Max Planck Institutes and Experts

So far Denisovans were only known from a small collection of fossil fragments from Denisova Cave in Siberia. Together with researchers from China Jean-Jacques Hublin from the Max Planck Institute for Evolutionary Anthropology describes a 160,000-year-old hominin mandible from Xiahe in China. Using ancient protein analysis the researchers found that the mandible’s owner belonged to a population that occupied the Tibetan Plateau in the Middle Pleistocene and that was closely related to the Denisovans from Siberia.

Cells contact other cells via precise docking points. Cell migration and immune reactions require a finely tuned attachment and detachment process. Therefore, the contact sites consist of a whole machinery of proteins, in which talin plays a central role. Using cryo-electron microscopy, we were able to show how talin can assume an inactive spherical shape and is thus inaccessible to contact other proteins. These results help to understand the adhesion mechanism and also dysfunctions in disease processes.

Climate extremes, in particular heat waves, droughts, and their combination are inevitably increasing as a result of climate change. But little is known about how these events affect the terrestrial biosphere, which ecosystem functions are severely affected, and what feedbacks this may trigger in the climate system. At the Max Planck Institute for Biogeochemistry we are developing new methods for the detection of extreme events in heterogeneous data streams. Our results show, among other things, how differently various ecosystems can react to extreme events.

Controlled protein degradation plays a crucial role for the correct progression of cell cycle, signal transduction, gene expression or programmed cell death. In eukaryotes, organisms with a nucleus, a complex machinery of enzymes handles this highly regulated process. Recently, the existence of related enzyme systems has also been found in prokaryotes, organisms without a nucleus. The analysis of these nanomachines provides insight into the evolution of cellular protein degradation and the origin of the eukaryotic degradation machinery.

The overexpression of four specific transcription factors allows for reprogramming of somatic cells into induced pluripotent stem cells (iPSCs), which can give rise to all cell types of the adult body. We found that overexpression of one of these factors,  Oct4, causes epigenetic changes that deteriorate the quality of the resultant iPSCs. Excluding Oct4 from the reprogramming cocktail leads to iPSCs with unprecedented developmental potential.