12 research outputs found
MOESM1 of Process optimization for enhancing production of cis-4-hydroxy-l-proline by engineered Escherichia coli
Additional file 1. Additional tables and figures
MOESM1 of Process optimization for enhancing production of cis-4-hydroxy-l-proline by engineered Escherichia coli
Additional file 1. Additional tables and figures
Sensing in 15 s for Aqueous Fluoride Anion by Water-Insoluble Fluorescent Probe Incorporating Hydrogel
Anion recognition and sensing via
artificial receptors have attracted
a great deal of attention since they play a fundamental and important
role in chemical, biological, medical, and environmental processes.
Fluoride, as one of the smallest anions, is of particular interest
because of its role in dental care and the analysis of drinking water.
Herein, we invented a new method for F<sup>–</sup> detection
by adopting the hydrogel as the supporter of reaction between a water
insoluble fluorescent probe and F<sup>–</sup> in the water
environment. This method is highly rapid, selective, and sensitive,
which can determine F<sup>–</sup> levels in 15 s at the drinking
water standard. A novel compound <i>N</i>-(3-(benzoÂ[d]Âthiazol-2-yl)-4-(tert-butyldiphenylsilyloxy)Âphenyl)
acetamide (BTBPA) was synthesized as the fluorescent probe because
of the significant fluorescent color change from blue to green after
the reaction with F<sup>–</sup>. This method does not require
the probe substances to be water-soluble, which greatly expands the
range of the specific fluorescent molecules used in ion detection.
Additionally, just a few microliter samples were required in the analysis
procedures with this method
Table_1_Characterization and genome analysis of phage vB_KpnS_SXFY507 against Klebsiella pneumoniae and efficacy assessment in Galleria mellonella larvae.XLS
Carbapenem-resistant Klebsiella pneumoniae is one of the primary bacterial pathogens that pose a significant threat to global public health because of the lack of available therapeutic options. Phage therapy shows promise as a potential alternative to current antimicrobial chemotherapies. In this study, we isolated a new Siphoviridae phage vB_KpnS_SXFY507 against KPC-producing K. pneumoniae from hospital sewage. It had a short latent period of 20 min and a large burst size of 246 phages/cell. The host range of phage vB_KpnS_SXFY507 was relatively broad. It has a wide range of pH tolerance and high thermal stability. The genome of phage vB_KpnS_SXFY507 was 53,122 bp in length with a G + C content of 49.1%. A total of 81 open-reading frames (ORFs) and no virulence or antibiotic resistance related genes were involved in the phage vB_KpnS_SXFY507 genome. Phage vB_KpnS_SXFY507 showed significant antibacterial activity in vitro. The survival rate of Galleria mellonella larvae inoculated with K. pneumoniae SXFY507 was 20%. The survival rate of K. pneumonia-infected G. mellonella larvae was increased from 20 to 60% within 72 h upon treatment with phage vB_KpnS_SXFY507. In conclusion, these findings indicate that phage vB_KpnS_SXFY507 has the potential to be used as an antimicrobial agent for the control of K. pneumoniae.</p
Table_2_Characterization and genome analysis of phage vB_KpnS_SXFY507 against Klebsiella pneumoniae and efficacy assessment in Galleria mellonella larvae.DOCX
Carbapenem-resistant Klebsiella pneumoniae is one of the primary bacterial pathogens that pose a significant threat to global public health because of the lack of available therapeutic options. Phage therapy shows promise as a potential alternative to current antimicrobial chemotherapies. In this study, we isolated a new Siphoviridae phage vB_KpnS_SXFY507 against KPC-producing K. pneumoniae from hospital sewage. It had a short latent period of 20 min and a large burst size of 246 phages/cell. The host range of phage vB_KpnS_SXFY507 was relatively broad. It has a wide range of pH tolerance and high thermal stability. The genome of phage vB_KpnS_SXFY507 was 53,122 bp in length with a G + C content of 49.1%. A total of 81 open-reading frames (ORFs) and no virulence or antibiotic resistance related genes were involved in the phage vB_KpnS_SXFY507 genome. Phage vB_KpnS_SXFY507 showed significant antibacterial activity in vitro. The survival rate of Galleria mellonella larvae inoculated with K. pneumoniae SXFY507 was 20%. The survival rate of K. pneumonia-infected G. mellonella larvae was increased from 20 to 60% within 72 h upon treatment with phage vB_KpnS_SXFY507. In conclusion, these findings indicate that phage vB_KpnS_SXFY507 has the potential to be used as an antimicrobial agent for the control of K. pneumoniae.</p
Additional file 1: of Genetic characterization of novel class 1 Integrons In0, In1069 and In1287 to In1290, and the inference of In1069-associated integron evolution in Enterobacteriaceae
Sequence analysis for In0, In1069, In893, and In1287 to In1290, respetively. (ZIP 65 kb
Microfluidic Device-Based <i>In Vivo</i> Detection of PD-L1-Positive Small Extracellular Vesicles and Its Application for Tumor Monitoring
Liquid biopsy is of great significance in tumor early
diagnosis
and treatment stratification. PD-L1-positive small extracellular vesicles
(PD-L1+ sEVs) are closely related to tumor growth and immunotherapy
response, which are considered valuable liquid biopsy biomarkers.
In contrast to conventional in vitro detection, in vivo detection has the ability to improve the detection
efficiency and enable continuous or real-time dynamic monitoring.
However, in vivo detection of PD-L1+ sEVs
has multiple difficulties, such as high cell background, complex blood
environments, and lack of a specific and stable detection method.
Herein, the in vivo detection of PD-L1+ sEVs method was constructed, which efficiently separated sEVs based
on the microfluidic device and quantitatively analyzed PD-L1+ sEVs by aptamer recognition and hybridization chain reaction. The
concentration of PD-L1+ sEVs was continuously monitored,
and significant differences at different stages of tumor as well as
a correlation with tumor volume were found. Diseased and healthy individuals
could also be effectively distinguished based on the concentration
of PD-L1+ sEVs. The method with good stability, biocompatibility,
and detection performance provided a powerful means for in
vivo detection of PD-L1+ sEVs, contributing to
the clinical diagnosis and treatment of tumor
Additional file 2: of Genetic characterization of novel class 1 Integrons In0, In1069 and In1287 to In1290, and the inference of In1069-associated integron evolution in Enterobacteriaceae
Integron analysis for In0 and In1069. (XLS 33 kb
Novel β‑Carboline/Hydroxamic Acid Hybrids Targeting Both Histone Deacetylase and DNA Display High Anticancer Activity via Regulation of the p53 Signaling Pathway
A novel
series of hybrids from β-carboline and hydroxamic
acid were designed and synthesized. Several compounds (<b>5m</b>, <b>11b</b>–<b>d</b>, and <b>11h</b>) not
only exerted significant antiproliferation activity against four human
colorectal cancer (CRC) cell lines but also showed histone deacetylase
inhibitory effects in vitro. The most potent compound, <b>11c</b>, exhibited anticancer potency sevenfold higher than that of SAHA. <b>11c</b> triggered more significant cancer cell apoptosis than
did SAHA by cleavage of both PARP and caspase 3 in a dose-dependent
manner. Furthermore, <b>11c</b> simultaneously increased the
acetylation of histone H3 and α-tubulin, enhanced expression
of DNA damage markers histone H2AX phosphorylation and p-p53 (Ser15),
and activated p53 signaling pathway in HCT116 cells. Finally, <b>11c</b> showed low acute toxicity in mice and inhibited the growth
of implanted human CRC in mice more potently than did SAHA. Together, <b>11c</b> possessed potent antitumor activity and may be a promising
candidate for the potential treatment of human CRC
Image_2.TIF
<p>Forty-five KPC-producing Enterobacteriaceae strains were isolated from multiple departments in a Chinese public hospital from 2014 to 2015. Genome sequencing of four representative strains, namely Proteus mirabilis GN2, Serratia marcescens GN26, Morganella morganii GN28, and Klebsiella aerogenes E20, indicated the presence of bla<sub>KPC-2</sub>-carrying IncX6 plasmids pGN2-KPC, pGN26-KPC, pGN28-KPC, and pE20-KPC in the four strains, respectively. These plasmids were genetically closely related to one another and to the only previously sequenced IncX6 plasmid, pKPC3_SZ. Each of the plasmids carried a single accessory module containing the bla<sub>KPC-2/3</sub>-carrying ΔTn6296 derivatives. The ΔTn6292 element from pGN26-KPC also contained qnrS, which was absent from all other plasmids. Overall, pKPC3_SZ-like bla<sub>KPC</sub>-carrying IncX6 plasmids were detected by PCR in 44.4% of the KPC-producing isolates, which included K. aerogenes, P. mirabilis, S. marcescens, M. morganii, Escherichia coli, and Klebsiella pneumoniae, and were obtained from six different departments of the hospital. Data presented herein provided insights into the genomic diversity and evolution of IncX6 plasmids, as well as the dissemination and epidemiology of bla<sub>KPC</sub>-carrying IncX6 plasmids among Enterobacteriaceae in a hospital setting.</p