کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2041421 1073160 2014 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A Bacterial Homolog of a Eukaryotic Inositol Phosphate Signaling Enzyme Mediates Cross-kingdom Dialog in the Mammalian Gut
ترجمه فارسی عنوان
یک همبستگی باکتریال یک آنزیم سیگنالینگ آنتی اکسیدان فوکوات یوکاریوتی، متشکل از گفتگوی صلیبی پادشاهی در گلو پستانداران
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم کشاورزی و بیولوژیک (عمومی)
چکیده انگلیسی


• Bacteroides thetaiotaomicron (Bt) secretes a cell-signaling InsP6 phosphatase MINPP
• BtMinpp is exceptionally active and rationalized from its crystal structure
• BtMinpp is secreted in outermembrane vesicles
• BtMinpp/OMVs promote Ca2+ signaling in intestinal epithelial cells

SummaryDietary InsP6 can modulate eukaryotic cell proliferation and has complex nutritive consequences, but its metabolism in the mammalian gastrointestinal tract is poorly understood. Therefore, we performed phylogenetic analyses of the gastrointestinal microbiome in order to search for candidate InsP6 phosphatases. We determined that prominent gut bacteria express homologs of the mammalian InsP6 phosphatase (MINPP) and characterized the enzyme from Bacteroides thetaiotaomicron (BtMinpp). We show that BtMinpp has exceptionally high catalytic activity, which we rationalize on the basis of mutagenesis studies and by determining its crystal structure at 1.9 Å resolution. We demonstrate that BtMinpp is packaged inside outer membrane vesicles (OMVs) protecting the enzyme from degradation by gastrointestinal proteases. Moreover, we uncover an example of cross-kingdom cell-to-cell signaling, showing that the BtMinpp-OMVs interact with intestinal epithelial cells to promote intracellular Ca2+ signaling. Our characterization of BtMinpp offers several directions for understanding how the microbiome serves human gastrointestinal physiology.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: - Volume 6, Issue 4, 27 February 2014, Pages 646–656
نویسندگان
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