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De novo genome assembly and analysis of Zalaria sp. Him3, a novel fructooligosaccharides producing yeast

Abstract

Background

Zalaria sp. Him3 was reported as a novel fructooligosaccharides (FOS) producing yeast. However, Zalaria spp. have not been widely known and have been erroneously classified as a different black yeast, Aureobasidium pullulans. In this study, de novo genome assembly and analysis of Zalaria sp. Him3 was demonstrated to confirm the existence of a potential enzyme that facilitates FOS production and to compare with the genome of A. pullulans.

Results

The genome of Zalaria sp. Him3 was analyzed; the total read bases and total number of reads were 6.38 Gbp and 42,452,134 reads, respectively. The assembled genome sequence was calculated to be 22.38 Mbp, with 207 contigs, N50 of 885,387, L50 of 10, GC content of 53.8%, and 7,496 genes. g2419, g3120, and g3700 among the predicted genes were annotated as cellulase, xylanase, and β-fructofuranosidase (FFase), respectively. When the read sequences were mapped to A. pullulans EXF-150 genome as a reference, a small amount of reads (3.89%) corresponded to the reference genome. Phylogenetic tree analysis, which was based on the conserved sequence set consisting of 2,362 orthologs in the genome, indicated genetic differences between Zalaria sp. Him3 and Aureobasidium spp.

Conclusion

The differences between Zalaria and Aureobasidium spp. were evident at the genome level. g3700 identified in the Zalaria sp. Him3 likely does not encode a highly transfructosyl FFase because the motif sequences were unlike those in other FFases involved in FOS production. Therefore, strain Him3 may produce another FFase. Furthermore, several genes with promising functions were identified and might elicit further interest in Zalaria yeast.

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Background

Zalaria, a black yeast, was isolated from various sources, such as house dust, blackened wooden artwork, and dried sweet potato in North America, Italy, and Japan, respectively [1,2,3]. Recently, Zalaria sp. Him3 was reported as a novel fructooligosaccharides (FOS) producer [3] and hence it is an attractive candidate for industrial production of FOS. However, it is not known what enzymes or substances this species produces besides FOS. Moreover, Zalaria strains were incorrectly classified as Aureobasidium pullulans, which is another species of black yeast in the same order Dothideales, and were required re-identification of Zalaria spp. [1]. This incorrect classification is also due to the fact that both species produce a melanin pigment when grown on agar media, which makes it difficult to distinguish them by their appearance alone [1, 3, 4].

A. pullulans has several applications in the biotechnological industry because the yeast produces various industrially important materials, such as pullulan, β-glucan, and FOS [5,6,7]. Pullulan and β-glucan are utilized for the production of oxygen-impermeable films and for its immunostimulant effects, respectively [5, 6, 8]. FOS, on the other hand, contributes to modulate the human gastrointestinal microbiota and is hence used as a prebiotic [9]. Additionally, some A. pullulans strains have been considered as biocontrol agents for crop protection to exhibit a strong inhibitory effect on plant pathogenic bacteria [10].

To the best of our knowledge, the genomes of most Zalaria spp. have not been analyzed unlike those of A. pullulans [4]. Furthermore, the available information on this species is limited because bioengineering studies using Zalaria have only focused on FOS production. Therefore, analysis of its genome would enhance our understanding of this yeast species and elucidate the expression of various enzymes and allow for comparison with other yeast species.

In the present study, de novo genome assembly and genome analysis of Zalaria sp. Him3 were demonstrated. Furthermore, its genome sequence was compared with that of Aureobasidium spp. as references to clarify the genetic differences between the two yeast species.

Results

De novo genome assembly of Zalaria sp. Him3

The genome information of Zalaria spp. has not been investigated in detail. This is the first study to analyze the genome of Zalaria sp. Him3, a FOS producing yeast strain. The total bases and total number of reads in the raw data were 6.48 Gbp and 42,883,258 reads, respectively. The Q30 score, which is the ratio of bases that have a Phred quality score greater than 30, was 92.3%. The raw data were trimmed using Cutadapt [11], and the total base of 6.38 Gbp and the total read of 42,452,134 reads were obtained. FastQC analysis did not identify any issues with the sequence quality. The assembled genome sequence calculated using QUAST [12] was found to be 22.38 Mbp with 207 contigs, N50 of 885,387, L50 of 10, GC content of 53.8%, and 7,496 genes (Table 1). The genome coverage of the total sequenced bases (6.38 Gbp) was 285-fold of the genome size (22.38 Mbp). The quality assessment of the genome assembly was performed using BUSCO [13], and the completed BUSCO value in the data set of dothideomycetes_odb10 was 84.7% (3207 of 3786 genes). The predicted transcripts in the contigs (4022 genes) were annotated with BLAST search (Table S1). Among these transcripts, g3700 in contig NODE 9 was annotated as β-fructofuranosidase (FFase), which shared 73% sequence identity with that of Diplodia corticola CBS 112549 (DcFFase). Multiple alignments were constructed with the amino acid sequences of FFase from Aureobasidium melanogenum 11 − 1 (AmFFase) [14] and FFase from Aspergillus niger ATCC 20611 (AnFFase) [15], which are highly transfructosyl enzymes, in addition to DcFFase and the deduced amino acid sequence of g3700 (Fig. 1). These amino acid sequences were not highly conserved. Otherwise, g2419 and g3120 in the predicted transcripts were annotated as cellulase and xylanase, respectively, which are also carbohydrate degrading enzymes. Furthermore, gene clusters responsible for secondary metabolite production in the draft genome were identified by antiSMASH [16]. The regions from 255,015 to 301,675 in NODE 9 and 208,530 to 230,840 in NODE 16 corresponded with a melanin biosynthesis cluster in Bipolaris oryzae (Minimum Information about a Biosynthetic Gene cluster [MIBiG] accession: BGC0001265) and a clavaric acid biosynthesis cluster in Hypholoma sublateritium (MIBiG accession: BGC0001248), respectively.

Fig. 1
figure 1

Multiple alignment with amino acids sequences of β-fructofuranosidase. The g3700 sequence was deduced from the transcript of Zalaria sp. Him3 genome. DcFFase, AmFFase, and AnFFase were β-fructofuranosidase in Aureobasidium melanogenum 11 − 1, Aspergillus niger ATCC 20611, and Diplodia corticola CBS 112549, respectively. The active sites predicted from AmFFase are indicated in bold. The conserved residues are indicated with an asterisk

Table 1 Statistics of de novo genome assembly of Zalaria sp. Him3

Comparison of Zalaria sp. Him3 genome sequence with Aureobasidium spp. genome as a reference

An extensive comparison of orthologs between the genome of Zalaria and Aureobasidium has not been reported. Moreover, it is difficult to distinguish between Zalaria and Aureobasidium spp. based on their appearance alone because both are black yeasts. Only 3.89% reads from strain Him3 were mapped to the genome of A. pullulans EXF-150 [4], suggesting substantial divergence between the two genomes. The genome size (29.62 Mbp) of the strain EXF-150 was larger than that of the strain Him3 (22.34 Mbp). The GC contents of Zalaria sp. Him3 and A. pullulans EXF-150 were 53.8% and 50.0%, respectively. Phylogenetic tree analysis based on the concatenated sequence set consisting of 2,362 orthologs was performed for Zalaria sp. Him3, Myriangium duriaei CBS 260.36, and 8 strains of Aureobasidium spp. The average sequence identity for the 2362 orthologs was 81.0%. As shown in Fig. 2, the strain Him3 was found to be genetically distant from Aureobasidium spp. This result suggested that there were differences between the two yeast species at the genome level.

Fig. 2
figure 2

Phylogenetic tree analysis based on 2,362 orthologous sequences of Zalaria sp. Him3 and Aurebasidium spp. M. duriaei was used as an outgroup. Accession numbers are indicated in parentheses. Gene-support frequencies were calculated with reference to Salichos and Rokas [29]

Discussion

When sequences of the internal transcribed spacer region from strains of Aureobasidium and Zalaria spp. were compared by phylogenetic analysis, a portion of Zalaria strains was located in the A. pullulans clade [1, 3]. Humphries et al. reported that the strain ATCC 16628 was originally recognized as A. pullulans but was re-identified as Zalaria obscura [1]. The identification of Zalaria was insufficient because this yeast is a relatively new genus. An accurate classification of the Zalaria spp. is required to improve our understanding of this yeast species for future industrial applications. In the present study, genomic comparison revealed that Zalaria sp. Him3 has little genetic similarity with Aureobasidium spp. (Fig. 2), and this finding was also supported by the genome mapping rate. This result proved that there was a significant genetic difference between the two yeasts, Zalaria and Aureobasidium, and that the independency of the genus Zalaria was confirmed.

This is the first study to perform genome analysis of Zalaria sp. Him3. FFase gene (g3700) was identified from the predicted transcripts in the draft genome sequence. FFase is an important enzyme for the production of FOS [3]. A. pullulans DSM 2404 expresses multiple FFases for FOS production, and FFase I and IV showed high transfructosylating and hydrolytic activities, respectively [17]. Only g3700 was found in the Him3 genome, and this FFase gene did not exhibit high similarity with the high transfructosyl FFase, AmFFase and AnFFase (Fig. 1). The motifs (GQIGDP, RDP, and FET) for transfructosyl activity in GH32 FFase were previously reported in neighboring residues of the active sites [14, 18]. g3700 had the motifs for hydrolytic activity (WMNDPNGL, RDP, and ECP), although this enzymatic activity was not tested. Therefore, Zalaria sp. Him3 might express a different type of transfructosyl FFase, which might be important for FOS production. This yeast species might potentially play a role in biomass degradation [19] because g2419 and g3120 reportedly encode cellulase and xylanase, respectively. In terms of secondary metabolites, Zalaria spp. was suggested to possess the active gene cluster for melanin production because this yeast formed a melanotic colony when grown on agar media [1, 3]. Clavaric acid was reported to exert antitumor activity [20], and the related gene cluster was identified in the strain Him3, although that production has still not been confirmed. The present genome analysis may not be the best, but several promising genes were identified. This result could be expected to promote further analysis as a novel criterion for Zalaria yeast.

Conclusion

In the present study, we performed de novo genome assembly of Zalaria sp. Him3. Phylogenetic analysis was performed for the concatenated 2,362 orthologous sequences, and the difference between Aureobasidium spp. and strain Him3 was evident. FFase gene (g3700) related to FOS production was annotated from the genome sequence, but the motif sequence suggested that the enzyme has a hydrolytic activity. This finding suggests that Zalaria sp. Him3 may produce a different type of FFase that facilitates FOS production. Additionally, genes related to carbohydrate degrading enzymes and secondary metabolites were also identified. These results extend the scope for further analysis of Zalaria spp. and highlight the potential of this yeast for various industrial applications.

Methods

Strain

Zalaria sp. Him3 strain was isolated from a Japanese dried sweet potato [3]. It was cultured on Yeast extract Peptone Dextrose (YPD) agar medium (2% glucose, 1% yeast extract, 2% polypeptone, and 1.5% agar) at 30 °C.

Genome sequencing

Zalaria sp. Him3 strain, grown on YPD agar medium, was suspended in 10 mM Tris-HCl buffer (pH 8.0) containing 1 mM ethylenediaminetetraacetic acid, and the cell pellet was collected by centrifugation at 20,000 × g for 1 min. Genomic DNA was prepared using Dr. GenTLE (from Yeast) High Recovery Kit (Takara Bio Inc, Shiga, Japan). Approximately 1.5 µg of DNA was subjected to whole-genome sequencing. The DNA libraries were prepared using TruSeq DNA PCR-Free (Illumina, San Diego, CA, USA) according to the protocol. The prepared library was sequenced at 2 × 151 bp on NovaSeq 6000 (Illumina). Removal of the adapter sequences, sequences of less than 21 base reads, and other unwanted sequences, was performed for the sequenced paired-end reads using Cutadapt ver. 2.10 [11]. The trimmed data quality was validated with FastQC ver. 0.11.9 (Babraham Bioinformatics, Cambridge, UK; https://www.bioinformatics.babraham.ac.uk/projects/fastqc).

Genome assembly and gene prediction

The trimmed data for Zalaria sp. Him3 genome was assembled using SPAdes ver. 3.14.1 [21] and mapped to the contigs with Burrows-Wheeler Aligner ver. 0.7.17 [22]. The contig sequences were improved for base differences and gaps with Pilon ver. 1.23 [23]. The genome assemble quality was validated with QUAST ver. 5.0.2 [12]. After coding sequences were identified from the contig sequences using AUGUSTUS ver. 3.3.3 [24] based on the A. pullulans genome sequence (txid1043002), the predicted transcripts were annotated using nucleotide BLAST with the NCBI Reference Sequence Database (RefSeq_rna). The coding sequences predicted using AUGUSTUS were evaluated with BUSCO ver. 4.1.3 [13], and the data set of dothideomycetes_odb10, orthologous genes from 45 species of the class Dothideomycetes in OrthoDB (https://www.orthodb.org), was used. Multiple alignments were constructed with translated sequences of g3700, DcFFase (accession number: XM_020274717), AmFFase (accession number: MH626577), and AnFFase (accession number: AB046383) using ClustalW program (https://www.genome.jp/tools-bin/clustalw). Gene clusters responsible for secondary metabolite production in the contig sequences were predicted using antiSMASH ver. 6.0.1 [16].

Mapping of Zalaria sp. Him3 genome sequence to A. pullulans genome

The read data for Zalaria sp. Him3 were mapped to the A. pullulans EXF-150 genome (accession number: GCA_000721785.1) as a reference sequence using the Burrows-Wheeler Aligner ver. 0.7.17 [21]. The mapping rate was evaluated using Qualimap ver. 2.2.1 [25].

Phylogenetic tree analysis

A phylogenetic tree based on the genome was constructed using RAxMLver. 8.2.2 [26]. The common 2,362 orthologous sequences were used for the analysis. Orthologous sets were identified from the genome sequences of Zalaria sp. Him3, Aureobasidium meianogenum CBS 110374 (accession number: GCF_000721775.1), Aureobasidium mustum (accession number: GCA_903819665.1), Aureobasidium namibiae CBS 147.97 (accession number: GCA_000721765.1), A. pullulans EXF-150 (accession number: GCF_000721785.0), Aureobasidium subglaciale EXF-2481 (accession number: GCF_000721755.1), Aureobasidium uvarum (accession number: GCA_903853725.1), Aureobasidium vineae (accession number: GCA_903819635.1), and Aureobasidium sp. EXF-3399 (accession number: GCA_019924955.1) using protein BLAST [27] as described by Matsutani et al. [28]. Furthermore, the orthologs were concatenated and analyzed after the alignment gaps of each sequence were removed. The gene-support frequency was calculated as described by Salichos and Rokas [29]. The sequence of M. duriaei CBS 260.36 (accession number: GCA_010093895.1) was used as an outgroup.

Availability of data and materials

The datasets generated and/or analyzed during the current study are available in the DNA data bank of Japan (DDBJ, Shizuoka, Japan) repository. The accession numbers are: BPUN01000001–BPUN01000207 and the BioProject accession PRJDB12057.

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Acknowledgements

We would like to thank the MOGERA-sequencer service of Tohoku Chemical Co., Ltd. (Hirosaki, Japan) for the genome sequence and annotation of Zalaria sp. Him3.

Funding

No funding was received in this study.

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Authors and Affiliations

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Contributions

JY designed and mainly performed the study. MiM performed the genome analysis. MaM, YK, and KM supported the study. All the authors reviewed and approved the submitted manuscript.

Corresponding author

Correspondence to Jun Yoshikawa.

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Supplementary Information

Additional file 1: Table S1.

Gene annotation in predicted transcripts of Zalaria sp. Him3.

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Yoshikawa, J., Matsutani, M., Maeda, M. et al. De novo genome assembly and analysis of Zalaria sp. Him3, a novel fructooligosaccharides producing yeast. BMC Genom Data 23, 78 (2022). https://doi.org/10.1186/s12863-022-01094-2

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