Falcon deep research report: functional annotation of pvdD (Q88F79 / PP_4219) in Pseudomonas putida KT2440
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PvdD is verified as the pyoverdine nonribosomal peptide synthetase encoded by PP_4219 in P. putida KT2440, with a pvdD mutant unable to produce pyoverdine.
"pvdD is explicitly identified as PP_4219 encoding a pyoverdine nonribosomal peptide synthetase"
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A pvdD mutant does not produce pyoverdine, consistent with PvdD being essential for siderophore biosynthesis under iron limitation.
"consistent with PvdD being an essential biosynthetic enzyme for siderophore formation under iron limitation"
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Pyoverdine precursor assembly is carried out by large modular NRPSs using a thiotemplate mechanism of adenylation, carrier, and condensation domains.
"NRPSs are large modular enzymes that assemble peptides via a thiotemplate mechanism"
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The peptidyl carrier protein domain covalently tethers the activated monomer on a phosphopantetheine arm during NRPS assembly.
"covalently tethers the activated monomer on a phosphopantetheine arm"
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P. aeruginosa PvdD has the terminal thioesterase; the target Q88F79 also carries a terminal thioesterase domain, supporting analogous product release without imposing the same module substrates.
"PvdD is the only NRPS ending in a thioesterase domain"
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PvdD assembly occurs in the cytoplasm, before precursor export across the inner membrane and periplasmic maturation.
"pyoverdine synthesis begins in the cytoplasm"
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P. aeruginosa single-molecule imaging places PvdI/PvdJ/PvdD in the cytoplasm; this is comparative localization evidence for the KT2440 target.
"PvdI/PvdJ/PvdD explore the cytoplasm"
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Comparative P. aeruginosa pyoverdine schemes assign these residues to PvdJ/PvdD; they are not a validated substrate map for KT2440 Q88F79.
"PvdJ and PvdD catalyze addition of L-Lys, L-hfOrn, and two L-Thr residues"
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In KT2440, a pvdD mutant leaves more iron in supernatants than wild type, indicating reduced pyoverdine-mediated iron acquisition.
"pvdD mutant left more iron in supernatants than wild type"
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pvdD transcription is condition-responsive, increasing roughly 3-5 fold in arginine-biosynthesis mutants of KT2440.
"pvdD and pvdA expression increased ~3"