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Journal Article

mtDNA makes a U-turn for the mitochondrial nucleoid


Kukat,  C.
Max Planck Society;

Larsson,  N. G.
Max Planck Society;

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Kukat, C., & Larsson, N. G. (2013). mtDNA makes a U-turn for the mitochondrial nucleoid. Trends Cell Biol, 23(9), 457-63. doi:10.1016/j.tcb.2013.04.009.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0028-592F-C
Mitochondria contain mtDNA derived from the ancestral endosymbiont genome. Important subunits of the oxidative phosphorylation system, which supplies cells with the energy currency ATP, are encoded by mtDNA. A naked mtDNA molecule is longer than a typical mitochondrion and is therefore compacted in vivo to form a nucleoprotein complex, denoted the mitochondrial nucleoid. Mitochondrial transcription factor A (TFAM) is the main factor packaging mtDNA into nucleoids and is also essential for mtDNA transcription initiation. The crystal structure of TFAM shows that it bends mtDNA in a sharp U-turn, which likely provides the structural basis for its dual functions. Super-resolution imaging studies have revealed that the nucleoid has an average diameter of approximately 100nm and frequently contains a single copy of mtDNA. In this review the structure of the mitochondrial nucleoid and its possible regulatory roles in mtDNA expression will be discussed.