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- W2037969439 abstract "Abstract We have recently shown that two flexible loops of Streptomyces phospholipase D (PLD) affect the catalytic reaction of the enzyme by a comparative study of chimeric PLDs. Gly188 and Asp191 of PLD from Streptomyces septatus TH‐2 (TH‐2PLD) were identified as the key amino acid residues involved in the recognition of phospholipids. In the present study, we further investigated the relationship between a C‐terminal loop of TH‐2PLD and PLD activities to elucidate the reaction mechanism and the recognition of the substrate. By analyzing chimeras and mutants in terms of hydrolytic and transphosphatidylation activities, Ala426 and Lys438 of TH‐2PLD were identified as the residues associated with the activities. We found that Gly188 and Asp191 recognized substrate forms, whereas residues Ala426 and Lys438 enhanced transphosphatidylation and hydrolysis activities regardless of the substrate form. By substituting Ala426 and Lys438 with Phe and His, respectively, the mutant showed not only higher activities but also higher thermostability and tolerance against organic solvents. Furthermore, the mutant also improved the selectivity of the transphosphatidylation activity. The residues Ala426 and Lys438 were located in the C‐terminal flexible loop of Streptomyces PLD separate from the highly conserved catalytic HxKxxxxD motifs. We demonstrated that this C‐terminal loop, which formed the entrance of the active well, has multiple functional roles in Streptomyces PLD." @default.
- W2037969439 created "2016-06-24" @default.
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- W2037969439 date "2007-02-01" @default.
- W2037969439 modified "2023-09-30" @default.
- W2037969439 title "C-terminal loop of Streptomyces phospholipase D has multiple functional roles" @default.
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- W2037969439 doi "https://doi.org/10.1110/ps.062537907" @default.
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