... is a molecular biologist with a particular interest in spatial aspects of mRNA metabolism and posttranscriptional regulation of gene expression. Susanne received her degree in biochemistry at the Free University in Berlin in 2000, where she also started her PhD project in the laboratory of Professor Michael Boshart. She received her doctoral degree in 2005 at the LMU in Munich, followed by six years of postdoctoral studies at the Department of Biochemistry in Cambridge (UK) in the lab of Professor Mark Carrington. Susanne joined the Biocenter in November 2011. She is leading an independent, DFG funded Research group (Kramer lab) and has done her Habilitation in 2016. Recently, she was awarded a Heisenberg Position.
2018 Group leader, Heisenberg funding (DFG), Cell and Developmental Biology, University of Würzburg
2016 Habilitation, University of Würzburg
2011 Junior group leader, Cell and Developmental Biology, University of Würzburg
2005-2011 Postdoc, Cambridge (UK)
2005 Postdoc, LMU Munich
2005 Dr. rer. nat, LMU Munich
Tel ++49 93131 86785
Susanne has used the African trypanosome as a model system for 18 years and worked on two different aspects: During her PhD time she has characterized the trypanosome homologue to a protein kinase A that has highly unusual features in trypanosomes. During her Postdoc time in Cambridge, Susanne became interested in understanding post-transcriptional control mechanisms of gene expression: trypanosomes have almost no transcriptional control and are perfect model organisms for this research area. In particular, Susanne became very interested in RNA-granules, small membrane-less organelles that are separated from the cytoplasm by liquid liquid phase separation, with still largely unknown function. In Cambridge, Susanne has characterised the RNA granule repertoire of trypanosomes as well as several key granule proteins. Later she realised that RNA granule research was seriously hampered by the lack of a method for granule purification. With her own group at the Biocenter in Würzburg, Susanne has therefore successfully developed methods for RNA granule purification. With the granule’s protein and RNA content in hand Susanne is currently analysing granule function and regulation using a combination of biochemical, cell biological and molecular biological methods. Two unexpected outcomes from the purification of trypanosome RNA granules were 1) the discovery of the highly unusual trypanosome mRNA deapping enzyme, which belongs to the novel enzyme class of ApaH like phosphatases and 2) the discovery that mRNA export can occur co-transcriptionally in trypanosomes. Both findings are subject to on-going research.
More details about Susanne Kramer's research can be found here.
Londono, P. A. C., Banholzer, N., Bannerman, B. P. & Kramer, S. (2021) Is mRNA decapping activity of ApaH like phosphatases (ALPH’s) the reason for the loss of cytoplasmic ALPH’s in all eukaryotes but Kinetoplastida? doi:10.21203/rs.3.rs-192222/v1. PMID: 34162332
Kramer, S., Meyer-Natus, E., Stigloher, C., Thoma, H., Schnaufer, A. and Engstler M. (2020) Parallel monitoring of RNA abundance, localisation and compactness with correlative single molecule FISH on LR White embedded samples. Nucleic Acids Res 49, gkaa1142- PMID: 33275141
Goos C, Dejung M, Wehman AM, Meyer-Natus E, Schmidt J, SunterJ , Engstler M, Butter F and Kramer S. (2019) Trypanosomes can initiate nuclear export co-transcriptionally. Nucleic Acid research 47, 266-282. PMID:30418648
Kramer S and McLennan AG. (2018) The complex enzymology of mRNA decapping: enzymes of four classes cleave pyrophosphate bounds.WIREs RNA 38, e1511–17. PMID:30345629
Kramer S (2017) The ApaH-like phosphatase TbALPH1 is the major mRNA decapping enzyme of trypanosomes. PLoS Pathog 13: e1006456 PMID: 28628654
Kramer S (2017) Simultaneous detection of mRNA transcription and decay intermediates by dual colour single mRNA FISH on subcellular resolution. Nucleic Acids Res 45: e49 PMID:27940558
Fritz M, Vanselow J, Sauer N, Lamer S, Goos C, Siegel TN, Subota I, Schlosser A, Carrington M & Kramer S (2015) Novel insights into RNP granules by employing the trypanosome's microtubule skeleton as a molecular sieve. Nucleic Acids Res 43: 8013–8032 PMID:26187993
Krüger T, Hofweber M & Kramer S (2013) SCD6 induces ribonucleoprotein granule formation in trypanosomes in a translation-independent manner, regulated by its Lsm and RGG domains. Mol Biol Cell 24: 2098–2111 PMID:23676662
Kramer S, Marnef A, Standart N & Carrington M (2012) Inhibition of mRNA maturation in trypanosomes causes the formation of novel foci at the nuclear periphery containing cytoplasmic regulators of mRNA fate. J Cell Sci 125: 2896–2909 PMID:22366449
Kramer S, Queiroz R, Ellis L, Hoheisel JD, Clayton CE & Carrington M (2010b) The RNA helicase DHH1 is central to the correct expression of many developmentally regulated mRNAs in trypanosomes. J Cell Sci 123: 699–711 PMID:20124414
Kramer S, Queiroz R, Ellis L, Webb H, Hoheisel JD, Clayton CE & Carrington M (2008) Heat shock causes a decrease in polysomes and the appearance of stress granules in trypanosomes independently of eIF2(alpha) phosphorylation at Thr169. J Cell Sci 121: 3002–3014 PMID:18713834