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- W2030626872 abstract "Erwinia chrysanthemi are phytopathogenic enterobacteria causing soft-rot disease due to pectolytic enzymes degrading plant cell walls. We constructed a genomic library from Sau3A-digested E. chrysanthemi B374 DNA cloned in the BamHI site of the broad-host-range cosmid pMMB33 grown in Escherichia coli. Out of 1500 kanamycin-resistant (KmR) transductants of E. coli, nine pectolytic-enzyme-positive clones were identified. One of these contained the pEW325 cosmid with a 35-kb insert of Erwinia DNA. Cell extracts of E. coli harboring the cosmid pEW325 were fractionated on a polyacrylamide electrofocusing gel; bands with pectolytic activity were found to co-focus with pectolytic enzymes of E. chrysanthemi B374 strain. Cosmid pEW325 encodes three pectolytic enzymes PL10, PL20 and PL130 with isoelectric points of about 9.3,9.2 and 4.6, respectively. These enzymes are lyases that cleave polygalacturonate by transelimination, and give rise to unsaturated products. A 15-kb HindIII fragment coding for polygalacturonate lyases was subcloned in pBR322, and a physical map of the resulting plasmid pPL01 was constructed. Starting from the pPL01, various endonuclease-generated fragments were subcloned into pBR322. Genes encoding pectate lyases were localized within an 8-kb fragment (pPL04) and then in a 2.7-kb fragment (pPL03). Polygalacturonate lyases are expressed at various levels; they accumulated in the periplasmic space of E. coli host, whereas E. chrysanthemi secreted these enzymes into the culture medium." @default.
- W2030626872 created "2016-06-24" @default.
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- W2030626872 date "1985-01-01" @default.
- W2030626872 modified "2023-10-16" @default.
- W2030626872 title "Cloning of genes encoding pectolytic enzymes from a genomic library of the phytopathogenic bacterium, Erwinia chrysanthemi" @default.
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- W2030626872 doi "https://doi.org/10.1016/0378-1119(85)90164-7" @default.
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