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Albrecht von Arnim

Contact Info

FacultyvonArnim2Albrecht von Arnim
Professor

Office: Hesler, Room 228: (865- 974-6206)

Lab: Hesler, Room 230: (865-974-6221)

Email: vonarnim@utk.edu

Ph.D. University of East Anglia (UK)

Research Statement

The past ten years have witnessed a renaissance in our appreciation for the   role of RNA in gene regulation. Protein synthesis (translation) in particular   remains poorly understood, although translational control affords a rapid means   to amplify changes in gene activity that occur at the level of transcription.

We are using the reference plant Arabidopsis thaliana because of the   excellent genetic resources available in this species. A reporter gene system   was developed to monitor the translation status of specific genes in response to   external signals, such as the light environment. We are combining this tool with   mutations affecting individual translation initiation factors in an effort to   assign specific functions to these proteins in translational control. Our data   exemplify that generic initiation factors can contribute to the   sequence-specific regulation of translational efficiency. Specifically, we   implicated the H subunit of the largest initiation factor, eIF3, in the control   of translation by upstream open reading frames, a type of regulatory device   present in the 5’ leader of many mRNAs. Furthermore, we have learned how to use   the toolkit of genomics, such as microarrays and bioinformatics, to survey the   translation status of the entire set of cellular mRNAs. Experiments such as   these are poised to reveal systematically which mRNAs are bundled together into   regulons of translational control.

This work is helping us to understand how plants respond to their   environment, has implications for the mechanisms of translational control in   eukaryotes in general, and it may lead to novel ways to manipulate gene   expression in the context of biotechnology.

Independently, we are engaged in developing biosensor technology for   monitoring specific cellular events, in particular protein-protein interactions.   To this end, we are harnessing a biophysical phenomenon, termed bioluminescence   resonance energy transfer (BRET), which allows one to measure directly whether   and when two proteins associate with each other in a living organism in real   time. These and other related biosensors can yield direct and immediate insights   into the mechanisms of life in plants and animals.

Selected Publications

Missra, A., Ernest, B., Lohoff, T., Jia, Q., Satterlee, J., Ke, K., and von Arnim, A.G. 2015. The circadian clock modulates global daily cycles of mRNA ribosome loading. Plant Cell 27: 2582-2599.

Zhou, F., Roy, B., Dunlap, J.R., Enganti, R., and von Arnim, A.G. 2014. Translational control of Arabidopsis meristem stability and organogenesis by the eukaryotic translation factor eIF3h. PLoS One 9:e95396.

von Arnim, A.G., Jia, Q., Vaughn, J.N. (2014). Review: Regulation of plant translation by upstream open reading frames. Plant Science 214:1-12.

Missra, A and von Arnim, A.G. (2014). Analysis of mRNA translation states over the diurnal cycle by polysome microarray. In: Plant Circadian Networks (Dorothee Staiger, Ed.). Methods in Molecular Biology1158:157-174.

 Tiruneh, B.S., Kim, B.H., Gallie, D.R., Roy, B., and von Arnim, A.G. (2013). The global translation profile in a ribosomal protein mutant resembles that of an eIF3 mutant. BMC Biology 11:123.

 Roy, B., and von Arnim, A.G. (2013). Translational regulation of cytoplasmic mRNAs. In: The Arabidopsis Book. K Torii and C Chang eds. e0165.

 Kim, B.H., Malec, P., Waloszek, A., von Arnim, A.G. (2012). Arabidopsis BPG2: A phytochrome regulated gene whose protein product binds to plastid ribosomal RNAs. Planta 236: 677-690.

Vaughn, J.N., Ellingson, S.R., Mignone, F., and von Arnim, A.G. (2012). Known and Novel Post-Transcriptional Regulatory Sequences are Conserved across Plant Families. RNA 18: 368-384. Plant J. 58:208-19.

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