PEOPLE
PEOPLE
Dr. Marius Ortjohann
Postdoctoral researcher
Research topics & projects
Haloferax volcanii, Biochemistry of halophilic proteins, Membrane Biochemistry, Chromosome-segregation
Education & positions
since 2025 Postdoctoral researcher, Institute of General Microbiology, Christian-Albrechts-University Kiel
2021 - 2025 Postdoctoral researcher, Zoological Institute, Christian-Albrechts-University Kiel
2016 - 2021 PhD student, Institute of General Microbiology, Christian-Albrechts-University Kiel
2013 - 2015 Master of Science, Institute of General Microbiology, Christian-Albrechts-University Kiel
2011 - 2013 Bachelor of Science, Institute of General Microbiology, Christian-Albrechts-University Kiel
Publications
Premrajka K, Johnsen U, Preidel H, Wienberg J, Corleis C, Ortjohann M, Giacomelli G, Bramkamp M. Equipositioning of chromosomes in the polyploid archaeon Haloferax volcanii by HpaAB. Nat Commun. 2026 Oct 30;17(1):11296.
https://doi.org/10.1038/s41467-026-78993-w
Ortjohann M, Leippe M. Molecular characterization of two newly recognized lysozymes of the protist Dictyostelium discoideum. Dev Comp Immunol. 2025 Mar;164:105334.
https://doi.org/10.1016/j.dci.2025.105334
Ortjohann M, Schönheit P. Sugar alcohol degradation in Archaea: uptake and degradation of mannitol and sorbitol in Haloarcula hispanica. Extremophiles. 2024 Oct 28;28(3):48.
https://doi.org/10.1007/s00792-024-01365-z
Ortjohann M, Leippe M. Molecular Characterization of Ancient Prosaposin-like Proteins from the Protist Dictyostelium discoideum. Biochemistry. 2024 Nov 5;63(21):2768-2777.
https://doi.org/10.1021/acs.biochem.4c00479
Ortjohann M, Leippe M. Characterization of NK-lysin A, a potent antimicrobial peptide from the zebrafish Danio rerio. Dev Comp Immunol. 2025 Jan;162:105266.
https://doi.org/10.1016/j.dci.2024.105266
Ortjohann M, Schönheit P. Identification and characterization of a novel type of ketohexokinase from the haloarchaeon Haloferax volcanii. FEMS Microbiol Lett. 2024 Jan 9;371:fnae026.
https://doi.org/10.1093/femsle/fnae026
Johnsen U, Ortjohann M, Reinhardt A, Turner JM, Stratton C, Weber KR, Sanchez KM, Maupin-Furlow J, Davies C, Schönheit P. Discovery of a novel transcriptional regulator of sugar catabolism in archaea. Mol Microbiol. 2023 Aug;120(2):224-240.
https://doi.org/10.1111/mmi.15114
Kuprat T*, Ortjohann M*, Johnsen U, Schönheit P. Glucose Metabolism and Acetate Switch in Archaea: the Enzymes in Haloferax volcanii. J Bacteriol. 2021 Mar 23;203(8):e00690-20.
https://doi.org/10.1128/jb.00690-20
Kuprat T, Johnsen U, Ortjohann M, Schönheit P. Acetate Metabolism in Archaea: Characterization of an Acetate Transporter and of Enzymes Involved in Acetate Activation and Gluconeogenesis in Haloferax volcanii. Front Microbiol. 2020 Dec 4;11:604926.
https://doi.org/10.3389/fmicb.2020.604926
Tästensen JB, Johnsen U, Reinhardt A, Ortjohann M, Schönheit P. D-galactose catabolism in archaea: operation of the DeLey-Doudoroff pathway in Haloferax volcanii. FEMS Microbiol Lett. 2020 Jan 1;367(1):fnaa029. doi: 10.1093/femsle/fnaa029. Erratum in: FEMS Microbiol Lett. 2020 Jun 1;367(11):fnaa069.
https://doi.org/10.1093/femsle/fnaa029
Johnsen U, Ortjohann M, Sutter JM, Geweke S, Schönheit P. Uptake of D-xylose and L-arabinose in Haloferax volcanii involves an ABC transporter of the CUT1 subfamily. FEMS Microbiol Lett. 2019 Apr 1;366(8):fnz089.
https://doi.org/10.1093/femsle/fnz089
Zaitsev V, Johnsen U, Reher M, Ortjohann M, Taylor GL, Danson MJ, Schönheit P, Crennell SJ. Insights into the Substrate Specificity of Archaeal Entner-Doudoroff Aldolases: The Structures of Picrophilus torridus 2-Keto-3-deoxygluconate Aldolase and Sulfolobus solfataricus 2-Keto-3-deoxy-6-phosphogluconate Aldolase in Complex with 2-Keto-3-deoxy-6-phosphogluconate. Biochemistry. 2018 Jul 3;57(26):3797-3806.
https://doi.org/10.1021/acs.biochem.8b00535
* shared first authorship
