Medizinische Fakultät der Universität des Saarlandes
Sie befinden sich hier: >> Startseite >> Klinische Zentren und Einrichtungen >> Fachrichtungen Theoretische und Klinische Medizin >> Biophysik >> Dr. B. Niemeyer >> Projekte

Key research :


  • Regulation of ORAI and STIM by posttranslational mechanisms
  • Regulation of immune cell Ca2+ channel function under pathological conditions such as oxidative stress, multiple sclerosis and neurodegeneration
  • Role of the cellular redox state in the regulation of ion channel function
  • Counting ion channel subunits


Calcium ions are universal second messengers, involved in signalling pathways ranging  from exocytosis, sensory signalling, transcription factor activation, proliferation amongst others. Changes in the intracellular Ca2+ concentration thus must be finely tuned both in time and space to ensure specificity of signalling cascades.


We are interested in the regulation of calcium selective ion channels on a molecular and cell physiological level. Immune cells are tightly regulated by changes in the intracellular Ca2+ concentration. Their major influx pathway is through ORAI proteins in the plasma membrane which are directly activated by interaction with the ER Ca2+-sensor, STIM1, upon ER Ca2+ depletion. We want to investigate how ORAI and STIM proteins are regulated on a molecular level, by their environment and by other intracellular signalling cascades in primary T cells from healthy donors and understand how and if Ca2+ signalling is affected in primary cells from patients with immune disorders.


Our methods include molecular biology, biochemistry, Ca2+ imaging analysis, electrophysiology (patch-clamp) and high resolution microscopy (live cell imaging, TIRF and tohether with Prof. de Jonge, INM, electron microscopy).


The group includes postdocs, PhD students, Masters - and Bachelor students.

Please inquire for potential open positions.



see also