| Pathway/Process | Molecular Partners/Targets | Mechanism of Action | Functional Outcome |
|---|---|---|---|
| RIG-I/MAVS antiviral signaling | MAVS, RIG-I, MDA5, PCBP2 | NLRX1 has been reported to associate with MAVS and interfere with RIG-I/MAVS complex formation; it can also promote PCBP2-dependent proteasomal degradation of MAVS. These effects generally dampen downstream IRF3/NF-κB signaling, although some studies note context- and cell-type-dependent disagreement. (pqac-00000005, pqac-00000001) | Usually decreases type I interferon and antiviral inflammatory responses to RNA viruses; function appears context dependent rather than universally inhibitory. (pqac-00000005, pqac-00000001) |
| cGAS-STING DNA sensing | STING, TBK1, cGAS | NLRX1 has been proposed to sequester STING or limit STING-TBK1 association, analogous to its reported effects on MAVS-dependent signaling; recent injury and viral-infection literature continues to place NLRX1 upstream of cGAS-STING regulation. (pqac-00000005, pqac-00000001) | Typically restrains type I interferon production and inflammatory signaling in response to cytosolic DNA or mtDNA leakage. (pqac-00000005, pqac-00000001) |
| NF-κB inflammation | TRAF6, IKK, IκB, NF-κB | Structural/drug-discovery work and prior functional studies indicate that NLRX1 negatively regulates NF-κB signaling, including through interactions that prevent IKK-mediated IκB phosphorylation and through TRAF6-associated suppression of inflammatory signaling. (pqac-00000002, pqac-00000005) | Reduced transcription of pro-inflammatory genes and dampened inflammatory signaling; relevant to inflammatory disease targeting. (pqac-00000002, pqac-00000001) |
| mTOR/AMPK metabolism | mTOR, RISK kinases (Akt, ERK, S6K), AMPK | NLRX1 influences the balance between anabolic and stress-response signaling. In cardiac ischemia-reperfusion models, NLRX1 supports mTOR and RISK pathway activation, while NLRX1 deficiency is associated with compensatory AMPK activation; other immunometabolic studies link NLRX1 to altered OXPHOS/glycolysis and fatty acid metabolism. (pqac-00000009, pqac-00000012) | Coordinates metabolic adaptation, stress responses, and tissue protection; effects are tissue-specific and can alter susceptibility to ischemic or inflammatory injury. (pqac-00000009, pqac-00000012) |
| Mitophagy receptor function | LC3, LC3 lipidation machinery, mitochondrial import-stress signals | Recent work positions NLRX1 as a mitophagy regulator/receptor. It promotes selective mitochondrial clearance by engaging LC3-related autophagy machinery, and broader literature frames mitophagy control as a core unifying NLRX1 function. (pqac-00000000, pqac-00000008) | Maintains mitochondrial quality control by promoting removal of damaged mitochondria, thereby limiting secondary inflammatory and metabolic dysfunction. (pqac-00000000, pqac-00000008) |
| Mitochondrial dynamics / Zn2+ trafficking | SLC39A7/ZIP7, DNM1L/DRP1, OPA1, OMA1, PINK1-PRKN | In nucleus pulposus cells, NLRX1 forms an NLRX1-SLC39A7 complex on mitochondrial membranes and regulates mitochondrial Zn2+ trafficking, coordinating fission/fusion factors with mitophagy. Loss of NLRX1 causes mitochondrial collapse and compensatory PINK1-PRKN pathway activation. (pqac-00000007) | Preserves balanced mitochondrial dynamics and beneficial mitophagy, preventing senescence-associated mitochondrial failure and inflammatory degeneration. (pqac-00000007) |
| OXPHOS regulation / mitochondrial gene expression | FASTKD5, mitochondrial RNA granules, respiratory complexes I and IV, UQCRC2 | NLRX1 associates with FASTKD5 in the mitochondrial matrix, influencing mitochondrial transcript processing, respiratory-complex expression, ribosome biogenesis/translation, and OXPHOS output. NLRX1 also interacts with UQCRC2, linking it to respiratory-chain function and ROS regulation. (pqac-00000012, pqac-00000005) | Alters oxidative phosphorylation, glycolysis coupling, and mitochondrial bioenergetics in immune and nonimmune cells; can support virus-associated or tissue-specific metabolic programs. (pqac-00000012, pqac-00000005) |
| mPTP regulation | mPTP, mitochondrial calcium handling machinery, phosphoproteins in inner mitochondrial membrane | In a 2025 cardiac study, NLRX1 was localized to the inner mitochondrial membrane and found to be required for calcium-induced mPTP opening; deletion abolished mPTP opening and altered mitochondrial calcium retention and phosphoprotein states. (pqac-00000006, pqac-00000009) | NLRX1 modulates mitochondrial permeability transition and cardioprotective signaling during ischemia-reperfusion, linking innate immune sensing to acute mitochondrial stress responses. (pqac-00000006, pqac-00000009) |


*Table: This table summarizes the main signaling pathways and biochemical functions currently attributed to human NLRX1 from recent and foundational literature. It is useful for functional annotation because it links each pathway to specific molecular partners, mechanistic evidence, and biological outcomes.*