The neutral carotenoids of wild-type and mutant strains of Neurospora crassa

Diversity of biologically active secondary metabolites in the ascomycete order Sordariales

Ascomycetes belonging to the order Sordariales are a well-known reservoir of secondary metabolites with potential beneficial applications. Species of the Sordariales are ubiquitous, and they are commonly found in soils and in lignicolous, herbicolous, and coprophilous habitats. Some of their species have been used as model organisms in modern fungal biology or were found to be prolific producers of potentially useful secondary metabolites. However, the majority of sordarialean species are poorly studied. Traditionally, the classification of the Sordariales has been mainly based on morphology of the ascomata, ascospores, and asexual states, characters that have been demonstrated to be homoplastic by modern taxonomic studies based on multi-locus phylogeny. Herein, we summarize for the first time relevant information about the available knowledge on the secondary metabolites and the biological activities exerted by representatives of this fungal order, as well as a current outlook of the potential opportunities that the recent advances in omic tools could bring for the discovery of secondary metabolites in this order.

Carotenoids and Their Biosynthesis in Fungi

Carotenoids represent a class of pigmented terpenoids. They are distributed in all taxonomic groups of fungi. Most of the fungal carotenoids differ in their chemical structures to those from other organisms. The general function of carotenoids in heterotrophic organisms is protection as antioxidants against reactive oxygen species generated by photosensitized reactions. Furthermore, carotenoids are metabolized to apocarotenoids by oxidative cleavage. This review presents the current knowledge on fungal-specific carotenoids, their occurrence in different taxonomic groups, and their biosynthesis and conversion into trisporic acids. The outline of the different pathways was focused on the reactions and genes involved in not only the known pathways, but also suggested the possible mechanisms of reactions, which may occur in several non-characterized pathways in different fungi. Finally, efforts and strategies for genetic engineering to enhance or establish pathways for the production of various carotenoids in carotenogenic or non-carotenogenic yeasts were highlighted, addressing the most-advanced producers of each engineered yeast, which offered the highest biotechnological potentials as production systems.

Carotenoid Biosynthesis in Fusarium

Many fungi of the genus Fusarium stand out for the complexity of their secondary metabolism. Individual species may differ in their metabolic capacities, but they usually share the ability to synthesize carotenoids, a family of hydrophobic terpenoid pigments widely distributed in nature. Early studies on carotenoid biosynthesis in Fusariumaquaeductuum have been recently extended in Fusarium fujikuroi and Fusarium oxysporum, well-known biotechnological and phytopathogenic models, respectively. The major Fusarium carotenoid is neurosporaxanthin, a carboxylic xanthophyll synthesized from geranylgeranyl pyrophosphate through the activity of four enzymes, encoded by the genes carRA, carB, carT and carD. These fungi produce also minor amounts of β-carotene, which may be cleaved by the CarX oxygenase to produce retinal, the rhodopsin's chromophore. The genes needed to produce retinal are organized in a gene cluster with a rhodopsin gene, while other carotenoid genes are not linked. In the investigated Fusarium species, the synthesis of carotenoids is induced by light through the transcriptional induction of the structural genes. In some species, deep-pigmented mutants with up-regulated expression of these genes are affected in the regulatory gene carS. The molecular mechanisms underlying the control by light and by the CarS protein are currently under investigation.

Analysis of al-2 mutations in Neurospora

The orange pigmentation of the fungus Neurospora crassa is due to the accumulation of the xanthophyll neurosporaxanthin and precursor carotenoids. Two key reactions in the synthesis of these pigments, the formation of phytoene from geranylgeranyl pyrophosphate and the introduction of β cycles in desaturated carotenoid products, are catalyzed by two domains of a bifunctional protein, encoded by the gene al-2. We have determined the sequence of nine al-2 mutant alleles and analyzed the carotenoid content in the corresponding strains. One of the mutants is reddish and it is mutated in the cyclase domain of the protein, and the remaining eight mutants are albino and harbor different mutations on the phytoene synthase (PS) domain. Some of the mutations are expected to produce truncated polypeptides. A strain lacking most of the PS domain contained trace amounts of a carotenoid-like pigment, tentatively identified as the squalene desaturation product diapolycopene. In support, trace amounts of this compound were also found in a knock-out mutant for gene al-2, but not in that for gene al-1, coding for the carotene desaturase. The cyclase activity of the AL-2 enzyme from two albino mutants was investigated by heterologous expression in an appropriately engineered E. coli strain. One of the AL-2 enzymes, predictably with only 20% of the PS domain, showed full cyclase activity, suggesting functional independence of both domains. However, the second mutant showed no cyclase activity, indicating that some alterations in the phytoene synthase segment affect the cyclase domain. Expression experiments showed a diminished photoinduction of al-2 transcripts in the al-2 mutants compared to the wild type strain, suggesting a synergic effect between reduced expression and impaired enzymatic activities in the generation of their albino phenotypes.

A single five-step desaturase is involved in the carotenoid biosynthesis pathway to beta-carotene and torulene in Neurospora crassa

Phytoene desaturase Al-1 from Neurospora crassa was expressed in Escherichia coli and an active enzyme was isolated which catalyzed the stepwise introduction of up to five double bonds into the substrate phytoene. The major reaction products were 3, 4-didehydrolycopene and lycopene. Several of the desaturation intermediates, zeta-carotene, neurosporene, and lycopene, were also accepted as a substrate by Al-1. In contrast to the structurally related bacterial enzymes, the cofactor involved in the dehydrogenation reaction was NAD for Al-1. In situ competition with a neurosporene- and lycopene-converting hydratase and cyclase indicated that these enzymes can divert intermediates of the desaturation sequence. Based on the in vitro and in vivo results, the organization of the phytoene desaturase from N. crassa was proposed as an assembly of identical protein units which are responsible for the multistep reaction. However, the spatial arrangement should be loose enough to allow an exchange of individual intermediates in both directions in and out of this complex. Since gamma-carotene is not accepted as a substrate by Al-1, the formation of torulene must proceed exclusively by the cyclization of 3,4-didehydrolycopene.

Singlet oxygen is part of a hyperoxidant state generated during spore germination

We show that singlet oxygen is generated in asexual spores (conidia) from Neurospora crassa at the onset of germination. Oxidation of N. crassa catalase-1 (Cat-1) was previously shown to be caused by singlet oxygen (Lledías et al. J. Biol. Chem. 273, 1998). In germinating conidia, increased protein oxidation, decrease of total protein, Cat-1 oxidation and accumulation of cat-1 mRNA was detected. These changes were modulated in vivo by light intensity, an external clean source of singlet oxygen, and by carotene amount and content of coordinated double bonds. Conditions that stimulated singlet oxygen formation increased Cat-1 oxidation and accumulation of cat-1 mRNA. Germinating conidia from mutant strains altered in carotene synthesis showed increased levels of protein degradation, Cat-1 oxidation and accumulation of cat-1 mRNA. During germination Cat-1a was oxidized, oxidized Cat-1c-Cat-1e conformers disappeared and Cat-1a was synthesized de novo. Furthermore, spontaneous oxygen-dependent chemiluminescence increased as soon as conidia absorbed dissolved oxygen. Low-level chemiluminescence is due to photon emission from excited electrons in carbonyls and singlet oxygen as they return to their ground state. H2O2 added to conidia under Ar caused a peak of chemiluminescence and germination of 20% of conidia, suggesting that a hyperoxidant state suffices to start germination under anaerobic conditions. Taken together, these results show that singlet oxygen is part of a hyperoxidant state that develops at the start of germination of conidia, in consonance with our proposal that morphogenetic transitions occur as a response to a hyperoxidant state.

Microbial carotenoids

Carotenoids occur universally in photosynthetic organisms but sporadically in nonphotosynthetic bacteria and eukaryotes. The primordial carotenogenic organisms were cyanobacteria and eubacteria that carried out anoxygenic photosynthesis. The phylogeny of carotenogenic organisms is evaluated to describe groups of organisms which could serve as sources of carotenoids. Terrestrial plants, green algae, and red algae acquired stable endosymbionts (probably cyanobacteria) and have a predictable complement of carotenoids compared to prokaryotes, other algae, and higher fungi which have a more diverse array of pigments. Although carotenoids are not synthesized by animals, they are becoming known for their important role in protecting against damage by singlet oxygen and preventing chronic diseases in humans. The growth of aquaculture during the past decade as well as the biological roles of carotenoids in human disease will increase the demand for carotenoids. Microbial synthesis offers a promising method for production of carotenoids.

Functional identification of al-3 from Neurospora crassa as the gene for geranylgeranyl pyrophosphate synthase by complementation with crt genes, in vitro characterization of the gene product and mutant analysis

In this work the Neurospora crassa al-3 gene function was determined. Geranylgeranyl pyrophosphate (GGPP) synthase activity was measured in al-2 FGSC 313 and al-3 RP100 FGSC 2082 mutant strains by in vitro synthesis methods. This experiment showed that al-3 RP100 mutant expresses a reduced GGPP synthase activity. The mutated al-3 gene was cloned and sequenced; a single missense mutation was found changing serine into asparagine. Genetic complementation was performed by Escherichia coli transformation, with clusters of crt genes from Erwinia uredovora. Carotenoid accumulation was observed in E. coli transformants when the N. crassa al-3 gene substitutes the GGPP synthase gene (crtE) in the carotenogenic crt cluster. Cell-free studies with E. coli transformants gave direct evidence of the function of the al-3 protein as GGPP synthase and indicated that a short-chain prenylpyrophosphate, such as dimethylallyl pyrophosphate, is the genuine substrate.

Cloning, sequence, and photoregulation of al-1, a carotenoid biosynthetic gene of Neurospora crassa

Carotenoid biosynthesis is regulated by blue light during growth of Neurospora crassa mycelia. We have cloned the al-1 gene of N. crassa encoding the carotenoid-biosynthetic enzyme phytoene dehydrogenase and present an analysis of its structure and regulation. The gene encodes a 595-residue polypeptide that shows homology to two procaryotic carotenoid dehydrogenases. RNA measurements showed that the level of al-1 mRNA increased over 70-fold in photoinduced mycelia. Transcription run-on studies indicated that the al-1 gene was regulated at the level of initiation of transcription in response to photoinduction. The photoinduced increase of al-1 mRNA levels was not observed in two Neurospora mutants defective in all physiological photoresponses. Analysis of cosmid containing al-1 and of a translocation strain with a breakpoint within al-1 indicated that al-1 transcription proceeds towards the centromere of linkage group I of N. crassa.

Cloning, sequence, and photoregulation of al-1, a carotenoid biosynthetic gene of Neurospora crassa

Carotenoid biosynthesis is regulated by blue light during growth of Neurospora crassa mycelia. We have cloned the al-1 gene of N. crassa encoding the carotenoid-biosynthetic enzyme phytoene dehydrogenase and present an analysis of its structure and regulation. The gene encodes a 595-residue polypeptide that shows homology to two procaryotic carotenoid dehydrogenases. RNA measurements showed that the level of al-1 mRNA increased over 70-fold in photoinduced mycelia. Transcription run-on studies indicated that the al-1 gene was regulated at the level of initiation of transcription in response to photoinduction. The photoinduced increase of al-1 mRNA levels was not observed in two Neurospora mutants defective in all physiological photoresponses. Analysis of cosmid containing al-1 and of a translocation strain with a breakpoint within al-1 indicated that al-1 transcription proceeds towards the centromere of linkage group I of N. crassa.

Lipid composition of Neurospora crassa

The lipids of Neurospora crassa, isolated in pure form from freeze-dried mycelium, were found to contain squalene, sterol esters, triglycerides, free fatty acids, geranylgeraniol, free sterols, carotenoids, cardiolipin, phosphatidyl ethanolamine, phosphatidyl choline, phosphatidyl serine, and phosphatidic acid. The above compounds were isolated in pure form by column and thin layer chromatography and were characterized by infrared spectroscopy and chromatographic mobilities. Fatty acid moieties were characterized by gas liquid chromatographic retention times of their methyl esters relative to those of authentic standards. The fatty acid composition of the triglycerides was found to be similar to that of phosphatidic acid, cardiolipin, and lecithin.