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- W2020838464 abstract "A bacterial challenge of larvae of the dipteran insect Phormia terranovae induces the rapid synthesis of diptericin, an antibacterial polypeptide, previously characterized at the amino acid level and indirectly by cDNA cloning studies. This 82-residue polypeptide consists of an N-terminal proline-rich domain and a central and C-terminal glycine-rich domain. Using liquid chromatography coupled to electrospray ionization-mass spectrometry, we demonstrate here that this molecule is more complex than anticipated and carries two O-substitutions on threonine residues, one in the proline-rich domain (residue 10) and one in the glycine-rich domain (residue 54). These substitutions consist of identical trisaccharides: glucose-->galactose-->N-acetylgalactosamine-->(threonine). Treatment of diptericin with O-glycosidase, which selectively removes the substitutions without altering the polypeptide proper, abolishes the antibacterial activity, indicating that this posttranslational modification is essential for biological activity of the polypeptide. We also show that diptericin is posttranslationally modified by a C-terminal amidation." @default.
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- W2020838464 date "1995-06-06" @default.
- W2020838464 modified "2023-09-25" @default.
- W2020838464 title "Insect immunity. The inducible antibacterial peptide diptericin carries two O-glycans necessary for biological activity" @default.
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- W2020838464 doi "https://doi.org/10.1021/bi00022a012" @default.
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