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• W2783160147 abstract "Peptidase family S46 consists of two types of dipeptidyl-peptidases (DPPs), DPP7 and DPP11, which liberate dipeptides from the N-termini of polypeptides along with the penultimate hydrophobic and acidic residues, respectively. Their specificities are primarily defined by a single amino acid residue, Gly673 in DPP7 and Arg673 in DPP11 (numbering for Porphyromonas gingivalis DPP11). Bacterial species in the phyla Proteobacteria and Bacteroidetes generally possess one gene for each, while Bacteroides species exceptionally possess three genes, one gene as DPP7 and two genes as DPP11, annotated based on the full-length similarities. In the present study, we aimed to characterize the above-mentioned Bacteroides S46 DPPs. A recombinant protein of the putative DPP11 gene BF9343_2924 from Bacteroides fragilis harboring Gly673 exhibited DPP7 activity by hydrolyzing Leu-Leu-4-methylcoumaryl-7-amide (MCA). Another gene, BF9343_2925, as well as the Bacteroides vulgatus gene (BVU_2252) with Arg673 was confirmed to encode DPP11. These results demonstrated that classification of S46 peptidase is enforceable by the S1 essential residues. Bacteroides DPP11 showed a decreased level of activity towards the substrates, especially with P1-position Glu. Findings of 3D structural modeling indicated three potential amino acid substitutions responsible for the reduction, one of which, Asn650Thr substitution, actually recovered the hydrolyzing activity of Leu-Glu-MCA. On the other hand, the gene currently annotated as DPP7 carrying Gly673 from B. fragilis (BF9343_0130) and Bacteroides ovatus (Bovatus_03382) did not hydrolyze any of the examined substrates. The existence of a phylogenic branch of these putative Bacteroides DPP7 genes classified by the C-terminal conserved region (Ser571-Leu700) strongly suggests that Bacteroides species expresses a DPP with an unknown property. In conclusion, the genus Bacteroides exceptionally expresses three S46-family members; authentic DPP7, a new subtype of DPP11 with substantially reduced specificity for Glu, and a third group of S46 family members." @default.
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• W2783160147 date "2018-04-01" @default.
• W2783160147 modified "2023-10-16" @default.
• W2783160147 title "Identification of a new subtype of dipeptidyl peptidase 11 and a third group of the S46-family members specifically present in the genus Bacteroides" @default.
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• W2783160147 doi "https://doi.org/10.1016/j.biochi.2017.10.015" @default.
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