Publications by authors named "Cheol-Ho Hwang"

WRKY transcription factors (TFs) are involved in regulating a range of biological processes such as growth, development, and the responses to biotic and abiotic stresses. Genome-wide expression profiling of TF superfamily genes in rice after infection with pv. () was performed to elucidate the function of OsWRKY TFs in the interaction between rice and .

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To develop Pleurotus eryngii varieties with improved medicinal qualities, protoplasts of P. eryngii were mutagenized using 4-nitroquinoleneoxide. The effects of the resulting variant mushrooms on a human cell were evaluated by applying their aqueous extracts to the human hepatoma cell line, HepG2, in vitro and examining any alteration in the proteomes of the treated HepG2.

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Nitrogen compounds such as nitrate act as a potential inhibitor for legume nodulation. In this study, we isolated a new CLE gene, GmNIC2, from nitrate-treated roots, which shares high sequence homology with nitrate-induced CLE gene GmNIC1. Similar to GmNIC1, the expression level of GmNIC2 was not significantly altered in roots by rhizobial inoculation and was much higher in young nodules than in roots.

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A novel Gram-positive, anaerobic, and coccus-shaped bacterium, designated as strain ChDC B134(T), was isolated from a human postoperative infectious lesion in the right maxilla between the lateral incisor and canine and was characterized by polyphasic taxonomic analysis. 16S rRNA gene sequence analysis revealed that the strain ChDC B134(T) belonged to the genus Peptoniphilus, as it showed sequence similarities to Peptoniphilus indolicus KCTC 15023(T) (94.0 %) and Peptoniphilus asaccharolyticus KCTC 3321(T) (93.

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In this study, we classified the five strains (ChDC F128(T), ChDC F145, ChDC F174, ChDC F206, and ChDC F300) as a novel species of genus Fusobacterium by DNA-DNA hybridization and multi-locus phylogenetic analysis (MLPA), based on a single sequence (24,715 bp) of 22 concatenated housekeeping genes, with morphological and chemotaxonomic characteristics. DNA-DNA hybridization data showed that the values of genomic relatedness between ChDC F128(T) and each of the other novel strains were ranged from 79.0 to 82.

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In a previous study, an electrospun polyvinylidene fluoride (PVDF) nanofiber membrane was developed for Western blotting. The membrane exhibited high sensitivity and high binding capacity for the detection of protein bands that was unlike that observed for conventional, microphase separation-based porous PVDF membranes. Nevertheless, the PVDF nanofiber membrane is quite expensive.

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Electrospun polyvinylidene fluoride (PVDF) nanofiber membranes have 3-dementional (3-D) open pore channel and hence have excellent application potential in Western blot. In this study we have modified electrospun PVDF nanofiber membrane by argon (Ar) plasma treatment to improve the surface hydrophilic and detection sensitivity. The results showed that the detection sensitivity of the Ar plasma-treated PVDF nanofiber membrane increased with increasing plasma treatment time without the need for a methanol pre-wet step.

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The number of nodules formed in the roots of leguminous plants is systemically controlled by autoregulation of nodulation (AON). This study characterized two of the CLAVATA3/endosperm-surrounding region (CLE) genes involved in AON signal transduction. The GmRIC1 and GmRIC2 genes initiated expression solely in the roots at approximately 3 days after inoculation (DAI) with Nod factor-producing rhizobia, corresponding to the time point of AON, and the expression was up-regulated by cytokinins.

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Legumes have the ability to form root nodules that fix atmospheric nitrogen through a symbiotic interaction with nitrogen-fixing bacteria. As a first step in dissecting the molecular process of nodulation, proteome reference maps of soybean roots and nodules were constructed. Time course analysis revealed that the transition from root to nodule was accompanied with downregulation of defense-response related proteins, including Mn-superoxide dismutase, peroxidase (Prx), PR10, and stress-induced protein, leading to the initiation of a symbiotic interaction between the two partners.

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Article Synopsis
  • Soybeans show natural variation in flower and seed coat colors due to different anthocyanin pigments, but the specific genes involved are not fully known.
  • Researchers localized 8 enzyme-encoding gene families and a transcription factor within the soybean genome to understand the genetic basis behind these colors.
  • Their findings on the genetic mapping of crucial color-controlling genes could aid in developing marker-assisted breeding and future studies related to soybean pigmentation.
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A Capsicum annuum hypersensitive induced reaction protein1 (CaHIR1) was recently proposed as a positive regulator of hypersensitive cell death in plants. Overexpression of CaHIR1 in transgenic Arabidopsis plants conferred enhanced resistance against the hemi-biotrophic Pseudomonas syringae pv. tomato (Pst) and the biotrophic Hyaloperonospora parasitica.

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Molecular signaling interactions in the plant apoplast are important for defense and developmental responses. We examined the soybean proteome of the apoplastic conduit of root-to-shoot communication, the xylem stream, using gel electrophoresis combined with two types of tandem mass spectrometry. We examined soybeans for the presence of a Bradyrhizobium japonicum-induced, long distance developmental signal that controls autoregulation of nodulation (AON) to determine if xylem proteins (XPs) were involved directly or indirectly in AON.

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SUMMARY To understand the molecular basis of symbiotic association, a cDNA-AFLP technique was used to identify differentially expressed transcripts between a supernodulating soybean mutant, SS2-2, and its wild-type, Sinpaldalkong 2. As sources of cDNA-AFLP templates, trifoliates of 2-week-old plants were collected 1 week after Bradyrhizobium japonicum inoculation. A total of 147 bands out of 4000 amplicons were recognized as differentially expressed fragments, with 40 transcript-derived fragments (TDFs) in SS2-2 and 65 TDFs in Sinpaldalkong 2.

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Background: A simple and non-invasive methods for the diagnosis of transitional cell carcinoma of the bladder are needed for the prevention of invasive tumor. A proteomic technology has recently been developed to facilitate protein profiling of biological mixtures. We tried to detect the marker proteins by proteomic approach during the initiation stages on N-butyl-N-(4-hydroxybutyl) nitrosamine (BBN)-induced bladder carcinogenesis in rats.

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We investigated the pathophysiological mechanism by proteomic approach as a possible tool to detect the marker proteins to develop lower urinary tract symptoms following bladder outlet obstruction (BOO). Rats were randomized into 3 groups; control, sham operation and BOO groups. BOO group was divided into 1, 3, and 5 day-group.

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