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- W2364754495 abstract "Pyrroloquinoline quinone (PQQ) is a cofactor of some oxido-reductases with many important physiological effects and potential pharmaceutical applications. The glucose dehydrogenase of Escherichia coli, being a candidate for enzymic detection of PQQ, is known to be a quinoprotein which is obligately dependant on PQQ as cofactor. The gdh gene of E. coli was amplified and cloned into plasmid pET28a. The recombinant GDH was overexpressed in soluble form in E. coli BL21 (DE3). A bioassay method was established for determination of PQQ by the purified GDH. A screening model was set up for the enrichment of methylotrophic bacteria. Together with the above bioassay method, over 2000 soil samples were screened for the isolation of high-yielding PQQ producing strains. A methylotrophic strain, named MP606, was thus isolated. The PQQ production of MP606 is determined to be 113mg/L without conditional optimization and genetic breeding. The PQQ crystal was obtained from the culture supernatant which has been identified by HPLC, absorption spectra assay, and enzymatic analysis. The 16S rDNA of MP606 was amplified and sequenced. According to the comparison of 16S rDNA sequences, overall similarity value between strain MP606 and 12 typical methylotrophic bacteria is above 95% . The highest value is with two strains of Methylovorus, which reached at 99%." @default.
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- W2364754495 date "2007-12-01" @default.
- W2364754495 modified "2023-09-23" @default.
- W2364754495 title "[Establishment of the screening method and isolation of PQQ producing strains]." @default.
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