Afg3p, a mitochondrial atp-dependent metalloprotease, is involved in degradation of mitochondrially-encoded cox1, cox3, cob, su6, su8 and su9 subunits of the inner membrane complex-III, complex-IV and complex-V

AbstractThe yeast AFG3 gene encodes an ATP-dependent metalloprotease belonging to a subgroup of the AAA-family. This protease has been suggested to be essential for a metal- and ATP-dependent breakdown of incompletely mitochondrially synthesized polypeptides in the inner membrane, a process proposed to be important for mitochondrial function (Pajic et al. (1994) FEBS Lett. 353, 201–206). Here, we confirm the proteolytic activity by site-directed mutagenesis and demonstrate that the proteins Cox1, Cox3, Cob, Su6, Su8 and Su9 are substrates of Afg3p. Surprisingly, this proteolytic activity is not required for respiratory function and thus presumably also not essential for mitochondrial biogenesis

Biological Threats Are National Security Risks: Why COVID-19 Should Be a Wake up Call for Policy Makers

A national security strategy is the “nation’s plan for the coordinated use of all the instruments of state power—nonmilitary as well as military—to pursue objectives that defend and advance its national interest.” Perhaps the most straightforward national security objective is to protect the country from foreign invasion, but national security involves other objectives that aim to protect people in the United States as well as their values. For example, protecting U.S. elections from foreign interference is a security objective that advances the nation’s interest in democratic governance. The outbreak of a highly contagious disease like COVID‑19 strikes at the core of national security and the nation’s interest in protecting its citizens from unnecessary harm

Non-canonical Helitrons in <em>Fusarium oxysporum</em>

BACKGROUND: Helitrons are eukaryotic rolling circle transposable elements that can have a large impact on host genomes due to their copy-number and their ability to capture and copy genes and regulatory elements. They occur widely in plants and animals, and have thus far been relatively little investigated in fungi. RESULTS: Here, we comprehensively survey Helitrons in several completely sequenced genomes representing the F. oxysporum species complex (FOSC). We thoroughly characterize 5 different Helitron subgroups and determine their impact on genome evolution and assembly in this species complex. FOSC Helitrons resemble members of the Helitron2 variant that includes Helentrons and DINEs. The fact that some Helitrons appeared to be still active in FOSC provided the opportunity to determine whether Helitrons occur as a circular intermediate in FOSC. We present experimental evidence suggesting that at least one Helitron subgroup occurs with joined ends, suggesting a circular intermediate. We extend our analyses to other Pezizomycotina and find that most fungal Helitrons we identified group phylogenetically with Helitron2 and probably have similar characteristics. CONCLUSIONS: FOSC genomes harbour non-canonical Helitrons that are characterized by asymmetric terminal inverted repeats, show hallmarks of recent activity and likely transpose via a circular intermediate. Bioinformatic analyses indicate that they are representative of a large reservoir of fungal Helitrons that thus far has not been characterized