High-temperature-requirement protein A (HtrA) family proteins play important roles in controlling protein quality and are recognized as virulence factors in numerous animal and human bacterial pathogens. The role of HtrA family proteins in plant pathogens remains largely unexplored. Here, we investigated the HtrA family protein, DegQ, in the crucifer black rot pathogen Xanthomonas campestris pathovar campestris (Xcc).
View Article and Find Full Text PDFSsrA and SmpB are known to play important roles in translational quality control and are essential for virulence in many human and animal pathogenic bacteria. The physiological roles and contribution of SsrA and SmpB to plant pathogen are unclear. Here, we present evidence to show that ssrA and smpB are involved in pathogenesis of Xanthomonas campestris pathovar campestris, the cause of black rot diseases in crucifers.
View Article and Find Full Text PDFAntonie Van Leeuwenhoek
May 2022
The caseinolytic protease (Clp) system is essential for survival under stress conditions and for virulence in several pathogenic bacteria. Xanthomonas campestris pv. campestris (Xcc) is a plant pathogen which causes black rot disease in crucifers.
View Article and Find Full Text PDFXanthomonas campestris pv. campestris is a bacterial pathogen and the causal agent of black rot in crucifers. In this study, a clpX mutant was obtained by EZ-Tn5 transposon mutagenesis of the X.
View Article and Find Full Text PDFBiofilm formation has been well known as a determinant of bacterial virulence. Group G Streptococcus dysgalactiae subspecies equisimilis (SDSE), a relevant pathogen with increasing medical importance, was evaluated for the biofilm-forming potential. Microtiter plate assay was used to assess the most feasible medium for group G SDSE to form a biofilm.
View Article and Find Full Text PDFXanthomonas campestris pv. campestris (Xcc) is the phytopathogen that causes black rot disease in cruciferous plants. The XCC2366 gene product is annotated as a protein belonging to the TetR family of transcriptional regulators.
View Article and Find Full Text PDFGram-negative phytopathogenic Xanthomonas campestris pv. campestris (Xcc) is the causal agent of black rot in crucifers. The ability of Xcc to incite this disease in plants depends on a number of factors, including exopolysaccharides, extracellular enzymes and biofilm production.
View Article and Find Full Text PDFStau2 is a lytic myophage of Staphylococcus aureus isolated from medical specimen. Exhibiting a broad host range against S. aureus clinical isolates, Stau2 is potentially useful for topical phage therapy or as an additive in food preservation.
View Article and Find Full Text PDFDistribution of virulence factors and association with emm polymorphism or isolation site among beta-hemolytic group G Streptococcus dysgalactiae subspecies equisimilis. Streptococcus dysgalactiae subspecies equisimilis (SDSE), the dominant human pathogenic species among group G streptococci, is the causative agent of several invasive and non-invasive diseases worldwide. However, limited information is available about the distribution of virulence factors among SDSE isolates, or their association with emm types and the isolation sites.
View Article and Find Full Text PDFUridine triphosphate (UTP)-glucose-1-phosphate uridylyltransferase (GalU; EC 2.7.7.
View Article and Find Full Text PDFBackground: The clinical impact of Chryseobacterium indologenes infection is increasing; nevertheless, most studies had been conducted in northern Taiwan, but rarely in central Taiwan.
Methods: Using 16S rRNA gene sequencing, 34 isolates of C. indologenes were identified at the Central Region Hospital Alliance between 2007 and 2011.
Background/purpose: Information concerning antibiotics susceptibilities of beta-hemolytic group G Streptococcus dysgalactiae subspecies equisimilis (SDSE) clinical isolates in central Taiwan was limited.
Methods: Totally, 246 SDSE isolates were collected from mainly five regional hospitals, from February 2007 to August 2011. Disk diffusion method, broth microdilution method, and clindamycin induction test (D test) were respectively performed according to the guidelines of the Clinical and Laboratory Standards Institute.
Diagn Microbiol Infect Dis
July 2014
Chryseobacterium gleum is not commonly isolated from clinical source(s). Using 16S rRNA gene sequencing, we identified 15 C. gleum isolates from the Central Region Hospital Alliance, Taiwan, which were all misidentified: 14 as Chryseobacterium indologenes and 1 as Elizabethkingia meningoseptica using the Vitek 2 GN card.
View Article and Find Full Text PDFBackground: The Non-homologous end-joining repair gene XRCC6/Ku70 plays an important role in the repair of DNA double-strand breaks (DSBs), and has been found to be involved in the carcinogenesis of many types of cancers including oral, prostate, breast and bladder cancer. However, the contribution of XRCC6 to childhood leukemia has yet to be studied. In the present study, we investigated the association of XRCC6 genotypes with the risk of childhood leukemia.
View Article and Find Full Text PDFThe Gram-negative plant pathogen Xanthomonas campestris pv. campestris (Xcc) is the causative agent of black rot in crucifers, a disease that causes tremendous agricultural loss. In this study, the Xcc galE gene was characterized.
View Article and Find Full Text PDFBackground: Elizabethkingia meningoseptica is an opportunistic pathogen. Identification of E. meningoseptica based on conventional methods is rather labor- and time-consuming.
View Article and Find Full Text PDFNo literature is available on the prevalence and clinical aspects of beta-haemolytic group G Streptococcus anginosus group in central Taiwan. In this study, we used 16S rRNA gene sequencing and 16S-23S rDNA intergenic spacer sequencing (where necessary) as the gold standard for molecular identification. Twenty-seven S.
View Article and Find Full Text PDFIn prokaryotes, two-component signal transduction systems, consisting of a histidine kinase and a response regulator, play a critical role in regulating a range of cellular functions. A recent study suggests that XCC3315, a response regulator with a CheY-like receiver domain attached to an uncharacterized HD-related output domain (HDOD domain), plays a role in the general stress response of the Gram-negative bacterium Xanthomonas campestris pv. campestris (Xcc), the causal agent of black rot in cruciferous plants.
View Article and Find Full Text PDFAppl Environ Microbiol
February 2011
In searching for an alternative antibacterial agent against multidrug-resistant Staphylococcus aureus, we have isolated and characterized a lytic staphylophage, Stau2. It possesses a double-stranded DNA genome estimated to be about 134.5 kb and a morphology resembling that of members of the family Myoviridae.
View Article and Find Full Text PDFThis study was conducted to detect the genes encoding extended-spectrum beta-lactamases (ESBLs) and determine the epidemiological relatedness of 69 Escherichia coli and 33 Klebsiella pneumoniae isolates collected from a regional hospital in central Taiwan, mostly from inpatients (E. coli 87.0%; K.
View Article and Find Full Text PDFL-Homophenylalanine (L-HPA) and N(6)-protected-2-oxo-6-amino-hexanoic acid (N(6)-protected-OAHA) can be used as building blocks for the manufacture of angiotensin-converting enzyme inhibitors. To synthesize L-HPA and N(6)-protected-OAHA simultaneously from 2-oxo-4-phenylbutanoic acid (OPBA) and N(6)-protected-L-lysine, several variants of Escherichia coli aspartate aminotransferase (AAT) were developed by site-directed mutagenesis and their catalytic activities were investigated. Three kinds of N(6)-protected-L-lysine were tested as potential amino donors for the bioconversion process.
View Article and Find Full Text PDFA dihydropyrimidinase gene (pydB) was cloned from the moderate thermophilic Brevibacillus agri NCHU1002 and expressed in Escherichia coli. The purified dihydropyrimidinase exhibited strict d-enantioselectivity for D,L-p-hydroxyphenylhydantoin and D,L-5-[2-(methylthio)ethyl]hydantoin, and non-enantiospecificity for D,L-homophenylalanylhydantoin (D,L-HPAH). The hydrolytic activity of PydB was enhanced notably by Mn2+, with a maximal activity at 60 degrees C and pH 8.
View Article and Find Full Text PDFL-Homophenylalanine (l-HPA) is a chiral unnatural amino acid used in the synthesis of angiotensin converting enzyme inhibitors and many pharmaceuticals. To develop a bioconversion process with dynamic resolution of N-acylamino acids for the l-HPA production, N-acylamino acid racemase (NAAAR) and l-aminoacylase (LAA) genes were cloned from Deinococcus radiodurans BCRC12827 and expressed in Escherichia coli XLIBlue. The recombinant enzymes were purified by nickel-chelate chromatography, and their biochemical properties were determined.
View Article and Find Full Text PDFSite-directed mutagenesis was performed to change the substrate specificity of Escherichia coli aspartate aminotransferase (AAT). A double mutant, R292E/L18H, with a 12.9-fold increase in the specific activity toward L-lysine and 2-oxo-4-phenylbutanoic acid (OPBA) was identified.
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