Multiple cryo-electron microscopy structures of a plant ABC transporter exporting glutathione derivatives captured a closed conformation proposed to enforce the export directionality, while a complex central to the coupling mechanism containing both glutathione and closed nucleotide binding domains remains elusive.
Shannon J McKie, Parth Rakesh Desai ... Keir C Neuman
Topoisomerase VI selectively catalyzes strand passage of DNA molecules juxtaposed at close to a right angle, which explains the observed chiral-dependent activity and preferential DNA decatenation versus supercoil relaxation.
An unbiased genome-wide human forward genetic screen identifies the vacuolar ATPase complex and assembly factors as regulators of HIF stability through their actions on intracellular iron metabolism.
The engagement of DNA crossings is shown to license ATP hydrolysis and DNA cleavage by topoisomerase VI, a finding with mechanistic ramifications for related GHKL ATPases and meiotic recombination machineries.
The dsDNA-dependent motor protein Rdh54 antagonizes Rad51-Rad54-mediated D-loop formation during homologous recombination and restricts the length of D-loops.
Brian A Sosa, F Esra Demircioglu ... Thomas U Schwartz
LAP1 adopts an AAA+ like fold that, while unable to bind nucleotide, can enhance ATPase activity in the neighboring TorsinA protomer in an unusual heterohexameric ring, via an arginine finger.