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• W2107800922 abstract "The general aminopeptidase PepN from Streptococcus thermophilus A was purified to protein homogeneity by hydroxyapatite, anion-exchange, and gel filtration chromatographies. The PepN enzyme was estimated to be a monomer of 95 kDa, with maximal activity on N-Lys-7-amino-4-methylcoumarin at pH 7 and 37 degrees C. It was strongly inhibited by metal chelating agents, suggesting that it is a metallopeptidase. The activity was greatly restored by the bivalent cations Co2+, Zn2+, and Mn2+. Except for proline, glycine, and acidic amino acid residues, PepN has a broad specificity on the N-terminal amino acid of small peptides, but no significant endopeptidase activity has been detected. The N-terminal and short internal amino acid sequences of purified PepN were determined. By using synthetic primers and a battery of PCR techniques, the pepN gene was amplified, subcloned, and further sequenced, revealing an open reading frame of 2,541 nucleotides encoding a protein of 847 amino acids with a molecular weight of 96,252. Amino acid sequence analysis of the pepN gene translation product shows high homology with other PepN enzymes from lactic acid bacteria and exhibits the signature sequence of the zinc metallopeptidase family. The pepN gene was cloned in a T7 promoter-based expression plasmid and the 452-fold overproduced PepN enzyme was purified to homogeneity from the periplasmic extract of the host Escherichia coli strain. The overproduced enzyme showed the same catalytic characteristics as the wild-type enzyme." @default.
• W2107800922 created "2016-06-24" @default.
• W2107800922 creator A5046585902 @default.
• W2107800922 creator A5046997176 @default.
• W2107800922 creator A5085267541 @default.
• W2107800922 date "1999-07-01" @default.
• W2107800922 modified "2023-10-18" @default.
• W2107800922 title "Purification, Characterization, Gene Cloning, Sequencing, and Overexpression of Aminopeptidase N from <i>Streptococcus thermophilus</i> A" @default.
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• W2107800922 doi "https://doi.org/10.1128/aem.65.7.3001-3007.1999" @default.
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