{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"institution":[{"name":"bioRxiv"}],"indexed":{"date-parts":[[2026,6,27]],"date-time":"2026-06-27T00:23:32Z","timestamp":1782519812687,"version":"3.54.5"},"posted":{"date-parts":[[2023,5,20]]},"group-title":"Microbiology","reference-count":35,"publisher":"openRxiv","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"accepted":{"date-parts":[[2023,8,28]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                <jats:p>\n                  <jats:italic>Clostridioides difficile<\/jats:italic>\n                  (CD) is a sporulating and toxin-producing nosocomial pathogen that opportunistically infects the gut, particularly in patients with depleted microbiota after antibiotic exposure. Metabolically, CD rapidly generates energy and substrates for growth from Stickland fermentations of amino acids, with proline being a preferred reductive substrate. To investigate the\n                  <jats:italic>in vivo<\/jats:italic>\n                  effects of reductive proline metabolism on\n                  <jats:italic>C<\/jats:italic>\n                  .\n                  <jats:italic>difficile\u2019s<\/jats:italic>\n                  virulence in an enriched gut nutrient environment, we evaluated wild-type and isogenic\n                  <jats:italic>\u0394prdB<\/jats:italic>\n                  strains of ATCC43255 on pathogen behaviors and host outcomes in highly susceptible gnotobiotic mice. Mice infected with the\n                  <jats:italic>\u0394prdB<\/jats:italic>\n                  mutant demonstrated extended survival via delayed colonization, growth and toxin production but ultimately succumbed to disease.\n                  <jats:italic>In vivo<\/jats:italic>\n                  transcriptomic analyses demonstrated how the absence of proline reductase activity more broadly disrupted the pathogen\u2019s metabolism including failure to recruit oxidative Stickland pathways, ornithine transformations to alanine, and additional pathways generating growth-promoting substrates, contributing to delayed growth, sporulation, and toxin production. Our findings illustrate the central role for proline reductase metabolism to support early stages of\n                  <jats:italic>C. difficile<\/jats:italic>\n                  colonization and subsequent impact on the pathogen\u2019s ability to rapidly expand and cause disease.\n                <\/jats:p>","DOI":"10.1101\/2023.05.19.541423","type":"posted-content","created":{"date-parts":[[2023,5,21]],"date-time":"2023-05-21T01:30:16Z","timestamp":1684632616000},"source":"Crossref","is-referenced-by-count":6,"title":["Central\n                  <i>in vivo<\/i>\n                  mechanisms by which\n                  <i>C. difficile\u2019s<\/i>\n                  proline reductase drives efficient metabolism, growth, and toxin production"],"prefix":"10.64898","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9605-1205","authenticated-orcid":false,"given":"Laura M.","family":"Cersosimo","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1231-0578","authenticated-orcid":false,"given":"Madeline","family":"Graham","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Auriane","family":"Monestier","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7516-6633","authenticated-orcid":false,"given":"Aidan","family":"Pavao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5923-1159","authenticated-orcid":false,"given":"Jay N.","family":"Worley","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3207-9465","authenticated-orcid":false,"given":"Johann","family":"Peltier","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7176-8453","authenticated-orcid":false,"given":"Bruno","family":"Dupuy","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8792-8527","authenticated-orcid":false,"given":"Lynn","family":"Bry","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"54368","reference":[{"key":"2023083121251079000_2023.05.19.541423v2.1","doi-asserted-by":"publisher","DOI":"10.1177\/17562848211018654"},{"key":"2023083121251079000_2023.05.19.541423v2.2","doi-asserted-by":"publisher","DOI":"10.1093\/cid\/ciz169"},{"key":"2023083121251079000_2023.05.19.541423v2.3","doi-asserted-by":"publisher","DOI":"10.1371\/journal.ppat.1009181"},{"key":"2023083121251079000_2023.05.19.541423v2.4","doi-asserted-by":"publisher","DOI":"10.2147\/IDR.S207572"},{"key":"2023083121251079000_2023.05.19.541423v2.5","doi-asserted-by":"publisher","DOI":"10.1186\/s12879-016-1786-6"},{"key":"2023083121251079000_2023.05.19.541423v2.6","doi-asserted-by":"publisher","DOI":"10.1007\/s10620-019-05900-3"},{"key":"2023083121251079000_2023.05.19.541423v2.7","doi-asserted-by":"publisher","DOI":"10.1111\/nyas.13958"},{"key":"2023083121251079000_2023.05.19.541423v2.8","doi-asserted-by":"publisher","DOI":"10.1099\/13500872-141-2-371"},{"key":"2023083121251079000_2023.05.19.541423v2.9","doi-asserted-by":"publisher","DOI":"10.1016\/j.chom.2021.09.007"},{"key":"2023083121251079000_2023.05.19.541423v2.10","doi-asserted-by":"publisher","DOI":"10.1016\/j.chom.2021.09.008"},{"key":"2023083121251079000_2023.05.19.541423v2.11","doi-asserted-by":"publisher","DOI":"10.1016\/j.anaerobe.2022.102600"},{"key":"2023083121251079000_2023.05.19.541423v2.12","doi-asserted-by":"publisher","DOI":"10.1128\/msphere.00926-21"},{"key":"2023083121251079000_2023.05.19.541423v2.13","doi-asserted-by":"publisher","DOI":"10.7554\/eLife.51420"},{"key":"2023083121251079000_2023.05.19.541423v2.14","doi-asserted-by":"publisher","DOI":"10.1080\/19490976.2018.1435244"},{"key":"2023083121251079000_2023.05.19.541423v2.15","doi-asserted-by":"publisher","DOI":"10.1128\/JB.01492-12"},{"key":"2023083121251079000_2023.05.19.541423v2.16","doi-asserted-by":"publisher","DOI":"10.1038\/s42255-021-00506-4"},{"key":"2023083121251079000_2023.05.19.541423v2.17","doi-asserted-by":"publisher","DOI":"10.1139\/cjm-2013-0903"},{"key":"2023083121251079000_2023.05.19.541423v2.18","doi-asserted-by":"publisher","DOI":"10.1128\/jb.00229-22"},{"key":"2023083121251079000_2023.05.19.541423v2.19","doi-asserted-by":"publisher","DOI":"10.1128\/JB.01370-06"},{"key":"2023083121251079000_2023.05.19.541423v2.20","doi-asserted-by":"publisher","DOI":"10.1128\/JB.01370-06"},{"key":"2023083121251079000_2023.05.19.541423v2.21","doi-asserted-by":"publisher","DOI":"10.1126\/scitranslmed.aam7019"},{"key":"2023083121251079000_2023.05.19.541423v2.22","doi-asserted-by":"publisher","DOI":"10.1016\/j.anaerobe.2020.102210"},{"key":"2023083121251079000_2023.05.19.541423v2.23","doi-asserted-by":"publisher","DOI":"10.1111\/1462-2920.14048"},{"key":"2023083121251079000_2023.05.19.541423v2.24","doi-asserted-by":"publisher","DOI":"10.1371\/journal.ppat.1011034"},{"key":"2023083121251079000_2023.05.19.541423v2.25","doi-asserted-by":"crossref","unstructured":"Pavao L , Girinathan B , Peltier J , Altamirano Silva P , Dupuy B , Muti I , et al. Elucidating dynamic anaerobe metabolism with HRMAS 13C NMR and genome-scale modeling. Nature Chemical Biology. 2023: In Press.","DOI":"10.1101\/2022.06.13.495811"},{"key":"2023083121251079000_2023.05.19.541423v2.26","doi-asserted-by":"publisher","DOI":"10.1016\/j.chom.2021.09.007"},{"key":"2023083121251079000_2023.05.19.541423v2.27","doi-asserted-by":"publisher","DOI":"10.1128\/JB.01777-08"},{"key":"2023083121251079000_2023.05.19.541423v2.28","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-277X.2010.01139.x"},{"key":"2023083121251079000_2023.05.19.541423v2.29","doi-asserted-by":"publisher","DOI":"10.3177\/jnsv.55.242"},{"key":"2023083121251079000_2023.05.19.541423v2.30","doi-asserted-by":"publisher","DOI":"10.1038\/s41586-021-03502-6"},{"key":"2023083121251079000_2023.05.19.541423v2.31","doi-asserted-by":"publisher","DOI":"10.1128\/JB.00584-19"},{"issue":"1","key":"2023083121251079000_2023.05.19.541423v2.32","doi-asserted-by":"crossref","first-page":"718","DOI":"10.1038\/s42003-020-01448-5","article-title":"Type I toxin-antitoxin systems contribute to the maintenance of mobile genetic elements in Clostridioides difficile","volume":"3","year":"2020","journal-title":"Communications biology"},{"issue":"4","key":"2023083121251079000_2023.05.19.541423v2.33","first-page":"399","article-title":"Body composition of mice of different body condition score and sex","volume":"44","year":"1996","journal-title":"Acta Vet Hung"},{"key":"2023083121251079000_2023.05.19.541423v2.34","doi-asserted-by":"publisher","DOI":"10.4049\/jimmunol.172.1.433"},{"key":"2023083121251079000_2023.05.19.541423v2.35","doi-asserted-by":"publisher","DOI":"10.1016\/j.micpath.2017.03.002"}],"container-title":[],"original-title":[],"link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1101\/2023.05.19.541423","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,1,15]],"date-time":"2026-01-15T04:40:49Z","timestamp":1768452049000},"score":1,"resource":{"primary":{"URL":"http:\/\/biorxiv.org\/lookup\/doi\/10.1101\/2023.05.19.541423"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,5,20]]},"references-count":35,"URL":"https:\/\/doi.org\/10.1101\/2023.05.19.541423","relation":{},"subject":[],"published":{"date-parts":[[2023,5,20]]},"subtype":"preprint"}}