type": "b", "children": [{"type": "t", "text": "Preferential Cu2+ coordination by His96 and His111 induces beta-sheet formation in the unstructured amyloidogenic region of the prion protein."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2004)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M403467200"}], "href": "https://doi.org/10.1074/jbc.M403467200"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "15145944"}], "href": "https://pubmed.ncbi.nlm.nih.gov/15145944"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Alasdair J Edgar "}, {"type": "b", "children": [{"type": "t", "text": "Human GPR107 and murine Gpr108 are members of the LUSTR family of proteins found in both plants and animals, having similar topology to G-protein coupled receptors."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "DNA Seq (2007)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1080/10425170701207182"}], "href": "https://doi.org/10.1080/10425170701207182"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "17454009"}], "href": "https://pubmed.ncbi.nlm.nih.gov/17454009"}]}, {"type": "r", "ref": 3, "children": [{"type": "t", "text": "Danfeng Dong, Haisheng Zhou, Soon-Young Na, et al. "}, {"type": "b", "children": [{"type": "t", "text": "GPR108, an NF-κB activator suppressed by TIRAP, negatively regulates TLR-triggered immune responses."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "PLoS One (2018)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1371/journal.pone.0205303"}], "href": "https://doi.org/10.1371/journal.pone.0205303"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "30332431"}], "href": "https://pubmed.ncbi.nlm.nih.gov/30332431"}]}, {"type": "r", "ref": 4, "children": [{"type": "t", "text": "Mengyuan Zhao, Yong Zhang, Lihua Qiang, et al. "}, {"type": "b", "children": [{"type": "t", "text": "A Golgi-resident GPR108 cooperates with E3 ubiquitin ligase Smurf1 to suppress antiviral innate immunity."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cell Rep (2023)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.celrep.2023.112655"}], "href": "https://doi.org/10.1016/j.celrep.2023.112655"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "37330913"}], "href": "https://pubmed.ncbi.nlm.nih.gov/37330913"}]}]}]}