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The gene tax-4 (UniProt: Q03611, ORF name ZC84.2) encodes the α subunit of a cyclic nucleotide-gated (CNG) cation channel in Caenorhabditis elegans. The gene name derives from "abnormal chemotaxis," reflecting the chemotaxis defects observed in loss-of-function mutants. The identity is confirmed: tax-4 encodes a CNG channel α subunit belonging to the cyclic nucleotide-gated cation channel family, with characteristic domains including a cyclic nucleotide-binding domain (CNBD, IPR000595), a C-linker/CLZ domain (IPR032406), and the CNG cation channel domain (IPR050866). These features are fully consistent with the UniProt annotation and the extensive literature described below.
| Property | Summary |
|---|---|
| Gene name | tax-4 (also known historically as abnormal chemotaxis protein 4) (bargmann2006chemosensationinc. pages 10-12) |
| Protein name | Cyclic nucleotide-gated channel TAX-4 (CNG channel subunit) (inada2006identificationofguanylyl pages 1-2, li2017structureofa pages 1-2) |
| UniProt accession | Q03611 |
| Organism | Caenorhabditis elegans (inada2006identificationofguanylyl pages 1-2, li2017structureofa pages 1-2) |
| Protein type | Cyclic nucleotide-gated (CNG) nonselective cation channel involved in sensory transduction (inada2006identificationofguanylyl pages 1-2, bargmann2006chemosensationinc. pages 10-12, troemel1999chemosensorysignalingin pages 5-6) |
| Channel subunit type | α subunit of the TAX-2/TAX-4 CNG channel; TAX-4 can also form functional homomeric channels (okahata2022molecularphysiologyregulating pages 2-4, bargmann2006chemosensationinc. pages 10-12) |
| Partner subunit | TAX-2 (β subunit), which enhances TAX-4 channel activity in heteromeric channels (okahata2022molecularphysiologyregulating pages 2-4, bargmann2006chemosensationinc. pages 10-12) |
| Neurons expressing TAX-4 | Strong evidence supports expression/requirement in multiple head sensory neurons including ASE, AWC, AWB, AFD, ASI, ASJ, ASG, ASK; later pathway summaries also place TAX-4 in BAG and PQR sensory signaling contexts (wexler2020c.elegansmales pages 7-9, bargmann2006chemosensationinc. pages 10-12, troemel1999chemosensorysignalingin pages 5-6, galande2025rolesofcyclic pages 15-16) |
| Subcellular localization | Localized to sensory cilia / ciliary membrane; in AFD, TAX-4 colocalizes with thermosensory guanylyl cyclases at sensory endings (li2024inhibitionofa pages 8-9, li2024inhibitionofa pages 1-2, inada2006identificationofguanylyl pages 6-7) |
| Gating ligand | Activated preferentially by cGMP; channel has higher affinity for cGMP than cAMP, though cyclic nucleotides gate the channel through the CNBD (inada2006identificationofguanylyl pages 1-2, li2017structureofa pages 1-2, bargmann2006chemosensationinc. pages 10-12) |
| Ion selectivity | Nonselective cation channel permeable to monovalent cations and reported as permeable to Na+ and Ca2+ in sensory signaling; extracellular Ca2+/Mg2+ can block permeation in structural/biophysical analyses (li2017structureofa pages 4-6, li2017structureofa pages 6-8, troemel1999chemosensorysignalingin pages 5-6) |
| Key domains / architecture | Canonical CNG architecture with S1-S6 transmembrane domain, pore loop/selectivity filter, C-linker/gating ring, and cyclic nucleotide-binding domain (CNBD); selectivity filter includes T376-I377-G378-E379 (li2017structureofa pages 27-32, li2017structureofa pages 4-6, li2017structureofa pages 2-4) |
| Structural resolution | Cryo-EM structure solved at 3.5 Å in the cGMP-bound open state (li2017structureofa pages 1-2, li2017structureofa pages 2-4, li2017structureofa pages 14-20) |
| Mutant phenotypes | Loss of tax-4 causes major chemotaxis and thermotaxis defects, altered food-state sensory gene expression, enhanced cold tolerance in specific contexts, ectopic neurite initiation in ASJ, and lifespan extension with intestinal UPRER activation; one study reported mean lifespan increase from 19.02 to 29.95 days in tax-4(p678) mutants, while pharmacologic CNG inhibition extended lifespan by ~18% (31 to 38 days) (okahata2022molecularphysiologyregulating pages 2-4, wexler2020c.elegansmales pages 7-9, li2024inhibitionofa pages 6-7, zallen2000neuronalcellshape pages 5-7, inada2006identificationofguanylyl pages 7-10, li2024inhibitionofa pages 7-8) |
| Key signaling pathways | Core component of cGMP-dependent sensory transduction. In AWC: GPCRs → ODR-3 → ODR-1/DAF-11 guanylyl cyclases or PDE regulation → cGMP → TAX-4/TAX-2 opening. In AFD: GCY-8/GCY-18/GCY-23 receptor guanylyl cyclases act upstream of TAX-4/TAX-2 to drive thermosensation and adaptation (inada2006identificationofguanylyl pages 11-13, inada2006identificationofguanylyl pages 10-11, troemel1999chemosensorysignalingin pages 6-8, bargmann2006chemosensationinc. pages 10-12) |
Table: This table summarizes the core molecular, cellular, structural, and functional properties of the C. elegans TAX-4 cyclic nucleotide-gated channel. It is useful as a compact reference linking TAX-4 identity, localization, signaling pathways, and experimentally observed mutant phenotypes.
TAX-4 functions as the α (CNGA) subunit of a cyclic nucleotide-gated nonselective cation channel that mediates sensory signal transduction in C. elegans. The channel is gated by intracellular cyclic nucleotides, with a markedly higher affinity for cGMP than for cAMP, establishing cGMP as its physiological ligand (inada2006identificationofguanylyl pages 1-2, li2017structureofa pages 1-2). Upon binding cGMP, the channel opens and allows influx of cations—primarily Na⁺ and Ca²⁺—thereby depolarizing the sensory neuron and converting a chemical second messenger signal into an electrical response (troemel1999chemosensorysignalingin pages 5-6, bargmann2006chemosensationinc. pages 10-12). TAX-4 can form functional homomeric channels on its own, but it normally assembles with its partner TAX-2 (β subunit) to form heteromeric channels with enhanced activity (bargmann2006chemosensationinc. pages 10-12).
The three-dimensional structure of TAX-4 was resolved at 3.5 Å by cryo-electron microscopy in the cGMP-bound open state (li2017structureofa pages 1-2, li2017structureofa pages 2-4). TAX-4 assembles as a four-fold symmetric tetramer with a central ion-conducting pore spanning approximately 120 Å. Each protomer contains four structural layers: an extracellular domain, a transmembrane domain (TMD) with six membrane-spanning helices (S1–S6), a pore loop, a C-linker gating ring, and the CNBD (li2017structureofa pages 2-4, li2017structureofa pages 25-27).
A distinctive architectural feature of TAX-4 is its non-domain-swapped arrangement, in which the voltage-sensor-like domain (VSLD, comprising S1–S4) interacts with the pore domain of the same subunit rather than of a neighboring subunit (li2017structureofa pages 6-8, li2017structureofa pages 2-4). Despite retaining a VSLD, TAX-4 is not voltage-gated: the S4 helix is fragmented into three sub-segments with different secondary structures and orientations, which prevents voltage-dependent gating (li2017structureofa pages 2-4).
The selectivity filter is formed by residues T376, I377, G378, and E379, with the narrowest constriction (4.7 Å diameter) at the E379 side chains (li2017structureofa pages 4-6). The filter is relatively wide and electronegative, permitting ions with their hydration shells to pass through, which accounts for the channel's poor selectivity among monovalent cations (li2017structureofa pages 4-6, li2017structureofa pages 6-8). E379 is critical for pH-dependent permeation and divalent cation blocking; extracellular Ca²⁺ and Mg²⁺ block the channel pore under physiological conditions (li2017structureofa pages 4-6, li2017structureofa pages 6-8).
The gating mechanism involves conformational changes in the C-linker helices (A′B′C′D′), which form a compact gating ring upon cGMP binding (li2017structureofa pages 27-32). In the liganded state, strong interactions within the gating ring cause the S6 helices to splay outward, opening the selectivity filter gate. In the unliganded state, these interactions weaken, causing S6 to constrict and close the gate (li2017structureofa pages 27-32). The C-linker is directly coupled to S6 via a two-amino-acid linker, providing the critical mechanical link between cyclic nucleotide binding at the CNBD and channel opening at the pore (li2017structureofa pages 4-6).
TAX-4 is expressed in approximately 12 classes of amphid head sensory neurons. These include ASE (gustatory), AWC (olfactory), AWB (volatile repellent detection), AFD (thermosensory), ASI, ASJ, ASG, and ASK (wexler2020c.elegansmales pages 7-9, bargmann2006chemosensationinc. pages 10-12). TAX-4 is also functionally relevant in additional sensory neurons including BAG and PQR (galande2025rolesofcyclic pages 15-16). Notably, TAX-4 is not expressed in AWA or ASH sensory neurons, which utilize alternative transduction pathways (e.g., the TRPV channel OSM-9) (wexler2020c.elegansmales pages 7-9, bargmann2006chemosensationinc. pages 10-12).
At the subcellular level, TAX-4 localizes to the ciliary membrane of sensory neurons (li2024inhibitionofa pages 1-2, li2024inhibitionofa pages 8-9). In AFD thermosensory neurons, TAX-4 colocalizes at sensory endings with the receptor guanylyl cyclases GCY-8, GCY-18, and GCY-23 that produce its ligand cGMP (inada2006identificationofguanylyl pages 6-7). This ciliary localization is functionally significant: the channel senses and transduces environmental stimuli at the tips of cilia that are exposed (directly or indirectly) to the external environment through the amphid sensory openings. Importantly, loss of tax-4 does not disrupt ciliary structure itself—tax-4 mutants maintain normal ciliary morphology, fluorescence dye uptake, ciliary length, and intraflagellar transport (li2024inhibitionofa pages 7-8).
In AWC olfactory neurons, the canonical signaling cascade proceeds as follows: volatile odorants (e.g., benzaldehyde, butanone) are detected by G protein-coupled receptors (GPCRs) that activate the Gi-like G protein α subunit ODR-3, along with modulatory G proteins GPA-2 and GPA-3 (troemel1999chemosensorysignalingin pages 6-8, bargmann2006chemosensationinc. pages 1-3). ODR-3 regulates intracellular cGMP levels by modulating receptor guanylyl cyclases ODR-1 and DAF-11 (which likely function as heterodimers) or cGMP phosphodiesterases (bargmann2006chemosensationinc. pages 10-12). Elevated cGMP opens the TAX-4/TAX-2 channel, depolarizing the cell and generating the sensory signal (bargmann2006chemosensationinc. pages 10-12). Additional regulatory components include GRK-2 (a G protein-regulated receptor kinase required for AWC chemosensation), ARR-1 (β-arrestin mediating rapid adaptation through receptor internalization), and EGL-4 (a cGMP-dependent protein kinase mediating both short- and long-term odor adaptation) (bargmann2006chemosensationinc. pages 14-15, bargmann2006chemosensationinc. pages 1-3).
In AFD thermosensory neurons, the signaling pathway is more direct. Three receptor-type guanylyl cyclases—GCY-8, GCY-18, and GCY-23—function as thermoreceptors. These transmembrane enzymes, containing extracellular, transmembrane, and intracellular guanylyl cyclase domains, directly convert temperature stimuli into changes in intracellular cGMP concentration (inada2006identificationofguanylyl pages 6-7, inada2006identificationofguanylyl pages 1-2). The cGMP then gates the TAX-4/TAX-2 channel, mediating Ca²⁺ influx that drives thermotactic behavior. All three guanylyl cyclases are expressed exclusively in AFD neurons and function redundantly; triple mutants lacking all three exhibit severe thermotaxis defects comparable to AFD-ablated animals, while chemotaxis remains normal (inada2006identificationofguanylyl pages 6-7, inada2006identificationofguanylyl pages 10-11). Recent work has demonstrated that GCY-18 and GCY-23 drive thermosensory adaptation at distinct temporal rates, with differential phosphorylation/dephosphorylation cycles affecting response thresholds of the TAX-4 channel (hill2024feedforwardandfeedback pages 4-5). Calcium-dependent feedback through guanylyl cyclase-activating proteins (GCAPs) modulates cGMP synthesis, ensuring transient calcium responses (hill2024molecularandneuronal pages 60-64).
Cyclic nucleotide phosphodiesterases (PDEs) are critical regulators of cGMP levels and thereby modulate TAX-4 channel activity. PDEs hydrolyze cGMP to attenuate sensory signals and accelerate recovery to pre-stimulated levels (galande2025rolesofcyclic pages 15-16). The tight regulation of cGMP concentration is essential: both deficient and excessive cGMP levels produce abnormal thermotaxis phenotypes (cryophilic or thermophilic behavior, respectively) (inada2006identificationofguanylyl pages 10-11).
Loss of tax-4 function causes severe defects in chemotaxis to water-soluble attractants (detected by ASE neurons) and volatile odorants (detected by AWC neurons), as well as responses to volatile repellents (detected by AWB neurons) (bargmann2006chemosensationinc. pages 10-12, inada2006identificationofguanylyl pages 10-11).
tax-4 mutants display severely defective thermotaxis, migrating preferentially to cold temperatures regardless of cultivation temperature. When cultivated at 20°C, nearly all tax-4 mutants migrated to the cold region rather than tracking to the cultivation temperature (inada2006identificationofguanylyl pages 7-10, inada2006identificationofguanylyl pages 11-13). Recent work shows that TAX-4 is essential for temperature-evoked calcium dynamics in AFD—mutations in tax-4 largely eliminate temperature-evoked calcium responses in this neuron (hill2024molecularandneuronal pages 60-64).
TAX-4 negatively regulates cold tolerance through its expression in ASJ neurons. Loss-of-function tax-4 mutants exhibit abnormally enhanced cold tolerance, and this phenotype can be rescued specifically by re-expressing wild-type tax-4 in ASJ neurons but not in ASI or AWC neurons (okahata2022molecularphysiologyregulating pages 2-4).
A landmark recent finding (Li et al., 2024) demonstrated that inhibition of the TAX-4 CNG channel on sensory neuron cilia activates the unfolded protein response of the endoplasmic reticulum (UPR^ER) in intestinal cells through the IRE-1/XBP-1 signaling pathway, promoting longevity in a cell nonautonomous manner (li2024inhibitionofa pages 10-11, li2024inhibitionofa pages 8-9, li2024inhibitionofa pages 1-2). The tax-4(p678) mutation extended mean lifespan from 19.02 to 29.95 days, and pharmacological inhibition of CNG channels using ZD7288 extended lifespan by approximately 18% (li2024inhibitionofa pages 6-7, li2024inhibitionofa pages 7-8). TAX-4 mutants also show reduced aggregation of polyglutamine (polyQ) proteins, indicating improved protein quality control (li2024inhibitionofa pages 6-7). This work establishes TAX-4 as a molecular link between ciliary sensory perception and systemic stress response pathways that regulate aging.
tax-4 mutants display altered sensory gene expression programs. In males, loss of tax-4 leads to elevated odr-10 expression and dramatically reduced daf-7 expression in ASI and ASJ neurons, disrupting state-dependent behavioral responses to food (wexler2020c.elegansmales pages 7-9). Additionally, tax-4 mutants exhibit ectopic neurite initiation in ASJ neurons, indicating that the channel participates in activity-dependent pathways that suppress aberrant neurite outgrowth during development (zallen2000neuronalcellshape pages 5-7).
A recent study (Rosero and Bai, 2026) revealed that TAX-4 is essential for AFD-mediated thermosensation but is dispensable for a newly discovered role of AFD in tactile-dependent locomotion modulation, where another CNG channel α subunit, CNG-3, acts instead (rosero2026afdthermosensoryneurons pages 13-14). This functional specialization indicates that different CNG α subunits are recruited for distinct sensory modalities even within the same neuron.
TAX-4 belongs to the CNGA subfamily of cyclic nucleotide-gated channels, which are ancient sensory transduction molecules conserved across metazoans. The cryo-EM structure of TAX-4 was the first high-resolution structure of any eukaryotic CNG channel, providing foundational insights into CNG channel architecture, gating, and ion selectivity that are relevant to understanding mammalian visual and olfactory CNG channels (li2017structureofa pages 1-2, li2017structureofa pages 14-20). Structural comparisons with bovine rod CNGA1/CNGB1 channels and human HCN2 channels have illuminated shared and divergent architectural features, including the non-domain-swapped arrangement and the fragmented S4 segment unique to CNG channels (li2017structureofa pages 2-4). Functionally, the Brugia malayi ortholog of TAX-4 partially rescues sensory defects in C. elegans tax-4 knockout strains, indicating conservation of CNG channel function across nematode species, including parasitic nematodes.
TAX-4 is the α subunit of a cGMP-gated nonselective cation channel localized to the ciliary membrane of sensory neurons in C. elegans. It functions as a critical downstream effector in cGMP-dependent sensory transduction pathways, converting intracellular cGMP fluctuations—generated by upstream guanylyl cyclases and modulated by phosphodiesterases—into cation influx (primarily Na⁺ and Ca²⁺) and neuronal depolarization. Through its expression in distinct subsets of amphid sensory neurons, TAX-4 mediates chemotaxis, olfaction, thermotaxis, and cold tolerance. Beyond sensory transduction, TAX-4 channel activity regulates gene expression programs, neuronal morphology, dauer formation, and organismal lifespan through cell nonautonomous signaling to peripheral tissues. Its high-resolution cryo-EM structure has provided paradigm-defining insights into eukaryotic CNG channel architecture and gating mechanisms.
References
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(rosero2026afdthermosensoryneurons pages 13-14): Manuel Rosero and Jihong Bai. Afd thermosensory neurons mediate tactile-dependent locomotion modulation in c. elegans. Apr 2026. URL: https://doi.org/10.7554/elife.106496, doi:10.7554/elife.106496. This article has 0 citations.