Abstract - Mitochondria and chloroplast import most of their protein complement post-translationally from the cytosol. Sorting specifictity is implemented by amino-terminal targeting information of the preproteins, cytosolic factors as well as specific receptors at the organellar surface. Distinct translocation machineries facilitate transport across the two organellar membranes. Details will be presented on the cytosolic factors involved in targeting, their docking proteins at the surface of mitochondria and chloroplasts, as well as the two independent import complexes in chloroplasts. Upon import proteins are further sorted to distinct organellar subcompartments. Plant mitochondria are unique in that they contain a functional TAT pathway to translocate folded proteins, which is not present in mitochondria from fungi or animals.
Biography - Professor Doctor Jürgen Soll obtained his PhD in Plant Biology in 1981 from the Botanical Institute at the University of Veterinary Medicine in Hannover, Germany. Following a postdoctoral fellowship with Prof. Bob Buchanan at the University of California Berkeley, he returned to Germany as a Staff Scientist at Ludwig-Maximilians Universität (LMU) Munich where he obtained his Habilitation in Botany in 1986. He was then appointed to Professorship positions first at the Universität des Saarlandes followed by the Christian-Albrechts-Universität zu Kiel, where he was also Department Head of Botany and Director of the Botanical Institute respectively. Since 2001 Prof. Soll has been Professor and Chair of Biochemistry and Physiology of Plants at LMU Munich, where his research group studies the metabolism and biochemistry of green plant cells, with particular focus on transport and signaling processes which integrate chloroplasts into eukaryotic cells. Prof. Soll's contribution to understanding chloroplast function has been recognized by two of the highest scientific honours in Germany, being elected to the German Academy of Sciences, Leopoldina; and awarded the Gottfried Wilhelm Leibniz Prize by the German Research Foundation.