Interactive Spaceflight Pathway Studio
Project measured NASA OSDR microgravity transcriptomics and proteomics directly onto declarative bioenergetic maps. Dynamic Okabe-Ito diverging palette, statistical significance gating, live pathway telemetry HUD, and interactive slide-over multi-omics inspector.
Declarative Pathway & Organelle Map Catalog
Derived deterministically from text metrics; zero hardcoded coordinatesPlant Mitochondrial Electron Transport and Oxidative Phosphorylation
Conserved respiratory Complexes I–V integrated with plant-specific bypasses (AOX, Type II NDHs, and the Complex I Carbonic Anhydrase domain).
Chloroplast Light Reactions, Carbon Fixation, and Retrograde Origins
Thylakoid electron transport coupled to RuBisCO carbon/oxygen fixation and the initiation of plastid retrograde messengers.
Nuclear Transcriptional Command and Organelle Reprogramming
The nuclear convergence hub where mitochondrial and plastid retrograde signals reprogram the genome to adjust bioenergetics.
Plasma Membrane Perception, Gravity Sensing, and Systemic Waves
Cell surface mechanical and gravity sensing driving calcium spikes and apoplastic ROS waves that propagate inward to mitochondria and chloroplasts.
The Mitochondrial Retrograde Response (MRR) Cascade
From cristae respiratory stress to nuclear MDRE promoter activation via the rhomboid protease-cleaved ANAC017/013 transcription factor axis.
The Plastid-to-Nucleus Retrograde Response (PRR) Circuits
Four parallel communication channels conveying chloroplast operational state, pigment biosynthesis, and redox stress to the nucleus.
The 3-Organelle Photorespiratory Metabolic Loop
The obligatory metabolic partnership of Chloroplasts, Peroxisomes, and Mitochondria recycling 2-phosphoglycolate produced by RuBisCO oxygenation.
Organelle Membrane Contact Sites (MCS) and Stromule-Nuclear Docking
Non-vesicular lipid and ion exchange across physical organellar contact sites, and dynamic chloroplast stromule docking directly onto the nuclear envelope.
Cross-Kingdom Synteny: Broad MitoCarta 3.0 vs Plant Mitochondrial Proteome
Systematic alignment of conserved catalytic bioenergetics with plant-specific metabolic innovations, bypasses, and dual-targeted endosymbiotic machinery.
Integrated Multi-Organelle Digital Double Atlas
The unified plant cell: Mitochondrion, Chloroplast, Nucleus, and Plasma Membrane bound by retrograde signaling, metabolic shuttles, and systemic waves.
Rendered Interactive Pathway Maps
Process Description vector maps compiled with Okabe-Ito colorblind-safe palettes and evidence tiers explicitly encoded as border channels. Click any map to view full-scale or download standalone SVG/SBGN-ML representations.
The plant mitochondrial electron transport chain redrawn to contrast conserved catalytic complexes with plant-specific metabolic innovations. Unlike mammalian mitochondria (MitoCarta 3.0), plants possess cyanide-resistant alternative oxidase (AOX) and rotenone-insensitive type II NAD(P)H dehydrogenases (NDA/NDB/NDC), allowing respiratory electron flux without proton translocation when cellular energy charge is high. The unique matrix-facing Carbonic Anhydrase (CA) domain of Complex I is essential for complex stability and coordinates with photorespiratory flux.
The photosynthetic machinery drawn to emphasize metabolic connections and retrograde stress signaling. Light absorption by PSII and PSI drives the linear electron flow producing NADPH and ATP for the Calvin-Benson cycle. Excess light or translational stress generates singlet oxygen at PSII and redox stress in the stroma, inactivating SAL1 phosphatase and triggering the accumulation of 3'-phosphoadenosine 5'-phosphate (PAP) and 2-C-methyl-D-erythritol 2,4-cyclodiphosphate (MEcPP). RuBisCO oxygenation initiates the photorespiratory cycle.
The nuclear genome receives direct signals from both endosymbiotic organelles. Cleaved ANAC017 and ANAC013 enter via nuclear pore complexes to bind the Mitochondrial Dysfunction Responsive Element (MDRE: CTTGNNNNNCAG), driving high-level transcription of AOX1a and mitochondrial chaperones. Concurrently, translocated PAP from chloroplasts inhibits 5'-to-3' exoribonucleases (XRN2/3), altering transcriptional termination. Plastid GUN1 signals stimulate ABI4 to repress Photosynthesis-Associated Nuclear Genes (PhANGs) while antagonizing GLK1/2 transcriptional activators.
The plasma membrane serves as the sensory boundary of the plant cell. Mechanical forces, cell wall strain, or microgravity alterations trigger wall-associated kinases (WAK1) and FERONIA, while membrane stretch gates MSL10 and GLR3.3/3.6 calcium channels. Cytosolic calcium spikes activate RBOHD NADPH oxidases to generate an extracellular superoxide burst, which dismutates to H2O2 and re-enters through PIP2;1 aquaporins, initiating organellar redox remodeling.
Mitochondrial retrograde signaling communicates organelle dysfunction to the nuclear genome. Inhibition of OXPHOS or microgravity hypoxia elevates mitochondrial ROS and activates rhomboid-like proteases that cleave the C-terminal transmembrane domain of ANAC017 and ANAC013 anchored at the outer mitochondrial membrane / ER interface. The liberated soluble N-terminal NAC domain migrates through nuclear pores, binds the 14-bp palindromic MDRE motif (CTTGNNNNNCAG) in the AOX1a promoter, and induces alternative oxidase and mitochondrial chaperones to restore bioenergetic equilibrium.
Chloroplasts communicate with the nucleus via four distinct pathways. (1) In the SAL1-PAP pathway, oxidative stress inactivates stromal SAL1 phosphatase; its substrate, PAP (3'-phosphoadenosine 5'-phosphate), accumulates and is exported via PAPST1 to the nucleus, directly inhibiting 5'-to-3' exoribonucleases (XRN2/3) to stabilize stress transcripts. (2) In the GUN1 hub, plastid translation and tetrapyrrole perturbations signal through ABI4 to repress PhANGs. (3) The MEP pathway intermediate MEcPP accumulates during stress and acts as an autonomous retrograde messenger. (4) Singlet oxygen (1O2) produced at PSII is sensed by EXECUTER 1/2 (EX1/EX2) to direct acclimation or cell death.
Photorespiration is the premier example of obligate inter-organellar metabolic coupling in plant biology. When RuBisCO fixes oxygen instead of CO2, toxic 2-phosphoglycolate is produced in chloroplasts. It is dephosphorylated to glycolate and exported via PLGG1 to peroxisomes, where glycolate oxidase (GOX) oxidizes it to glyoxylate (generating H2O2 scavenged by CAT2) and glutamate:glyoxylate aminotransferase (GGT) transaminates it to glycine. Glycine enters the mitochondrial matrix, where the massive Glycine Decarboxylase (GDC) complex and SHMT1 convert two molecules of glycine into serine, releasing CO2, NH3, and NADH. Serine returns to the peroxisome, is transaminated to hydroxypyruvate, reduced to glycerate by HPR, and returned via DiT1/PLGG1 to the chloroplast to re-enter the Calvin cycle as 3-PGA.
Subcellular organelles do not float freely; they are dynamically interconnected by physical membrane contact sites (MCS). Chloroplasts extend stroma-filled tubules (stromules) along microfilaments that physically dock to the nuclear envelope, channelling high concentrations of H2O2 directly into the nucleoplasm during stress and plant immune defense. Mitochondria-ER Associated Membranes (MEAMs) mediate phospholipid transfer and localized calcium microdomains, while chloroplast-ER junctions (TGD complexes) facilitate galactolipid and sulfolipid biogenesis.
Comparison of the 1,136 human genes and 149 MitoPathways from Broad MitoCarta 3.0 with the plant mitochondrial proteome. Core bioenergetics (catalytic subunits of Complexes I–V, TCA cycle, Fe-S ISC assembly) exhibit near-perfect 1:1 orthology. In contrast, plants evolved vital metabolic innovations: cyanide-resistant AOX, rotenone-insensitive internal/external NDHs, a matrix-facing Carbonic Anhydrase domain on Complex I, and the massive photorespiratory GDC complex. Additionally, key organellar machinery (DNA polymerase PolIA/B, aminoacyl-tRNA synthetases) evolved dual targeting to simultaneously coordinate mitochondria and chloroplasts.
The master synoptic architecture uniting the four subcellular digital doubles. The Plasma Membrane monitors mechanical, gravity, and apoplastic forces (FERONIA/WAK1), launching calcium spikes (GLR3.3/3.6) and ROS waves (RBOHD) channeled through PIP2;1 aquaporins. The Chloroplast coordinates photosynthetic electron transport with the 4 plastid retrograde signals (SAL1-PAP, GUN1-ABI4, MEcPP, Singlet oxygen-EX1) and feeds the photorespiratory metabolic conduit via PLGG1. The Mitochondrion provides ATP and metabolic flexibility via respiratory complexes and plant bypasses (AOX, NDHs), drives matrix photorespiration through GDC/SHMT1, and initiates the ANAC017/013 mitochondrial retrograde response (MRR). The Nucleus integrates these organellar signals at MDRE and PhANGs promoters, reprograming the transcriptome to ensure plant survival under terrestrial and spaceflight environments.