Falcon deep research report for pqqC (Q88QV6, P. putida KT2440)
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PqqC is the enzyme catalyzing the final step of PQQ biosynthesis, converting the late intermediate AHQQ into PQQ.
"**PqqC** is widely described as the enzyme catalyzing the **final step** of PQQ biosynthesis"
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The terminal PqqC reaction proceeds by ring closure coupled to a multi-electron oxidation using molecular oxygen, and is cofactor-independent.
"via **ring closure** coupled to a **multi-electron oxidation** using molecular oxygen"
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The AHQQ-to-PQQ conversion consumes 3 equivalents of O2 and produces 2 H2O2 and 2 H2O, consistent with the UniProt and GO reaction stoichiometry.
"**3 equivalents of O\_2 consumed**, producing **2 equivalents H\_2O\_2** and **2 equivalents H\_2O** during conversion of AHQQ to PQQ"
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PqqC is a cofactorless oxidase capable of substantial redox chemistry without a metal or organic cofactor.
"PqqC as a **cofactorless oxidase**"
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PqqC adopts a homodimeric architecture with a large conformational change upon PQQ binding that closes the active site.
"a large **conformational change** upon PQQ binding that"
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In P. putida KT2440, pqqC is a core member of the conserved PQQ-biosynthesis gene cluster pqqF-A-B-C-D-E-G.
"**pqqC** is a core member of the conserved PQQ-biosynthesis gene cluster that includes **pqqF-A-B-C-D-E-G"
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RT-PCR evidence shows pqqC-pqqD-pqqE-pqqG are cotranscribed on a single transcript, placing pqqC in a coordinated terminal module of the pathway.
"RT-PCR evidence that **pqqC–pqqD–pqqE–pqqG** are **cotranscribed on one transcript**"
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PQQ formation is considered cytosolic, with subsequent utilization by periplasmic dehydrogenases such as PQQ-dependent glucose dehydrogenase.
"PQQ formation is considered **cytosolic**, with subsequent utilization by **periplasmic dehydrogenases**"
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KT2440-specific PqqC biochemistry is inferred by homology and mechanistic conservation; the catalytic step and active-site residues are strongly conserved across the PqqC family.
"inference by homology/mechanistic conservation"