Journal of Microbiology

In-Gyu Choi

6 Articles

Degradation and polymerization of monolignols by Abortiporus biennis, and induction of its degradation with a reducing agent: Chang-Young Hong , Se-Yeong Park , Seon-Hong Kim , Su-Yeon Lee , Won-Sil Choi , In-Gyu Choi; J. Microbiol. 2016;54(10):675-685. Published online September 30, 2016; DOI: https://doi.org/10.1007/s12275-016-6158-9

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This study was carried out to better understand the characteristic modification mechanisms of monolignols by enzyme system of Abortiporus biennis and to induce the degradation of monolignols. Degradation and polymerization of monolignols were simultaneously induced by A. biennis. Whole cells of A. biennis degraded coniferyl alcohol to vanillin and coniferyl aldehyde, and degraded sinapyl alcohol to 2,6-dimethoxybenzene- 1,4-diol, with the production of dimers. The molecular weight of monolignols treated with A. biennis increased drastically. The activities of lignin degrading enzymes were monitored for 24 h to determine whether there was any correlation between monolignol biomodification and ligninolytic enzymes. We concluded that complex enzyme systems were involved in the degradation and polymerization of monolignols. To degrade monolignols, ascorbic acid was added to the culture medium as a reducing agent. In the presence of ascorbic acid, the molecular weight was less increased in the case of coniferyl alcohol, while that of sinapyl alcohol was similar to that of the control. Furthermore, the addition of ascorbic acid led to the production of various degraded compounds: syringaldehyde and acid compounds. Accordingly, these results demonstrated that ascorbic acid prevented the rapid polymerization of monolignols, thus stabilizing radicals generated by enzymes of A. biennis. Thereafter, A. biennis catalyzed the oxidation of stable monolignols. As a result, ascorbic acid facilitated predominantly monolignols degradation by A. biennis through the stabilization of radicals. These findings showed outstanding ability of A. biennis to modify the lignin compounds rapidly and usefully.

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A novel promising laccase from the psychrotolerant and halotolerant Antarctic marine Halomonas sp. M68 strain
Melissa Bisaccia, Elisa Binda, Elena Rosini, Gabriella Caruso, Ombretta Dell'Acqua, Maurizio Azzaro, Pasqualina Laganà, Gabriella Tedeschi, Elisa M. Maffioli, Loredano Pollegioni, Flavia Marinelli
Frontiers in Microbiology.2023;[Epub] CrossRef
Investigation of Abortiporus biennis lignocellulolytic toolbox, and the role of laccases in polystyrene degradation
Anastasia Zerva, Romanos Siaperas, George Taxeidis, Maria Kyriakidi, Stamatina Vouyiouka, Georgios I. Zervakis, Evangelos Topakas
Chemosphere.2023; 312: 137338. CrossRef
Bioremediation of lignin derivatives and phenolics in wastewater with lignin modifying enzymes: Status, opportunities and challenges
Anil Kumar Singh, Muhammad Bilal, Hafiz M.N. Iqbal, Anne S. Meyer, Abhay Raj
Science of The Total Environment.2021; 777: 145988. CrossRef
Characterization and use of a bacterial lignin peroxidase with an improved manganese-oxidative activity
Elisa Vignali, Fabio Tonin, Loredano Pollegioni, Elena Rosini
Applied Microbiology and Biotechnology.2018; 102(24): 10579. CrossRef
Phanerochaete chrysosporium Multienzyme Catabolic System for in Vivo Modification of Synthetic Lignin to Succinic Acid
Chang-Young Hong, Sun-Hwa Ryu, Hanseob Jeong, Sung-Suk Lee, Myungkil Kim, In-Gyu Choi
ACS Chemical Biology.2017; 12(7): 1749. CrossRef

Biotransformation of (-)-α-pinene and geraniol to α-terpineol and p-menthane-3,8-diol by the white rot fungus, Polyporus brumalis: Su-Yeon Lee , Seon-Hong Kim , Chang-Young Hong , Se-Yeong Park , In-Gyu Choi; J. Microbiol. 2015;53(7):462-467. Published online June 27, 2015; DOI: https://doi.org/10.1007/s12275-015-5081-9

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In this study, the monoterpenes, α-pinene and geraniol, were biotransformed to synthesize monoterpene alcohol compounds. Polyporus brumalis which is classified as a white rot fungus was used as a biocatalyst. Consequently α-terpineol was synthesized from α-pinene by P. brumalis mycelium, after three days. Moreover, another substrate, the acyclic monoterpenoids geraniol was transformed into the cyclic compound, p-menthane-3, 8-diol (PMD). The main metabolites, i.e., α-terpineol and PMD, are known to be bioactive monoterpene alcohol compounds. This study highlights the potential of fungal biocatalysts for monoterpene transformation.

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Transcriptomic analysis of the white rot fungus Polyporus brumalis provides insight into sesquiterpene biosynthesis
Su-Yeon Lee, Myungkil Kim, Seon-Hong Kim, Chang-Young Hong, Sun-Hwa Ryu, In-Gyu Choi
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Inhibitory Effect of the Essential Oil from Chamaecyparis obtusa on the Growth of Food-Borne Pathogens: Mi-Jin Park , Won-Sil Choi , Ha-Young Kang , Ki-Seob Gwak , Geun-Shik Lee , Eui-Bae Jeung , In-Gyu Choi; J. Microbiol. 2010;48(4):496-501. Published online August 20, 2010; DOI: https://doi.org/10.1007/s12275-010-9327-2

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In this study, the antibacterial activity of essential oil from Chamaecyparis obtusa (Sieb. et Zucc) leaves and twigs was investigated. The test strains were Klebsiella pneumoniae, Listeria monocytogenes, Salmonella typhimurium, Staphylococcus aureus, Escherichia coli, Legionella pneumophila, and Methicilline-resistant Staphylococcus aureus. Antibacterial activity was estimated by measuring bacterial growth inhibition. Histopathological examination was also performed. C. obtusa oil distinctly inhibited the growth of all test strains and exhibited the strongest antibacterial activity against L. monocytogenes. It was chromatographically divided into several fractions. The fractions were further tested against antibacterial activity and their chemical compositions were analyzed. The fraction containing terpinen-4-ol (TA) showed high antibacterial activity toward all strains tested. Tests with authentic samples showed that TA played a major role in the antibacterial activity of C. obtusa oil, and in a mice test, the oil actively minimized inflammation by S. aureus.

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Biological Pretreatment of Softwood Pinus densiflora by Three White Rot Fungi: Jae-Won Lee , Ki-Seob Gwak , Jun-Yeong Park , Don-Ha Choi , Mi Kwon , In-Gyu Choi; J. Microbiol. 2007;45(6):485-491.; DOI: https://doi.org/2647 [pii]

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Abstract PDF: The effects of biological pretreatment on the Japanese red pine Pinus densiflora, was evaluated after exposure to three white rot fungi Ceriporia lacerata, Stereum hirsutum, and Polyporus brumalis. Change in chemical composition, structural modification, and their susceptibility to enzymatic saccharification in the degraded wood were analyzed. Of the three white rot fungi tested, S. hirsutum selectively degraded the lignin of this sortwood rather than the holocellulose component. After eight weeks of pretreatment with S. hirsutum, total weight loss was 10.7%, while lignin loss was the highest at 14.52% among the tested samples. However, holocellulose loss was lower at 7.81% compared to those of C. lacerata and P. brumalis. Extracelluar enzymes from S. hirsutum showed higher activity of ligninase and lower activity of cellulase than those from other white rot fungi. Thus, total weight loss and changes in chemical composition of the Japanese red pine was well correlated with the enzyme activities related with lignin- and cellulose degradation in these fungi. Based on the data obtained from analysis of physical characterization of degraded wood by X-ray Diffractometry (XRD) and pore size distribution, S. hirsutum was considered as an effective potential fungus for biological pretreatment. In particular, the increase of available pore size of over 120 nm in pretreated wood powder with S. hirsutum made enzymes accessible for further enzymatic saccharification. When Japanese red pine chips treated with S. hirsutum were enzymatically saccharified using commercial enzymes (Cellulclast 1.5 L and Novozyme 188), sugar yield was greatly increased (21.01%) compared to non-pretreated control samples, indicating that white rot fungus S. hirsutum provides an effective process in increasing sugar yield from woody biomass.

Antifungal Activities of the Essential Oils in Syzygium aromaticum (L.) Merr. Et Perry and Leptospermum petersonii Bailey and their Constituents against Various Dermatophytes: Mi-Jin Park , Ki-Seob Gwak , In Yang , Won-Sil Choi , Hyun-Jin Jo , Je-Won Chang , Eui-Bae Jeung , In-Gyu Choi; J. Microbiol. 2007;45(5):460-465.; DOI: https://doi.org/2589 [pii]

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Abstract PDF: This study was carried out in order to investigate the potential of using plant oils derived from Leptospermum petersonii Bailey and Syzygium aromaticum L. Merr. Et Perry as natural antifungal agents. The antifungal effects of essential oils at concentrations of 0.05, 0.1, 0.15, and 0.2 mg/ml on the dermatophytes Microsporum canis (KCTC 6591), Trichophyton mentagrophytes (KCTC 6077), Trichophyton rubrum (KCCM 60443), Epidermophyton floccosum (KCCM 11667), and Microsporum gypseum were evaluated using the agar diffusion method. The major constituents of the active fraction against the dermatophytes were identified by gas chromatography-mass spectrometry and high-performance liquid chromatography analysis. The antifungal activities of S. aromaticum oil (clove oil) against the dermatophytes tested were highest at a concentration of 0.2 mg/ml, with an effectiveness of more than 60%. Hyphal growth was completely inhibited in T. mentagrophytes, T. rubrum, and M. gypseum by treatment with clove oil at a concentration of 0.2 mg/ml. Eugenol was the most effective antifungal constituent of clove oil against the dermatophytes T. mentagrophytes and M. canis. Morphological changes in the hyphae of T. mentagrophytes, such as damage to the cell wall and cell membrane and the expansion of the endoplasmic reticulum, after treatment with 0.11 mg/ml eugenol were observed by transmission electron microscopy (TEM). At a concentration of 0.2 mg/ml, L. petersonii oil (LPO) was more than 90% effective against all of the dermatophytes tested, with the exception of T. rubrum. Geranial was determined to be the most active antifungal constituent of L. petersonii oil. Taken together, the results of this study demonstrate that clove and tea tree oils exhibited significant antifungal activities against the dermatophytes tested in this study.

Estrogenic Reduction of Styrene Monomer Degraded by Phanerochaete chrysosporium KFRI 20742: Jae-Won Lee , Soo-Min Lee , Eui-Ju Hong , Eui-Bae Jeung , Ha-Young Kang , Myung-Kil Kim , In-Gyu Choi; J. Microbiol. 2006;44(2):177-184.; DOI: https://doi.org/2367 [pii]

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Abstract PDF: The characteristic biodegradation of monomeric styrene by Phanerochaete chrysosporium KFRI 20742, Trametes versicolor KFRI 20251 and Daldinia concentrica KFRI 40-1 was carried out to examine the resistance, its degradation efficiency and metabolites analysis. The estrogenic reduction effect of styrene by the fungi was also evaluated. The mycelium growth of fungi differentiated depending on the concentration levels of styrene. Additionally P. chrysosporium KFRI 20742 showed superior mycelium growth at less than 200 mg/l, while D. concentrica KFRI 40-1 was more than 200 mg/l. The degradation efficiency reached 99% during one day of incubation for all the fungi. Both manganese-dependent peroxidase and laccase activities in liquid medium were the highest at the initial stage of incubation, whereas the lowest was after the addition of styrene. However, both activities were gradually recovered after. The major metabolites of styrene by P. chrysosporium KFRI 20742 were 2-phenyl ethanol, benzoic acid, cyclohexadiene-1,4-dione, butanol and succinic acid. From one to seven days of incubating the fungi, the expression of pS2 mRNA widely known as an estrogen response gene was decreased down to the level of baseline after one day. Also, the estrogenic effect of styrene completely disappeared after treatment with supernatant of P. chrysosporium KFRI 20742 from one week of culture down to the levels of vehicle.

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