Proteobacterial Origin of Protein Arginine Methylation and Regulation of Complex I Assembly by MidA

Umar F. Shahul Hameed, Oana Sanislav, Sui T. Lay, Sarah J. Annesley, Chacko Jobichen, Paul R. Fisher, Kunchithapadam Swaminathan, Stefan T. Arold

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The human protein arginine methyltransferase NDUFAF7 controls the assembly of the ∼1-MDa mitochondrial complex I (CI; the NADH ubiquinone oxidoreductase) by methylating its subunit NDUFS2. We determined crystal structures of MidA, the Dictyostelium ortholog of NDUFAF7. The MidA catalytic core domain resembles other eukaryotic methyltransferases. However, three large core loops assemble into a regulatory domain that is likely to control ligand selection. Binding of MidA to NDUFS2 is weakened by methylation, suggesting a mechanism for methylation-controlled substrate release. Structural and bioinformatic analyses support that MidA and NDUFAF7 and their role in CI assembly are conserved from bacteria to humans, implying that protein methylation already existed in proteobacteria. In vivo studies confirmed the critical role of the MidA methyltransferase activity for CI assembly, growth, and phototaxis of Dictyostelium. Collectively, our data elucidate the origin of protein arginine methylation and its use by MidA/NDUFAF7 to regulate CI assembly.
Original languageEnglish (US)
Pages (from-to)1996-2004
Number of pages9
JournalCell Reports
Issue number8
StatePublished - Aug 24 2018

Bibliographical note

KAUST Repository Item: Exported on 2021-02-19
Acknowledgements: We acknowledge SOLEIL for the provision of synchrotron radiation facilities, and we would like to thank L. Chavas, P. Legrand, S. Sirigu, and P. Montaville for assistance in using beamline PROXIMA 1; G. Fox, M. Savko, and B. Shepard for assistance in using beamline PROXIMA 2A; and J. Perez and A. Thureau for assistance in using the beamline SWING. We also acknowledge the National Synchrotron Radiation Research Centre beamline 13B1 of the Taiwan Synchrotron Facility for X-ray data collection. We thank the KAUST Bioscience Core Labs for their support. This research was supported by the King Abdullah University of Science and Technology (KAUST) and the Academic Research Fund (FRC) of the Ministry of Education, Singapore (to K.S.).


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