Secondary Metabolites of Mangrove-Associated Strains of Talaromyces

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Secondary Metabolites of Mangrove-Associated Strains of Talaromyces

This entry is adapted from the peer-reviewed paper 10.3390/md16010012

Boosted by the general aim of exploiting the biotechnological potential of the microbial component of biodiversity, research on the secondary metabolite production of endophytic fungi has remarkably increased. Novel compounds and bioactivities have resulted from this work, which has stimulated a more thorough consideration of various natural ecosystems as conducive contexts for the discovery of new drugs. Thriving at the frontier between land and sea, mangrove forests represent one of the most valuable areas in this respect.

bioactive products drug discovery endophytic fungi mangroves Talaromyces

1. Introduction

The establishment of the concept of ‘one fungus, one name’ in mycology ^[1] has stimulated reconsideration of the nomenclature of fungi, whose anamorphic stages were until recently grouped in the genus Penicillium, and included species renowned for being among the most prolific producers of bioactive secondary metabolites and a few blockbuster drugs ^[2]^[3]^[4]. In fact, a fundamental taxonomic revision has ultimately established that species with symmetrical biverticillate conidiophores, which were formerly ascribed to the Penicillium subgenus Biverticillium, are to be classified separately in the genus Talaromyces, and that Penicillium and Talaromyces belong to phylogenetic lineages that are distant enough to deserve ascription to different families ^[5]^[6]. Under the ecological viewpoint, recent reports are depicting a widespread endophytic occurrence of Talaromyces ^[7]^[8]^[9]^[10], which makes these fungi increasingly considered a source of interesting bioactive compounds.

After a few years, the above revision has not yet found full consideration. This is particularly true among researchers working in the field of drug discovery, who sometimes do not possess a robust mycological background. In fact, in a number of recent reports limiting identification to the genus level, the name Penicillium sp. is still inappropriately used for strains displaying the symmetrical biverticillate conidiophore condition. It is of course desirable that hasty investigators be more circumstantial in considering this fundamental step when reporting on their findings. Moreover, in contrast to the purpose of increasing accuracy, the adoption of identification procedures that are only based on DNA sequence homology has sometimes introduced additional approximation, considering that plenty of sequences referring to ‘Penicillium sp.’ have been deposited in GenBank, and are routinely used as a support for the incomplete classification of new strains. Pending the diffusion of more decisive identification protocols, a good portion of the work carried out so far in the field of the purification and characterization of secondary metabolites from Penicillium/Talaromyces strains awaits revision in order to attain a more conclusive taxonomic ascription of this biological material, and avoid possible confusion from unreliable information. In fact, data concerning the production of secondary metabolites can be quite informative for these fungi, particularly when they are indicative of the ability to synthesize some structural models that are only, or predominantly, found in Talaromyces ^[11]^[12].

2. Mangrove Swamps: A Dynamic Frontier between Land and Sea

Spread along the coastlines at tropical and subtropical latitudes, mangrove forests are a biodiversity hotspot as well as a peculiar transition ecosystem, harboring organisms that are typical of either marine or terrestrial habitats. Considering their prevalently emerged bearing, mangrove plants cannot be considered real marine organisms to the same extent as seagrasses ^[3]. However, they play a key role in maintaining and building soil from the intertidal zone, and are morphologically and physiologically adapted to the particularly harsh environmental conditions deriving from a combination of extensive salinity, tide alternation, anaerobic clayey soil, high temperature, and moisture ^[13].

Mangrove plants host a great variety of endophytic and other associated fungi, a good part of which derives from the surrounding soil, marine, and freshwater contexts. Regardless of their true origin, which in most instances cannot be proven, these symbionts might contribute to their host’s adaptation in such a peculiar habitat ^[14]. According to the plant species, the environmental conditions, and other factors, a wide set of interactions are potentially established between endophytes and their hosts ^[15]. However, the most considered aspect is represented by the mutual effects on the production of secondary metabolites. Recent investigations have demonstrated that these secondary metabolites are regulated by complex biomolecular mechanisms, such as chromatin methylation ^[16], and are regarded as fundamental mediators of interspecific communication ^[17]. In applicative terms, this intriguing ecological scenario reflects a series of bioactive properties of a multitude of structurally diverse compounds that these fungi are able to synthesize, stimulating their consideration as one of the most promising sources for drug prospects ^[14]^[18]^[19]^[20]^[21]^[22].

3. The Occurrence of Talaromyces Species in Mangroves

In the last decade, literature concerning drug discovery has been substantially enriched by many reports dealing with the biosynthetic potential of mangrove-associated fungi. Also, there has been an increasing trend over the past few years in the finding of Talaromyces strains from this particular ecological context, which appears to be in evident connection with its quite recent spread in nomenclatural use following the formal separation from Penicillium. However, apart from two cases from South America, these reports all refer to locations in southeast Asia, particularly from the Chinese provinces of Fujian, Guangdong, and Guangxi, and Hainan Island (Table 1).

Table 1. List of mangrove-associated Talaromyces strains gathered from the literature.

Species/Strain	Source	Location	Reference
T. aculeatus/9EB	Kandelia candel (leaf)	Yangjiang (Guangdong), China	^[23]
T. amestolkiae/YX1	Kandelia obovata (leaf)	Zhanjiang Mangrove Natural Reserve (Guangdong), China	^[24]
T. amestolkiae/HZ-YX1	K. obovata (leaf)	Huizhou Mangrove Natural Reserve (Guangdong), China	^[25]
T. atroroseus/IBT 20955	Laguncularia racemosa (root)	Paria Bay, Venezuela	^[26]
T. flavus/ CCTCCM2010266	Sonneratia apetala (leaf)	Hainan, China	^[27]
T. funiculosus	Avicennia officinalis (root) Rhizophora mucronata (root) undetermined species (leaf)	Pichavaram (Tamil Nadu), India	^[28]
T. pinophilus/HN29-3B1	Cerbera manghas	Dong Zhai Gang Mangrove Natural Reserve (Hainan), China	^[29]
T. pinophilus	Ceriops tagal (root)	Dong Zhai Gang (Hainan), China	^[30]
T. pinophilus	L. racemosa (leaf)	Itamaracá Island, Brazil	^[31]
T. purpurogenus/JP-1	Aegiceras corniculatum (bark)	Fujian, China	^[32]
Talaromyces sp./FJ-1 ¹	C. tagal (stem)	Haikou (Hainan), China	^[33]
Talaromyces sp./FJ-1 ¹	Avicennia marina	Fujian, China	^[34]
Talaromyces sp./FJ-1 ¹	Acanthus ilicifolius	Hainan, China	^[35]
Talaromyces sp./ZJ-SY2 ¹	S. apetala (leaf)	Zhanjiang Mangrove Natural Reserve (Guangdong), China	^[36]
Talaromyces sp./SBE-14	K. candel (bark)	Hong Kong, China	^[37]
Talaromyces sp./ZH154	K. candel (bark)	Zhuhai (Guangdong), China	^[38]
T. stipitatus/SK-4	A. ilicifolius (leaf)	Shankou Mangrove Natural Reserve (Guangxi), China	^[39]
T. trachyspermus/KUFA35	not specified	Thailand	^[40]

¹ These strains reported as Penicillium sp.

However, it is questionable whether some of these reports are actually replications. In fact, the strains YX1 and HZ-YX1 obtained from leaf samples of Kandelia obovata were claimed to have been collected in April 2012 at two locations in the Guangdong province situated over 400 km apart. Both strains were ascribed to the species T. amestolkiae based on rDNA-ITS sequence homology; nevertheless, the same GenBank accession code is indicated by the authors, which refers to Zhanjiang as the place of origin (hence strain YX1) ^[24]^[25]. Even more ambiguous is the case of strain 9EB of T. aculeatus, whose identification was again based on the homology of a 16S sequence of 576 bp deposited in GenBank (accession code: KT715695), which is actually referred to a strain of Penicillium sp. that had been given a different number (C08652) ^[23]. However, this sequence is identical to one from another strain (CY196, accession number: KP059103) identified as T. verruculosus, again submitted from Chinese researchers from Guangzhou. Finally, substantial perplexity arises for three strains labeled with the same number (FJ-1) despite a declared different origin, which are reported to have been identified through rDNA-ITS sequencing ^[33]^[34]^[35]. However, the GenBank code (DQ365947.1) provided for all of them actually corresponds to a previously deposited sequence from a strain of T. purpurogenus (HS-A82).

4. Structures and Properties of Secondary Metabolites from Manglicolous Talaromyces

Most of the strains mentioned in Table 1 were reported for the production/bioactive effects of secondary metabolites, which undoubtedly represent the major objective prompting research on endophytic fungi. The structure of these compounds was essentially elucidated by means of spectroscopic methods, such as two-dimensional (2D) NMR and mass spectrometry. In some cases, their absolute configuration was determined through a modified Mosher’s method or electronic circular dichroism (ECD) spectra, or the structures confirmed by means of single-crystal X-ray diffraction experiments. So far, 39 new compounds out of a total of 88 have resulted from the biochemical characterization of these strains. Aside from a few quite original structural models, most of them are strictly correlated to known products that have been previously reported from other strains of Talaromyces ^[2]^[3]^[11]. A lower number of compounds (22) already known from this genus have also been identified in manglicolous strains, indicating that research in this particular field has yielded a notable percentage of new products. However, it is not possible to infer whether these numbers subtend any specific biosynthetic abilities, considering that it is quite likely that a few novel products were not previously detected in strains of different origin by the simple reason that they had not been characterized yet.

The majority of these secondary metabolites have been evaluated for some kind of biological properties, particularly cytotoxic/antiproliferative activity against tumor cell lines, antimicrobial effects against bacterial and fungal strains, and immunosuppressive and enzyme inhibitory aptitudes. However, some interesting effects have been also described for many of the other 49 compounds previously reported from other biological sources.

As a likely result of evolutionary pressure, genes encoding fungal secondary metabolites are known to be clustered, and their synthesis is known to occur through a few common schemes, such as the acetate, shikimate, and mevalonate pathways ^[41]. Nevertheless, the molecular structure of these compounds is very varied, even within a single genus such as Talaromyces, and a convenient discussion should be based on their grouping in different classes ^[42].

Depsidones are ester-like depsides, or cyclic ethers, which are related to the diphenyl ethers, and synthesized through the polymalonate pathway. Their structure is based on an 11H-dibenzo(b,e) ^[1]^[4] dioxepin-11-one ring system where bridging at the phenolic group in the p-position can result in increased antioxidant activity. The efficient antioxidant properties of depsidones may also derive from their incorporation into lipid microdomains ^[43]. Since antioxidant properties are in turn related to anti-inflammatory, antiproliferative, and antiviral activities, compounds from Talaromyces spp. belonging to this class, particularly the novel talaromyones A and B ^[39], should be better investigated with reference to these bioactive effects. Funicones and the related vermistatins probably represent the most typical class of secondary metabolites produced by Talaromyces spp., possessing several bioactive properties that make them renowned drug prospects ^[44]. Particularly, 3-O-methylfunicone has displayed notable antifungal, antitumor, and lipid-lowering properties that require more circumstantial investigations beyond academic research, for which a direct support by the pharmaceutical industry seems to be fundamental ^[45]^[46]^[47]^[48]^[49]^[50].

Finally, the terpenes also appear to be quite infrequent from this particular microbial source. They include the sesquiterpene amino acid-alcohol ester purpuride ^[26], and a few novel cytotoxic-antiproliferative products, namely 15-hydroxy-6α,12-epoxy-7β,10αH,11βH-spiroax-4-ene-12-one ^[34], 15-α-hydroxy-(22E,24R)-ergosta-3,5,8(14),22-tetraen-7-one ^[35], and the talaperoxide series ^[27].

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