Professor Christian Siebold

(A) Repulsive Guidance Molecule (RGM) in complex with its receptor NEO1 (Science 2013). (B) RGM-NEO1-BMP complex, revealing that RGM bridges the NEO1 and BMP morphogen pathways (NSMB 2015).
Crystal structures of the GPCR and Hh signal transducer Smoothened bound to the agonist cholesterol and the anti-cancer drug vismodegib, respectively (Nature 2016, ELife 2016).

Structural studies on Morphogen Signalling

A handful of secreted morphogen signalling molecules, acting in a spatial and gradient-dependent manner, orchestrate the development of multicellular organism. Morphogen dysfunction leads to a range of diseases and defects in adult stem cell populations. Their importance in human disease has become increasingly clear over the past decade: dysfunctions of the pathways are known to lead to severe developmental and neurological diseases, and cancer.

Our group seeks to generate mechanistic insights relevant to disease and embryonic development focusing on two fundamental morphogen signalling systems: the Hedgehog (Hh) and the bone morphogenetic protein (BMP) pathways. Extracellular Hh and BMP signals are mediated by various cell surface receptor molecules. We aim to unravel the molecular mechanisms underlying Hh and BMP morphogen gradient formation and signal transduction across the cell membrane.

To achieve this, we are using structural biology techniques such as X-ray crystallography and cryo electron microscopy to obtain molecular snapshots of Hh and BMP interactions with other proteins. We combine atomic details from in vitro structural and biophysical studies on single molecules with analyses of Hh and BMP function in living cells. Our findings will be integrated with those from developmental and cellular biologists to provide a deeper understanding of these pathways and explore translational opportunities, for example in anti-cancer therapy.

Professor Christian Siebold Professor Christian Siebold


  • Professor of Structural Biology
  • Cancer Research UK Senior Research Fellow
  • Grant Holding Senior Scientist

Group Information

  • Morphogens and Cell Surface Receptor Signalling

Current Group

  • Tomas Malinauskas Tomas
  • Rachel Woolley Rachel
  • Christiane Kowatsch Christiane
  • Claire Coupland Claire
  • Maria Kokolaki Maria
  • Amalie Rudolf Amalie
  • Benjamin Bishop Benjamin
  • Oliver Hayward Oliver
  • Rebekka Siebold-Schwab Rebekka