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- Role of the LAMMER kinase LkhA in fungal development and aflatoxin production in Aspergillus flavus
- Seong-Hwan Jeong, He-Jin Cho, Jae-Hyuk Yu, Hee-Moon Park, Hee-Soo Park
- J. Microbiol. 2025;63(5):e2503007. Published online May 27, 2025
- DOI: https://doi.org/10.71150/jm.2503007
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Abstract
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A well-conserved LAMMER kinase in yeast and filamentous fungi, is a dual-specificity kinase with multiple roles in fungal biology. In this study, we assessed the roles of LkhA in Aspergillus flavus, a toxigenic fungus that produces aflatoxin B1. lkhA deletion mutants exhibited defects in fungal growth, conidiophore development, and sclerotia formation. These mutants exhibited impaired tolerance to oxidative and cell wall stresses. Moreover, the absence of lkhA resulted in a decrease in aflatoxin B1 production. The kernel assay revealed that the lkhA deletion mutants exhibited reduced production of conidia and aflatoxin B1, implying that LkhA can affect fungal toxigenesis and pathogenicity. Taken together, these results demonstrate that LkhA is important for differentiation, mycotoxin production, and pathogenicity in A. flavus.
- Transcriptomic Insights into Archaeal Nitrification in the Amundsen Sea Polynya, Antarctica
- Joo-Han Gwak , Samuel Imisi Awala , So-Jeong Kim , Sang-Hoon Lee , Eun-Jin Yang , Jisoo Park , Jinyoung Jung , Sung-Keun Rhee
- J. Microbiol. 2023;61(11):967-980. Published online December 7, 2023
- DOI: https://doi.org/10.1007/s12275-023-00090-0
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Abstract
- Antarctic polynyas have the highest Southern Ocean summer primary productivity, and due to anthropogenic climate change, these areas have formed faster recently. Ammonia-oxidizing archaea (AOA) are among the most ubiquitous and abundant microorganisms in the ocean and play a primary role in the global nitrogen cycle. We utilized metagenomics and metatranscriptomics to gain insights into the physiology and metabolism of AOA in polar oceans, which are associated with ecosystem functioning. A polar-specific ecotype of AOA, from the “Candidatus Nitrosomarinus”-like group, was observed to be dominant in the Amundsen Sea Polynya (ASP), West Antarctica, during a succession of summer phytoplankton blooms. AOA had the highest transcriptional activity among prokaryotes during the bloom decline phase (DC). Metatranscriptomic analysis of key genes involved in ammonia oxidation, carbon fixation, transport, and cell division indicated that this polar AOA ecotype was actively involved in nitrification in the bloom DC in the ASP. This study revealed the physiological and metabolic traits of this key polar-type AOA in response to phytoplankton blooms in the ASP and provided insights into AOA functions in polar oceans.
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- Alleviated photoinhibition on nitrification in the Indian Sector of the Southern Ocean
Lingfang Fan, Min Chen, Zifei Yang, Minfang Zheng, Yusheng Qiu
Acta Oceanologica Sinica.2024; 43(7): 52. CrossRef
- Alleviated photoinhibition on nitrification in the Indian Sector of the Southern Ocean
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