Journal of Microbiology

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Effects of Light and Dark Conditions on the Transcriptome of Aging Cultures of Candidatus Puniceispirillum marinum IMCC1322: Ji Hyen Lee, Hyun-Myung Oh; J. Microbiol. 2024;62(4):297-314. Published online April 25, 2024; DOI: https://doi.org/10.1007/s12275-024-00125-0

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To elucidate the function of proteorhodopsin in Candidatus Puniceispirillum marinum strain IMCC1322, a cultivated representative of SAR116, we produced RNA-seq data under laboratory conditions. We examined the transcriptomes of six different cultures, including sets of expression changes under constant dark (DD), constant light (LL), and diel-cycled (LD; 14 h light: 10 h dark) conditions at the exponential and stationary/death phases. Prepared mRNA extracted from the six samples was analyzed on the Solexa Genome Analyzer with 36 cycles. Differentially expressed genes on the IMCC1322 genome were distinguished as four clusters by K-mean clustering and each CDS (n = 2546) was annotated based on the KEGG BRITE hierarchy. Cluster 0 (n = 1573) covered most constitutive genes including proteorhodopsin, retinoids, and glycolysis/TCA cycle. Cluster 1 genes (n = 754) were upregulated in stationary/death phase under constant dark conditions and included genes associated with bacterial defense, membrane transporters, nitrogen metabolism, and senescence signaling. Cluster 2 genes (n = 197) demonstrated upregulation in exponential phase cultures and included genes involved in genes for oxidative phosphorylation, translation factors, and transcription machinery. Cluster 3 (n = 22) contained light-stimulated upregulated genes expressed under stationary/phases. Stringent response genes belonged to cluster 2, but affected genes spanned various cellular processes such as amino acids, nucleotides, translation, transcription, glycolysis, fatty acids, and cell wall components. The coordinated expression of antagonistic stringent genes, including mazG, ppx/gppA, and spoT/relA may provide insight into the controlled cultural response observed between constant light and constant dark conditions in IMCC1322 cultures, regardless of cell numbers and biomass.

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Culture-supported ecophysiology of the SAR116 clade demonstrates metabolic and spatial niche partitioning
Jordan T Coelho, Lauren Teubner, Michael W Henson, V Celeste Lanclos, Conner Y Kojima, J Cameron Thrash
The ISME Journal.2025;[Epub] CrossRef
Effect of Light Regime on Candidatus Puniceispirillum marinum IMCC1322 in Nutrient-Replete Conditions
Hyun-Myung Oh, Ji Hyen Lee, Ahyoung Choi, Sung-Hyun Yang, Gyung-Hoon Shin, Sung Gyun Kang, Jang-Cheon Cho, Hak Jun Kim, Kae-Kyoung Kwon
Journal of Microbiology and Biotechnology.2024;[Epub] CrossRef

Lactobacillus crispatus and its enolase and glutamine synthetase influence interactions between Neisseria gonorrhoeae and human epithelial cells: Jagoda Płaczkiewicz , Paulina Chmiel , Ewelina Malinowska , Pawel B&# , Agnieszka Kwiatek; J. Microbiol. 2020;58(5):405-414. Published online April 11, 2020; DOI: https://doi.org/10.1007/s12275-020-9505-9

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Abstract PDF

Neisseria gonorrhoeae, an obligatory human pathogen causes the sexually transmitted disease gonorrhea, which remains a global health problem. N. gonorrhoeae primarily infects the mucosa of the genitourinary tract, which in women, is colonized by natural microbiota, dominated by Lactobacillus spp., that protect human cells against pathogens. In this study, we demonstrated that precolonization of human epithelial cells with Lactobacillus crispatus, one of the most prevalent bacteria in the female urogenital tract, or preincubation with the L. crispatus enolase or glutamine synthetase impairs the adhesion and invasiveness of N. gonorrhoeae toward epithelial cells, two crucial steps in gonococcal pathogenesis. Furthermore, decreased expression of genes encoding the proinflammatory cytokines, TNFα and CCL20, which are secreted as a consequence of N. gonorrhoeae infection, was observed in N. gonorrhoeae-infected epithelial cells that had been precolonized with L. crispatus or preincubated with enolase and glutamine synthetase. Thus, our results indicate that the protection of human cells against N. gonorrhoeae infection is a complex process and that L. crispatus and its proteins enolase and glutamine synthetase can have a potential role in protecting epithelial cells against gonococcal infection. Therefore, these results are important since disturbances of the microbiota or of its proteins can result in dysbiosis, which is associated with increased susceptibility of epithelium to pathogens.

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Both Neisseria gonorrhoeae and Neisseria sicca Induce Cytokine Secretion by Infected Human Cells, but Only Neisseria gonorrhoeae Upregulates the Expression of Long Non-Coding RNAs
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Cindy Adapen, Louis Réot, Elisabeth Menu
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Alterations of Vaginal Microbiota in Women With Infertility and Chlamydia trachomatis Infection
Hongliang Chen, Li Wang, Lanhua Zhao, Lipei Luo, Shuling Min, Yating Wen, Wenbo Lei, Mingyi Shu, Zhongyu Li
Frontiers in Cellular and Infection Microbiology.2021;[Epub] CrossRef
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Research Support, Non-U.S. Gov'ts

Candida albicans ENO1 Null Mutants Exhibit Altered Drug Susceptibility, Hyphal Formation, and Virulence: Hui-Ching Ko , Ting-Yin Hsiao , Chiung-Tong Chen , Yun-Liang Yang; J. Microbiol. 2013;51(3):345-351. Published online June 28, 2013; DOI: https://doi.org/10.1007/s12275-013-2577-z

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Abstract PDF

We previously showed that the expression of ENO1 (enolase) in the fungal pathogen Candida albicans is critical for cell growth. In this study, we investigate the contribution of the ENO1 gene to virulence. We conducted our functional study of ENO1 in C. albicans by constructing an eno1/eno1 null mutant strain in which both ENO1 alleles in the genome were knockouted with the SAT1 flipper cassette that contains the nourseothricin-resistance marker. Although the null mutant failed to grow on synthetic media containing glucose, it was capable of growth on media containing yeast extract, peptone, and non-fermentable carbon sources. The null mutant was more susceptible to certain antifungal drugs. It also exhibited defective hyphal formation, and was avirulent in BALB/c mice.

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Enhanced Secretion of Cell Wall Bound Enolase into Culture Medium by the soo1-1 Mutation of Saccharomyces cerevisiae: Ki-Hyun Kim , Hee-Moon Park; J. Microbiol. 2004;42(3):248-252.; DOI: https://doi.org/2080 [pii]

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Abstract PDF: In order to identify the protein(s) secreted into culture medium by the soo1-1/ret1-1 mutation of Saccharomyces cerevisiae, proteins from the culture medium of cells grown at permissive (28^oC) and non-permissive temperatures (37^oC), were analyzed. Comparison of protein bands separated by SDS-PAGE identified a prominent band of 47-kDa band from a mutant grown at 37^oC. N-terminal amino acid sequencing of this 47-kDa protein showed high identity with enolases 1 and 2. Western blot analysis revealed that most of the cell wall-bound enolase was released into the culture medium of the mutant grown at 37^oC, some of which were separated as those with lower molecular weights. Our results, presented here, indicate the impairment of cell wall enolase biogenesis and assembly by the soo1-1/ret1-1 mutation of S. cerevisiae.

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