The research report should be a detailed narrative explaining the function, biological processes, and localization of the gene product. Citations should be given for all claims.
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We are interested in where in or outside the cell the gene product carries out its function.
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The gene PAS2 (PASTICCINO2, also known as PEPINO/PEP) corresponds to Arabidopsis thaliana locus At5g10480 (UniProt Q8VZB2). This gene encodes a very-long-chain (3R)-3-hydroxyacyl-CoA dehydratase (EC 4.2.1.134), belonging to the HACD (hydroxyacyl-CoA dehydratase) protein family (bach2008theverylongchainhydroxy pages 1-2). The protein contains a protein-tyrosine-phosphatase-like (PTPLA) domain, but its primary experimentally validated function is dehydratase activity rather than phosphatase activity (bach2008theverylongchainhydroxy pages 4-5, zhu2020disruptionofverylongchainfatty pages 3-5). All primary literature sources consistently identify this protein as the 3-hydroxyacyl-CoA dehydratase component of the very-long-chain fatty acid (VLCFA) elongation machinery, confirming this is the correct gene matching the provided UniProt annotation.
PAS2 catalyzes the dehydration of (3R)-3-hydroxyacyl-CoA intermediates to produce trans-2-enoyl-CoA and water, corresponding to the third enzymatic step in the VLCFA elongation cycle (bach2008theverylongchainhydroxy pages 1-2, bach2008theverylongchainhydroxy pages 2-3, roudier2010verylongchainfattyacids pages 1-2). The enzymatic activity is mediated by conserved catalytic residues Tyr156 and Glu163 within the dehydratase domain (zhu2020disruptionofverylongchainfatty pages 3-5). This reaction is essential and rate-limiting for VLCFA biosynthesis in Arabidopsis (bach2008theverylongchainhydroxy pages 1-2, bach2008theverylongchainhydroxy pages 4-5).
The substrates of PAS2 are 3-hydroxyacyl-CoA intermediates generated during VLCFA elongation, not free fatty acids (bach2008theverylongchainhydroxy pages 1-2, bach2008theverylongchainhydroxy pages 3-4). Direct biochemical evidence from pas2 mutants demonstrates accumulation of 3-hydroxy-C18:0-CoA, 3-hydroxy-C20:0-CoA, and 3-hydroxy-C22:0-CoA species, confirming these as natural substrates (bach2008theverylongchainhydroxy pages 3-4, bach2008theverylongchainhydroxy pages 2-3). The enzyme exhibits broad substrate specificity across long-chain and very-long-chain 3-hydroxyacyl-CoA intermediates, though the precise kinetic preferences for specific chain lengths have not been fully defined (bach2008theverylongchainhydroxy pages 2-3). Chain-length selectivity in VLCFA biosynthesis is primarily determined by the associated KCS (3-ketoacyl-CoA synthase) enzyme in each elongase complex rather than by PAS2 itself (morineau2016dualfattyacid pages 11-12, morineau2016dualfattyacid pages 6-8).
| Step number | Enzyme type | Arabidopsis gene or protein | Substrate | Product | Notes |
|---|---|---|---|---|---|
| 1 | 3-ketoacyl-CoA synthase (KCS; condensing enzyme) | Multiple KCS isoforms; PAS2-associated proteins include KCS1, KCS5, KCS6, KCS8, KCS9, KCS10, and KCS18 | Acyl-CoA and malonyl-CoA | 3-ketoacyl-CoA, CO₂, and CoA | Initiates each elongation cycle and largely determines chain-length specificity. PAS2 interacts with several KCS isoforms. (batsale2021biosynthesisandfunctions pages 3-5, morineau2016dualfattyacid pages 6-8) |
| 2 | 3-ketoacyl-CoA reductase (KCR) | KCR1, the principal functional isoform | 3-ketoacyl-CoA, NADPH, and H⁺ | (3R)-3-hydroxyacyl-CoA and NADP⁺ | Performs the first reduction and generates the direct substrate of PAS2. KCR and PAS2 associate in the ER elongase machinery. (batsale2021biosynthesisandfunctions pages 3-5, roudier2010verylongchainfattyacids pages 3-4) |
| 3 | Very-long-chain (3R)-3-hydroxyacyl-CoA dehydratase (HACD or HCD) | PAS2, PASTICCINO2, or PEP; At5g10480; UniProt Q8VZB2 | (3R)-3-hydroxyacyl-CoA | trans-2-enoyl-CoA and H₂O | PAS2 is the third core enzyme. pas2 mutants accumulate 3-hydroxy-C18:0-, C20:0-, and C22:0-CoA intermediates; a sharply defined intrinsic chain-length preference remains unestablished. (bach2008theverylongchainhydroxy pages 1-2, bach2008theverylongchainhydroxy pages 3-4, bach2008theverylongchainhydroxy pages 2-3) |
| 4 | trans-2,3-enoyl-CoA reductase (ECR) | CER10 or ECR | trans-2-enoyl-CoA, NADPH, and H⁺ | Acyl-CoA extended by two carbons and NADP⁺ | Completes one elongation round. CER10 physically interacts with PAS2 in the ER, and the elongated acyl-CoA can re-enter the cycle. (bach2008theverylongchainhydroxy pages 1-2, bach2008theverylongchainhydroxy pages 3-4) |
Table: The four reactions of the ER-associated fatty-acid elongase cycle, highlighting PAS2 as the third-step dehydratase. Each completed cycle extends an acyl-CoA chain by two carbons.
The VLCFA elongation cycle consists of four sequential enzymatic reactions that extend fatty acyl chains by two carbon units per cycle (bach2008theverylongchainhydroxy pages 1-2, batsale2021biosynthesisandfunctions pages 3-5, morineau2016dualfattyacid pages 1-2). PAS2 functions as the third-step enzyme, receiving 3-hydroxyacyl-CoA from the ketoacyl-CoA reductase (KCR1) and producing trans-2-enoyl-CoA that is subsequently reduced by the enoyl-CoA reductase CER10/ECR to complete the elongation cycle (bach2008theverylongchainhydroxy pages 1-2, bach2008theverylongchainhydroxy pages 3-4).
PAS2 is primarily localized to the endoplasmic reticulum (ER) membrane, where it functions as part of the ER-bound fatty acid elongase complex (bach2008theverylongchainhydroxy pages 2-2, morineau2016dualfattyacid pages 6-8, bach2011verylongchainfattyacids pages 1-3). This ER localization is consistent with its role in the microsomal VLCFA elongation pathway and has been confirmed through multiple experimental approaches including fluorescent protein tagging and biochemical fractionation studies.
Recent evidence from Zhu et al. (2020) reports that native-promoter-driven GFP-PAS2 fusions also localize to the Golgi apparatus in Arabidopsis dark-grown hypocotyl cells, with over 90% colocalization with Golgi markers (zhu2020disruptionofverylongchainfatty pages 8-11, zhu2020disruptionofverylongchainfatty pages 13-15). This Golgi localization is associated with cellulose synthase complexes (CSCs) at the Golgi, suggesting a potential additional role for PAS2 beyond its established ER elongase function (zhu2020disruptionofverylongchainfatty pages 3-5, zhu2020disruptionofverylongchainfatty pages 13-15). However, the authors note that different GFP-fusion constructs produced variable localization patterns, and further work is needed to establish whether native untagged PAS2 genuinely localizes to the Golgi in vivo (zhu2020disruptionofverylongchainfatty pages 11-13).
PAS2 operates within the endoplasmic reticulum-localized fatty acid elongase (FAE) complex, which synthesizes VLCFAs through iterative two-carbon extensions of C16 and C18 fatty acyl-CoA precursors (bach2008theverylongchainhydroxy pages 1-2, batsale2021biosynthesisandfunctions pages 3-5, morineau2016dualfattyacid pages 1-2). The elongase complex is a multiprotein assembly consisting of four core enzymatic activities: KCS (condensation), KCR (first reduction), PAS2/HCD (dehydration), and ECR (second reduction) (batsale2021biosynthesisandfunctions pages 3-5, morineau2016dualfattyacid pages 1-2). PAS2 physically interacts with other elongase components, particularly the enoyl-CoA reductase CER10/ECR, as demonstrated by bimolecular fluorescence complementation assays in the ER (bach2008theverylongchainhydroxy pages 3-4, bach2008theverylongchainhydroxy pages 1-2). Additionally, PAS2 associates with multiple KCS isoforms including KCS1, KCS5, KCS6, KCS8, KCS9, KCS10, and KCS18, indicating participation in multiple elongase complexes with different substrate specificities (morineau2016dualfattyacid pages 6-8, roudier2010verylongchainfattyacids pages 3-4).
VLCFAs produced through PAS2-dependent elongation are incorporated into multiple lipid classes serving diverse biological functions (batsale2021biosynthesisandfunctions pages 3-5):
Sphingolipids: VLCFAs are incorporated as N-acyl chains in ceramides, glucosylceramides (GlcCers), and glycosyl inositol phosphoceramides (GIPCs), with VLCFAs constituting nearly 80% of sphingolipid fatty acids in plants (bach2008theverylongchainhydroxy pages 2-3, batsale2021biosynthesisandfunctions pages 13-14, bach2008theverylongchainhydroxy pages 2-2). In pas2 mutants, glucosylceramides show an almost complete loss of VLCFAs, while GIPCs are less severely affected (bach2008theverylongchainhydroxy pages 2-3).
Cuticular waxes: VLCFAs and their derivatives (primary alcohols, alkanes, aldehydes, ketones, secondary alcohols, and wax esters) form the major components of epicuticular and cuticular waxes that provide the plant surface barrier (bach2008theverylongchainhydroxy pages 2-3, bach2008theverylongchainhydroxy pages 3-4, batsale2021biosynthesisandfunctions pages 9-10).
Suberin: Omega-hydroxy VLCFAs, alpha,omega-dicarboxylic acids, and VLCFA-derived alcohols are incorporated into suberin polymers in root endodermis and other barrier tissues (batsale2021biosynthesisandfunctions pages 9-10, batsale2021biosynthesisandfunctions pages 13-14, batsale2021biosynthesisandfunctions pages 6-9).
Storage lipids: VLCFAs are present in seed triacylglycerols (TAGs), particularly C20 and C22 monounsaturated fatty acids (batsale2021biosynthesisandfunctions pages 3-5, roudier2010verylongchainfattyacids pages 1-2, batsale2021biosynthesisandfunctions pages 9-10).
Membrane phospholipids: VLCFAs occur in phosphatidylethanolamine and phosphatidylserine, where they influence membrane properties critical for cellular processes (bach2011verylongchainfattyacids pages 3-3, bach2011verylongchainfattyacids pages 9-11).
PAS2-dependent VLCFAs play an essential role in cytokinesis and cell plate formation during plant cell division (bach2011verylongchainfattyacids pages 7-8, bach2011verylongchainfattyacids pages 8-9, bach2011verylongchainfattyacids pages 1-3). The pas2-1 mutant shows delayed and defective cell plate expansion, with wild-type cell plates completing in 30-40 minutes compared to more than 120 minutes in the mutant (bach2011verylongchainfattyacids pages 3-4). The cellular defects include abnormal localization of cell plate markers (KNOLLE, RabA2a), delayed endocytosis (20 minutes in pas2-1 versus 5 minutes in wild type), and altered membrane fusion and trafficking during cell plate maturation (bach2011verylongchainfattyacids pages 7-8, bach2011verylongchainfattyacids pages 4-7). These defects result from reduced VLCFA content in phosphatidylethanolamine and phosphatidylserine pools, which are critical for maintaining appropriate membrane properties during vesicle fusion and cell plate expansion (bach2011verylongchainfattyacids pages 3-3, bach2011verylongchainfattyacids pages 9-11).
VLCFA biosynthesis through PAS2 and related elongase components influences polar auxin transport and developmental patterning (roudier2010verylongchainfattyacids pages 1-2, roudier2010verylongchainfattyacids pages 7-8). VLCFA-containing sphingolipids define a cargo-selective secretory pathway required for proper plasma membrane targeting of the PIN1 auxin efflux carrier (markham2011sphingolipidscontainingverylongchain pages 5-7, markham2011sphingolipidscontainingverylongchain pages 10-12). In VLCFA-deficient mutants, PIN1 accumulates in intracellular aggregates rather than localizing correctly to the plasma membrane, disrupting polar auxin distribution and causing defects in embryo patterning, cotyledon formation, and lateral root development (roudier2010verylongchainfattyacids pages 4-6, roudier2010verylongchainfattyacids pages 7-8, roudier2010verylongchainfattyacids pages 6-7). Exogenous application of VLCFAs (C20:0, C22:0, C24:0) can rescue lateral root formation and restore normal PIN1 localization in VLCFA-deficient mutants, demonstrating a direct causal relationship (roudier2010verylongchainfattyacids pages 7-8, roudier2010verylongchainfattyacids pages 6-7).
Recent evidence suggests PAS2 influences cellulose biosynthesis through both VLCFA-dependent membrane effects and potential direct interactions with cellulose synthase complexes (zhu2020disruptionofverylongchainfatty pages 3-5, zhu2020disruptionofverylongchainfatty pages 11-13). The pas2-1 mutant shows approximately 22% reduction in crystalline cellulose content in both dark-grown hypocotyls and light-grown roots (zhu2020disruptionofverylongchainfatty pages 3-5). Cellulose synthase complex (CSC) dynamics are severely impaired, with plasma membrane CSC velocity reduced from 376.36 ± 55.35 nm/min in wild type to 123.35 ± 79.89 nm/min in pas2-1, and CSC delivery rate decreasing from 10.88 ± 0.88 to 4.35 ± 1.11 particles/µm²/h (zhu2020disruptionofverylongchainfatty pages 3-5). The mechanism may involve altered VLCFA-containing membrane lipids affecting CSC trafficking and/or a proposed PAS2 association with Golgi-localized CSCs (zhu2020disruptionofverylongchainfatty pages 3-5, zhu2020disruptionofverylongchainfatty pages 11-13).
PAS2 exhibits tissue-specific and developmentally regulated expression patterns (nobusawa2013synthesisofverylongchain pages 9-11, zhu2020disruptionofverylongchainfatty pages 11-13, zhu2020disruptionofverylongchainfatty pages 3-5). The gene is strongly expressed in epidermal (L1 layer) cells, consistent with an L1-box regulatory element in its promoter that is bound by the epidermis-specific transcription factors ATML1 and PDF2 (nobusawa2013synthesisofverylongchain pages 9-11). In roots, PAS2 expression is enriched in the endodermis, correlating with the importance of VLCFAs for suberin biosynthesis in this barrier tissue (morineau2016dualfattyacid pages 11-12). PAS2 is also detected in seedlings, leaves, stems, and flowers, indicating broad but regulated expression throughout plant development (zhu2020disruptionofverylongchainfatty pages 3-5).
| Phenotypic category | Specific defects observed | Molecular/cellular basis | Key supporting references |
|---|---|---|---|
| Embryogenesis and viability | Strong loss-of-function alleles cause embryonic arrest and lethality; partial-loss alleles survive with severe developmental abnormalities. | PAS2 is an essential, limiting component of very-long-chain fatty-acid (VLCFA) synthesis; severe loss prevents production of VLCFA-containing lipids required during embryogenesis. | Bach et al., 2008 (bach2008theverylongchainhydroxy pages 1-2); Roudier et al., 2010 (roudier2010verylongchainfattyacids pages 1-2) |
| Seedling and organ morphology | Dwarf seedlings; short, thick hypocotyls; fused or misshapen leaves; postgenital organ fusion; abnormal differentiation. | Reduced VLCFAs impair cuticle formation, membrane-lipid composition, cell differentiation, and coordinated tissue patterning. | Bach et al., 2008 (bach2008theverylongchainhydroxy pages 2-2, bach2008theverylongchainhydroxy pages 2-3); Roudier et al., 2010 (roudier2010verylongchainfattyacids pages 2-3) |
| Root growth | Five-day-old pas2-1 roots reach about half the wild-type length; root division and elongation zones are shortened. | Defective membrane dynamics, cytokinesis, cellulose synthesis, and cell elongation collectively restrict root growth. | Bach et al., 2011 (bach2011verylongchainfattyacids pages 3-3); Zhu et al., 2020 (zhu2020disruptionofverylongchainfatty pages 3-5) |
| Cell proliferation and meristem activity | Ectopic or excessive cell division; increased mitotic-marker expression; enlarged shoot apical meristem; enhanced callus-like growth and cytokinin sensitivity. | PAS2-dependent VLCFAs normally help coordinate cell-cycle progression and restrain inappropriate proliferation; the precise signaling mechanism remains incompletely defined. | Roudier et al., 2010 (roudier2010verylongchainfattyacids pages 2-3); Bach et al., 2008 (bach2008theverylongchainhydroxy pages 2-2) |
| Cytokinesis and cell-plate maturation | Accumulation of cells in late mitosis; delayed, wavy, fragmented, collapsing, or incomplete cell plates; abnormal KNOLLE and RabA2a localization. Wild-type plates approach completion in 30–40 min, whereas mutant plates can require more than 120 min. | Loss of VLCFA-containing phosphatidylethanolamine, phosphatidylserine, and other membrane lipids impairs membrane fusion, endocytosis, recycling, and expansion of the cell plate after its initial establishment. | Bach et al., 2011 (bach2011verylongchainfattyacids pages 7-8, bach2011verylongchainfattyacids pages 8-9, bach2011verylongchainfattyacids pages 9-11, bach2011verylongchainfattyacids pages 3-4) |
| Endomembrane trafficking | Delayed endocytosis—approximately 20 min in pas2-1 versus 5 min in wild type—and altered brefeldin-A responses; abnormal membrane and endosomal aggregates. | Altered VLCFA-dependent membrane composition disrupts selected endosomal and recycling processes rather than causing a complete block of secretion. | Bach et al., 2011 (bach2011verylongchainfattyacids pages 8-9, bach2011verylongchainfattyacids pages 7-8, bach2011verylongchainfattyacids pages 4-7) |
| Cell elongation and cellulose synthesis | Extremely short etiolated hypocotyls and shorter light-grown roots; crystalline cellulose reduced by approximately 22% in both examined systems. | PAS2 deficiency alters VLCFA metabolism and cellulose-synthase-complex behavior, compromising cell-wall deposition and elongation. | Zhu et al., 2020 (zhu2020disruptionofverylongchainfatty pages 3-5, zhu2020disruptionofverylongchainfatty pages 8-11) |
| Cellulose-synthase dynamics | Plasma-membrane cellulose synthase complexes move at 123.35 ± 79.89 nm/min in pas2-1, versus 376.36 ± 55.35 nm/min in wild type; delivery falls from 10.88 ± 0.88 to 4.35 ± 1.11 particles/µm²/h. | Defective Golgi behavior and reduced delivery or motility of cellulose synthase complexes likely reflect both altered membrane lipids and a proposed PAS2 association with Golgi-localized cellulose synthases. | Zhu et al., 2020 (zhu2020disruptionofverylongchainfatty pages 3-5) |
| Cuticle and epicuticular wax | Reduced stem and leaf wax loads; fewer wax crystals with abnormal, predominantly globular morphology; organ fusion consistent with defective surface barriers. | PAS2-dependent VLC acyl-CoAs supply fatty acids and derivatives used to form cuticular waxes. | Bach et al., 2008 (bach2008theverylongchainhydroxy pages 3-4, bach2008theverylongchainhydroxy pages 2-2) |
| VLCFA metabolism | Global VLCFA depletion and accumulation of the blocked 3-hydroxyacyl-CoA intermediates, including C18:0, C20:0, and C22:0 species. | Loss of PAS2 blocks the third elongation-cycle reaction: dehydration of 3-hydroxyacyl-CoA to trans-2-enoyl-CoA. | Bach et al., 2008 (bach2008theverylongchainhydroxy pages 3-4, bach2008theverylongchainhydroxy pages 2-3) |
| Sphingolipid homeostasis | VLCFAs are almost absent from mutant glucosylceramides; GIPC VLCFAs decline more modestly; 16:0 ceramide, hydroxyceramide, and free long-chain bases accumulate. | Inadequate VLCFA elongation shifts ceramide acyl-chain composition and selectively disrupts complex sphingolipid pools. | Bach et al., 2008 (bach2008theverylongchainhydroxy pages 2-2, bach2008theverylongchainhydroxy pages 2-3) |
| Auxin transport and developmental patterning | VLCFA-pathway mutants show abnormal embryo and root patterning, defective lateral-root development, disturbed auxin distribution, and intracellular aggregation or mistargeting of PIN1. | Reduced VLCFA-containing sphingolipids impair a cargo-selective secretory pathway needed for polar plasma-membrane targeting of auxin carriers; PAS2 is implicated through its core role in VLCFA synthesis, although much direct trafficking evidence comes from other VLCFA-pathway mutants. | Roudier et al., 2010 (roudier2010verylongchainfattyacids pages 1-2, roudier2010verylongchainfattyacids pages 7-8); Markham et al., 2011 (markham2011sphingolipidscontainingverylongchain pages 5-7, markham2011sphingolipidscontainingverylongchain pages 10-12) |
Table: This table organizes experimentally observed pas2 phenotypes across developmental, cellular, and biochemical categories. It connects each defect to its likely VLCFA-dependent mechanism and cites the supporting evidence.
The developmental consequences of PAS2 loss reveal the biological importance of VLCFA biosynthesis for multiple aspects of plant development:
Complete loss of PAS2 function causes embryonic lethality, demonstrating that VLCFA biosynthesis is absolutely essential for plant development (roudier2010verylongchainfattyacids pages 1-2). Partial loss-of-function alleles survive but display severe developmental abnormalities throughout the life cycle (roudier2010verylongchainfattyacids pages 2-3, bach2008theverylongchainhydroxy pages 2-3).
pas2 mutants produce dwarf seedlings with characteristic morphological defects including short, thick hypocotyls; fused or misshapen leaves; and postgenital organ fusion consistent with defective cuticle formation (bach2008theverylongchainhydroxy pages 2-2, roudier2010verylongchainfattyacids pages 2-3, bach2008theverylongchainhydroxy pages 2-3). Root growth is severely impaired, with five-day-old pas2-1 roots reaching only about half the wild-type length (bach2011verylongchainfattyacids pages 3-3). These growth defects reflect underlying cellular abnormalities in cell division, elongation, and differentiation.
pas2 mutants show ectopic cell division, increased expression of mitotic markers, enlarged shoot apical meristems, and enhanced cytokinin sensitivity leading to callus-like growth (bach2008theverylongchainhydroxy pages 2-2, roudier2010verylongchainfattyacids pages 2-3). This indicates that PAS2-dependent VLCFA synthesis normally helps coordinate cell cycle progression and restrict inappropriate proliferation, though the precise signaling mechanism remains incompletely understood.
Reduced cuticular wax loads and altered wax crystal morphology in pas2 mutants compromise the plant cuticle, leading to organ fusion and likely affecting water relations and pathogen resistance (bach2008theverylongchainhydroxy pages 3-4, bach2008theverylongchainhydroxy pages 2-2). The cuticular defects reflect the essential role of VLCFAs as precursors for cuticular wax biosynthesis.
| Attribute | PAS2 annotation and evidence |
|---|---|
| Gene identity | PAS2 / PASTICCINO2, Arabidopsis locus At5g10480; synonyms PEP / PEPINO; UniProt Q8VZB2. The literature consistently identifies this protein as the Arabidopsis very-long-chain fatty-acid elongation dehydratase, confirming the requested identity rather than an unrelated PAS2 gene (bach2008theverylongchainhydroxy pages 1-2, morineau2016dualfattyacid pages 1-2). |
| Protein family and domains | Member of the eukaryotic 3-hydroxyacyl-CoA dehydratase (HACD/HCD) family; contains a protein-tyrosine-phosphatase-like PTPLA/Tyr_Pase-like domain. Its experimentally supported primary activity is dehydration, not protein-tyrosine dephosphorylation; the dehydratase-associated residues include Tyr156 and Glu163 (bach2008theverylongchainhydroxy pages 4-5, zhu2020disruptionofverylongchainfatty pages 3-5). |
| Primary protein function | Catalytic HCD component of the membrane-bound fatty-acid elongase complex, performing the third of four reactions in each very-long-chain fatty-acid (VLCFA) elongation cycle. PAS2 is essential and can be limiting for VLCFA production (bach2008theverylongchainhydroxy pages 1-2, bach2008theverylongchainhydroxy pages 4-5). |
| EC number | EC 4.2.1.134, very-long-chain (3R)-3-hydroxyacyl-CoA dehydratase (functional assignment supported by biochemical genetics and complementation) (bach2008theverylongchainhydroxy pages 1-2, bach2008theverylongchainhydroxy pages 2-2). |
| Catalyzed reaction | (3R)-3-hydroxyacyl-CoA → trans-2-enoyl-CoA + H₂O. The trans-2-enoyl-CoA is subsequently reduced by CER10/ECR to generate an acyl-CoA elongated by two carbons relative to the substrate entering that cycle (bach2008theverylongchainhydroxy pages 2-3, roudier2010verylongchainfattyacids pages 1-2). |
| Substrate class and specificity | Acts on 3-hydroxyacyl-CoA elongation intermediates, not free fatty acids. Accumulation of saturated 3-hydroxy-C18:0-, C20:0-, and C22:0-CoA species in pas2 mutants provides direct pathway evidence. Available studies support broad long-/very-long-chain intermediate use but do not establish a complete kinetic chain-length or unsaturation profile; chain-length selectivity of an elongase complex is primarily imposed by its KCS condensing enzyme (bach2008theverylongchainhydroxy pages 3-4, bach2008theverylongchainhydroxy pages 2-3). |
| Biochemical context | ER fatty-acid elongation extends C16/C18-derived acyl-CoAs by repeated two-carbon cycles comprising KCS condensation, KCR reduction, PAS2 dehydration, and CER10/ECR reduction. PAS2-dependent VLC acyl-CoAs supply sphingolipids, phospholipids, cuticular waxes, suberin-associated lipids, and seed triacylglycerols (batsale2021biosynthesisandfunctions pages 3-5, batsale2021biosynthesisandfunctions pages 9-10). |
| Core subcellular localization | Principally associated with the endoplasmic-reticulum membrane, the established location of microsomal VLCFA elongation (bach2008theverylongchainhydroxy pages 2-2, morineau2016dualfattyacid pages 6-8, bach2011verylongchainfattyacids pages 1-3). |
| Additional reported localization | A functional native-promoter GFP-PAS2 fusion was also detected at the Golgi, with more than 90% signal overlap with tested Golgi markers in dark-grown hypocotyl cells and colocalization with Golgi cellulose-synthase complexes. Because other fusion designs produced ER-only localization, Golgi residence should be regarded as supported but construct- and context-sensitive, pending confirmation for native untagged PAS2 (zhu2020disruptionofverylongchainfatty pages 11-13, zhu2020disruptionofverylongchainfatty pages 8-11, zhu2020disruptionofverylongchainfatty pages 13-15). |
| Experimentally reported interactors | CER10/ECR, the next enzyme in the elongation cycle, interacts with PAS2 in ER-localized BiFC assays. PAS2 also associates with PAS1, KCR, and multiple KCS condensing enzymes; reported KCS partners include KCS1, KCS5, KCS6, KCS8, KCS9, KCS10, and KCS18. These associations support participation in multiple elongase assemblies rather than action as a soluble enzyme (bach2008theverylongchainhydroxy pages 3-4, bach2008theverylongchainhydroxy pages 1-2, morineau2016dualfattyacid pages 6-8, roudier2010verylongchainfattyacids pages 3-4). |
| Tissue and developmental expression | PAS2 is developmentally regulated and detected in seedlings, roots, leaves, stems, and flowers. Strong epidermal/L1 expression is supported by an L1-box in its promoter and regulation by epidermal factors ATML1/PDF2; root analyses additionally reported PAS2 enrichment mainly in the endodermis, indicating organ- and cell-context specificity rather than universal epidermal restriction (morineau2016dualfattyacid pages 11-12, nobusawa2013synthesisofverylongchain pages 9-11, zhu2020disruptionofverylongchainfatty pages 3-5). |
| Key functional validation | pas2 mutants accumulate the predicted hydroxyacyl-CoA substrates and lose VLCFAs from several lipid pools; the yeast ortholog PHS1 complements mutant biochemical and developmental defects. Strong loss of function is embryo-lethal, whereas partial loss produces severe developmental abnormalities, demonstrating that the annotated enzymatic function is biologically essential (bach2008theverylongchainhydroxy pages 1-2, bach2008theverylongchainhydroxy pages 2-3, roudier2010verylongchainfattyacids pages 1-2). |
| Key references | Bach et al., 2008, PNAS—primary biochemical identification of PAS2 as the essential, limiting VLCFA dehydratase (bach2008theverylongchainhydroxy pages 1-2); Roudier et al., 2010, The Plant Cell—VLCFA elongase organization and developmental patterning (roudier2010verylongchainfattyacids pages 1-2); Bach et al., 2011, Journal of Cell Science—PAS2-dependent VLCFAs in cytokinesis and cell-plate maturation (bach2011verylongchainfattyacids pages 7-8); Morineau et al., 2016, PLOS ONE—dual dehydratase complexes and KCS interactions (morineau2016dualfattyacid pages 6-8); Zhu et al., 2020, Plants—ER/Golgi localization and cellulose-synthase dynamics (zhu2020disruptionofverylongchainfatty pages 8-11); Batsale et al., 2021, Cells—authoritative synthesis of plant VLCFA pathways and products (batsale2021biosynthesisandfunctions pages 3-5). |
Table: Consolidated identity, catalytic reaction, substrate evidence, localization, interaction, expression, and pathway information for Arabidopsis PAS2/Q8VZB2. The table distinguishes firmly established enzymatic properties from context-sensitive localization and incompletely resolved substrate specificity.
PAS2 contains both a functional dehydratase domain and a protein-tyrosine-phosphatase-like (PTPLA) domain (bach2008theverylongchainhydroxy pages 4-5, zhu2020disruptionofverylongchainfatty pages 11-13). Despite the presence of the PTPLA domain, extensive functional and structural analyses have established that PAS2's catalytic activity resides in the dehydratase-associated residues (Tyr156 and Glu163) rather than in the PTP-like motif (bach2008theverylongchainhydroxy pages 4-5, zhu2020disruptionofverylongchainfatty pages 3-5). The enzyme can functionally complement the yeast phs1 mutant, confirming evolutionary conservation of the dehydratase activity (bach2008theverylongchainhydroxy pages 2-3, bach2008theverylongchainhydroxy pages 2-2).
Arabidopsis possesses a second PTPLA-domain protein (PTPLA) that can function as a dehydratase in yeast but has limited activity in planta (morineau2016dualfattyacid pages 11-12, morineau2016dualfattyacid pages 1-2). PAS2 and PTPLA form the basis of two independent, functionally interacting elongase complexes with distinct tissue-specific expression patterns and KCS associations (morineau2016dualfattyacid pages 11-12, morineau2016dualfattyacid pages 1-2). PAS2 is the predominant functional dehydratase, with PTPLA expression mainly restricted to vascular tissues and pericycle cells, whereas PAS2 is enriched in epidermis and endodermis (morineau2016dualfattyacid pages 11-12). PTPLA's effects on VLCFA levels are dependent on PAS2 activity, further confirming PAS2 as the major Arabidopsis HCD enzyme (morineau2016dualfattyacid pages 11-12).
PAS2 (PASTICCINO2/PEPINO, At5g10480, Q8VZB2) encodes an essential, rate-limiting 3-hydroxyacyl-CoA dehydratase that catalyzes the third step of very-long-chain fatty acid elongation in Arabidopsis thaliana (bach2008theverylongchainhydroxy pages 1-2). The enzyme functions as part of an ER-membrane-bound multiprotein elongase complex, catalyzing the dehydration of 3-hydroxyacyl-CoA intermediates to trans-2-enoyl-CoA products (bach2008theverylongchainhydroxy pages 1-2, bach2008theverylongchainhydroxy pages 2-3). PAS2 exhibits broad substrate specificity for long-chain and very-long-chain 3-hydroxyacyl-CoA species, with demonstrated activity on C18-C22 intermediates (bach2008theverylongchainhydroxy pages 3-4, bach2008theverylongchainhydroxy pages 2-3).
The VLCFAs produced through PAS2-dependent elongation are essential precursors for diverse lipid classes including sphingolipids, cuticular waxes, suberin, membrane phospholipids, and storage triacylglycerols (batsale2021biosynthesisandfunctions pages 3-5, bach2008theverylongchainhydroxy pages 2-3, batsale2021biosynthesisandfunctions pages 9-10). Through these lipid products, PAS2 influences multiple critical cellular processes including cytokinesis and cell plate formation (bach2011verylongchainfattyacids pages 7-8, bach2011verylongchainfattyacids pages 8-9), membrane trafficking and protein localization (markham2011sphingolipidscontainingverylongchain pages 5-7, markham2011sphingolipidscontainingverylongchain pages 10-12), auxin transport and developmental patterning (roudier2010verylongchainfattyacids pages 1-2, roudier2010verylongchainfattyacids pages 7-8), and cellulose synthesis and cell wall formation (zhu2020disruptionofverylongchainfatty pages 3-5, zhu2020disruptionofverylongchainfatty pages 11-13).
The pleiotropic developmental phenotypes of pas2 mutants—ranging from embryonic lethality in null alleles to dwarf growth, organ fusion, impaired cytokinesis, defective lateral root development, and altered cell proliferation in hypomorphic alleles—underscore the fundamental importance of VLCFA biosynthesis for plant development (bach2011verylongchainfattyacids pages 3-3, bach2008theverylongchainhydroxy pages 2-2, roudier2010verylongchainfattyacids pages 2-3, bach2008theverylongchainhydroxy pages 2-3, roudier2010verylongchainfattyacids pages 1-2). PAS2 is predominantly expressed in epidermal tissues, consistent with the importance of VLCFAs for surface barrier formation, though expression also occurs in endodermis and other tissues where VLCFAs serve specialized functions (morineau2016dualfattyacid pages 11-12, nobusawa2013synthesisofverylongchain pages 9-11).
The protein physically interacts with other elongase components including CER10/ECR and multiple KCS isoforms, and recent evidence suggests possible additional localization to the Golgi apparatus where it may associate with cellulose synthase complexes (bach2008theverylongchainhydroxy pages 3-4, morineau2016dualfattyacid pages 6-8, roudier2010verylongchainfattyacids pages 3-4, zhu2020disruptionofverylongchainfatty pages 8-11). This combination of established biochemical function, characterized protein interactions, defined subcellular localization, and well-documented developmental consequences makes PAS2 one of the best-characterized components of plant VLCFA metabolism and demonstrates how a single enzymatic step in lipid biosynthesis can profoundly influence diverse aspects of plant biology.
References
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