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| 0.0 | The research start at: 2026-09-04 15:32:35 (UTC+8) |
| 1.53 | The title is: Taxus Species, Including Taxus chinensis, Taxus mairei, and Taxus wallichiana, as Natural Sources of Paclitaxel |
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Title: Taxus Species, Including Taxus chinensis, Taxus mairei, and Taxus wallichiana, as Natural Sources of Paclitaxel
Paclitaxel Biosynthesis Pathway Evolution and Molecular Regulation in Taxus Species
Paclitaxel (PTX) is a high-value plant natural product derived from Taxus (yew) species [1]. Its biosynthesis involves intricate pathways spanning multiple enzymatic steps, with the Taxol pathway hypothesized to include 19 transformations and at least 13 previously characterized enzymes [5,14]. Key gene families involved in PTX biosynthesis have expanded, including BAHD acyltransferases and aromatic prenyltransferases [2]. In Taxus chinensis, 71 genes from diverse families—categorized into GGPPS, T5αOH, T13αOH, TAT, T2αOH, T7βOH, T10βOH, TBT, BAPT, DBTNBT, CoA Ligase, PAM, T14βOH, TB506, and TXS—were identified in the whole genome [3]. Very recently, five reports have addressed oxetane ring biosynthesis: Fernie and Kampranis linked a 4β,20-epoxidase (2-ODD) and taxadiene 5α-hydroxylase (T5αH, CYP725A4) to oxetane formation in N. benthamiana, noting a common intermediate (5-hydroxy-4(20)-epoxy-taxane [4]) [5]; three simultaneous studies identified novel cytochrome P450 enzymes (named oxetanase or oxetane synthase) responsible for the ring, with ²H/¹⁸O labelling and DFT calculations supporting an intramolecular oxidation-acetoxyl rearrangement mechanism [5]. PTX is currently produced via semi-synthesis from baccatin III extracted from Taxus, and recent genome-sequencing studies have uncovered minimal gene sets for baccatin III and PTX biosynthesis despite unresolved intermediates [6].
Evolutionary analysis of Taxus CYP450s—critical for ~half of PTX biosynthetic reactions—identified 649 genes, with CYP750 and CYP725 families expanded relative to 68 other species [7]. The Taxus-specific CYP725A subfamily (including all known PTX pathway CYP450s) showed independent evolution, with 74.68% of its genes on pseudochromosome 9; groups 9.1 and 9.2 contained all PTX-related CYP725As and 12 undefined members [7]. A ‘taxadiene gene cluster’ in group 9.2 (two TS, two T5αH, and two unknown CYP725As) exhibited coordinated expression and jasmonate responsiveness [7]. Biochemical assays confirmed TS1/2 (TS activity) and T5αH1/2/3 (taxa-4(5),11(12)-diene-5α-hydroxylase activity), with TS2 (a Taxus-specific duplication ~33.2 Ma) having higher catalytic efficiency and jasmonate induction than TS1 [7]. The TS locus showed adaptive evolution in T. mairei and T. wallichiana var. yunnanensis (dN/dS ≠ 1) [8]. Comparative collinearity between T. wallichiana (chr9: 19.76–27.16 Mb PTX cluster) and Torreya grandis (a non-PTX-producing relative diverged ~68.5 Ma) revealed collinear regions but missing CYP450 homologs in T. grandis, suggesting the cluster emerged post-divergence [9]. Eighty-four percent of CYP725A members (54/64) and 10 key PTX genes (e.g., TXS, T5αOH, T10βOH) cluster on T. wallichiana chr9 [9]. T. wallichiana also has 158 DOXC class ODD genes (many tandemly expanded), with 9/11 tested candidates showing potential C4β–C20 epoxidation activity in yeast [9].
Molecular regulation of PTX biosynthesis involves transcriptional and post-transcriptional mechanisms. In T. chinensis, jasmonate upregulated nearly all pathway enzyme genes (maximal effect at 4 hours) [3]. A total of 990 transcription factors (TFs) from 60 families (predominantly MYB, AP2/ERF, bHLH, HB, LOB, MADS, WRKY) were identified, with regulatory networks including 10 enzyme genes, 28 TFs, and miRNA/phasiRNA-mediated post-transcriptional control [3]. Promoters of 14 PTX pathway genes contain E-boxes and are jasmonic acid-inducible: MYC2 activated all, while MYC3/4 did not induce BAPT/14βOH; TcJAMYC1 negatively regulated DBBT/BAPT/DBTNBT, and TcJAMYC2 induced T5αH/PAM [30,35]. The rate-limiting enzyme DBAT is regulated by TcWRKY1 (basal to group IIa/IIb clades) and TaWRKY1 [83,118]. In T. chinensis suspension cells, glossy cell-promoting conditions (linked to alkaloid accumulation) altered transcript levels: Taxadiene 5 Hydroxylase was suppressed by Picloram (anti-glossy) and induced by aluminium (pro-glossy); DBTNBT showed early aluminium induction and Picloram suppression [10].
Paclitaxel Biosynthesis Gene Expression and Taxane Content in Taxus Cultivars
| Cultivar | Key Transcript/Content Changes | Citations |
|---|---|---|
| T. yunnanensis ZD1 (higher PTX/10-DABIII than WT) | 101 DEGs in 10 PTX pathway genes upregulated; ts (4.3–24x) and t13oh (5.6–442x) most significant; negative correlations between TFs and pathway genes (dbat, tm10bh, bapt, tat, tbt, t5oh, t13oh, t14oh, dbnbt, ts) | [11] |
| T. cultivar JXS (3.2x higher PTX than WT) | T5H (11.5x WT) and T10OH (6.5x WT) upregulated; T13OH and DBAT downregulated; altered hormone signaling (JA: COI1/JAZ/MYC2 up; GA: DELLA up; auxin: ARF/SAUR/GH3 up) and hormone biosynthesis genes up | [12] |
Environmental factors also regulate PTX biosynthesis. High light downregulated most pathway genes (GGPPS, TS isoforms, T5αH, T13αH, T10βH, TAT, TBT, DBAT, DBTNBT, PAM, 4CL) in T. chinensis [13]. UV-A + 48 h dark significantly increased PTX content (maximal at 6 h UV-A + 48 h dark), inducing MEP (DXR) and shikimate (SDH) pathway enzymes only in this combination; most PTX genes were suppressed by single UV-A but upregulated during post-UV-A dark incubation (maximal at 6 h UV-A + 36 h dark) [14]. Tissue-specific taxane accumulation was observed: T. mairei roots accumulated 10-DAB, baccatin III, and PTX, with 10-DAB correlated to TwBAHD16, baccatin III to TwBAHD95/73/76/62, and PTX to 21 TwBAHD genes (p < 0.01) [15]; T. chinensis cone/root had higher pathway gene expression than leaf/bark [3]. Epigenetic regulation is also relevant, with DNA methylation potentially silencing secondary metabolite production in long-term cell cultures [1].
Recent transcriptomic and genome-sequencing advances have elucidated PTX biosynthetic gene sets, enabling heterologous production efforts [1]. Partial pathway reconstitution in microbial/plant chassis has been achieved (e.g., a 17-gene baccatin III pathway with higher yields than prior sets), though complete biosynthesis remains challenging [5,14]. TXS (the first committed enzyme) is rate-limiting due to low activity (kcat/KM = 3.5 x 10³ S⁻¹M⁻¹) relative to other plant terpene cyclases; metabolic engineering in E. coli achieved taxadiene production up to 1 g/L [16]. Full PTX biosynthesis would require co-expressing up to 19 plant genes plus GGPP precursor engineering [17]. In T. baccata, GGPP synthase (homodimeric, ~76 kDa native, ~38 kDa subunit) depends on Mn²⁺/Mg²⁺, catalyzing GGPP synthesis from IPP (Km=1.5 mM), FPP (Km=2.46 mM), or DMAPP (Km=12.7 mM) [18]. Methyl jasmonate enriched cDNA libraries from T. cuspidata cell cultures, with DXP pathway, GGPP synthase, and PTX genes representing up to 5% of the library [17].
Taxus Cell Culture Optimization and Elicitation for Enhanced Paclitaxel Yield
Plant cell culture (PCC) is a viable platform for paclitaxel production, offering independence from environmental factors, continuous uniform quality, and renewability—with industrial production established by companies like Phyton Biotech and Samyang Genex[19]. However, challenges include genetic instability, low growth rates, and variable yields[19]. Selection of highly productive Taxus cell lines and optimization of culture conditions have enabled paclitaxel accumulation up to 0.03–0.05% dry weight (d.w.)[20], with further enhancements through elicitation, as some paclitaxel biosynthetic enzymes are jasmonate-inducible[20]. Methyl jasmonate (MeJA) is a particularly powerful stimulator of paclitaxel production[21], with additional strategies including dual elicitation, sucrose feeding, temperature shifts, and fed-batch cultivation improving yields. Limitations remain, such as variability in secondary metabolite accumulation (speculated to have genetic or epigenetic causes) and incomplete understanding of paclitaxel’s global metabolism (including transport and degradation), which hinders full optimization[22].
Paclitaxel Yields and Key Elicitation/Culture Strategy Outcomes in Taxus Cell Cultures
| Culture System/Strategy | Taxus Species/Line | Paclitaxel Yield/Outcome | Citation(s) |
|---|---|---|---|
| MeJA treatment + high-density culture system | T. x. media | 295 mg/L | [21] |
| Multiple jasmonate treatments in bioreactors | Not specified | 612 mg/L | [20] |
| MeJA elicitation (14 days post-elicitation) | P93AF+ line | 0.05 mg/g d.w. | [23] |
| MeJA elicitation (14 days post-elicitation) | CO93D+ line | 0.15 mg/g d.w. (3x higher than P93AF+; reduced cell growth) | [23] |
| Small vs. large aggregate cultures (MeJA-elicited) | T. cuspidata P93AF | Small aggregates: 15-fold more paclitaxel than large aggregates; r = -0.75 (p < 0.01) correlation with size | [23][24][25] |
| Dual elicitation (50 mM CD day 13 + 1 μM Cor day 17) | T. baccata | 303.75 μg/g (5.62x untreated; >90% extracellular) | [26] |
| MeJA (100 μM) + sucrose (20 g/L day 7) | T. chinensis | 527 mg/L | [27] |
| Temperature shift (24→29°C) | T. chinensis | 82.4 mg/L (up from 49.6 mg/L) | [28] |
| Fed-batch cultivation | T. chinensis | 1.5x biomass increase; 4.9x paclitaxel increase | [29] |
| Product formation medium (B5 + 3% sucrose + 2 mg/L Picloram + 0.1 mg/L kinetin) | T. baccata | 1.58 mg/L paclitaxel (3.0x growth medium); 0.32 mg/L baccatin III (3.5x growth medium) | [30] |
| Product formation medium + 100 mM MeJA | T. baccata | 7.09 mg/L paclitaxel (4.5x control); 3.49 mg/L baccatin III (10.8x control) | [30] |
| Two-stage culture (growth → production medium) + 100 μM MeJA | T. baccata | 4.7x paclitaxel increase | [31] |
| Two-stage culture + 100 μM MeJA + 10 μM HyproTaximin | T. baccata | 6.6x paclitaxel increase (peak at 7 days) | [31] |
| MeJA elicitation (7 days post-elicitation) | T. wallichiana Tw-bbg/B5-NB-pvp | 0.19 mg/gDW (up from 0.02 mg/gDW; ~0.02% DW, comparable to intact plants) | [32] |
| MeJA elicitation (7 days post-elicitation) in 6-year-old "old" culture | T. wallichiana | ≤3.5 µg/gDW (diminished effect) | [32] |
In Taxus cell cultures, MeJA elicitation induces paclitaxel accumulation in paclitaxel-accumulating lines but not in non-accumulating lines[23], with higher accumulation correlating with reduced cell growth in some lines[23]. The negative correlation between aggregate size and paclitaxel accumulation aligns with higher expression of paclitaxel biosynthetic enzymes in smaller aggregates[23]. MeJA also upregulates most paclitaxel biosynthetic pathway genes (1.5–160-fold)[25], with promoters of key pathway genes (e.g., taxadiene synthase, taxadien-5α-ol hydroxylase) activated by MeJA[33]. In silico analysis of these promoters revealed a disproportionately high number of E-boxes (CANNTG: 37 vs. 31 expected randomly)[33]. The TcJAMYC1 protein—whose transcripts increase post-MeJA elicitation[33]—binds to CACGTG and CATGTG E-boxes[33] and negatively regulates DBBT, BAPT, and DBTNBT promoters by at least 3-fold[33]; TcJAMYC2 induces T5αH and PAM promoters[33], while TcJAMYC4 downregulates most pathway promoters except TASY[33].
Beyond MeJA, new generation elicitors like coronatine (Cor) and cyclodextrins (CD) enhance paclitaxel production[34]. Aluminum ions promote glossy cell formation and baccatin III accumulation in T. chinensis cultures, with corresponding upregulation of taxadiene 5 hydroxylase, DBAT, and DBTNBT transcripts[10], while MeJA induces baccatin VI accumulation[10]. Paclitaxel is released from cells via multivesicular bodies fusing with the plasma membrane[10], and extracellular accumulation reduces toxicity and feedback inhibition[26].
Traditional strategies to reduce paclitaxel variability and increase yields include cell line selection, media and environmental optimization, and precursor feeding or elicitation, while newer approaches involve molecular biology and metabolic engineering[22].
Metabolic and Genetic Engineering Strategies for Paclitaxel Precursor Production
This section summarizes key advances in taxane biosynthesis research, focusing on gene isolation, heterologous expression optimization, and bioprocess development for paclitaxel intermediates. Below is a consolidated overview of experimental outcomes and critical findings, followed by a narrative analysis.
Key Experimental Outcomes in Taxane Biosynthesis Research
| Target Molecule/Enzyme | Host Organism | Key Modifications/Optimizations | Results | Citations |
|---|---|---|---|---|
| Total RNA (Taxus chinensis) | — | Universal rapid extraction kit (BioTeke, Beijing) | RNA extraction for cDNA synthesis | [35] |
| TcDBAT gene | — | Amplified from T. chinensis cDNA (post-RNA extraction/reverse transcription) | Gene isolation for downstream applications | [35] |
| Baccatin III | Whole-cell biotransformation (T. chinensis needles) | Optimal conditions: 16 °C, LB + 10 g/L glycerol, pH 6.5, 48 h | 20.66 mg/L baccatin III from 40 g/L needles (67.15% yield increase vs. pre-optimization) | [35] |
| T10βOH-1 | S. cerevisiae W303–1B | Comparison with T10βOH-2; overexpression via GAL1/GAL10 (TAX01) vs. PGK1/TDH3 (TAX02) promoters | T10βOH-1 more active; TAX02 yield 3.98× higher than TAX01 (constitutive promoter preferred) | [36] |
| T5α-AC-10β-ol | S. cerevisiae W303–1B | Multi-copy chassis (TAX03: 3× T10βOH-1 + tTcCPR; TAX06: additional T10βOH-1/tTcCPR plasmids) | 15.8 mg/L yield (66.7% increase; highest reported) | [36] |
| T10OH (de novo) | E. coli | Codon-optimized T10βH (T. cuspidata); N-terminal truncations (fT10βH, t7, t20, t39); fusion with CPR via linker | t20T10βH (strain T3) catalyzed T5OAc→T10OH (first de novo microbial synthesis) | [37] |
| T10OH | E. coli | Protein engineering (AlphaFold2 modeling; PROSS/FoldX mutations: I75F, L226K, S345V; triple mutant M3) | Strain T6 (M3) yielded 2.23 mg/L T10OH (2.3× increase vs. WT t20T10βH) | [37] |
| T10OH | E. coli (5 L bioreactor) | Optimized culture (18 °C, 0.10 mM IPTG, 20 g/L glycerol; fed-batch) | Peak titer 3.89 mg/L (highest reported de novo microbial T10OH) | [37] |
| Taxadiene | E. coli | TXS expression (initial); multivariate-modular pathway optimization | 1.3 mg/L (initial); 1 g/L (optimized) | [16] |
| Taxadiene | Yeast | Combined expression: TXS + S. acidocaldavus GGPPS + truncated HMGR + UPC2-1 mutant | Titer increased from 0.2 mg/L to 8.7 mg/L | [16] |
| Taxol | Ozonium sp. EFY-21 | Overexpression of Taxus ts gene (fungal promoter) | 5× taxol yield vs. control | [38] |
| DBAT (T. wallichiana var. mairei) | — | Gene amplification (1323 bp, GenBank JQ029678); active site mutations (H162A, others) | H162 critical for activity; mutant kcat/KM reduced | [39] |
| 10-Deacetylbaccatin III | Taxus extract | Bio-catalysis via C-13 taxolase, C-10 deacetylase, C-7 xylosidase | 5.5–24× yield increase (species-dependent) | [40] |
Research on taxane biosynthesis has focused on overcoming rate-limiting steps and optimizing heterologous expression systems. For example, T10βOH, a key post-acetylation hydroxylase, was initially hindered by low catalytic efficiency in microbes [36]; multi-copy chassis and constitutive promoter use in S. cerevisiae resolved this, achieving the highest reported T5α-AC-10β-ol yield [36]. In E. coli, codon optimization and N-terminal truncation of T10βH enabled the first de novo microbial synthesis of T10OH, with protein engineering (triple mutations) and fed-batch culture further boosting titers [37].
TXS, the rate-limiting first committed enzyme in paclitaxel biosynthesis, exhibits low activity (kcat/KM = 3.5 × 10³ S⁻¹M⁻¹) compared to other plant terpene cyclases [16]. Heterologous expression in E. coli and yeast required pathway optimization (e.g., GGPPS overexpression, HMGR truncation) to mitigate GGPP precursor limitations [16]. Additionally, biotransformation of Taxus needles and enzyme engineering of DBAT (e.g., H162 mutation analysis) have advanced baccatin III production [16, 147], while bio-catalysis with taxane-converting enzymes improved 10-deacetylbaccatin III yields [40]. These efforts collectively address critical bottlenecks in microbial and plant-based taxane production.
Paclitaxel Extraction and Quantification Methodologies in Taxus Species
Among the Taxus species, T. chinensis, T. mairei, and T. wallichiana are recognized as natural sources of paclitaxel, with varying compound levels reported across species, tissues, and geographical locations. Below is a summary of paclitaxel concentration data from key studies on these species:
Paclitaxel Concentrations in Taxus Species and Tissues
| Taxus Species/Tissue | Paclitaxel Concentration | Citation |
|---|---|---|
| T. mairei twigs | 0.07–0.11 mg g⁻¹ | [41] |
| T. wallichiana (shoots, leaves, barks) | 0.07–0.22 μg/mg | [42] |
| T. wallichiana bark (Sikkim, Samanden chemotype) | Highest concentration (unspecified value) | [43] |
T. chinensis is among the commonly studied Taxus species for paclitaxel isolation and purification [44].
Extraction methodologies for paclitaxel vary by source material. For T. wallichiana var. mairei, ultrasonic-assisted extraction with methanol uses 50 mg of dried material extracted three times with 1.0 mL MeOH (10 min sonication, centrifugation, volume adjustment) [42]. Ionic liquids (ILs) as adjuvants under optimized conditions (1.2% IL amount, 1:10.5 solid–liquid ratio, 30 min ultrasonic irradiation) yield 0.224 mg/g paclitaxel [45]. For T. chinensis suspension cell cultures, paclitaxel extraction from cells involves lyophilization, Soxhlet extraction with methanol, and rotary evaporation [10]; extracellular paclitaxel from culture media uses dichloromethane extraction, solvent evaporation, and resuspension in methanol [26].
Quantification of paclitaxel and related taxoids employs diverse analytical techniques. High-performance liquid chromatography (HPLC) is widely used, such as for T. wallichiana bark extracts (C18 column, methanol/water 80/20 eluent at 1 mL/min, 230 nm detection) [26]. High-performance thin layer chromatography (HPTLC) offers rapid, reliable paclitaxel estimation from T. wallichiana bark [43]. Immunoassays (time-resolved fluoroimmunoassay [TRFIA] and enzyme-linked immunosorbent assay [ELISA]) show a strong correlation (Spearman R = 0.929, P < 0.01) for Taxus samples [42]. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) uses selected-reaction monitoring (transition 854 → 286) on a triple quadrupole mass spectrometer [46]. Molecularly imprinted columns enrich paclitaxel from crude extracts, reducing impurities for subsequent HPLC analysis [47].
Sustainable Paclitaxel Production Alternatives to Taxus Bark Extraction
Paclitaxel, a diterpenoid with a taxane skeleton isolated from Taxus species and used against a range of cancer types[48][49][50], was originally extracted from wild Taxus brevifolia but is present in all Taxus species[48]. Historically, direct extraction from Taxus plants was the primary preparation method, but wild resource extraction is unviable due to the compound’s extremely low concentration (0.01%-0.03% of dry weight) and slow yew growth rates[49][51][19]. The destruction of wild yew trees for extraction has prompted urgent development of sustainable alternatives[49][52], including artificial cultivation, improved extraction technologies, chemical semi-synthesis, plant cell culture (PCC), endophytic fungi, and synthetic biology/metabolic engineering.
Key Yield and Purity Outcomes of Paclitaxel Production Methods
| Method Category | Specific Technique/Modification | Outcome | Citations |
|---|---|---|---|
| Extraction Technologies | Ultrasound and negative pressure cavitation extraction (NPCE) | >99% paclitaxel extraction in 3 minutes | [51] |
| Chemical Semi-Synthesis | 10-DAB isolation from yew needles for semi-synthesis | 53% yield | [51] |
| Chemical Semi-Synthesis | 10-deacetyl-7-xylosyltaxanes conversion to paclitaxel (3 steps) | 99.52% purity, 67.6% total yield | [51] |
| Plant Cell Culture (PCC) | Multiple jasmonate treatments in bioreactors | 612 mg/L paclitaxel production | [20] |
| PCC Genetic Engineering | DBTNBT overexpression + elicitation in Taxus cell lines | Up to 367 mg/L (9.91-fold vs. elicited BAPT lines; 5.47-fold vs. WT) | [53] |
| PCC Genetic Engineering | PALg1 modification in Taxus chinensis cell lines | 25-fold increase (0.76 μg/g DW to 24.5 μg/g DW vs. non-genetically modified lines) | [54] |
| PCC Media Optimization | M10 medium (day 23) | 106.6 µg l⁻¹ total paclitaxel (vs. 77.7 µg l⁻¹ control) | [55] |
| Endophytic Fungi Optimization | Pectin as elicitor (pH 6.0, 5% sucrose, 4.3 mM ammonium phosphate) | 8-fold increase in total taxane yield by day 21 | [56] |
| Endophytic Fungi Engineering | Taxus ts gene overexpression in Ozonium sp. EFY-21 | 5-fold increase in taxol production | [38] |
| Endophytic Fungi Co-Culture | Paraconiothyrium sp. + Alternaria sp. + Phomopsis sp. | 8-fold increase in taxol production | [38] |
| Synthetic Biology | Codon-optimized taxadiene synthase in Saccharomyces cerevisiae | 40-fold increase to ~8.7 mg/L taxadiene yield | [20] |
Artificial cultivation has been implemented to address clinical demand and preserve wild Taxus species, with over 150 yew forest farms established across China—including Sichuan Province seedling bases distributing seedlings nationally[51]. A sustainable harvesting approach involves collecting branches/needles (instead of bark) to keep plants alive, enabling repeated extraction of paclitaxel or its precursor 10-deacetylbaccatin III (10-DAB)[51]. Modern extraction technologies (microwave-assisted solvent extraction, ultrasound-assisted extraction, supercritical CO₂ extraction, pressurized solvent extraction) reduce solvent use and operating time while improving purity and yield compared to conventional methods[51].
Chemical semi-synthesis is the current dominant market source, accounting for ~80% of paclitaxel supply[51]. After 10-DAB’s 1988 isolation for semi-synthesis, patents for baccatin III-based semi-synthesis followed; Bristol Myers Squibb discontinued bark extraction in 1994 post-FDA approval for these methods[51]. Semi-synthesis focuses on 10-DAB and baccatin III (abundant in Taxus needles/twigs) reacted with 7-triethylsilyl baccatin III, though C2′-OH epimerization reduces yield and increases costs[51]. Alternative natural precursors (10-deacetyl-7-xylosyltaxanes, 10-deacetyl paclitaxel-7-xyloside) have been repurposed for semi-synthesis[51]. Total chemical synthesis is commercially non-viable due to pathway complexity[57][50].
PCC is a viable sustainable alternative, offering independence from environmental factors, continuous uniform quality, and renewability[19], with industrial production established via Phyton Biotech and Samyang Genex[19]. Elicitation with coronatine, salicylic acid, methyl jasmonate (MJ), and abscisic acid enhances paclitaxel accumulation[49]; MJ, a biotic defense regulator, is particularly effective[49]. Co-culturing Taxus cells with endophytic fungi also boosts production[49], while cambial meristematic cells exhibit better growth and higher paclitaxel levels than dedifferentiated cells[19].
Endophytic fungi isolated from Taxus species (e.g., E. nigrum YEF2[58], Cladosporium cladosporioides[38], Aspergillus candidus[38], Ozonium sp. EFY-21[38], Paraconiothyrium sp.[38], Coniothyrium palmarum[59], Annulohypoxylon sp. MUS1[60]) are alternative sources. Fungi with taxol biosynthetic genes (ts, dbat, bapt) can produce taxol[48]; for example, Cladosporium cladosporiodes’ dbat gene shows 99% similarity to Taxus media and 97% to T. wallichiana[48]. Over 35 endophytic fungal species (e.g., Glomerella cingulata, Pestalotiopsis terminaliae) produce paclitaxel[61], with low concentrations inhibiting cancer cell proliferation (lung, breast, intestine, colon, leukemia lines)[61].
Synthetic biology and metabolic engineering are emerging strategies: microbial platforms (yeast, moss) have been engineered to produce taxadiene, a paclitaxel precursor[62][20]. Taxadiene synthase expression in Physcomitrella patens reached 0.05% of fresh weight without growth inhibition[20]. Transcription factor MYC2-driven chassis cells are promising for specialized metabolite synthesis[63]. Challenges (genetic instability, low growth rates, variable yields, limited microbial production success) persist, driving exploration of combined approaches (synthetic consortia, nanotechnology) for sustainable supply[19][64]. Novel biotechnological approaches (e.g., cell-based bioprocess engineering) are considered the best strategy to avoid Taxus extinction and enable cost-effective large-scale production[52].
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