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Comprehensive Research Report: C. elegans PHB-2 (Prohibitin-2)

Gene Identity and Overview

The gene phb-2 (ORF name T24H7.1) in Caenorhabditis elegans encodes Mitochondrial Prohibitin Complex Protein 2 (Prohibitin-2), a highly conserved inner mitochondrial membrane (IMM) scaffold protein (UniProt: P50093). PHB-2 belongs to the prohibitin family and contains a characteristic Band 7/SPFH domain (IPR001107) and a prohibitin domain (IPR000163). Together with its obligate partner PHB-1, PHB-2 assembles into a large, multimeric prohibitin (PHB) complex that is essential for mitochondrial homeostasis, development, and organismal longevity. PHB-2 is not an enzyme; rather, it functions as a structural scaffold and membrane organizer with an additional, experimentally validated role as a mitophagy receptor.

1. Protein Structure and the Prohibitin Complex

Domain Architecture

PHB-2 is a 34 kDa protein containing an N-terminal transmembrane domain that anchors it to the IMM, a conserved PHB/Band 7 domain (common to scaffold proteins such as stomatin and flotillin), and a C-terminal coiled-coil domain that mediates heterodimeric interaction with PHB-1 (hernandorodriguez2018mitochondrialqualitycontrol pages 8-10, artalsanz2009prohibitinandmitochondrial pages 1-2). The N-terminal transmembrane helix (predicted at approximately positions 37–59 based on yeast orthologue data) positions a short segment in the mitochondrial matrix, while the bulk of the protein, including the PHB domain and coiled-coil region, projects into the intermembrane space (artalsanz2009prohibitinandmitochondrial pages 1-2).

Ring/Bell-Shaped Complex

PHB-1 and PHB-2 are mutually dependent: depletion of either subunit leads to loss of the entire complex (artalsanz2009prohibitinandmitochondrial pages 1-2). Historically, biochemical studies indicated that approximately 12–16 PHB-1/PHB-2 heterodimers assemble into a ring-like macromolecular structure of ~1 MDa with a diameter of 20–25 nm at the IMM (artalsanz2009prohibitinandmitochondrial pages 1-2). A landmark 2025 study by Lange et al. using cryo-electron tomography (cryo-ET) and subtomogram averaging determined the in situ architecture of the human prohibitin complex at 16.3 Å resolution, revealing a bell-shaped structure composed of 11 alternating PHB1 and PHB2 molecules (either 6:5 or 5:6 stoichiometry), with a diameter of ~190 Å and height of ~84 Å (lange2025insituarchitecture pages 1-2, lange2025insituarchitecture pages 4-7). The bell's top is stabilized by coiled-coil domains with alternating charged residues providing strong electrostatic interactions (lange2025insituarchitecture pages 4-7). Quantitative analysis revealed approximately 43 prohibitin complexes per crista, collectively covering 1–3% of the cristae membrane area (lange2025insituarchitecture pages 1-2, lange2025insituarchitecture pages 7-8). Given the extreme conservation of prohibitins, this architecture is expected to be conserved in C. elegans.

2. Subcellular Localization

PHB-2 is primarily localized to the mitochondrial inner membrane, where it resides within cristae membranes as part of the PHB complex (lange2025insituarchitecture pages 3-4, hernandorodriguez2018mitochondrialqualitycontrol pages 8-10). The complex projects from the IMM into the intermembrane space, forming a scaffold at the cristae. In physiological contexts involving outer mitochondrial membrane rupture (e.g., during paternal mitochondria degradation after fertilization), PHB-2 becomes exposed to the cytoplasm, enabling its secondary function as a mitophagy receptor (wei2017prohibitin2is pages 13-14, wei2017prohibitin2is pages 1-3).

3. Primary Molecular Functions

3.1 Membrane Scaffold and Organizer

The primary function of PHB-2, acting within the PHB complex, is as an inner mitochondrial membrane scaffold that organizes membrane lipids and proteins. The complex acts as a membrane organizer affecting the distribution of mitochondrial membrane lipids, particularly cardiolipin and phosphatidylethanolamine (lourenco2021themitochondrialprohibitin pages 3-5, hernandorodriguez2018mitochondrialqualitycontrol pages 8-10). It stabilizes newly synthesized mitochondrial-encoded electron transport chain (ETC) subunits through proposed holdase-unfoldase chaperone activity, protecting hydrophobic membrane proteins until they can be properly assembled with their nuclear-encoded partners (hernandorodriguez2018mitochondrialqualitycontrol pages 8-10, artalsanz2009prohibitinandmitochondrial pages 3-4). The PHB complex also interacts functionally with the m-AAA protease, which degrades unassembled or damaged membrane proteins; PHB appears to shield substrates from premature proteolysis (artalsanz2009prohibitinandmitochondrial pages 2-3, hernandorodriguez2018mitochondrialqualitycontrol pages 8-10).

3.2 Cristae Morphogenesis

PHB-2 is essential for maintaining mitochondrial cristae architecture. The complex stabilizes OPA1 (a GTPase critical for mitochondrial inner membrane fusion and cristae remodeling), thereby regulating cristae junction integrity and keeping cristae membranes in close proximity (wei2017prohibitin2is pages 12-13, artalsanz2009prohibitinandmitochondrial pages 3-4). PHB-2 increases apoptosis resistance by stabilizing OPA1, which controls mitochondrial cristae remodeling and fusion (qi2023essentialproteinphb2 pages 5-6). Loss of PHB in C. elegans causes severe mitochondrial fragmentation (hernandorodriguez2018mitochondrialqualitycontrol pages 8-10).

3.3 Mitochondrial Nucleoid Organization

The PHB complex participates in organizing mitochondrial nucleoids—the structures that package and maintain mitochondrial DNA (hernandorodriguez2018mitochondrialqualitycontrol pages 8-10).

3.4 Mitophagy Receptor

A seminal 2017 study by Wei et al. in Cell identified PHB2 as the first inner mitochondrial membrane mitophagy receptor (wei2017prohibitin2is pages 1-3, wei2017prohibitin2is pages 13-14). PHB-2 contains an LC3-interacting region (LIR) domain through which it directly binds LC3-II (and its C. elegans orthologues LGG-1 and LGG-2) to recruit autophagic machinery for selective mitochondrial degradation (wei2017prohibitin2is pages 13-14, wei2017prohibitin2is pages 12-13). This interaction becomes possible when the outer mitochondrial membrane is ruptured (via proteasome-dependent degradation), exposing the IMM-resident PHB-2 to cytoplasmic autophagy components (wei2017prohibitin2is pages 1-3). In C. elegans, this function is critically important for the elimination of paternal mitochondria after fertilization, thereby ensuring maternal mitochondrial inheritance. RNAi knockdown of phb-2 in males results in delayed paternal mitochondrial clearance and persistence of paternal mtDNA in embryos and subsequent generations (wei2017prohibitin2is pages 13-14, lahiri2017phb2prohibitin2an pages 2-2, choubey2021molecularmechanismsand pages 19-20). Notably, PHB-2-mediated paternal mitophagy in C. elegans appears to be Parkin-independent, distinguishing it from the canonical PINK1-Parkin pathway (wei2017prohibitin2is pages 1-3). In mammalian cells, PHB2 also promotes PINK1-PRKN/Parkin-dependent mitophagy through the PARL-PGAM5-PINK1 axis, where PHB2 negatively regulates the protease PARL to stabilize PINK1 on the outer mitochondrial membrane (qi2023essentialproteinphb2 pages 5-6, choubey2021molecularmechanismsand pages 19-20).

4. Biological Processes and Signaling Pathways

4.1 Development and Reproduction

Prohibitins are required for embryonic development in C. elegans. Postembryonic depletion of PHB by RNAi causes severe germline defects, indicating an essential role in cell proliferation (hernandorodriguez2018mitochondrialqualitycontrol pages 8-10, artalsanz2009prohibitinandmitochondrial pages 2-3).

4.2 Mitochondrial Unfolded Protein Response (UPR^mt)

PHB depletion strongly induces the UPR^mt in C. elegans, a retrograde stress signaling pathway from mitochondria to nucleus that activates transcriptional programs to restore mitochondrial proteostasis (hernandorodriguez2018mitochondrialqualitycontrol pages 1-3, fernandezabascal2023twoconservedtranscription pages 1-4). The UPR^mt induction upon PHB depletion is mediated fully by the transcription factor ATFS-1 and partially by DVE-1 (fernandezabascal2023twoconservedtranscription pages 11-13, fernandezabascal2023twoconservedtranscription pages 4-7). Recent genome-wide screening identified two additional conserved transcription factors, ZNF-622 and TLF-1, as specific regulators of the PHB-mediated mitochondrial stress response, along with the histone deubiquitinase USP-48 as a strong differential modulator (fernandezabascal2023twoconservedtranscription pages 4-7, fernandezabascal2023twoconservedtranscription pages 7-9). Importantly, the strength of UPR^mt induction differs depending on the metabolic/genetic context: it is robust in wild-type animals upon PHB depletion but attenuated in daf-2 insulin receptor mutants (fernandezabascal2023twoconservedtranscription pages 11-13, fernandezabascal*2023twoconservedtranscription pages 1-4).

4.3 Aging and Lifespan Regulation

The PHB complex is a context-dependent modulator of longevity in C. elegans, exhibiting a remarkable and paradoxical effect on lifespan (lourenco2021themitochondrialprohibitin pages 1-2, hernandorodriguez2018mitochondrialqualitycontrol pages 1-3):

• In wild-type animals, PHB-1 or PHB-2 depletion shortens lifespan, consistent with impaired mitochondrial function (belser2021roleofprohibitins pages 2-3, hernandorodriguez2018mitochondrialqualitycontrol pages 10-12).
• In metabolically compromised mutants, PHB depletion dramatically extends lifespan — up to 150% longer in daf-2 (insulin/IGF-1 receptor) mutants, and similarly in ETC mutants, dietary restriction mutants, and fat metabolism mutants (belser2021roleofprohibitins pages 2-3, hernandorodriguez2018mitochondrialqualitycontrol pages 1-3).

This differential effect involves the insulin/IGF-1 signaling (IIS) pathway. In daf-2 mutants, PHB depletion extends lifespan while attenuating the UPR^mt, and this lifespan extension requires a functional UPR^mt response and ATFS-1 (fernandezabascal2023twoconservedtranscription pages 11-13, fernandezabascal2023twoconservedtranscription pages 4-7). The transcription factors ZNF-622 and TLF-1 show much greater lifespan impact in daf-2 backgrounds (38–58% reduction) than in wild-type (4–16% reduction), confirming the insulin signaling-dependent nature of PHB-mediated longevity (fernandezabascal*2023twoconservedtranscription pages 7-9).

PHB depletion also extends lifespan in TORC2/SGK-1 mutants through autophagy and UPR^mt activation. In sgk-1 mutants, PHB depletion suppresses impaired mitochondrial homeostasis, lipogenesis, and yolk formation defects, and the lifespan extension requires both UPR^mt and autophagy but not mitophagy (fernandezabascal*2023twoconservedtranscription pages 18-21, lourenco2021themitochondrialprohibitin pages 7-8).

4.4 Lipid and Metabolic Regulation

PHB-2 and the PHB complex profoundly influence lipid metabolism and the C. elegans metabolome (lourenco2021themitochondrialprohibitin pages 1-2, lourenco2021themitochondrialprohibitin pages 3-5):

• Lipid composition: PHB depletion significantly alters the lipidome, increasing glycerolipid and triacylglyceride (TAG) pools, with preferential effects on longer-chain, less unsaturated TAG species. Sphingomyelin and ceramide pools decrease, as do phosphatidylcholine and phosphatidylethanolamine levels (lourenco2021themitochondrialprohibitin pages 2-3, lourenco2021themitochondrialprohibitin pages 3-5).
• Fat storage: PHB depletion increases lipid droplet intestinal coverage and accommodates excess TAGs in larger intestinal lipid droplets; these can be mobilized during aging through ATGL-1 regulation (lourenco2021themitochondrialprohibitin pages 7-8).
• Mitochondrial membrane lipids: The complex affects mitochondrial cardiolipin and phosphatidylethanolamine distribution, which are critical for respiratory chain function and membrane integrity (lourenco2021themitochondrialprohibitin pages 3-5).
• Broader metabolism: PHB depletion alters amino acid levels (branched-chain amino acids, alanine), TCA cycle intermediates (reduced succinate), increases trehalose accumulation (a stress protectant), and shifts metabolism toward the glyoxylate cycle in daf-2 backgrounds (lourenco2021themitochondrialprohibitin pages 5-7).

These metabolic effects are insulin signaling-dependent, with differential impacts between wild-type and daf-2 mutant animals. The biochemical data collectively support the model that PHB modulates longevity through moderation of fat utilization and energy production via the mitochondrial respiratory chain (lourenco2021themitochondrialprohibitin pages 1-2).

4.5 Interaction with OXPHOS and Respiratory Chain

PHB-2 interacts with the sphingosine-1-phosphate (S1P) pathway, supporting proper assembly of respiratory complex IV and cytochrome c oxidase activity (lourenco2021themitochondrialprohibitin pages 12-13). PHB depletion leads to impaired respiratory supercomplex formation and activation of mitochondrial flashes, indicative of compromised bioenergetics (lourenco2021themitochondrialprohibitin pages 12-13).

5. Summary of Key Functions

The following table summarizes the experimentally supported and inferred functions of C. elegans PHB-2:

Table: This table summarizes the main experimentally supported and inferred functions of C. elegans PHB-2, emphasizing its mitochondrial scaffold role, mitophagy receptor function, and links to stress responses, metabolism, and aging. It is useful as a compact reference for the gene’s core biological annotation.

6. Conclusions

C. elegans PHB-2 is a multifunctional inner mitochondrial membrane protein whose primary role is as a structural scaffold within the prohibitin complex, organizing membrane lipids and stabilizing respiratory chain components and cristae architecture. Its secondary, experimentally well-validated function as a mitophagy receptor — binding LGG-1/LC3 via its LIR domain upon outer membrane rupture — is essential for paternal mitochondrial elimination and maternal mitochondrial DNA inheritance. Beyond these molecular activities, PHB-2 operates at the nexus of mitochondrial stress signaling (UPR^mt), insulin/IGF-1 signaling, mTORC2/SGK-1 pathways, and lipid metabolism to modulate organismal aging in a context-dependent manner. The recent determination of the bell-shaped 11-subunit in situ architecture of the homologous human prohibitin complex by cryo-ET (lange2025insituarchitecture pages 1-2, lange2025insituarchitecture pages 4-7) provides a structural foundation for understanding how this conserved scaffold contributes to the spatial organization and functional integrity of the mitochondrial inner membrane.

References

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Artifacts

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Citations

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