@article{bielen_verhaart_vanfossen_blumer-schuette_stams_oost_kelly_kengen_2013, title={A thermophile under pressure: Transcriptional analysis of the response of Caldicellulosiruptor saccharolyticus to different H-2 partial pressures}, volume={38}, ISSN={["1879-3487"]}, DOI={10.1016/j.ijhydene.2012.11.082}, abstractNote={Increased hydrogen (H2) levels are known to inhibit H2 formation in Caldicellulosiruptor saccharolyticus. To investigate this organism's strategy for dealing with elevated H2 levels the effect of the hydrogen partial pressure (PH2) on fermentation performance was studied by growing cultures under high and low PH2 in a glucose limited chemostat setup. Transcriptome analysis revealed the upregulation of genes involved in the disposal of reducing equivalents under high PH2, like lactate dehydrogenase and alcohol dehydrogenase as well as the NADH-dependent and ferredoxin-dependent hydrogenases. These findings are in line with the observed shift in fermentation profiles from acetate production to the production of acetate, lactate and ethanol under high PH2. Moreover, differential transcription was observed for genes involved in carbon metabolism, fatty acid biosynthesis and several transport systems. In addition, presented transcription data provide evidence for the involvement of the redox sensing Rex protein in gene regulation under high PH2 cultivation conditions.}, number={4}, journal={INTERNATIONAL JOURNAL OF HYDROGEN ENERGY}, author={Bielen, Abraham A. M. and Verhaart, Marcel R. A. and VanFossen, Amy L. and Blumer-Schuette, Sara E. and Stams, Alfons J. M. and Oost, John and Kelly, Robert M. and Kengen, Serve W. M.}, year={2013}, month={Feb}, pages={1837–1849} } @article{vanfossen_ozdemir_zelin_kelly_2011, title={Glycoside Hydrolase Inventory Drives Plant Polysaccharide Deconstruction by the Extremely Thermophilic Bacterium Caldicellulosiruptor saccharolyticus}, volume={108}, ISSN={["1097-0290"]}, DOI={10.1002/bit.23093}, abstractNote={Abstract}, number={7}, journal={BIOTECHNOLOGY AND BIOENGINEERING}, author={VanFossen, Amy L. and Ozdemir, Inci and Zelin, Samantha L. and Kelly, Robert M.}, year={2011}, month={Jul}, pages={1559–1569} } @article{vanfossen_verhaart_kengen_kelly_2009, title={Carbohydrate Utilization Patterns for the Extremely Thermophilic Bacterium Caldicellulosiruptor saccharolyticus Reveal Broad Growth Substrate Preferences}, volume={75}, ISSN={["1098-5336"]}, DOI={10.1128/AEM.01959-09}, abstractNote={ABSTRACT}, number={24}, journal={APPLIED AND ENVIRONMENTAL MICROBIOLOGY}, author={VanFossen, Amy L. and Verhaart, Marcel R. A. and Kengen, Serve M. W. and Kelly, Robert M.}, year={2009}, month={Dec}, pages={7718–7724} } @article{comfort_chou_conners_vanfossen_kelly_2008, title={Functional-genomics-based identification and characterization of open reading frames encoding alpha-glucoside-processing enzymes in the hyperthermophilic archaeon Pyrococcus furiosus}, volume={74}, ISSN={["1098-5336"]}, DOI={10.1128/AEM.01920-07}, abstractNote={ABSTRACT}, number={4}, journal={APPLIED AND ENVIRONMENTAL MICROBIOLOGY}, author={Comfort, Donald A. and Chou, Chung-Jung and Conners, Shannon B. and VanFossen, Amy L. and Kelly, Robert M.}, year={2008}, month={Feb}, pages={1281–1283} } @article{werken_verhaart_vanfossen_willquist_lewis_nichols_goorissen_mongodin_nelson_niel_et al._2008, title={Hydrogenomics of the Extremely Thermophilic Bacterium Caldicellulosiruptor saccharolyticus}, volume={74}, ISSN={["0099-2240"]}, DOI={10.1128/AEM.00968-08}, abstractNote={ABSTRACT}, number={21}, journal={APPLIED AND ENVIRONMENTAL MICROBIOLOGY}, author={Werken, Harmen J. G. and Verhaart, Marcel R. A. and VanFossen, Amy L. and Willquist, Karin and Lewis, Derrick L. and Nichols, Jason D. and Goorissen, Heleen P. and Mongodin, Emmanuel F. and Nelson, Karen E. and Niel, Ed W. J. and et al.}, year={2008}, month={Nov}, pages={6720–6729} } @article{vanfossen_lewis_nichols_kelly_2008, title={Polysaccharide Degradation and Synthesis by Extremely Thermophilic Anaerobes}, volume={1125}, ISBN={["978-1-57331-705-4"]}, ISSN={["0077-8923"]}, DOI={10.1196/annals.1419.017}, abstractNote={Extremely thermophilic fermentative anaerobes (growth Topt ≥ 70°C) have the capacity to use a variety of carbohydrates as carbon and energy sources. As such, a wide variety of glycoside hydrolases and transferases have been identified in these microorganisms. The genomes of three model extreme thermophiles—an archaeon Pyrococcus furiosus (Topt = 98°C), and two bacteria, Thermotoga maritima (Topt = 80°C) and Caldicellulosiruptor saccharolyticus (Topt = 70°C)—encode numerous carbohydrate‐active enzymes, many of which have been characterized biochemically in their native or recombinant forms. In addition to their voracious appetite for polysaccharide degradation, polysaccharide production has also been noted for extremely thermophilic fermentative anaerobes; T. maritima generates exopolysaccharides that aid in biofilm formation, a process that appears to be driven by intraspecies and interspecies interactions.}, number={1}, journal={Annals of the New York Academy of Sciences}, author={VanFossen, A.L. and Lewis, D.L. and Nichols, J.D. and Kelly, R.M.}, year={2008}, month={Mar}, pages={322–337} }