{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,23]],"date-time":"2026-08-23T17:36:43Z","timestamp":1787506603738,"version":"build-2736575974"},"reference-count":66,"publisher":"Oxford University Press (OUP)","license":[{"start":{"date-parts":[[2025,8,5]],"date-time":"2025-08-05T00:00:00Z","timestamp":1754352000000},"content-version":"vor","delay-in-days":217,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"funder":[{"DOI":"10.13039\/100014456","name":"Center for Bioenergy Innovation","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100014456","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100000015","name":"U.S. Department of Energy","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100000015","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Office of Science, Biological and Environmental Research Program","award":["ERKP886"],"award-info":[{"award-number":["ERKP886"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2024,12,31]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>Clostridium thermocellum is an anaerobic thermophile capable of producing ethanol and other commodity chemicals from lignocellulosic biomass. The insertion of heterologous DNA into the C. thermocellum chromosome is currently achieved via a time-consuming homologous recombination process, where a single stable insertion can take 2\u20134 weeks or more to construct. In this work, we developed a thermostable version of the Serine recombinase Assisted Genome Engineering (tSAGE) approach for gene insertion in C. thermocellum utilizing a site-specific recombinase from Geobacillus sp. Y412MC61, enabling quick and easy insertion of DNA into the chromosome for accelerated genetic tool screening and heterologous gene expression. Using tSAGE, chromosomal insertion of plasmid DNA occurred at a maximum transformation efficiency of 5\u00a0\u00d7\u00a0103 CFU\/\u00b5g, which is comparable to the transformation efficiency of a replicating control plasmid in C. thermocellum. Using tSAGE, we chromosomally integrated and characterized 17 reporter genes, 15 homologous and 31 heterologous constitutive promoters of varying strengths, 4 inducible promoters, and 5 riboswitches in C. thermocellum. We also determined that a 6\u20137 nucleotide gap between the ribosome binding site (RBS) and the start codon is optimal for high expression by employing a library of superfolder green fluorescent protein expression constructs driven by our strongest tested promoter (Pclo1313_1194) with different distances between the RBS and start codon. The tools developed here will aid in accelerating C. thermocellum strain engineering for producing sustainable fuels and chemicals directly from plant biomass.<\/jats:p>\n                  <jats:p>One-Sentence Summary: A highly efficient site-specific recombination system was created for Clostridium thermocellum, which enabled the rapid characterization of a large collection of genetic parts for controlled gene expression.<\/jats:p>","DOI":"10.1093\/jimb\/kuaf023","type":"journal-article","created":{"date-parts":[[2025,8,5]],"date-time":"2025-08-05T11:34:58Z","timestamp":1754393698000},"source":"Crossref","is-referenced-by-count":5,"title":["Thermophilic site-specific recombination system for rapid insertion of heterologous DNA into the\n                    <i>Clostridium thermocellum<\/i>\n                    chromosome"],"prefix":"10.1093","volume":"52","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9506-2375","authenticated-orcid":false,"given":"Nandhini","family":"Ashok","sequence":"first","affiliation":[{"name":"Biosciences Division, Oak Ridge National Laboratory , Oak Ridge, TN 37831 ,","place":["USA"]},{"name":"Center for Bioenergy Innovation, Oak Ridge National Laboratory , Oak Ridge, TN 37831 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yasemin","family":"Kaygusuz","sequence":"additional","affiliation":[{"name":"Biosciences Division, Oak Ridge National Laboratory , Oak Ridge, TN 37831 ,","place":["USA"]},{"name":"Center for Bioenergy Innovation, Oak Ridge National Laboratory , Oak Ridge, TN 37831 ,","place":["USA"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6019-4869","authenticated-orcid":false,"given":"Heidi 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