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Name
Andrey Y.
Surname
Abramov
Scientific organization
Institute eof Neurology, University College London
Academic degree
Professor, Doctor of Science
Position
Professor
Scientific discipline
Life Sciences & Medicine
Topic
no
Abstract
no
Keywords
alpha-synuclein, energy metabolism, mitochondria, brain
Summary

Essential role of alpha-synuclein in brain energy metabolism – implication to health and neurodegeneration

Alexey V. Berezhnov1,Marthe H.R. Ludtmann2, Andrey Y. Abramov2

1Institute of Cell Biophysics Russian Academy of Sciences, Pushchino, Russia

2UCL Institute of Neurology, London, UK

Despite a strong implication of misfolded α-synuclein in Parkinson’s disease, very little is known about the role of this protein in physiology. However, knowledge about a physiological role for unfolded, monomeric α-synuclein is limited.  We have found an important function for alppha-synuclein in the regulation of ATP synthase activity.  Applicatioon of extracellular monomeric α-synuclein enters the cell and localises to mitochondria, interacts with ATP synthase and modulates ATP synthase function. Using a combination of biochemical, live cell imaging and mitochondrial respiration analysis we found that lack of synuclein in mitochondria  are uncoupled as characterised by increased mitochondrial respiration and reduced mitochondrial membrane potential. Furthermore, synuclein deficiency results in reduced ATP synthase efficiency and lower ATP levels. Exogenous application of monomeric α-synuclein is able to increase the ATP synthase activity that rescue the mitochondrial phenotypes observed in synuclein-deficiency. Overall, the data suggest that alpha-synuclein is a previously unrecognised physiological regulator of mitochondrial bioenergetics in brain cells through its ability to interact with ATP synthase and increase its efficiency.