FLUORESCENCE-BASED REPORTERS FOR MUTAGENESIS DETECTION IN E. COLI

    公开(公告)号:US20220251624A1

    公开(公告)日:2022-08-11

    申请号:US17728812

    申请日:2022-04-25

    IPC分类号: C12Q1/34 C12N9/86 C12N15/72

    摘要: Direct detection of mutagenesis in prokaryotes by reversion of an inactivating mutation (reversion mutation assay), producing a quantitative signal for in vivo mutagenesis, may greatly reduce the amount of test chemicals and labor involved in these assays. Further, transcriptional coupling of β-lactamase reversion and GFP, translational fusion between β-lactamase and GFP with stop codon in GFP, and a novel dual reporter to monitor continuous mutagenesis may be used in methods described herein.

    Direct detection of the active form of beta-lactam-hydrolysing enzymes by using mass spectrophotometry

    公开(公告)号:US11327079B2

    公开(公告)日:2022-05-10

    申请号:US16627710

    申请日:2018-12-12

    摘要: The present invention relates to a method of directly detecting, using a mass-spectrometry method, whether a microorganism contained in a sample is resistant to antibiotics, and a kit for detection used therewith. More particularly, the present invention relates to a method and kit for directly detecting an antibiotic hydrolase secreted by a microorganism resistant to antibiotics, thereby directly determining whether the microorganism is resistant to antibiotics. According to the present invention, it is possible to very simply and immediately confirm whether a specific strain is resistant to antibiotics in the field. In particular, a complicated pretreatment process such as proteolysis is not performed, and a complicated identification process of calibrating and then combining the obtained results is not performed. Accordingly, it is possible to realize a method of easily confirming whether antibiotic resistance occurs in just a dozen minutes, compared to a conventional technology in which it takes several days to confirm whether antibiotic resistance occurs, and a simple diagnostic kit used therewith.

    Beta-lactamase variants
    10.
    发明授权

    公开(公告)号:US10982205B2

    公开(公告)日:2021-04-20

    申请号:US16078040

    申请日:2017-02-22

    申请人: DA VOLTERRA BIOASTER

    摘要: The present invention relates to an isolated polypeptide having beta-lactamase activity and nucleic acid sequences encoding the polypeptide. The isolated polypeptide of the invention is a Verona integron-encoded metallo-β-lactamase (VIM-2) variant with improved properties such as improved protease stability, stability in intestinal medium, improved activity against one or more antibiotics, improved specific activity and/or improved production in a host cell.