{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\n Two independent studies have characterized Golgi‐associated Rab2B effector proteins that are crucial for both maintaining Golgi structure and modulating innate immune signaling. In one study, a protein designated as “Golgi‐associated Rab2B interactor‐like 4” (which we refer to here as GARIN4) was identified as a novel, Golgi‐resident binding partner specific for Rab2B. Loss‐of‐function experiments revealed that knockdown of GARIN4 produced a fragmented Golgi apparatus—phenocopying the effects observed when individual Rab isoforms were silenced—thus underscoring its critical role in preserving the compact morphology of the Golgi complex in mammalian cells."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n In a related study focusing on antiviral responses, the small GTPase RAB2B was shown to recruit a distinct effector protein, Golgi‐associated Rab2B interactor‐like 5 (GARIL5), to the Golgi apparatus following cytosolic DNA stimulation. Although GARIL5 is a separate entity from GARIN4, its characterization reinforces the paradigm that Rab2B effectors localized at the Golgi not only modulate Golgi integrity but also serve as platforms for assembling signaling complexes—for example, those involved in the cGAS–STING pathway that drives interferon responses against DNA viruses."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "2"}]}, {"type": "t", "text": "\n "}]}, {"type": "t", "text": "\n "}, {"type": "p", "children": [{"type": "t", "text": "\n Together, these findings illuminate the multifaceted roles of Golgi-associated Rab2B effector proteins. Specifically, GARIN4 appears to be indispensable for maintaining Golgi structure, likely acting through isoform-specific interactions with Rab2B and distinct effector complexes, whereas related proteins like GARIL5 participate in innate immune signaling. This emerging functional diversity among Rab2B interactors highlights how spatial regulation at the Golgi underpins both organelle homeostasis and host defense mechanisms.\n "}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Megumi Aizawa, Mitsunori Fukuda "}, {"type": "b", "children": [{"type": "t", "text": "Small GTPase Rab2B and Its Specific Binding Protein Golgi-associated Rab2B Interactor-like 4 (GARI-L4) Regulate Golgi Morphology."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "J Biol Chem (2015)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1074/jbc.M115.669242"}], "href": "https://doi.org/10.1074/jbc.M115.669242"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "26209634"}], "href": "https://pubmed.ncbi.nlm.nih.gov/26209634"}]}, {"type": "r", "ref": 2, "children": [{"type": "t", "text": "Michihiro Takahama, Mitsunori Fukuda, Norihiko Ohbayashi, et al. "}, {"type": "b", "children": [{"type": "t", "text": "The RAB2B-GARIL5 Complex Promotes Cytosolic DNA-Induced Innate Immune Responses."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Cell Rep (2017)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1016/j.celrep.2017.08.085"}], "href": "https://doi.org/10.1016/j.celrep.2017.08.085"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "28930687"}], "href": "https://pubmed.ncbi.nlm.nih.gov/28930687"}]}]}]}