ジャーナル: Nat Struct Mol Biol / 年: 2025 タイトル: Filament formation and NAD processing by noncanonical human FAM118 sirtuins. 著者: Domagoj Baretić / Sophia Missoury / Karishma Patel / Maximilien Martinez / Franck Coste / Kang Zhu / Rebecca Smith / Anna Georgina Kopasz / Yang Lu / Nicolas Bigot / Catherine Chapuis / ...著者: Domagoj Baretić / Sophia Missoury / Karishma Patel / Maximilien Martinez / Franck Coste / Kang Zhu / Rebecca Smith / Anna Georgina Kopasz / Yang Lu / Nicolas Bigot / Catherine Chapuis / Romane Riou / Nina Đukić / Stéphane Goffinont / Valentin Pressoir / Sara Patačko / Gyula Timinszky / Marc Delarue / Bertrand Castaing / Dragana Ahel / Andreja Mikoč / Sébastien Huet / Ivan Ahel / Marcin J Suskiewicz / 要旨: Sirtuins are an ancient family of enzymes with diverse nicotinamide adenine dinucleotide (NAD)-dependent activities. Here we identify family with sequence similarity 118 member B (FAM118B) and ...Sirtuins are an ancient family of enzymes with diverse nicotinamide adenine dinucleotide (NAD)-dependent activities. Here we identify family with sequence similarity 118 member B (FAM118B) and FAM118A-two understudied vertebrate proteins-as vertebrate-specific sirtuins with similarities to bacterial antiphage sirtuins. We show that human FAM118B forms head-to-tail filaments both in vitro and in living human cells, a feature that appears to be conserved in both FAM118B and its paralog FAM118A across vertebrates. While human FAM118B and FAM118A have individually very weak NAD-processing activity in vitro, their interaction leads to markedly increased activity, suggesting a tightly regulated system. The overexpression of wild-type human FAM118B and FAM118A leads to strongly decreased NAD levels in human cells, an effect that is abolished in catalytically dead or filament-deficient mutants. Our study highlights filament formation and NAD processing as conserved mechanisms among immunity-associated sirtuins across evolution.
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