MIRO-1 Determines Mitochondrial Shape Transition upon GPCR Activation and Ca2+ Stress

Neeharika Nemani, Edmund Carvalho, Dhanendra Tomar, Zhiwei Dong, Andrea Ketschek, Sarah L. Breves, Fabián Jaña, Alison M. Worth, Julie Heffler, Palaniappan Palaniappan, Aparna Tripathi, Ramasamy Subbiah, Massimo F. Riitano, Ajay Seelam, Thomas Manfred, Kie Itoh, Shuxia Meng, Hiromi Sesaki, William J. Craigen, Sudarsan RajanSanthanam Shanmughapriya, Jeffrey Caplan, Benjamin L. Prosser, Donald L. Gill, Peter B. Stathopulos, Gianluca Gallo, David C. Chan, Prashant Mishra, Muniswamy Madesh

Research output: Contribution to journalArticlepeer-review

74 Scopus citations


Mitochondria shape cytosolic calcium ([Ca2+]c) transients and utilize the mitochondrial Ca2+ ([Ca2+]m) in exchange for bioenergetics output. Conversely, dysregulated [Ca2+]c causes [Ca2+]m overload and induces permeability transition pore and cell death. Ablation of MCU-mediated Ca2+ uptake exhibited elevated [Ca2+]c and failed to prevent stress-induced cell death. The mechanisms for these effects remain elusive. Here, we report that mitochondria undergo a cytosolic Ca2+-induced shape change that is distinct from mitochondrial fission and swelling. [Ca2+]c elevation, but not MCU-mediated Ca2+ uptake, appears to be essential for the process we term mitochondrial shape transition (MiST). MiST is mediated by the mitochondrial protein Miro1 through its EF-hand domain 1 in multiple cell types. Moreover, Ca2+-dependent disruption of Miro1/KIF5B/tubulin complex is determined by Miro1 EF1 domain. Functionally, Miro1-dependent MiST is essential for autophagy/mitophagy that is attenuated in Miro1 EF1 mutants. Thus, Miro1 is a cytosolic Ca2+ sensor that decodes metazoan Ca2+ signals as MiST. Metazoan Ca2+ signal determines mitochondrial shape transition (MiST) and cellular quality control. Nemani et al. find that mitochondria undergo shape changes upon Ca2+ stress. MiST is distinct from matrix Ca2+-induced swelling and mitochondrial dynamics. The conserved Ca2+ sensor Miro1 enables MiST and promotes autophagy/mitophagy.

Original languageEnglish (US)
Pages (from-to)1005-1019
Number of pages15
JournalCell Reports
Issue number4
StatePublished - Apr 24 2018
Externally publishedYes


  • EF hand
  • MCU
  • MiST
  • Miro
  • PTP
  • autophagy
  • calcium
  • mitochondrial dynamics
  • mitochondrial shape
  • mitophagy

ASJC Scopus subject areas

  • General Biochemistry, Genetics and Molecular Biology


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